10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)
x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
	OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended March 31, 2018
	OR
¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
	OF THE SECURITIES EXCHANGE ACT OF 1934
	Commission File Number 1-11848

REINSURANCE GROUP OF AMERICA, INCORPORATED

(Exact name of Registrant as specified in its charter)

MISSOURI	43-1627032
(State or other jurisdiction	(IRS employer
of incorporation or organization)	identification number)

16600 Swingley Ridge Road

Chesterfield, Missouri 63017

(Address of principal executive offices)

(636) 736-7000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes x  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes x  No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer x     Accelerated filer o     Non-accelerated filer o

Smaller reporting company o     Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes o  No x

As of April 30, 2018, 64,523,063 shares of the registrant’s common stock were outstanding.

REINSURANCE GROUP OF AMERICA, INCORPORATED AND SUBSIDIARIES

TABLE OF CONTENTS

Item		Page
	PART I – FINANCIAL INFORMATION
1	Financial Statements
	Condensed Consolidated Balance Sheets (Unaudited) March 31, 2018 and December 31, 2017	3
	Condensed Consolidated Statements of Income (Unaudited) Three months ended March 31, 2018 and 2017	4
	Condensed Consolidated Statements of Comprehensive Income (Unaudited) Three months ended March 31, 2018 and 2017	5
	Condensed Consolidated Statements of Cash Flows (Unaudited) Three months ended March 31, 2018 and 2017	6
	Notes to Condensed Consolidated Financial Statements (Unaudited):	7
	1. Business and Basis of Presentation	7
	2. Earnings Per Share	7
	3. Equity	8
	4. Investments	10
	5. Derivative Instruments	20
	6. Fair Value of Assets and Liabilities	27
	7. Segment Information	34
	8. Commitments, Contingencies and Guarantees	36
	9. Income Tax	37
	10. Employee Benefit Plans	38
	11. Reinsurance	38
	12. New Accounting Standards	39
2	Management’s Discussion and Analysis of Financial Condition and Results of Operations	40
3	Quantitative and Qualitative Disclosure About Market Risk	71
4	Controls and Procedures	71
	PART II – OTHER INFORMATION
1	Legal Proceedings	72
1A	Risk Factors	73
2	Unregistered Sales of Equity Securities and Use of Proceeds	73
6	Exhibits	73
	Signatures	75
	Index to Exhibits	74

2

PART I - FINANCIAL INFORMATION

REINSURANCE GROUP OF AMERICA, INCORPORATED AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

	March 31, 2018			December 31, 2017
	(Dollars in thousands, except share data)
Assets
Fixed maturity securities available-for-sale, at fair value (amortized cost $35,913,705 and $35,281,412)	$	37,945,260		$	38,150,820
Equity securities, at fair value (cost $110,747 and $102,841)	103,983			100,152
Mortgage loans on real estate (net of allowances of $8,864 and $9,384)	4,437,994			4,400,533
Policy loans	1,346,930			1,357,624
Funds withheld at interest	6,005,892			6,083,388
Short-term investments	130,430			93,304
Other invested assets	1,512,147			1,505,332
Total investments	51,482,636			51,691,153
Cash and cash equivalents	1,510,407			1,303,524
Accrued investment income	408,338			392,721
Premiums receivable and other reinsurance balances	2,620,515			2,338,481
Reinsurance ceded receivables	810,554			782,027
Deferred policy acquisition costs	3,245,851			3,239,824
Other assets	876,522			767,088
Total assets	$	60,954,823		$	60,514,818
Liabilities and Stockholders’ Equity
Future policy benefits	$	22,645,243		$	22,363,241
Interest-sensitive contract liabilities	16,661,602			16,227,642
Other policy claims and benefits	5,361,149			4,992,074
Other reinsurance balances	483,708			488,739
Deferred income taxes	2,085,631			2,198,309
Other liabilities	1,167,596			1,102,975
Long-term debt	2,788,240			2,788,365
Collateral finance and securitization notes	753,393			783,938
Total liabilities	51,946,562			50,945,283
Commitments and contingent liabilities (See Note 8)
Stockholders’ Equity:
Preferred stock - par value $.01 per share, 10,000,000 shares authorized, no shares issued or outstanding	—			—
Common stock - par value $.01 per share, 140,000,000 shares authorized, 79,137,758 shares issued at March 31, 2018 and December 31, 2017	791			791
Additional paid-in-capital	1,880,352			1,870,906
Retained earnings	6,797,545			6,736,265
Treasury stock, at cost - 14,624,985 and 14,685,663 shares	(1,098,823		)	(1,102,058		)
Accumulated other comprehensive income	1,428,396			2,063,631
Total stockholders’ equity	9,008,261			9,569,535
Total liabilities and stockholders’ equity	$	60,954,823		$	60,514,818

See accompanying notes to condensed consolidated financial statements (unaudited).

3

REINSURANCE GROUP OF AMERICA, INCORPORATED AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

	Three months ended March 31,
	2018			2017
Revenues:	(Dollars in thousands, except per share data)
Net premiums	$	2,582,551		$	2,365,696
Investment income, net of related expenses	516,329			514,364
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	—			(17,189		)
Other investment related gains (losses), net	(470		)	77,712
Total investment related gains (losses), net	(470		)	60,523
Other revenues	75,297			68,157
Total revenues	3,173,707			3,008,740
Benefits and Expenses:
Claims and other policy benefits	2,362,101			2,106,145
Interest credited	80,449			107,684
Policy acquisition costs and other insurance expenses	356,902			379,389
Other operating expenses	191,274			158,506
Interest expense	37,454			42,402
Collateral finance and securitization expense	7,602			6,770
Total benefits and expenses	3,035,782			2,800,896
Income before income taxes	137,925			207,844
Provision for income taxes	37,695			62,332
Net income	$	100,230		$	145,512
Earnings per share:
Basic earnings per share	$	1.55		$	2.26
Diluted earnings per share	$	1.52		$	2.22
Dividends declared per share	$	0.50		$	0.41

See accompanying notes to condensed consolidated financial statements (unaudited).

4

REINSURANCE GROUP OF AMERICA, INCORPORATED AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three months ended March 31,
	2018			2017
Comprehensive income (loss)	(Dollars in thousands)
Net income	$	100,230		$	145,512
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(1,160		)	(22,213		)
Net unrealized investment gains (losses)	(633,604		)	203,115
Defined benefit pension and postretirement plan adjustments	(471		)	924
Total other comprehensive income (loss), net of tax	(635,235		)	181,826
Total comprehensive income (loss)	$	(535,005	)	$	327,338

See accompanying notes to condensed consolidated financial statements (unaudited).

5

REINSURANCE GROUP OF AMERICA, INCORPORATED AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Three months ended March 31,
	2018			2017
	(Dollars in thousands)
Cash Flows from Operating Activities:
Net income	$	100,230		$	145,512
Adjustments to reconcile net income to net cash provided by operating activities:
Change in operating assets and liabilities:
Accrued investment income	(10,484		)	(10,501		)
Premiums receivable and other reinsurance balances	(275,354		)	(54,845		)
Deferred policy acquisition costs	13,007			58,962
Reinsurance ceded receivable balances	(21,872		)	(81,046		)
Future policy benefits, other policy claims and benefits, and other reinsurance balances	466,983			396,459
Deferred income taxes	33,715			50,110
Other assets and other liabilities, net	(41,385		)	(11,101		)
Amortization of net investment premiums, discounts and other	(31,032		)	(23,471		)
Depreciation and amortization expense	10,294			6,845
Investment related (gains) losses, net	470			(60,523		)
Other, net	(20,823		)	964
Net cash provided by operating activities	223,749			417,365
Cash Flows from Investing Activities:
Sales of fixed maturity securities available-for-sale	1,898,722			1,563,956
Maturities of fixed maturity securities available-for-sale	195,549			201,515
Sales of equity securities	29,683			152,509
Principal payments on mortgage loans on real estate	102,002			88,835
Principal payments on policy loans	10,694			24,663
Purchases of fixed maturity securities available-for-sale	(1,969,899		)	(1,933,120		)
Purchases of equity securities	(2,173		)	(14,646		)
Cash invested in mortgage loans on real estate	(141,131		)	(184,575		)
Cash invested in funds withheld at interest, net	19,638			(2,753		)
Purchase of businesses, net of cash acquired of $1,733	(24,864		)	—
Purchases of property and equipment	(5,292		)	(16,893		)
Change in short-term investments	(13,026		)	23,668
Change in other invested assets	(23,353		)	(14,126		)
Net cash provided by (used in) investing activities	76,550			(110,967		)
Cash Flows from Financing Activities:
Dividends to stockholders	(32,241		)	(26,381		)
Repayment of collateral finance and securitization notes	(27,104		)	(16,908		)
Principal payments of long-term debt	(662		)	(300,636		)
Purchases of treasury stock	(2,616		)	(3,067		)
Exercise of stock options, net	1,163			1,719
Change in cash collateral for derivative positions and other arrangements	19,537			(3,628		)
Deposits on universal life and other investment type policies and contracts	83,004			202,850
Withdrawals on universal life and other investment type policies and contracts	(156,486		)	(201,784		)
Net cash used in financing activities	(115,405		)	(347,835		)
Effect of exchange rate changes on cash	21,989			18,833
Change in cash and cash equivalents	206,883			(22,604		)
Cash and cash equivalents, beginning of period	1,303,524			1,200,718
Cash and cash equivalents, end of period	$	1,510,407		$	1,178,114
Supplemental disclosures of cash flow information:
Interest paid	$	39,284		$	46,401
Income taxes paid, net of refunds	$	6,356		$	12,132
Non-cash transactions:
Transfer of invested assets	$	605,085		$	1,653
Purchase of businesses:
Assets acquired, excluding cash acquired	$	59,184		$	—
Liabilities assumed	(34,320		)	—
Net cash paid on purchase	$	24,864		$	—

See accompanying notes to condensed consolidated financial statements (unaudited).

6

REINSURANCE GROUP OF AMERICA, INCORPORATED AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements

(Unaudited)

1. Business and Basis of Presentation

Reinsurance Group of America, Incorporated (“RGA”) is an insurance holding company that was formed on December 31, 1992. The accompanying unaudited condensed consolidated financial statements of RGA and its subsidiaries (collectively, the “Company”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these condensed consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, including normal recurring adjustments necessary for a fair presentation have been included. Results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. These unaudited condensed consolidated financial statements include the accounts of RGA and its subsidiaries, and all intercompany accounts and transactions have been eliminated. These condensed consolidated statements should be read in conjunction with the Company’s 2017 Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on February 27, 2018 (the “2017 Annual Report”).

2. Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):

	Three months ended March 31,
	2018		2017
Earnings:
Net income (numerator for basic and diluted calculations)	$	100,230	$	145,512
Shares:
Weighted average outstanding shares (denominator for basic calculation)	64,490		64,353
Equivalent shares from outstanding stock options	1,382		1,318
Denominator for diluted calculation	65,872		65,671
Earnings per share:
Basic	$	1.55	$	2.26
Diluted	$	1.52	$	2.22

The calculation of common equivalent shares does not include the impact of options having a strike or conversion price that exceeds the average stock price for the earnings period, as the result would be antidilutive. The calculation of common equivalent shares also excludes the impact of outstanding performance contingent shares, as the conditions necessary for their issuance have not been satisfied as of the end of the reporting period. For the three months ended March 31, 2018, approximately 0.2 million stock options and approximately 0.2 million performance contingent shares were excluded from the calculation. For the three months ended March 31, 2017, approximately 0.2 million stock options and approximately 0.5 million performance contingent shares were excluded from the calculation.

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3. Equity

Common stock

The changes in number of common stock shares, issued, held in treasury and outstanding are as follows for the periods indicated:

	Issued	Held In Treasury		Outstanding
Balance, December 31, 2017	79,137,758	14,685,663		64,452,095
Stock-based compensation (1)	—	(60,678	)	60,678
Balance, March 31, 2018	79,137,758	14,624,985		64,512,773

	Issued	Held In Treasury		Outstanding
Balance, December 31, 2016	79,137,758	14,835,256		64,302,502
Stock-based compensation (1)	—	(86,049	)	86,049
Balance, March 31, 2017	79,137,758	14,749,207		64,388,551

(1) Represents net shares issued from treasury pursuant to the Company’s equity-based compensation programs.

Common Stock Held in Treasury

Common stock held in treasury is accounted for at average cost. Gains resulting from the reissuance of common stock held in treasury are credited to additional paid-in capital. Losses resulting from the reissuance of common stock held in treasury are charged first to additional paid-in capital to the extent the Company has previously recorded gains on treasury share transactions, then to retained earnings.

On January 26, 2017, RGA’s board of directors authorized a share repurchase program for up to $400.0 million of RGA’s outstanding common stock. The authorization was effective immediately and does not have an expiration date. During the three months ended March 31, 2018 and 2017, no common stock was repurchased by RGA under this program.

Accumulated Other Comprehensive Income (Loss)

The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the three months ended March 31, 2018 and 2017 are as follows (dollars in thousands):

	Accumulated Other Comprehensive Income (Loss), Net of Income Tax
	Accumulated Currency Translation Adjustments			Unrealized Appreciation (Depreciation) of Investments(1)			Pension and Postretirement Benefits			Total
Balance, December 31, 2017	$	(86,350	)	$	2,200,661		$	(50,680	)	$	2,063,631
Other comprehensive income (loss) before reclassifications	5,696			(827,701		)	(1,910		)	(823,915		)
Amounts reclassified to AOCI	—			21,274			1,346			22,620
Deferred income tax benefit (expense)	(6,856		)	172,823			93			166,060
Balance, March 31, 2018	$	(87,510	)	$	1,567,057		$	(51,151	)	$	1,428,396

	Accumulated Other Comprehensive Income (Loss), Net of Income Tax
	Accumulated Currency Translation Adjustments			Unrealized Appreciation (Depreciation) of Investments(1)			Pension and Postretirement Benefits			Total
Balance, December 31, 2016	$	(172,541	)	$	1,355,033		$	(43,163	)	$	1,139,329
Other comprehensive income (loss) before reclassifications	(50,735		)	283,443			(27		)	232,681
Amounts reclassified to AOCI	—			5,762			1,456			7,218
Deferred income tax benefit (expense)	28,522			(86,090		)	(505		)	(58,073		)
Balance, March 31, 2017	$	(194,754	)	$	1,558,148		$	(42,239	)	$	1,321,155

(1) Includes cash flow hedges of $20,662 and $2,619 as of March 31, 2018 and December 31, 2017, respectively, and $7,690 and $(2,496) as of March 31, 2017 and December 31, 2016, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

8

The following table presents the amounts of AOCI reclassifications for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Amount Reclassified from AOCI
	Three months ended March 31,
Details about AOCI Components	2018			2017			Affected Line Item in  Statement of Income
Net unrealized investment gains (losses):
Net unrealized gains (losses) on available-for-sale securities	$	(14,456	)	$	(11,857	)	Investment related gains (losses), net
Cash flow hedges - Interest rate	(370		)	—			(1)
Cash flow hedges - Currency/Interest rate	144			197			(1)
Cash flow hedges - Forward bond purchase commitments	—			50			(1)
Deferred policy acquisition costs attributed to unrealized gains and losses	(6,592		)	5,848			(2)
Total	(21,274		)	(5,762		)
Provision for income taxes	4,678			3,194
Net unrealized gains (losses), net of tax	$	(16,596	)	$	(2,568	)
Amortization of defined benefit plan items:
Prior service cost (credit)	$	246		$	82		(3)
Actuarial gains/(losses)	(1,592		)	(1,538		)	(3)
Total	(1,346		)	(1,456		)
Provision for income taxes	283			510
Amortization of defined benefit plans, net of tax	$	(1,063	)	$	(946	)
Total reclassifications for the period	$	(17,659	)	$	(3,514	)

(1) See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

(2) This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2017 Annual Report for additional details.

(3) This AOCI component is included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional details.

Equity Based Compensation

Equity compensation expense was $9.7 million and $9.6 million for the three months ended March 31, 2018 and 2017, respectively. In the first quarter of 2018, the Company granted 0.2 million stock appreciation rights at $150.87 weighted average exercise price per share and 0.1 million performance contingent units to employees. Additionally, non-employee directors were granted a total of 7,263 shares of common stock. As of March 31, 2018, 1.7 million share options at a weighted average strike price per share of $68.51 were vested and exercisable, with a remaining weighted average exercise period of 4.9 years.

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4. Investments

Fixed Maturity and Equity Securities Available-for-Sale

The Company holds various types of fixed maturity securities available-for-sale and classifies them as corporate securities (“Corporate”), Canadian and Canadian provincial government securities (“Canadian government”), residential mortgage-backed securities (“RMBS”), asset-backed securities (“ABS”), commercial mortgage-backed securities (“CMBS”), U.S. government and agencies (“U.S. government”), state and political subdivisions, and other foreign government, supranational and foreign government-sponsored enterprises (“Other foreign government”).

The following table provides information relating to investments in fixed maturity securities by sector as of March 31, 2018 (dollars in thousands):

March 31, 2018:	Amortized		Unrealized		Unrealized		Estimated Fair		% of		Other-than- temporary impairments
	Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
Corporate	$	22,890,985	$	869,867	$	240,383	$	23,520,469	61.9	%	$	—
Canadian government	2,803,077		1,297,817		3,040		4,097,854		10.8		—
RMBS	1,791,007		23,640		27,499		1,787,148		4.7		—
ABS	1,727,810		16,383		9,471		1,734,722		4.6		275
CMBS	1,281,452		12,717		12,236		1,281,933		3.4		—
U.S. government	1,486,262		9,266		59,414		1,436,114		3.8		—
State and political subdivisions	672,064		49,465		8,016		713,513		1.9		—
Other foreign government	3,261,048		133,865		21,406		3,373,507		8.9		—
Total fixed maturity securities	$	35,913,705	$	2,413,020	$	381,465	$	37,945,260	100.0	%	$	275

The following table provides information relating to investments in fixed maturity and equity securities by sector as of December 31, 2017 (dollars in thousands):

December 31, 2017:	Amortized		Unrealized		Unrealized		Estimated Fair		% of		Other-than- temporary impairments
	Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
Corporate	$	21,966,803	$	1,299,594	$	55,429	$	23,210,968	60.9	%	$	—
Canadian government	2,843,273		1,378,510		1,707		4,220,076		11.1		—
RMBS	1,695,126		36,632		11,878		1,719,880		4.5		—
ABS	1,634,758		18,798		5,194		1,648,362		4.3		275
CMBS	1,285,594		22,627		4,834		1,303,387		3.4		—
U.S. government	1,953,436		12,089		21,933		1,943,592		5.1		—
State and political subdivisions	647,727		59,997		4,296		703,428		1.8		—
Other foreign government	3,254,695		154,507		8,075		3,401,127		8.9		—
Total fixed maturity securities	$	35,281,412	$	2,982,754	$	113,346	$	38,150,820	100.0	%	$	275
Non-redeemable preferred stock	$	41,553	$	479	$	2,226	$	39,806	39.7	%
Other equity securities	61,288		479		1,421		60,346		60.3
Total equity securities	$	102,841	$	958	$	3,647	$	100,152	100.0	%

The Company enters into various collateral arrangements with counterparties that require both the pledging and acceptance of fixed maturity securities as collateral. Pledged fixed maturity securities are included in fixed maturity securities, available-for-sale in the condensed consolidated balance sheets. Fixed maturity securities received as collateral are held in separate custodial accounts and are not recorded on the Company’s condensed consolidated balance sheets. Subject to certain constraints, the Company is permitted by contract to sell or repledge collateral it receives; however, as of March 31, 2018 and December 31, 2017, none of the collateral received had been sold or repledged. The Company also holds assets in trust to satisfy collateral requirements under derivative transactions and certain third-party reinsurance treaties. The following table includes fixed maturity securities pledged and received as collateral and assets in trust held to satisfy collateral requirements under derivative transactions and certain third-party reinsurance treaties as of March 31, 2018 and December 31, 2017 (dollars in thousands):

10

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Fixed maturity securities pledged as collateral	$	72,850	$	75,384	$	72,542	$	75,622
Fixed maturity securities received as collateral	n/a		614,423		n/a		590,417
Assets in trust held to satisfy collateral requirements	16,316,662		17,076,547		15,584,296		16,715,281

The Company monitors its concentrations of financial instruments on an ongoing basis and mitigates credit risk by maintaining a diversified investment portfolio which limits exposure to any one issuer. The Company’s exposure to concentrations of credit risk from single issuers greater than 10% of the Company’s stockholders’ equity included securities of the U.S. government and its agencies as well as the securities disclosed below as of March 31, 2018 and December 31, 2017 (dollars in thousands).

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Fixed maturity securities guaranteed or issued by:
Canadian province of Quebec	$	1,106,753	$	1,863,568	$	1,119,337	$	1,917,996
Canadian province of Ontario	928,384		1,247,158		939,837		1,282,944

The amortized cost and estimated fair value of fixed maturity securities classified as available-for-sale at March 31, 2018 are shown by contractual maturity in the table below (dollars in thousands). Actual maturities can differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date.

	Amortized Cost		Estimated Fair Value
Available-for-sale:
Due in one year or less	$	900,166	$	905,385
Due after one year through five years	7,939,821		8,084,053
Due after five years through ten years	9,533,025		9,779,934
Due after ten years	12,740,424		14,372,085
Asset and mortgage-backed securities	4,800,269		4,803,803
Total	$	35,913,705	$	37,945,260

Corporate Fixed Maturity Securities

The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of March 31, 2018 and December 31, 2017 (dollars in thousands):

March 31, 2018:			Estimated
	Amortized Cost		Fair Value		% of Total
Finance	$	8,250,681	$	8,407,037	35.8	%
Industrial	12,093,034		12,437,180		52.8
Utility	2,547,270		2,676,252		11.4
Total	$	22,890,985	$	23,520,469	100.0	%
December 31, 2017:			Estimated
	Amortized Cost		Fair Value		% of Total
Finance	$	7,977,885	$	8,362,774	36.1	%
Industrial	11,535,166		12,199,333		52.5
Utility	2,453,752		2,648,861		11.4
Total	$	21,966,803	$	23,210,968	100.0	%

11

Other-Than-Temporary Impairments - Fixed Maturity Securities

As discussed in Note 2 – “Summary of Significant Accounting Policies” of the 2017 Annual Report, a portion of certain other-than-temporary impairment (“OTTI”) losses on fixed maturity securities is recognized in AOCI. For these securities, the net amount recognized in the condensed consolidated statements of income (“credit loss impairments”) represents the difference between the amortized cost of the security and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security prior to impairment. Any remaining difference between the fair value and amortized cost is recognized in AOCI. The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts (dollars in thousands):

	Three months ended March 31,
	2018		2017
Balance, beginning of period	$	3,677	$	6,013
Credit loss OTTI previously recognized on securities impaired to fair value during the period	—		(2,336		)
Balance, end of period	$	3,677	$	3,677

Unrealized Losses for Fixed Maturity and Equity Securities Available-for-Sale

The following table presents the total gross unrealized losses for the 2,114 fixed maturity securities as of March 31, 2018, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

	March 31, 2018
	Gross Unrealized Losses		% of Total
Less than 20%	$	358,873	94.1	%
20% or more for less than six months	20,232		5.3
20% or more for six months or greater	2,360		0.6
Total	$	381,465	100.0	%

The following table presents the total gross unrealized losses for the 1,116 fixed maturity and equity securities at December 31, 2017 where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

	December 31, 2017
	Gross Unrealized Losses		% of Total
Less than 20%	$	113,466	97.0	%
20% or more for less than six months	689		0.6
20% or more for six months or greater	2,838		2.4
Total	$	116,993	100.0	%

The Company’s determination of whether a decline in value is other-than-temporary includes analysis of the underlying credit and the extent and duration of a decline in value. The Company’s credit analysis of an investment includes determining whether the issuer is current on its contractual payments, evaluating whether it is probable that the Company will be able to collect all amounts due according to the contractual terms of the security and analyzing the overall ability of the Company to recover the amortized cost of the investment.

The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 2,114 fixed maturity securities that have estimated fair values below amortized cost as of March 31, 2018 (dollars in thousands). These investments are presented by class and grade of security, as well as the length of time the related fair value has remained below amortized cost.

12

	Less than 12 months				12 months or greater				Total
			Gross				Gross				Gross
March 31, 2018:	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
Corporate	$	7,282,079	$	155,541	$	883,699	$	46,908	$	8,165,778	$	202,449
Canadian government	39,192		390		109,552		2,536		148,744		2,926
RMBS	897,255		19,899		225,288		7,575		1,122,543		27,474
ABS	612,053		7,001		114,605		2,423		726,658		9,424
CMBS	538,464		8,026		103,447		4,210		641,911		12,236
U.S. government	488,095		16,856		744,844		42,558		1,232,939		59,414
State and political subdivisions	135,158		3,331		67,949		4,685		203,107		8,016
Other foreign government	746,485		15,575		191,446		5,000		937,931		20,575
Total investment grade securities	10,738,781		226,619		2,440,830		115,895		13,179,611		342,514
Below investment grade securities:
Corporate	452,086		29,597		46,976		8,337		499,062		37,934
Canadian government	1,900		114		—		—		1,900		114
RMBS	—		—		1,272		25		1,272		25
ABS	—		—		1,173		47		1,173		47
Other foreign government	57,385		662		12,045		169		69,430		831
Total below investment grade securities	511,371		30,373		61,466		8,578		572,837		38,951
Total fixed maturity securities	$	11,250,152	$	256,992	$	2,502,296	$	124,473	$	13,752,448	$	381,465

The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 1,116 fixed maturity and equity securities that have estimated fair values below amortized cost as of December 31, 2017 (dollars in thousands):

	Less than 12 months				12 months or greater				Total
			Gross				Gross				Gross
December 31, 2017:	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
Corporate	$	1,886,212	$	17,099	$	1,009,750	$	28,080	$	2,895,962	$	45,179
Canadian government	18,688		91		111,560		1,596		130,248		1,687
RMBS	566,699		5,852		224,439		6,004		791,138		11,856
ABS	434,274		2,707		168,524		2,434		602,798		5,141
CMBS	220,401		1,914		103,269		2,920		323,670		4,834
U.S. government	800,298		6,177		767,197		15,756		1,567,495		21,933
State and political subdivisions	43,510		242		68,666		4,054		112,176		4,296
Other foreign government	369,717		2,707		191,265		4,704		560,982		7,411
Total investment grade securities	4,339,799		36,789		2,644,670		65,548		6,984,469		102,337
Below investment grade securities:
Corporate	194,879		3,317		75,731		6,933		270,610		10,250
Canadian government	1,995		20		—		—		1,995		20
RMBS	—		—		1,369		22		1,369		22
ABS	—		—		1,489		53		1,489		53
Other foreign government	28,600		113		15,134		551		43,734		664
Total below investment grade securities	225,474		3,450		93,723		7,559		319,197		11,009
Total fixed maturity securities	$	4,565,273	$	40,239	$	2,738,393	$	73,107	$	7,303,666	$	113,346
Non-redeemable preferred stock	$	82	$	1	$	26,471	$	2,225	$	26,553	$	2,226
Other equity securities	5,820		1,023		47,251		398		53,071		1,421
Total equity securities	$	5,902	$	1,024	$	73,722	$	2,623	$	79,624	$	3,647

13

The Company has no intention to sell, nor does it expect to be required to sell, the securities outlined in the table above, as of the dates indicated. However, unforeseen facts and circumstances may cause the Company to sell fixed maturity securities in the ordinary course of managing its portfolio to meet certain diversification, credit quality and liquidity guidelines.

Unrealized losses on below investment grade securities as of March 31, 2018 are primarily related to high-yield corporate securities. Changes in unrealized losses are primarily being driven by changes in interest rates.

Investment Income, Net of Related Expenses

Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):

	Three months ended March 31,
	2018			2017
Fixed maturity securities available-for-sale	$	369,203		$	324,500
Equity securities	1,682			1,359
Mortgage loans on real estate	50,199			44,347
Policy loans	14,780			15,272
Funds withheld at interest	75,445			127,578
Short-term investments and cash and cash equivalents	3,245			1,510
Other	23,828			18,468
Investment income	538,382			533,034
Investment expense	(22,053		)	(18,670		)
Investment income, net of related expenses	$	516,329		$	514,364

Investment Related Gains (Losses), Net

Investment related gains (losses), net consist of the following (dollars in thousands):

	Three months ended March 31,
	2018			2017
Fixed maturity securities available for sale:
Other-than-temporary impairment losses on fixed maturity securities recognized in earnings	$	—		$	(17,189	)
Gain on investment activity	10,966			17,893
Loss on investment activity	(20,380		)	(8,687		)
Equity securities:
Gain on investment activity	28			—
Loss on investment activity	(950		)	(3,876		)
Change in unrealized gains (losses) recognized in earnings	(4,137		)	—
Other impairment losses and change in mortgage loan provision	(312		)	(99		)
Derivatives and other, net	14,315			72,481
Total investment related gains (losses), net	$	(470	)	$	60,523

There were no fixed maturity impairments for the three months ended March 31, 2018. The fixed maturity impairments for the three months ended March 31, 2017 were largely related to high-yield corporate securities. The other impairment losses and change in mortgage loan provision for the three months ended March 31, 2018 were primarily due to impairments on real estate joint ventures offset by a release of the mortgage loan valuation allowance. The other impairment losses and change in mortgage loan provision for the three months ended March 31, 2017 were primarily due to an increase in the mortgage loan valuation allowance. The fluctuations in investment related gains (losses) for derivatives and other for the three months ended March 31, 2018, compared to the same period in 2017, are primarily due to changes in the fair value of embedded derivatives and interest rate swaps.

During the three months ended March 31, 2018 and 2017, the Company sold fixed maturity securities with fair values of $1,263.6 million and $428.6 million at losses of $20.4 million and $8.7 million, respectively. During the three months ended March 31, 2018 and 2017, the Company sold equity securities with fair values of $28.4 million and $147.6 million at losses of $1.0 million and $3.9 million, respectively. The Company generally does not buy and sell securities on a short-term basis.

14

Securities Borrowing, Lending and Other

The following table includes the amount of borrowed securities, securities lent and securities collateral received as part of the securities lending program and repurchased/reverse repurchased securities pledged and received as of March 31, 2018 and December 31, 2017 (dollars in thousands).

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Borrowed securities	$	353,875	$	370,760	$	358,875	$	377,820
Securities lending:
Securities loaned	117,449		118,617		117,246		121,551
Securities received	n/a		128,000		n/a		128,000
Repurchase program/reverse repurchase program:
Securities pledged	403,135		411,988		413,819		428,344
Securities received	n/a		404,871		n/a		417,550

The Company also held cash collateral for repurchase program/reverse repurchase programs of $30.7 million and $31.2 million at March 31, 2018 and December 31, 2017, respectively. No cash or securities have been pledged by the Company for its securities borrowing program as of March 31, 2018 and December 31, 2017.

The following table presents information on the Company’s securities lending and repurchase transactions as of March 31, 2018 and December 31, 2017 (dollars in thousands). Collateral associated with certain borrowed securities is not included within the table, as the collateral pledged to each counterparty is the right to reinsurance treaty cash flows.

	March 31, 2018
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater than 90 Days		Total
Securities lending transactions:
Corporate	$	—	$	—	$	—	$	118,617	$	118,617
Total	$	—	$	—	$	—	$	118,617	$	118,617
Repurchase transactions:
Corporate	$	—	$	—	$	—	$	171,678	$	171,678
RMBS	—		—		—		—		—
U.S. government	—		—		—		219,509		219,509
Foreign government	—		—		—		19,670		19,670
Other	1,131		—		—		—		1,131
Total	1,131		—		—		410,857		411,988
Total borrowings	$	1,131	$	—	$	—	$	529,474	$	530,605
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table									$	563,587
Amounts related to agreements not included in offsetting disclosure									$	32,982

15

	December 31, 2017
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater than 90 Days		Total
Securities lending transactions:
Corporate	$	—	$	—	$	—	$	121,551	$	121,551
Total	$	—	$	—	$	—	$	121,551	$	121,551
Repurchase transactions:
Corporate	$	—	$	—	$	312	$	184,334	$	184,646
RMBS	—		—		—		—		—
U.S. government	—		—		—		220,765		220,765
Foreign government	—		—		—		21,802		21,802
Other	1,131		—		—		—		1,131
Total	1,131		—		312		426,901		428,344
Total borrowings	$	1,131	$	—	$	312	$	548,452	$	549,895
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table									$	576,786
Amounts related to agreements not included in offsetting disclosure									$	26,891

The Company has elected to offset amounts recognized as receivables and payables resulting from the repurchase/reverse repurchase programs. After the effect of offsetting, the net amount presented on the condensed consolidated balance sheets was a liability of $0.4 million and $1.1 million as of March 31, 2018 and December 31, 2017, respectively. As of March 31, 2018 and December 31, 2017, the Company recognized payables resulting from cash received as collateral associated with a repurchase agreement, as discussed above. Amounts owed to and due from the counterparties may be settled in cash or offset, in accordance with the agreements.

Mortgage Loans on Real Estate

Mortgage loans represented approximately 8.6% and 8.5% of the Company’s total investments as of March 31, 2018 and December 31, 2017. As of March 31, 2018, mortgage loans were geographically dispersed throughout the U.S. with the largest concentrations in California (19.6%), Texas (8.6%) and Georgia (7.5%) and include loans secured by properties in Canada (2.4%). The recorded investment in mortgage loans on real estate presented below is gross of unamortized deferred loan origination fees and expenses, and valuation allowances.

The distribution of mortgage loans by property type is as follows as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018					December 31, 2017
Property type:	Carrying Value			% of Total		Carrying Value			% of Total
Office building	$	1,518,170		34.1	%	$	1,487,392		33.6	%
Retail	1,236,933			27.8		1,270,676			28.8
Industrial	964,685			21.7		938,612			21.3
Apartment	497,699			11.2		510,052			11.6
Other commercial	232,804			5.2		206,439			4.7
Recorded investment	4,450,291			100.0	%	$	4,413,171		100.0	%
Unamortized balance of loan origination fees and expenses	(3,433		)			(3,254		)
Valuation allowances	(8,864		)			(9,384		)
Total mortgage loans on real estate	$	4,437,994				$	4,400,533

16

The maturities of the mortgage loans as of March 31, 2018 and December 31, 2017 are as follows (dollars in thousands):

	March 31, 2018				December 31, 2017
	Recorded Investment		% of Total		Recorded Investment		% of Total
Due within five years	$	1,130,108	25.4	%	$	1,091,066	24.8	%
Due after five years through ten years	2,492,588		56.0		2,516,872		57.0
Due after ten years	827,595		18.6		805,233		18.2
Total	$	4,450,291	100.0	%	$	4,413,171	100.0	%

The following tables set forth certain key credit quality indicators of the Company’s recorded investment in mortgage loans as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	Recorded Investment
	Debt Service Ratios						Construction loans
	>1.20x		1.00x - 1.20x		<1.00x				Total		% of Total
March 31, 2018:
Loan-to-Value Ratio
0% - 59.99%	$	2,154,344	$	79,738	$	6,855	$	12,279	$	2,253,216	50.6	%
60% - 69.99%	1,520,008		29,795		68,070		—		1,617,873		36.4
70% - 79.99%	360,183		27,682		30,904		—		418,769		9.4
Greater than 80%	125,660		30,497		4,276		—		160,433		3.6
Total	$	4,160,195	$	167,712	$	110,105	$	12,279	$	4,450,291	100.0	%

	Recorded Investment
	Debt Service Ratios						Construction loans
	>1.20x		1.00x - 1.20x		<1.00x				Total		% of Total
December 31, 2017:
Loan-to-Value Ratio
0% - 59.99%	$	2,148,428	$	53,979	$	3,801	$	—	$	2,206,208	50.0	%
60% - 69.99%	1,517,029		47,128		43,921		—		1,608,078		36.4
70% - 79.99%	396,446		19,461		15,367		—		431,274		9.8
Greater than 80%	120,850		30,713		6,362		9,686		167,611		3.8
Total	$	4,182,753	$	151,281	$	69,451	$	9,686	$	4,413,171	100.0	%

The age analysis of the Company’s past due recorded investments in mortgage loans as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018		December 31, 2017
31-60 days past due	$	17,102	$	17,100
61-90 days past due	—		2,056
Greater than 90 days	2,056		—
Total past due	19,158		19,156
Current	4,431,133		4,394,015
Total	$	4,450,291	$	4,413,171

17

The following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018		December 31, 2017
Mortgage loans:
Individually measured for impairment	$	23,423	$	5,858
Collectively measured for impairment	4,426,868		4,407,313
Recorded investment	$	4,450,291	$	4,413,171
Valuation allowances:
Individually measured for impairment	$	—	$	—
Collectively measured for impairment	8,864		9,384
Total valuation allowances	$	8,864	$	9,384

Information regarding the Company’s loan valuation allowances for mortgage loans for the three months ended March 31, 2018 and 2017 is as follows (dollars in thousands):

	Three months ended March 31,
	2018			2017
Balance, beginning of period	$	9,384		$	7,685
Provision (release)	(516		)	101
Translation adjustment	(4		)	—
Balance, end of period	$	8,864		$	7,786

Information regarding the portion of the Company’s mortgage loans that were impaired as of March 31, 2018 and December 31, 2017 is as follows (dollars in thousands):

	Unpaid Principal Balance		Recorded Investment		Related Allowance		Carrying Value
March 31, 2018:
Impaired mortgage loans with no valuation allowance recorded	$	—	$	23,423	$	—	$	23,423
Impaired mortgage loans with valuation allowance recorded	—		—		—		—
Total impaired mortgage loans	$	—	$	23,423	$	—	$	23,423
December 31, 2017:
Impaired mortgage loans with no valuation allowance recorded	$	6,427	$	5,858	$	—	$	5,858
Impaired mortgage loans with valuation allowance recorded	—		—		—		—
Total impaired mortgage loans	$	6,427	$	5,858	$	—	$	5,858
The Company’s average investment balance of impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands):
	Three months ended March 31,
	2018				2017
	Average Recorded Investment(1)		Interest Income		Average Recorded Investment(1)		Interest Income
Impaired mortgage loans with no valuation allowance recorded	$	14,640	$	56	$	2,157	$	33
Impaired mortgage loans with valuation allowance recorded	—		—		—		—
Total impaired mortgage loans	$	14,640	$	56	$	2,157	$	33

(1) Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

The Company did not acquire any impaired mortgage loans during the three months ended March 31, 2018 and 2017. The Company had no mortgage loans that were on a nonaccrual status as of March 31, 2018 and December 31, 2017.

18

Policy Loans

Policy loans comprised approximately 2.6% of the Company’s total investments as of March 31, 2018 and December 31, 2017, the majority of which are associated with one client. These policy loans present no credit risk because the amount of the loan cannot exceed the obligation due to the ceding company upon the death of the insured or surrender of the underlying policy. The provisions of the treaties in force and the underlying policies determine the policy loan interest rates. The Company earns a spread between the interest rate earned on policy loans and the interest rate credited to corresponding liabilities.

Funds Withheld at Interest

Funds withheld at interest comprised approximately 11.7% and 11.8% of the Company’s total investments as of March 31, 2018 and December 31, 2017, respectively. Of the $6.0 billion funds withheld at interest balance, net of embedded derivatives, as of March 31, 2018, $4.0 billion of the balance is associated with one client. For reinsurance agreements written on a modified coinsurance basis and certain agreements written on a coinsurance funds withheld basis, assets equal to the net statutory reserves are withheld and legally owned and managed by the ceding company and are reflected as funds withheld at interest on the Company’s condensed consolidated balance sheets. In the event of a ceding company’s insolvency, the Company would need to assert a claim on the assets supporting its reserve liabilities. However, the risk of loss to the Company is mitigated by its ability to offset amounts it owes the ceding company for claims or allowances against amounts owed to the Company from the ceding company.

Other Invested Assets

Other invested assets include limited partnership interests, joint ventures (other than operating joint ventures), equity release mortgages, derivative contracts and fair value option (“FVO”) contractholder-directed unit-linked investments. Other invested assets also include FHLB common stock, which is included in other in the table below. Other invested assets represented approximately 2.9% of the Company’s total investments as of March 31, 2018 and December 31, 2017. Carrying values of these assets as of March 31, 2018 and December 31, 2017 are as follows (dollars in thousands):

	March 31, 2018		December 31, 2017
Limited partnership interests and real estate joint ventures	805,613		781,124
Equity release mortgages	261,837		219,940
Derivatives	132,195		137,613
FVO contractholder-directed unit-linked investments	221,512		218,541
Other	90,990		148,114
Total other invested assets	$	1,512,147	$	1,505,332

19

5.    Derivative Instruments

Derivatives, except for embedded derivatives and longevity and mortality swaps, are carried on the Company’s condensed consolidated balance sheets in other invested assets or other liabilities, at fair value. Longevity and mortality swaps are included on the condensed consolidated balance sheets in other assets or other liabilities, at fair value. Embedded derivative assets and liabilities on modified coinsurance or funds withheld arrangements are included on the condensed consolidated balance sheets with the host contract in funds withheld at interest, at fair value. Embedded derivative liabilities on indexed annuity and variable annuity products are included on the condensed consolidated balance sheets with the host contract in interest-sensitive contract liabilities, at fair value. The following table presents the notional amounts and gross fair value of derivative instruments prior to taking into account the netting effects of master netting agreements as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018							December 31, 2017
	Notional		Carrying Value/Fair Value					Notional		Carrying Value/Fair Value
	Amount		Assets			Liabilities		Amount		Assets		Liabilities
Derivatives not designated as hedging instruments:
Interest rate swaps	$	1,021,739	$	47,303		$	152	$	996,204	$	59,809	$	2,372
Financial futures	388,874		—			—		412,438		—		—
Foreign currency forwards	6,012		48			4		6,030		—		28
Consumer price index swaps	218,237		127			427		221,932		—		2,160
Credit default swaps	933,200		7,279			1,058		961,200		8,319		1,651
Equity options	639,801		33,958			—		632,251		23,271		—
Longevity swaps	985,920		44,011			—		960,400		40,659		—
Mortality swaps	—		—			1,683		—		—		1,683
Synthetic guaranteed investment contracts	10,866,171		—			—		10,052,576		—		—
Embedded derivatives in:
Modified coinsurance or funds withheld arrangements	—		135,805			—		—		122,194		—
Indexed annuity products	—		—			827,109		—		—		861,758
Variable annuity products	—		—			137,686		—		—		152,470
Total non-hedging derivatives	15,059,954		268,531			968,119		14,243,031		254,252		1,022,122
Derivatives designated as hedging instruments:
Interest rate swaps	435,000		(1,119		)	16,972		435,000		—		20,389
Foreign currency swaps	598,575		56,403			5,461		672,921		65,207		8,496
Foreign currency forwards	698,241		7,458			225		553,175		1,265		7,720
Total hedging derivatives	1,731,816		62,742			22,658		1,661,096		66,472		36,605
Total derivatives	$	16,791,770	$	331,273		$	990,777	$	15,904,127	$	320,724	$	1,058,727

Netting Arrangements

Certain of the Company’s derivatives are subject to enforceable master netting arrangements and reported as a net asset or liability in the condensed consolidated balance sheets. The Company nets all derivatives that are subject to such arrangements.

The Company has elected to include all derivatives, except embedded derivatives, in the tables below, irrespective of whether they are subject to an enforceable master netting arrangement or a similar agreement. See Note 4 – “Investments” for information regarding the Company’s securities borrowing, lending, repurchase and repurchase/reverse repurchase programs. See “Embedded Derivatives” below for information regarding the Company’s bifurcated embedded derivatives.

20

The following table provides information relating to the Company’s derivative instruments as of March 31, 2018 and December 31, 2017 (dollars in thousands):

								Gross Amounts Not Offset in the Balance Sheet
	Gross Amounts    Recognized		Gross Amounts Offset in the Balance Sheet			Net Amounts Presented in the Balance Sheet		Financial Instruments (1)			Cash Collateral    Pledged/ Received			Net Amount
March 31, 2018:
Derivative assets	$	195,468	$	(19,262	)	$	176,206	$	—		$	(188,407	)	$	(12,201	)
Derivative liabilities	25,982		(19,262		)	6,720		(57,456		)	(3,470		)	(54,206		)
December 31, 2017:
Derivative assets	$	198,530	$	(20,258	)	$	178,272	$	(862	)	$	(185,900	)	$	(8,490	)
Derivative liabilities	44,499		(20,258		)	24,241		(58,156		)	(22,221		)	(56,136		)

(1) Includes initial margin posted to a central clearing partner.

Accounting for Derivative Instruments and Hedging Activities

The Company does not enter into derivative instruments for speculative purposes. As discussed below under “Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging,” the Company uses various derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment. As of March 31, 2018 and December 31, 2017, the Company held interest rate swaps that were designated and qualified as cash flow hedges of interest rate risk, for variable rate liabilities and foreign currency assets, foreign currency swaps and foreign currency forwards that were designated and qualified as hedges of a portion of its net investment in its foreign operations, foreign currency swaps that were designated and qualified as fair value hedges of foreign currency risk, and derivative instruments that were not designated as hedging instruments. See Note 2 – “Summary of Significant Accounting Policies” of the Company’s 2017 Annual Report for a detailed discussion of the accounting treatment for derivative instruments, including embedded derivatives. Derivative instruments are carried at fair value and generally require an insignificant amount of cash at inception of the contracts.

Fair Value Hedges

The Company designates and reports certain foreign currency swaps to hedge the foreign currency fair value exposure of foreign currency denominated assets as fair value hedges when they meet the requirements of the general accounting principles for Derivatives and Hedging. The gain or loss on the hedged item attributable to a change in foreign currency and the offsetting gain or loss on the related foreign currency swaps as of March 31, 2018 and 2017, were (dollars in thousands):

Type of Fair Value Hedge	Hedged Item	Gains (Losses) Recognized for Derivatives			Gains (Losses) Recognized for Hedged Items			Ineffectiveness Recognized in Investment Related Gains (Losses)
For the three months ended March 31, 2018:
Foreign currency swaps	Foreign-denominated fixed maturity securities	$	(1,891	)	$	1,891		$	—
For the three months ended March 31, 2017:
Foreign currency swaps	Foreign-denominated fixed maturity securities	$	6,536		$	(6,536	)	$	—

A regression analysis was used, both at inception of the hedge and on an ongoing basis, to determine whether each derivative used in a hedged transaction is highly effective in offsetting changes in the hedged item. For the foreign currency swaps, the change in fair value related to changes in the benchmark interest rate and credit spreads are excluded from the hedge effectiveness. For the three months ended March 31, 2018 and 2017, $2.4 million and $1.0 million, respectively, of the change in the estimated fair value of derivatives, was excluded from hedge effectiveness.

Cash Flow Hedges

Certain derivative instruments are designated as cash flow hedges when they meet the requirements of the general accounting principles for Derivatives and Hedging. The Company designates and accounts for the following as cash flows: (i) certain interest rate swaps, in which the cash flows of liabilities are variable based on a benchmark rate; (ii) certain interest rate swaps, in which the cash flows of assets are denominated in different currencies, commonly referred to as cross-currency swaps; and (iii) forward bond purchase commitments.

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The following table presents the components of AOCI, before income tax, and the condensed consolidated income statement classification where the gain or loss is recognized related to cash flow hedges for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Three months ended March 31,
	2018			2017
Balance beginning of period	$	2,619		$	(2,496	)
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges	17,817			10,433
Amounts reclassified to investment income	(144		)	(247		)
Amounts reclassified to interest expense	370			—
Balance end of period	$	20,662		$	7,690

As of March 31, 2018, the before-tax deferred net gains (losses) on derivative instruments recorded in AOCI that are expected to be reclassified to earnings during the next twelve months are approximately $0.6 million and $0.7 million in investment income and interest expense, respectively.

The following table presents the effective portion of derivatives in cash flow hedging relationships on the condensed consolidated statements of income and the condensed consolidated statements of comprehensive income for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Effective Portion
Derivative Type	Gain (Loss) Deferred in OCI		Gain (Loss) Reclassified into Income from OCI
			Investment Income		Interest Expense
For the three months ended March 31, 2018:
Interest rate	$	14,986	$	—	$	(370	)
Currency/Interest rate	2,831		144		—
Forward bond purchase commitments	—		—		—
Total	$	17,817	$	144	$	(370	)
For the three months ended March 31, 2017:
Interest rate	$	2,216	$	—	$	—
Currency/Interest rate	8,217		197		—
Forward bond purchase commitments	—		50		—
Total	$	10,433	$	247	$	—

All components of each derivative’s gain or loss were included in the assessment of hedge effectiveness. For the three months ended March 31, 2018 and 2017, the ineffective portion of derivatives reported as cash flow hedges was not material to the Company’s results of operations. Also, there were no material amounts reclassified into earnings relating to instances in which the Company discontinued cash flow hedge accounting because the forecasted transaction did not occur by the anticipated date or within the additional time period permitted by the authoritative guidance for the accounting for derivatives and hedging.

Hedges of Net Investments in Foreign Operations

The Company uses foreign currency swaps and foreign currency forwards to hedge a portion of its net investment in certain foreign operations against adverse movements in exchange rates. The following table illustrates the Company’s net investments in foreign operations (“NIFO”) hedges for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Derivative Gains (Losses) Deferred in AOCI
	For the three months ended March 31,
Type of NIFO Hedge (1) (2)	2018		2017
Foreign currency swaps	$	8,805	$	(7,606	)
Foreign currency forwards	12,236		—

(1) There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.

(2) There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.

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The cumulative foreign currency translation gain recorded in AOCI related to these hedges was $134.7 million and $113.7 million at March 31, 2018 and December 31, 2017, respectively. If a hedged foreign operation was sold or substantially liquidated, the amounts in AOCI would be reclassified to the condensed consolidated statements of income. A pro rata portion would be reclassified upon partial sale of a hedged foreign operation.

Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging

The Company uses various other derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment. The gain or loss related to the change in fair value for these derivative instruments is recognized in investment related gains (losses), net in the condensed consolidated statements of income, except where otherwise noted.

A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s condensed consolidated statements of income for the three months ended March 31, 2018 and 2017 is as follows (dollars in thousands):

		Gain (Loss) for the three months ended         March 31,
Type of Non-hedging Derivative	Income Statement Location of Gain (Loss)	2018			2017
Interest rate swaps	Investment related gains (losses), net	$	(26,571	)	$	(2,612	)
Financial futures	Investment related gains (losses), net	129			(12,775		)
Foreign currency forwards	Investment related gains (losses), net	323			904
CPI swaps	Investment related gains (losses), net	2,186			(5		)
Credit default swaps	Investment related gains (losses), net	(402		)	7,358
Equity options	Investment related gains (losses), net	2,593			(17,189		)
Longevity swaps	Other revenues	2,267			1,865
Mortality swaps	Other revenues	—			(395		)
Subtotal		(19,475		)	(22,849		)
Embedded derivatives in:
Modified coinsurance or funds withheld arrangements	Investment related gains (losses), net	13,611			68,702
Indexed annuity products	Interest credited	25,351			(16,402		)
Variable annuity products	Investment related gains (losses), net	14,785			22,363
Total non-hedging derivatives		$	34,272		$	51,814

Types of Derivatives Used by the Company

Interest Rate Swaps

Interest rate swaps are used by the Company primarily to reduce market risks from changes in interest rates, to alter interest rate exposure arising from mismatches between assets and liabilities (duration mismatches) and to manage the risk of cash flows of liabilities that are variable based on a benchmark rate. With an interest rate swap, the Company agrees with another party to exchange, at specified intervals, the difference between two rates, which can be either fixed-rate or floating-rate interest amounts, tied to an agreed-upon notional principal amount. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments at each due date. The Company utilizes interest rate swaps in cash flow and non-qualifying hedging relationships.

Financial Futures

Exchange-traded futures are used primarily to economically hedge liabilities embedded in certain variable annuity products. With exchange-traded futures transactions, the Company agrees to purchase or sell a specified number of contracts, the value of which is determined by the relevant indices, and to post variation margin on a daily basis in an amount equal to the difference between the daily estimated fair values of those contracts. The Company enters into exchange-traded futures with regulated futures commission merchants that are members of the exchange.

Equity Options

Equity index options are used by the Company primarily to hedge minimum guarantees embedded in certain variable annuity products. To hedge against adverse changes in equity indices volatility, the Company buys put options. The contracts are net settled in cash based on differentials in the indices at the time of exercise and the strike price.

23

Consumer Price Index Swaps

Consumer price index (“CPI”) swaps are used by the Company primarily to economically hedge liabilities embedded in certain insurance products where value is directly affected by changes in a designated benchmark consumer price index. With a CPI swap transaction, the Company agrees with another party to exchange the actual amount of inflation realized over a specified period of time for a fixed amount of inflation determined at inception. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments to be made by the counterparty at each due date. Most of these swaps will require a single payment to be made by one counterparty at the maturity date of the swap.

Foreign Currency Swaps

Foreign currency swaps are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency swap transaction, the Company agrees with another party to exchange, at specified intervals, the difference between one currency and another at a forward exchange rate calculated by reference to an agreed upon principal amount. The principal amount of each currency is exchanged at the termination of the currency swap by each party. The Company uses foreign currency swaps in hedges of net investments in foreign operations, fair value hedges and non-qualifying hedge relationships.

Foreign Currency Forwards

Foreign currency forwards are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency forward transaction, the Company agrees with another party to deliver a specified amount of an identified currency at a specified future date. The price is agreed upon at the time of the contract and payment for such a contract is made in a different currency at the specified future date. The Company uses foreign currency forwards in hedges of net investments in foreign operations and non-qualifying hedge relationships.

Forward Bond Purchase Commitments

Forward bond purchase commitments have been used by the Company to hedge against the variability in the anticipated cash flows required to purchase securities. With forward bond purchase commitments, the forward price is agreed upon at the time of the contract and payment for such contract is made at the future specified settlement date of the securities.

Credit Default Swaps

The Company sells protection under single name credit default swaps and credit default swap index tranches to diversify its credit risk exposure in certain portfolios and, in combination with purchasing securities, to replicate characteristics of similar investments based on the credit quality and term of the credit default swap. Credit default triggers for indexed reference entities and single name reference entities are defined in the contracts. The Company’s maximum exposure to credit loss equals the notional value for credit default swaps. In the event of default of a referencing entity, the Company is typically required to pay the protection holder the full notional value less a recovery amount determined at auction.

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The following table presents the estimated fair value, maximum amount of future payments and weighted average years to maturity of credit default swaps sold by the Company at March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018						December 31, 2017
Rating Agency Designation of Referenced Credit Obligations(1)	Estimated Fair Value of Credit   Default Swaps			Maximum Amount of Future Payments under Credit Default Swaps(2)		Weighted Average Years to Maturity(3)	Estimated Fair Value of Credit   Default Swaps			Maximum Amount of Future Payments under Credit Default Swaps(2)		Weighted Average Years to Maturity(3)
AAA/AA+/AA/AA-/A+/A/A-
Single name credit default swaps	$	2,761		$	152,000	3.0	$	3,128		$	162,000	2.9
Subtotal	2,761			152,000		3.0	3,128			162,000		2.9
BBB+/BBB/BBB-
Single name credit default swaps	4,203			333,700		2.8	4,469			361,700		2.9
Credit default swaps referencing indices	156			422,600		3.7	(55		)	422,600		4.0
Subtotal	4,359			756,300		3.3	4,414			784,300		3.5
BB+/BB/BB-
Single name credit default swaps	(25		)	15,000		1.5	30			5,000		1.5
Subtotal	(25		)	15,000		1.5	30			5,000		1.5
Total	$	7,095		$	923,300	3.2	$	7,572		$	951,300	3.4

(1) The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).

(2) Assumes the value of the referenced credit obligations is zero.

(3) The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

The Company also purchases credit default swaps to reduce its risk against a drop in bond prices due to credit concerns of certain bond issuers. If a credit event, as defined by the contract, occurs, the Company is able to put the bond back to the counterparty at par.

Longevity Swaps

The Company enters into longevity swaps in the form of out-of-the-money options, which provide protection against changes in mortality improvement to retirement plans and insurers of such plans. With a longevity swap transaction, the Company agrees with another party to exchange a proportion of a notional value. The proportion is determined by the difference between a predefined benefit, and the realized benefit plus the future expected benefit, calculated by reference to a population index for a fixed premium.

Mortality Swaps

Mortality swaps have been used by the Company to hedge risk from changes in mortality experience associated with its reinsurance of life insurance risk. The Company agrees with another party to exchange, at specified intervals, a proportion of a notional value determined by the difference between a predefined expected and realized claim amount on a designated index of reinsured lives, for a fixed percentage (premium) each term. The mortality swaps matured in 2017 and an accrued liability for amounts owed to the counterparty is recorded in other liabilities at March 31, 2018.

Synthetic Guaranteed Investment Contracts

The Company sells fee-based synthetic guaranteed investment contracts to retirement plans which include investment-only, stable value contracts. The assets are owned by the trustees of such plans, who invest the assets under the terms of investment guidelines to which the Company agrees. The contracts contain a guarantee of a minimum rate of return on participant balances supported by the underlying assets, and a guarantee of liquidity to meet certain participant-initiated plan cash flow requirements. These contracts are reported as derivatives and recorded at fair value.

Embedded Derivatives

The Company has certain embedded derivatives which are required to be separated from their host contracts and reported as derivatives. Host contracts include reinsurance treaties structured on a modified coinsurance (“modco”) or funds withheld basis. Additionally, the Company reinsures equity-indexed annuity and variable annuity contracts with benefits that are considered embedded derivatives, including guaranteed minimum withdrawal benefits, guaranteed minimum accumulation benefits, and guaranteed minimum income benefits. The changes in fair values of embedded derivatives on equity-indexed annuities described below relate to changes in the fair value associated with capital market and other related assumptions. The Company’s utilization of a credit valuation adjustment (“CVA”) did not have a material effect on the change in fair value of its embedded derivatives for the three months ended March 31, 2018 and 2017.

25

The related gains (losses) and the effect on net income after amortization of deferred acquisition costs (“DAC”) and income taxes for the three months ended March 31, 2018 and 2017 are reflected in the following table (dollars in thousands):

	Three months ended March 31,
	2018		2017
Embedded derivatives in modco or funds withheld arrangements included in investment related gains	$	13,611	$	68,702
After the associated amortization of DAC and taxes, the related amounts included in net income	6,850		25,844
Embedded derivatives in variable annuity contracts included in investment related gains	14,785		22,363
After the associated amortization of DAC and taxes, the related amounts included in net income	11,126		28,836
Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses	25,351		(16,402		)
After the associated amortization of DAC and taxes, the related amounts included in net income	6,537		(21,396		)

Credit Risk

The Company manages its credit risk related to over-the-counter (“OTC”) derivatives by entering into transactions with creditworthy counterparties, maintaining collateral arrangements and through the use of master netting agreements that provide for a single net payment to be made by one counterparty to another at each due date and upon termination.

The credit exposure of the Company’s OTC derivative transactions is represented by the contracts with a positive fair value (market value) at the reporting date. To reduce credit exposures, the Company seeks to (i) enter into OTC derivative transactions pursuant to master netting agreements that provide for a netting of payments and receipts with a single counterparty, and (ii) enter into agreements that allow the use of credit support annexes, which are bilateral rating-sensitive agreements that require collateral postings at established threshold levels. Certain of the Company’s OTC derivatives are cleared derivatives, which are bilateral transactions between the Company and a counterparty where the transactions are cleared through a clearinghouse, such that each derivative counterparty is only exposed to the default of the clearinghouse. These cleared transactions require initial and daily variation margin collateral postings and include certain interest rate swaps and credit default swaps entered into on or after June 10, 2013, related to guidelines implemented under the Dodd-Frank Wall Street Reform and Consumer Protection Act. In 2017, the Company followed the Chicago Mercantile Exchange amended rulebook to legally characterize variation margin payments as settlements of the derivative’s mark-to-market exposure and not collateral. Also, the Company enters into exchange-traded futures through regulated exchanges and these transactions are settled on a daily basis, thereby reducing credit risk exposure in the event of non-performance by counterparties to such financial instruments.

The Company enters into various collateral arrangements, which require both the posting and accepting of collateral in connection with its derivative instruments. Collateral agreements contain attachment thresholds that may vary depending on the posting party’s ratings. Additionally, a decline in the Company’s or the counterparty’s credit ratings to specified levels could result in potential settlement of the derivative positions under the Company’s agreements with its counterparties. The Company also has exchange-traded futures, which require the maintenance of a margin account. As exchange-traded futures are affected through regulated exchanges, and positions are marked to market on a daily basis, the Company has minimal exposure to credit-related losses in the event of nonperformance by counterparties.

The Company’s credit exposure related to derivative contracts is generally limited to the fair value at the reporting date plus or minus any collateral posted or held by the Company. Information regarding the Company’s credit exposure related to its over-the-counter derivative contracts, centrally cleared derivative contracts and margin account for exchange-traded futures at March 31, 2018 and December 31, 2017 are reflected in the following table (dollars in thousands):

	March 31, 2018			December 31, 2017
Estimated fair value of derivatives in net asset position	$	171,169		$	155,714
Cash provided as collateral(1)	3,470			22,221
Securities pledged to counterparties as collateral(2)	57,456			58,156
Cash pledged from counterparties as collateral(3)	(188,407		)	(185,900		)
Securities pledged from counterparties as collateral(4)	—			(862		)
Initial margin for cleared derivatives(2)	(57,456		)	(58,156		)
Net amount after application of master netting agreements and collateral	$	(13,768	)	$	(8,827	)
Margin account related to exchange-traded futures(5)	$	7,382		$	6,538

(1) Consists of receivable from counterparty, included in other assets.

(2) Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.

(3) Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.

(4) Consists of U.S. Treasury and government securities.

(5) Included in other assets.

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6.    Fair Value of Assets and Liabilities

Fair Value Measurement

General accounting principles for Fair Value Measurements and Disclosures define fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. These principles also establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value and describes three levels of inputs that may be used to measure fair value:

Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. The Company’s Level 1 assets and liabilities are traded in active exchange markets.

Level 2 - Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or market standard valuation techniques and assumptions that use significant inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the related assets or liabilities. Prices are determined using valuation methodologies such as discounted cash flow models and other similar techniques that require management’s judgment or estimation in developing inputs that are consistent with what other market participants would use when pricing similar assets and liabilities. Additionally, the Company’s embedded derivatives, all of which are associated with reinsurance treaties and longevity and mortality swaps, are classified in Level 3 since their values include significant unobservable inputs.

For a discussion of the Company’s valuation methodologies for assets and liabilities measured at fair value and the fair value hierarchy, see Note 6 in the Notes to Consolidated Financial Statements included in the Company’s 2017 Annual Report.

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Assets and Liabilities by Hierarchy Level

Assets and liabilities measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 are summarized below (dollars in thousands):

March 31, 2018:				Fair Value Measurements Using:
	Total			Level 1		Level 2			Level 3
Assets:
Fixed maturity securities – available-for-sale:
Corporate	$	23,520,469		$	—	$	22,221,205		$	1,299,264
Canadian government	4,097,854			—		3,525,107			572,747
RMBS	1,787,148			—		1,666,534			120,614
ABS	1,734,722			—		1,604,016			130,706
CMBS	1,281,933			—		1,280,049			1,884
U.S. government	1,436,114			1,313,806		101,255			21,053
State and political subdivisions	713,513			—		671,637			41,876
Other foreign government	3,373,507			—		3,368,503			5,004
Total fixed maturity securities – available-for-sale	37,945,260			1,313,806		34,438,306			2,193,148
Equity securities	103,983			67,831		—			36,152
Funds withheld at interest – embedded derivatives	135,805			—		—			135,805
Cash equivalents	538,761			538,761		—			—
Short-term investments	58,499			67		55,215			3,217
Other invested assets:
Derivatives:
Interest rate swaps	40,812			—		40,812			—
Foreign currency forwards	6,932			—		6,932			—
CPI swaps	(99		)	—		(99		)	—
Credit default swaps	5,465			—		5,465			—
Equity options	27,140			—		27,140			—
Foreign currency swaps	51,945			—		51,945			—
FVO contractholder-directed unit-linked investments	221,512			221,043		469			—
Total other invested assets	353,707			221,043		132,664			—
Other assets - longevity swaps	44,011			—		—			44,011
Total	$	39,180,026		$	2,141,508	$	34,626,185		$	2,412,333
Liabilities:
Interest sensitive contract liabilities – embedded derivatives	$	964,795		$	—	$	—		$	964,795
Other liabilities:
Derivatives:
Interest rate swaps	11,752			—		11,752			—
Foreign currency forwards	(345		)	—		(345		)	—
CPI swaps	201			—		201			—
Credit default swaps	(756		)	—		(756		)	—
Equity options	(6,818		)	—		(6,818		)	—
Foreign currency swaps	1,003			—		1,003			—
Mortality swaps	1,683			—		—			1,683
Total	$	971,515		$	—	$	5,037		$	966,478

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December 31, 2017:				Fair Value Measurements Using:
	Total			Level 1		Level 2			Level 3
Assets:
Fixed maturity securities – available-for-sale:
Corporate	$	23,210,968		$	—	$	21,873,696		$	1,337,272
Canadian government	4,220,076			—		3,626,134			593,942
RMBS	1,719,880			—		1,611,998			107,882
ABS	1,648,362			—		1,524,888			123,474
CMBS	1,303,387			—		1,300,153			3,234
U.S. government	1,943,592			1,818,006		103,075			22,511
State and political subdivisions	703,428			—		662,225			41,203
Other foreign government	3,401,127			—		3,396,035			5,092
Total fixed maturity securities – available-for-sale	38,150,820			1,818,006		34,098,204			2,234,610
Equity securities:
Non-redeemable preferred stock	39,806			39,806		—			—
Other equity securities	60,346			60,346		—			—
Funds withheld at interest – embedded derivatives	122,194			—		—			122,194
Cash equivalents	356,788			354,071		2,717			—
Short-term investments	50,746			—		47,650			3,096
Other invested assets:
Derivatives:
Interest rate swaps	51,359			—		51,359			—
Foreign currency forwards	730			—		730			—
CPI swaps	(221		)	—		(221		)	—
Credit default swaps	5,908			—		5,908			—
Equity options	16,932			—		16,932			—
Foreign currency swaps	62,905			—		62,905			—
FVO contractholder-directed unit-linked investments	218,541			217,618		923			—
Total other invested assets	356,154			217,618		138,536			—
Other assets - longevity swaps	40,659			—		—			40,659
Total	$	39,177,513		$	2,489,847	$	34,287,107		$	2,400,559
Liabilities:
Interest sensitive contract liabilities – embedded derivatives	$	1,014,228		$	—	$	—		$	1,014,228
Other liabilities:
Derivatives:
Interest rate swaps	14,311			—		14,311			—
Foreign currency forwards	7,213			—		7,213			—
CPI swaps	1,939			—		1,939			—
Credit default swaps	(760		)	—		(760		)	—
Equity options	(6,339		)	—		(6,339		)	—
Foreign currency swaps	6,194			—		6,194			—
Mortality swaps	1,683			—		—			1,683
Total	$	1,038,469		$	—	$	22,558		$	1,015,911

Transfers between Levels 1 and 2

Transfers between Levels 1 and 2 are made to reflect changes in observability of inputs and market activity. There were no transfers between Level 1 and Level 2 for the quarter ended March 31, 2018. The Company recognizes transfers of assets and liabilities into and out of levels within the fair value hierarchy at the beginning of the quarter in which the actual event or change in circumstances that caused the transfer occurs. The following tables present the transfers between Level 1 and Level 2 during the three months ended March 31, 2017 (dollars in thousands):

	2017
	Transfers from     Level 1 to Level 2		Transfers from     Level 2 to Level 1
Fixed maturity securities - available-for-sale:
Corporate	$	—	$	38,675

29

Quantitative Information Regarding Internally - Priced Level 3 Assets and Liabilities

The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements that are developed internally by the Company as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	Estimated Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
	March 31, 2018	December 31, 2017			March 31, 2018		December 31, 2017
Assets:
Corporate	$183,680	$173,579	Market comparable securities	Liquidity premium	0-2% (1%)		0-2%  (1%)
				EBITDA Multiple	5.9X - 7.5X (6.6X)		—
U.S. government	21,053	22,511	Market comparable securities	Liquidity premium	0-1% (1%)		0-1%  (1%)
State and political subdivisions	4,452	4,616	Market comparable securities	Liquidity premium	1	%	1	%
Equity securities	25,987	—	Market comparable securities	Liquidity premium	3%		—
				EBITDA Multiple	6.9X - 13.1X (8.0X)		—
Funds withheld at interest- embedded derivatives	135,805	122,194	Total return swap	Mortality	0-100%  (2%)		0-100%  (2%)
				Lapse	0-35%  (9%)		0-35%  (9%)
				Withdrawal	0-5%  (3%)		0-5%  (3%)
				CVA	0-5%  (1%)		0-5%  (1%)
				Crediting rate	2-4%  (2%)		2-4%  (2%)
Longevity swaps	44,011	40,659	Discounted cash flow	Mortality	0-100%  (2%)		0-100%  (2%)
				Mortality improvement	(10%)-10%   (3%)		(10%)-10%   (3%)
Liabilities:
Interest sensitive contract liabilities- embedded derivatives- indexed annuities	827,109	861,758	Discounted cash flow	Mortality	0-100%  (2%)		0-100% (2%)
				Lapse	0-35%  (9%)		0-35% (9%)
				Withdrawal	0-5%  (3%)		0-5% (3%)
				Option budget projection	2-4%  (2%)		2-4% (2%)
Interest sensitive contract liabilities- embedded derivatives- variable annuities	137,686	152,470	Discounted cash  flow	Mortality	0-100% (1%)		0-100% (1%)
				Lapse	0-25% (5%)		0-25% (5%)
				Withdrawal	0-7% (4%)		0-7% (3%)
				CVA	0-5% (1%)		0-5% (1%)
				Long-term volatility	0-27% (13%)		0-27% (8%)
Mortality swaps	1,683	1,683	Discounted cash flow	Mortality	0-100%  (1%)		0-100%  (1%)

Changes in Level 3 Assets and Liabilities

Assets and liabilities transferred into Level 3 are due to a lack of observable market transactions and price information. Assets and liabilities are transferred out of Level 3 when circumstances change such that significant inputs can be corroborated with market observable data. This may be due to a significant increase in market activity for the asset or liability, a specific event, one or more significant input(s) becoming observable. Transfers out of Level 3 were primarily the result of the Company obtaining observable pricing information or a third party pricing quotation that appropriately reflects the fair value of those assets and liabilities. In addition, certain transfers out of Level 3 were also due to ratings upgrades on mortgage-backed securities that had previously had below investment-grade ratings. The Company also transferred equity securities with a fair value of approximately $38.9 million into Level 3 as a result of the adoption of the new accounting guidance for the recognition and measurement of equity securities.

30

For further information on the Company’s valuation processes, see Note 6 in the Notes to Consolidated Financial Statements included in the Company’s 2017 Annual Report.

The reconciliations for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows (dollars in thousands):

For the three months ended March 31, 2018:	Fixed maturity securities - available-for-sale
	Corporate			Canadian government			RMBS			ABS
Fair value, beginning of period	$	1,337,272		$	593,942		$	107,882		$	123,474
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	(361		)	3,444			(92		)	106
Investment related gains (losses), net	—			—			—			2
Included in other comprehensive income	(32,852		)	(24,639		)	(1,110		)	853
Purchases(1)	100,170			—			20,916			11,000
Sales(1)	(6,180		)	—			—			—
Settlements(1)	(75,146		)	—			(2,963		)	(2,739		)
Transfers into Level 3	7,166			—			—			—
Transfers out of Level 3	(30,805		)	—			(4,019		)	(1,990		)
Fair value, end of period	$	1,299,264		$	572,747		$	120,614		$	130,706
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	(361	)	$	3,444		$	(92	)	$	106

For the three months ended March 31, 2018 (continued):	Fixed maturity securities - available-for-sale
	CMBS			U.S. government			State and political subdivisions			Other foreign government
Fair value, beginning of period	$	3,234		$	22,511		$	41,203		$	5,092
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	—			(110		)	8			—
Included in other comprehensive income	(47		)	(340		)	700			(88		)
Purchases(1)	—			96			—			—
Settlements(1)	(1		)	(1,104		)	(35		)	—
Transfers out of Level 3	(1,302		)	—			—			—
Fair value, end of period	$	1,884		$	21,053		$	41,876		$	5,004
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	—		$	(110	)	$	8		$	—

31

For the three months ended March 31, 2018 (continued):	Equity securities			Funds withheld at interest- embedded derivatives		Short-term Investments			Other assets - longevity swaps		Interest sensitive contract liabilities embedded derivatives			Other liabilities - mortality swaps
Fair value, beginning of period	$	—		$	122,194	$	3,096		$	40,659	$	(1,014,229	)	$	(1,683	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment related gains (losses), net	(2,677		)	13,611		—			—		14,785			—
Interest credited	—			—		—			—		25,351			—
Included in other comprehensive income	—			—		(25		)	1,085		—			—
Other revenues	—			—		—			2,267		—			—
Purchases(1)	—			—		146			—		(8,508		)	—
Sales(1)	(28		)	—		—			—		—			—
Settlements(1)	(48		)	—		—			—		17,807			—
Transfers into Level 3	38,905			—		—			—		—			—
Fair value, end of period	$	36,152		$	135,805	$	3,217		$	44,011	$	(964,794	)	$	(1,683	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	—		$	—	$	—		$	—	$	—		$	—
Investment related gains (losses), net	(2,705		)	13,611		—			—		12,901			—
Other revenues	—			—		—			2,267		—			—
Interest credited	—			—		—			—		7,544			—

For the three months ended March 31, 2017:	Fixed maturity securities - available-for-sale
	Corporate			Canadian governments		RMBS			ABS			CMBS			U.S. government
Fair value, beginning of period	$	1,272,253		$	475,965	$	160,291		$	219,280		$	21,145		$	24,488
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	(423		)	3,070		(245		)	1,018			709			(117		)
Investment related gains (losses), net	(1,231		)	—		365			—			(595		)	—
Included in other comprehensive income	4,948			4,525		650			5,767			(83		)	52
Purchases(1)	45,914			—		16,499			10,849			—			104
Sales(1)	—			—		(10,604		)	—			(3,720		)	—
Settlements(1)	(71,470		)	—		(6,784		)	(18,154		)	(5,401		)	(1,053		)
Transfers into Level 3	13,934			—		77			35,258			—			—
Transfers out of Level 3	—			—		(16,819		)	(45,582		)	(10,132		)	—
Fair value, end of period	$	1,263,925		$	483,560	$	143,430		$	208,436		$	1,923		$	23,474
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	(423	)	$	3,070	$	(91	)	$	161		$	—		$	(117	)
Investment related gains (losses), net	(1,293		)	—		(346		)	—			—			—

32

For the three months ended March 31, 2017 (continued):	Fixed maturity securities available-for-sale
	State and political subdivisions			Other foreign government			Funds withheld at interest- embedded derivatives			Short-term Investments			Other assets - longevity swaps		Interest sensitive contract liabilities embedded derivatives			Other liabilities - mortality swaps
Fair value, beginning of period	$	41,666		$	12,869		$	(22,529	)	$	3,346		$	26,958	$	(990,308	)	$	(2,462	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	(88		)	—			—			—			—		—			—
Investment related gains (losses), net	—			—			68,702			—			—		22,362			—
Interest credited	—			—			—			—			—		(16,402		)	—
Included in other comprehensive income	(843		)	(191		)	—			33			347		—			—
Other revenues	—			—			—			—			1,865		—			(395		)
Purchases(1)	—			—			—			32			—		(6,393		)	—
Settlements(1)	(33		)	(334		)	—			(135		)	—		17,811			—
Transfers out of Level 3	(6,844		)	—			—			—			—		—			—
Fair value, end of period	$	33,858		$	12,344		$	46,173		$	3,276		$	29,170	$	(972,930	)	$	(2,857	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	(88	)	$	—		$	—		$	—		$	—	$	—		$	—
Investment related gains (losses), net	—			—			68,702			—			—		20,300			—
Other revenues	—			—			—			—			1,865		—			(395		)
Interest credited	—			—			—			—			—		(34,214		)	—

(1) The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

Nonrecurring Fair Value Measurements

During the three months ended March 31, 2018 and March 31, 2017, the Company did not have any adjustments to its assets or liabilities measured at fair value on a nonrecurring basis that are still held at the reporting date.

Fair Value of Financial Instruments

The Company is required by general accounting principles for Fair Value Measurements and Disclosures to disclose the fair value of certain financial instruments including those that are not carried at fair value. The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments, which were not measured at fair value on a recurring basis, as of March 31, 2018 and December 31, 2017 (dollars in thousands). For additional information regarding the methods and significant assumptions used by the Company to estimate these fair values, see Note 6 in the Notes to Consolidated Financial Statements included in the Company’s 2017 Annual Report. This table excludes any payables or receivables for collateral under repurchase agreements and other transactions. The estimated fair value of the excluded amount approximates carrying value as they equal the amount of cash collateral received/paid.

33

March 31, 2018:	Carrying Value (1)		Estimated  Fair Value		Fair Value Measurement Using:
					Level 1		Level 2		Level 3		NAV
Assets:
Mortgage loans on real estate	$	4,437,994	$	4,411,472	$	—	$	—	$	4,411,472	$	—
Policy loans	1,346,930		1,346,930		—		1,346,930		—		—
Funds withheld at interest	5,865,791		6,098,479		—		—		6,098,479		—
Cash and cash equivalents	971,646		971,646		971,646		—		—		—
Short-term investments	71,931		71,931		71,931		—		—		—
Other invested assets	690,200		710,009		10,165		68,903		283,205		347,736
Accrued investment income	408,338		408,338		—		408,338		—		—
Liabilities:
Interest-sensitive contract liabilities	$	13,169,951	$	13,151,162	$	—	$	—	$	13,151,162	$	—
Long-term debt	2,788,240		2,916,200		—		—		2,916,200		—
Collateral finance and securitization notes	753,393		692,696		—		—		692,696		—
December 31, 2017:
Assets:
Mortgage loans on real estate	$	4,400,533	$	4,477,654	$	—	$	—	$	4,477,654	$	—
Policy loans	1,357,624		1,357,624		—		1,357,624		—		—
Funds withheld at interest	5,955,092		6,275,623		—		—		6,275,623		—
Cash and cash equivalents	946,736		946,736		946,736		—		—		—
Short-term investments	42,558		42,558		42,558		—		—		—
Other invested assets	651,792		679,377		28,540		67,778		247,934		335,125
Accrued investment income	392,721		392,721		—		392,721		—		—
Liabilities:
Interest-sensitive contract liabilities	$	12,683,872	$	12,917,243	$	—	$	—	$	12,917,243	$	—
Long-term debt	2,788,365		2,959,912		—		—		2,959,912		—
Collateral finance and securitization notes	783,938		722,145		—		—		722,145		—

(1) Carrying values presented herein may differ from those in the Company’s condensed consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.

7. Segment Information

The accounting policies of the segments are the same as those described in the Summary of Significant Accounting Policies in Note 2 of the consolidated financial statements accompanying the 2017 Annual Report. The Company measures segment performance primarily based on profit or loss from operations before income taxes. There are no intersegment reinsurance transactions and the Company does not have any material long-lived assets.

The Company allocates capital to its segments based on an internally developed economic capital model, the purpose of which is to measure the risk in the business and to provide a basis upon which capital is deployed. The economic capital model considers the unique and specific nature of the risks inherent in the Company’s businesses. As a result of the economic capital allocation process, a portion of investment income is attributed to the segments based on the level of allocated capital. In addition, the segments are charged for excess capital utilized above the allocated economic capital basis. This charge is included in policy acquisition costs and other insurance expenses.

34

The Company has geographic-based and business-based operational segments. Geographic-based operations are further segmented into traditional and financial solutions businesses. Information related to revenues, income (loss) before income taxes and total assets of the Company for each reportable segment are summarized below (dollars in thousands):

	Three months ended March 31,
Revenues:	2018		2017
U.S. and Latin America:
Traditional	$	1,489,694	$	1,488,503
Financial Solutions	213,352		298,846
Total	1,703,046		1,787,349
Canada:
Traditional	302,319		264,275
Financial Solutions	12,777		11,807
Total	315,096		276,082
Europe, Middle East and Africa:
Traditional	393,782		318,086
Financial Solutions	88,143		79,989
Total	481,925		398,075
Asia Pacific:
Traditional	614,539		505,230
Financial Solutions	19,846		20,452
Total	634,385		525,682
Corporate and Other	39,255		21,552
Total	$	3,173,707	$	3,008,740

	Three months ended March 31,
Income (loss) before income taxes:	2018			2017
U.S. and Latin America:
Traditional	$	2,892		$	29,960
Financial Solutions	67,421			103,586
Total	70,313			133,546
Canada:
Traditional	23,707			19,328
Financial Solutions	3,191			3,592
Total	26,898			22,920
Europe, Middle East and Africa:
Traditional	15,421			13,976
Financial Solutions	39,164			31,918
Total	54,585			45,894
Asia Pacific:
Traditional	22,887			41,688
Financial Solutions	4,021			5,872
Total	26,908			47,560
Corporate and Other	(40,779		)	(42,076		)
Total	$	137,925		$	207,844

Assets:	March 31, 2018		December 31, 2017
U.S. and Latin America:
Traditional	$	18,839,888	$	18,603,423
Financial Solutions	16,349,148		15,959,206
Total	35,189,036		34,562,629
Canada:
Traditional	4,234,253		4,161,452
Financial Solutions	126,747		126,372
Total	4,361,000		4,287,824
Europe, Middle East and Africa:
Traditional	3,385,127		3,099,495
Financial Solutions	5,279,499		5,274,993
Total	8,664,626		8,374,488
Asia Pacific:
Traditional	5,095,054		4,915,442
Financial Solutions	1,175,002		1,198,585
Total	6,270,056		6,114,027
Corporate and Other	6,470,105		7,175,850
Total	$	60,954,823	$	60,514,818

35

8. Commitments, Contingencies and Guarantees

Commitments

Funding of Investments

The Company’s commitments to fund investments as of March 31, 2018 and December 31, 2017 are presented in the following table (dollars in thousands):

	March 31, 2018		December 31, 2017
Limited partnership interests and joint ventures	$	482,149	$	485,197
Commercial mortgage loans	67,837		40,815
Bank loans and private placements	96,808		60,472
Equity release mortgages	132,523		153,937

The Company anticipates that the majority of its current commitments will be invested over the next five years; however, these commitments could become due any time at the request of the counterparties. Bank loans and private placements are included in fixed maturity securities available-for-sale.

Contingencies

Litigation

The Company is subject to litigation in the normal course of its business. The Company currently has no material litigation. A legal reserve is established when the Company is notified of an arbitration demand or litigation or is notified that an arbitration demand or litigation is imminent, it is probable that the Company will incur a loss as a result and the amount of the probable loss is reasonably capable of being estimated.

Other Contingencies

The Company indemnifies its directors and officers as provided in its charters and by-laws. Since this indemnity generally is not subject to limitation with respect to duration or amount, the Company does not believe that it is possible to determine the maximum potential amount due under this indemnity in the future.

Guarantees

Statutory Reserve Support

RGA, through wholly-owned subsidiaries, has committed to provide statutory reserve support to third parties, in exchange for a fee, by funding loans if certain defined events occur. Such statutory reserves are required under the U.S. Valuation of Life Policies Model Regulation (commonly referred to as Regulation XXX for term life insurance policies and Regulation A-XXX for universal life secondary guarantees). The third parties have recourse to RGA should the subsidiary fail to provide the required funding, however, as of March 31, 2018, the Company does not believe that it will be required to provide any funding under these commitments as the occurrence of the defined events is considered remote. The following table presents the maximum potential obligation for these commitments as of March 31, 2018 (dollars in millions):

Commitment Period	Maximum Potential Obligation
2023	$	500.0
2033	450.0
2034	2,000.0
2035	1,314.2
2036	1,932.0
2037	6,750.0
2038	800.0

36

Other Guarantees

RGA has issued guarantees to third parties on behalf of its subsidiaries for the payment of amounts due under certain securities borrowing and repurchase arrangements, financing arrangements and office lease obligations, whereby, if a subsidiary fails to meet an obligation, RGA or one of its other subsidiaries will make a payment to fulfill the obligation. Additionally, in limited circumstances, treaty guarantees are granted to ceding companies in order to provide them additional security, particularly in cases where RGA’s subsidiary is relatively new, unrated, or not of a significant size, relative to the ceding company. Liabilities supported by the treaty guarantees, before consideration for any legally offsetting amounts due from the guaranteed party are reflected on the Company’s condensed consolidated balance sheets in future policy benefits. Potential guaranteed amounts of future payments will vary depending on production levels and underwriting results. Guarantees related to securities borrowing and repurchase arrangements provide additional security to third parties should a subsidiary fail to provide securities when due. RGA’s guarantees issued as of March 31, 2018 and December 31, 2017 are reflected in the following table (dollars in thousands):

	March 31, 2018		December 31, 2017
Treaty guarantees	$	949,443	$	1,047,449
Treaty guarantees, net of assets in trust	832,487		926,393
Securities borrowing and repurchase arrangements	291,325		294,325
Financing arrangements	77,858		86,183
Lease obligations	1,465		1,662

9. Income Tax

The Company's effective tax rates differed from the applicable U.S. federal income tax statutory rates of 21% and 35% as a result of the following for the three months ended March 31, 2018 and 2017, respectively (dollars in thousands):

	Three months ended March 31,
	2018			2017
Tax provision at U.S. statutory rate	$	28,964		$	72,745
Increase (decrease) in income taxes resulting from:
U.S. Tax Reform provisional adjustments	775			—
Foreign tax rate differing from U.S. tax rate	1,432			(6,153		)
Differences in tax bases in foreign jurisdictions	(5,760		)	(3,383		)
Deferred tax valuation allowance	7,947			1,182
Amounts related to tax audit contingencies	835			611
Corporate rate changes	111			(1,237		)
Subpart F	658			186
Foreign tax credits	(572		)	(126		)
Global intangible low-taxed income, net of credit	4,409			—
Return to provision adjustments	—			229
Equity compensation excess benefit	(1,114		)	(1,856		)
Other, net	10			134
Total provision for income taxes	$	37,695		$	62,332
Effective tax rate	27.3		%	30.0		%

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“U.S. Tax Reform”) was signed into law. U.S. Tax Reform makes broad and complex changes to the U.S. tax code, including but not limited to, (1) reducing the U.S. federal corporate tax rate from 35% to 21%; (2) requiring companies to pay a one-time transition tax on certain unrepatriated earnings of foreign subsidiaries; (3) generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries; (4) eliminating the corporate alternative minimum tax (“AMT”) and changing how existing AMT credits can be realized; (5) creating the base erosion anti-abuse tax (“BEAT”), a new minimum tax; (6) establishing a new provision designed to tax global intangible low-taxed income (“GILTI”), which allows for the possibility of using foreign tax credits and a deduction of up to 50 percent to offset the income tax liability (subject to some limitations); and (7) changing rules related to uses and limitations of net operating loss carryforwards created in tax years beginning after December 31, 2017.

Companies subject to GILTI have the option to account for the GILTI tax as a period cost if and when incurred, or to recognize deferred taxes for temporary differences including outside basis differences expected to reverse as GILTI. The Company has not yet made a policy election to account for GILTI, but included an estimate of the current GILTI impact in the tax provision.

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As of March 31, 2018, the Company has not yet completed its accounting for the tax effects of the enactment of the U.S. Tax Reform. The Company continues to gather additional information to account for the effects of U.S. Tax Reform such as information to more precisely compute the pretax deferred tax items upon which the change in rate was applied and refine the necessary valuation allowance related to the foreign tax credits. Also, the Company also continues to monitor new regulatory and accounting guidance which could impact the provisional balances recorded as of December 31, 2017.

The effective tax rate for the three months ended March 31, 2018 was higher than the U.S. Statutory rate of 21.0% primarily as a result of income in non-U.S. jurisdictions with higher tax rates than the U.S., the inclusion of U.S. tax related to GILTI and losses in foreign jurisdictions for which the company established a valuation allowance. The higher rate was partially offset with tax benefits related to bases differences in non-U.S. jurisdictions.

10.    Employee Benefit Plans

The components of net periodic benefit cost, included in other operating expenses on the condensed consolidated statements of income, for the three months ended March 31, 2018 and 2017 were as follows (dollars in thousands):

	Pension Benefits						Other Benefits
	Three months ended March 31,						Three months ended March 31,
	2018			2017			2018			2017
Service cost	$	2,654		$	2,580		$	636		$	721
Interest cost	1,330			1,198			530			565
Expected return on plan assets	(1,554		)	(1,285		)	—			—
Amortization of prior service cost (credit)	83			74			(329		)	(156		)
Amortization of prior actuarial losses	1,094			1,081			498			457
Settlements	—			257			—			—
Net periodic benefit cost	$	3,607		$	3,905		$	1,335		$	1,587

The Company made no pension contributions during the first three months of 2018 and expects to make pension contributions between $8.0 million and $10.0 million in 2018.

11. Reinsurance

Retrocession reinsurance treaties do not relieve the Company from its obligations to direct writing companies. Failure of retrocessionaires to honor their obligations could result in losses to the Company. Consequently, allowances would be established for amounts deemed uncollectible. At March 31, 2018 and December 31, 2017, no allowances were deemed necessary. The Company regularly evaluates the financial condition of the insurance companies from which it assumes and to which it cedes reinsurance.

Retrocessions are arranged through the Company’s retrocession pools for amounts in excess of the Company’s retention limit. As of March 31, 2018 and December 31, 2017, all rated retrocession pool participants followed by the A.M. Best Company were rated “A- (excellent)” or better. The Company verifies retrocession pool participants’ ratings on a quarterly basis. For a majority of the retrocessionaires that were not rated, security in the form of letters of credit or trust assets has been posted. In addition, the Company performs annual financial reviews of its retrocessionaires to evaluate financial stability and performance. In addition to its third party retrocessionaires, various RGA reinsurance subsidiaries retrocede amounts in excess of their retention to affiliated subsidiaries.

The following table presents information for the Company’s reinsurance ceded receivable assets, including the respective amount and A.M. Best rating for each reinsurer representing in excess of five percent of the total as of March 31, 2018 and December 31, 2017 (dollars in thousands):

		March 31, 2018				December 31, 2017
Reinsurer	A.M. Best Rating	Amount		% of Total		Amount		% of Total
Reinsurer A	A+	$	317,136	39.1	%	$	301,478	38.6	%
Reinsurer B	A+	203,137		25.1		203,898		26.1
Reinsurer C	A	69,434		8.6		67,723		8.7
Reinsurer D	A++	42,967		5.3		40,592		5.2
Reinsurer E	A+	42,538		5.2		40,528		5.2
Other reinsurers		135,342		16.7		127,808		16.2
Total		$	810,554	100.0	%	$	782,027	100.0	%

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Included in the total reinsurance ceded receivables balance were $291.1 million and $243.8 million of claims recoverable, of which $17.6 million and $1.9 million were in excess of 90 days past due, as of March 31, 2018 and December 31, 2017, respectively.

12. New Accounting Standards

Changes to the general accounting principles are established by the Financial Accounting Standards Board (“FASB”) in the form of accounting standards updates to the FASB Accounting Standards Codification™. Accounting standards updates not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on the Company’s condensed consolidated financial statements.

Description	Date of Adoption	Effect on the financial statements or other significant matters
Standards adopted:
Reporting Comprehensive Income This updated guidance requires reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the newly enacted U.S. federal corporate income tax rate. The amount of the reclassification would be the difference between the historical U.S. federal corporate income tax rate and the newly enacted 21 percent tax rate.	December 31, 2017	The Company adopted the new guidance by reclassifying certain income tax effects of items within accumulated other comprehensive income to retained earnings as a result of the Tax Cuts and Jobs Act of 2017. The impact of adopting this standard was an increase in accumulated other comprehensive income and a reduction in retained earnings of approximately $156.4 million.
Stock Compensation This updated guidance requires excess tax benefits and deficiencies from share-based payment awards be recorded in income tax expense in the income statement. Previously, excess tax benefits and deficiencies were recognized in shareholders’ equity or deferred taxes on the balance sheet depending on the tax situation of the Company. In addition, the updated guidance also changes the accounting for forfeitures and statutory tax withholding requirements, as well as the classification in the statement of cash flows.	January 1, 2017	Upon adoption, the Company recognized excess tax benefits of approximately $17.7 million in deferred tax assets that were previously not recognized in a cumulative-effect adjustment increasing retained earnings by $17.7 million. The Company also recorded excess tax benefits of approximately $10.5 million in the provision for income taxes for the year ended December 31, 2017. The number of weighted average diluted shares outstanding were also adjusted to exclude excess tax benefits from the assumed proceeds in the diluted shares calculation resulting in an immaterial increase in the number of dilutive shares outstanding. The Company also elected to continue estimating forfeitures for purposes of recognizing share-based compensation. Other aspects of the adoption of the updated guidance did not have a material impact to the Company’s consolidated financial statements.
Financial Instruments - Recognition and Measurement This guidance requires equity investments that are not accounted for under the equity method of accounting to be measured at fair value with changes recognized in net income and also updates certain presentation and disclosure requirements.	January 1, 2018	This guidance required a cumulative-effect adjustment for certain items upon adoption. The adoption of the new guidance was not material to the Company's consolidated financial statements.

Standards not yet adopted:
Leases This new standard, based on the principle that entities should recognize assets and liabilities arising from leases, does not significantly change the lessees’ recognition, measurement and presentation of expenses and cash flows from the previous accounting standard. Leases are classified as finance or operating. The new standard’s primary change is the requirement for entities to recognize a lease liability for payments and a right of use asset representing the right to use the leased asset during the term of operating lease arrangements. Lessees are permitted to make an accounting policy election to not recognize the asset and liability for leases with a term of twelve months or less. Lessors’ accounting is largely unchanged from the previous accounting standard. In addition, the new standard expands the disclosure requirements of lease arrangements. Early adoption is permitted.	January 1, 2019	This new standard will be adopted by applying a modified retrospective transition approach, which includes a number of practical expedients. The Company is currently evaluating the impact of this amendment on its consolidated financial statements; however, it does not expect the adoption of the new standard to have a material impact on its results of operations or balance sheet as a result of the recognition of right-to-use assets and lease liabilities related to operating leases. Contractual obligations related to operating leases totaled approximately $38.2 million as of December 31, 2017.
Derivatives and Hedging This updated guidance improves the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements and make certain targeted improvements to simplify the application of the hedge accounting in current GAAP related to the assessment of hedge effectiveness. Early adoption is permitted.	January 1, 2019	This new guidance will be adopted by applying a modified retrospective approach to existing hedging relationships as of the date of adoption. The Company is currently evaluating the impact of this updated guidance on its consolidated financial statements.
Financial Instruments - Credit Losses This guidance adds to U.S. GAAP an impairment model, known as current expected credit loss (“CECL”) model that is based on expected losses rather than incurred losses. For traditional and other receivables, held-to-maturity debt securities, loans and other instruments entities will be required to use the new forward-looking “expected loss” model that generally will result in earlier recognition of allowance for losses. For available-for-sale debt securities with unrealized losses, entities will measure credit losses similar to what they do today, except the losses will be recognized as allowances rather than reduction to the amortized cost of the securities. Early adoption is permitted.	January 1, 2020	This guidance will be adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified-retrospective approach). The Company is currently evaluating the impact of this amendment on its consolidated financial statements.

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ITEM 2.        MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Cautionary Note Regarding Forward-Looking Statements

This report contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 including, among others, statements relating to projections of the strategies, earnings, revenues, income or loss, ratios, future financial performance, and growth potential of the Company. The words “intend,” “expect,” “project,” “estimate,” “predict,” “anticipate,” “should,” “believe,” and other similar expressions also are intended to identify forward-looking statements. Forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified. Future events and actual results, performance, and achievements could differ materially from those set forth in, contemplated by, or underlying the forward-looking statements.

Numerous important factors could cause actual results and events to differ materially from those expressed or implied by forward-looking statements including, without limitation, (1) adverse capital and credit market conditions and their impact on the Company’s liquidity, access to capital and cost of capital, (2) the impairment of other financial institutions and its effect on the Company’s business, (3) requirements to post collateral or make payments due to declines in market value of assets subject to the Company’s collateral arrangements, (4) the fact that the determination of allowances and impairments taken on the Company’s investments is highly subjective, (5) adverse changes in mortality, morbidity, lapsation or claims experience, (6) changes in the Company’s financial strength and credit ratings and the effect of such changes on the Company’s future results of operations and financial condition, (7) inadequate risk analysis and underwriting, (8) general economic conditions or a prolonged economic downturn affecting the demand for insurance and reinsurance in the Company’s current and planned markets, (9) the availability and cost of collateral necessary for regulatory reserves and capital, (10) market or economic conditions that adversely affect the value of the Company’s investment securities or result in the impairment of all or a portion of the value of certain of the Company’s investment securities, that in turn could affect regulatory capital, (11) market or economic conditions that adversely affect the Company’s ability to make timely sales of investment securities, (12) risks inherent in the Company’s risk management and investment strategy, including changes in investment portfolio yields due to interest rate or credit quality changes, (13) fluctuations in U.S. or foreign currency exchange rates, interest rates, or securities and real estate markets, (14) adverse litigation or arbitration results, (15) the adequacy of reserves, resources and accurate information relating to settlements, awards and terminated and discontinued lines of business, (16) the stability of and actions by governments and economies in the markets in which the Company operates, including ongoing uncertainties regarding the amount of U.S. sovereign debt and the credit ratings thereof, (17) competitive factors and competitors’ responses to the Company’s initiatives, (18) the success of the Company’s clients, (19) successful execution of the Company’s entry into new markets, (20) successful development and introduction of new products and distribution opportunities, (21) the Company’s ability to successfully integrate acquired blocks of business and entities, (22) action by regulators who have authority over the Company’s reinsurance operations in the jurisdictions in which it operates, (23) the Company’s dependence on third parties, including those insurance companies and reinsurers to which the Company cedes some reinsurance, third-party investment managers and others, (24) the threat of natural disasters, catastrophes, terrorist attacks, epidemics or pandemics anywhere in the world where the Company or its clients do business, (25) interruption or failure of the Company’s telecommunication, information technology or other operational systems, or the Company’s failure to maintain adequate security to protect the confidentiality or privacy of personal or sensitive data stored on such systems, (26) changes in laws, regulations, and accounting standards applicable to the Company, its subsidiaries, or its business, (27) the benefits or burdens associated with the Tax Cuts and Jobs Act of 2017 may be different than expected, (28) the effect of the Company’s status as an insurance holding company and regulatory restrictions on its ability to pay principal of and interest on its debt obligations, and (29) other risks and uncertainties described in this document and in the Company’s other filings with the Securities and Exchange Commission (“SEC”).

Forward-looking statements should be evaluated together with the many risks and uncertainties that affect the Company’s business, including those mentioned in this document and described in the periodic reports the Company files with the SEC. These forward-looking statements speak only as of the date on which they are made. The Company does not undertake any obligations to update these forward-looking statements, even though the Company’s situation may change in the future. For a discussion of these risks and uncertainties that could cause actual results to differ materially from those contained in the forward-looking statements, you are advised to see Item 1A – “Risk Factors” in the 2017 Annual Report.

Overview

The Company is among the leading global providers of life reinsurance and financial solutions, with $3.4 trillion of life reinsurance in force. Traditional reinsurance includes individual and group life and health, disability, and critical illness reinsurance. Financial solutions includes longevity reinsurance, asset-intensive reinsurance, and financial reinsurance. The Company derives revenues primarily from renewal premiums from existing reinsurance treaties, new business premiums from existing or new reinsurance treaties, fee income from financial solutions business and income earned on invested assets.

Historically, the Company’s primary business has been traditional life reinsurance, which involves reinsuring life insurance policies that are often in force for the remaining lifetime of the underlying individuals insured, with premiums earned typically over a

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period of 10 to 30 years. Each year, however, a portion of the business under existing treaties terminates due to, among other things, lapses or voluntary surrenders of underlying policies, deaths of insureds, and the exercise of recapture options by ceding companies. The Company has expanded its financial solutions business, including significant asset-intensive and longevity risk transactions, which allow its clients to take advantage of growth opportunities and manage their capital, longevity and investment risk.

The Company’s long-term profitability largely depends on the volume and amount of death- and health-related claims incurred and the ability to adequately price the risks it assumes. While death claims are reasonably predictable over a period of many years, claims become less predictable over shorter periods and are subject to significant fluctuation from quarter to quarter and year to year. Additionally, the Company generates profits on investment spreads associated with the reinsurance of investment type contracts and generates fees from financial reinsurance transactions which are typically shorter duration than its traditional life reinsurance business. The Company believes its sources of liquidity are sufficient to cover potential claims payments on both a short-term and long-term basis.

As is customary in the reinsurance business, clients continually update, refine, and revise reinsurance information provided to the Company. Such revised information is used by the Company in preparation of its condensed consolidated financial statements and the financial effects resulting from the incorporation of revised data are reflected in the current period.

Segment Presentation

The Company has geographic-based and business-based operational segments. Geographic-based operations are further segmented into traditional and financial solutions businesses. The Company allocates capital to its segments based on an internally developed economic capital model, the purpose of which is to measure the risk in the business and to provide a consistent basis upon which capital is deployed. The economic capital model considers the unique and specific nature of the risks inherent in RGA’s businesses.

As a result of the economic capital allocation process, a portion of investment income is credited to the segments based on the level of allocated capital. In addition, the segments are charged for excess capital utilized above the allocated economic capital basis. This charge is included in policy acquisition costs and other insurance expenses. Segment investment performance varies with the composition of investments and the relative allocation of capital to the operating segments.

Segment revenue levels can be significantly influenced by currency fluctuations, large transactions, mix of business and reporting practices of ceding companies, and therefore may fluctuate from period to period. Although reasonably predictable over a period of years, segment claims experience can be volatile over shorter periods. See “Results of Operations by Segment” below for further information about the Company’s segments.

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Consolidated Results of Operations

	Three months ended March 31,
	2018			2017
Revenues:	(Dollars in thousands, except per share data)
Net premiums	$	2,582,551		$	2,365,696
Investment income, net of related expenses	516,329			514,364
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	—			(17,189		)
Other investment related gains (losses), net	(470		)	77,712
Total investment related gains (losses), net	(470		)	60,523
Other revenues	75,297			68,157
Total revenues	3,173,707			3,008,740
Benefits and Expenses:
Claims and other policy benefits	2,362,101			2,106,145
Interest credited	80,449			107,684
Policy acquisition costs and other insurance expenses	356,902			379,389
Other operating expenses	191,274			158,506
Interest expense	37,454			42,402
Collateral finance and securitization expense	7,602			6,770
Total benefits and expenses	3,035,782			2,800,896
Income before income taxes	137,925			207,844
Provision for income taxes	37,695			62,332
Net income	$	100,230		$	145,512
Earnings per share:
Basic earnings per share	$	1.55		$	2.26
Diluted earnings per share	$	1.52		$	2.22
Dividends declared per share	$	0.50		$	0.41

Consolidated income before income taxes decreased $69.9 million, or 33.6%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in income for the first three months of 2018 was primarily due to unfavorable claims experience in the U.S. and Asia Pacific segments and a decrease in investment related gains associated with fair value changes on modco or funds withheld treaties compared to 2017, which was caused by changes in interest rates and credit spreads. The decrease in income before income taxes was partially offset by a decrease in impairments on fixed maturity securities of $17.2 million in the first three months of 2018, as compared to the same period in 2017. Foreign currency fluctuations resulted in an increase in income before income taxes of $8.9 million for the first three months of 2018, as compared to the same period in 2017.

The Company recognizes in consolidated income, any changes in the fair value of embedded derivatives on modco or funds withheld treaties, equity-indexed annuity treaties (“EIAs”) and variable annuity products. The combined changes in these three types of embedded derivatives, after adjustment for deferred acquisition costs and retrocession, resulted in an increase in consolidated income before income taxes of $40.9 million and $95.6 million in the first three months of 2018 and 2017, respectively. This fluctuation does not affect current cash flows, crediting rates or spread performance on the underlying treaties. Therefore, management believes it is helpful to distinguish between the effects of changes in these embedded derivatives, net of related hedging activity and deferred acquisition costs, and the primary factors that drive profitability of the underlying treaties, namely investment income, fee income, and interest credited. The individual effect on income before income taxes for these three types of embedded derivatives is as follows:

• The change in the value of embedded derivatives related to reinsurance treaties written on a modco or funds withheld basis are subject to the general accounting principles for derivatives and hedging related to embedded derivatives. The unrealized gains and losses associated with these embedded derivatives, after adjustment for deferred acquisition costs, increased income before income taxes by $10.5 million and $39.8 million in the first three months of 2018 and 2017, respectively.

• Changes in risk-free rates used in the fair value estimates of embedded derivatives associated with EIAs affect the amount of unrealized gains and losses the Company recognizes. The unrealized gains and losses associated with EIAs, after adjustment for deferred acquisition costs and retrocession, increased income before income taxes by $13.3 million and $11.4 million in the first three months of 2018 and 2017, respectively.

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• The change in the Company’s liability for variable annuities associated with guaranteed minimum living benefits affects the amount of unrealized gains and losses the Company recognizes. The unrealized gains and losses associated with guaranteed minimum living benefits, after adjustment for deferred acquisition costs, increased income before income taxes by $17.1 million and $44.4 million in the first three months of 2018 and 2017, respectively. After consideration of the change in fair value of freestanding derivatives used to hedge this liability, income before income taxes decreased by $5.4 million and $4.6 million in the first three months of 2018 and 2017, respectively.

Consolidated net premiums increased $216.9 million, or 9.2%, for the three months ended March 31, 2018, as compared to the same period in 2017, due to growth in life reinsurance in force. Additionally, foreign currency fluctuations contributed to the increase in net premiums by $79.3 million for the first three months of 2018, as compared to the same period in 2017. Consolidated assumed life insurance in force increased to $3,383.8 billion as of March 31, 2018 from $3,136.8 billion as of March 31, 2017 due to new business production, in force transactions and foreign currency exchange fluctuations. The Company added new business production, measured by face amount of insurance in force, of $96.7 billion and $91.6 billion during the first three months of 2018 and 2017, respectively. Favorable foreign currency exchange fluctuations contributed $103.1 billion to the increase in assumed life insurance in force from March 31, 2017. Management believes industry consolidation, regulatory changes and the established practice of reinsuring mortality and morbidity risks should continue to provide opportunities for growth, albeit at rates less than historically experienced in some markets.

Consolidated investment income, net of related expenses, increased $2.0 million, or 0.4%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase is largely attributable to an increase in the average asset base, a higher average investment yield and higher variable investment income. Largely offsetting the increase in investment income was a decrease in the fair value attributed to the Company’s funds withheld at interest investment associated with the reinsurance of certain EIAs increased investment income of $43.3 million in the first three months of 2018, as compared to the same period in 2017. The effect on investment income of the EIA's fair value changes is substantially offset by a corresponding change in interest credited to policyholder account balances resulting in an insignificant effect on net income.

Average invested assets at amortized cost, excluding spread related business, for the three months ended March 31, 2018 totaled $27.0 billion, a 7.2% increase over March 31, 2017. The average yield earned on investments, excluding spread related business, was 4.46% and 4.41% for the three months ended March 31, 2018 and 2017, respectively. The average yield will vary from quarter to quarter and year to year depending on a number of variables, including the prevailing interest rate and credit spread environment, prepayment fees and make-whole premiums, changes in the mix of the underlying investments and cash balances, and the timing of dividends and distributions on certain investments. A continued low interest rate environment is expected to put downward pressure on this yield in future reporting periods.

Investment related gains, net decreased by $61.0 million for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease is primarily due to less favorable changes in the fair value of embedded derivatives on modco or funds withheld treaties in the current period compared to 2017 reflecting the impact of changes in interest rates and credit spreads on the calculation of fair value. Changes in the fair value associated with these embedded derivatives increased investment related gains by $13.6 million and $68.7 million in the first three months of 2018 and 2017, respectively. Partially offsetting this decrease were lower impairments on fixed maturity securities, which decreased by $17.2 million in the first three months of 2018, as compared to the same period in 2017. See Note 4 - “Investments” and Note 5 - “Derivative Instruments” in the Notes to Condensed Consolidated Financial Statements for additional information on the impairment losses and derivatives.

The effective tax rate on a consolidated basis was 27.3% and 30.0% for the first quarter 2018 and 2017, respectively. See Note 9 - “Income Tax” in the Notes to Condensed Consolidated Financial Statements for additional information on the Company’s consolidated effective tax rates.

Critical Accounting Policies

The preparation of financial statements in conformity with GAAP requires the application of accounting policies that often involve a significant degree of judgment. Management, on an ongoing basis, reviews estimates and assumptions used in the preparation of financial statements. If management determines that modifications in assumptions and estimates are appropriate given current facts and circumstances, results of operations and financial position as reported in the condensed consolidated financial statements could change significantly.

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Management believes the critical accounting policies relating to the following areas are most dependent on the application of estimates and assumptions:

Premiums receivable;

Deferred acquisition costs;

Liabilities for future policy benefits and incurred but not reported claims;

Valuation of investments and other-than-temporary impairments to specific investments;

Valuation of embedded derivatives; and

Income taxes.

A discussion of each of the critical accounting policies may be found in the Company’s 2017 Annual Report under “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Policies.”

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Results of Operations by Segment

U.S. and Latin America Operations

The U.S. and Latin America operations include business generated by its offices in the U.S., Mexico and Brazil. The offices in Mexico and Brazil provide services to clients in other Latin American countries. U.S. and Latin America operations consist of two major segments: Traditional and Financial Solutions. The Traditional segment primarily specializes in individual mortality-risk reinsurance and to a lesser extent, group, health and long-term care reinsurance. The Financial Solutions segment consists of Asset-Intensive and Financial Reinsurance. Asset-Intensive within the Financial Solutions segment provides coinsurance of annuities and corporate-owned life insurance policies and to a lesser extent also issues fee-based synthetic guaranteed investment contracts, which include investment-only, stable value contracts. Financial Reinsurance within the Financial Solutions segment primarily involves assisting ceding companies in meeting applicable regulatory requirements by enhancing the ceding companies’ financial strength and regulatory surplus position through relatively low risk reinsurance transactions. Due to the low-risk nature of financial reinsurance transactions, they typically do not qualify as reinsurance under GAAP, so only the related net fees are reflected in other revenues on the condensed consolidated statements of income.

For the three months ended March 31, 2018:			Financial Solutions
(dollars in thousands)			Asset-Intensive		Financial Reinsurance		Total U.S. and Latin America
	Traditional
Revenues:
Net premiums	$	1,299,422	$	5,192	$	—	$	1,304,614
Investment income, net of related expenses	183,060		157,912		1,822		342,794
Investment related gains (losses), net	1,683		676		—		2,359
Other revenues	5,529		22,959		24,791		53,279
Total revenues	1,489,694		186,739		26,613		1,703,046
Benefits and expenses:
Claims and other policy benefits	1,254,961		15,945		—		1,270,906
Interest credited	20,280		54,212		—		74,492
Policy acquisition costs and other insurance expenses	177,640		62,035		4,000		243,675
Other operating expenses	33,921		7,285		2,454		43,660
Total benefits and expenses	1,486,802		139,477		6,454		1,632,733
Income before income taxes	$	2,892	$	47,262	$	20,159	$	70,313
For the three months ended March 31, 2017:			Financial Solutions
(dollars in thousands)			Asset-Intensive		Financial Reinsurance		Total U.S. and Latin America
	Traditional
Revenues:
Net premiums	$	1,304,345	$	4,635	$	—	$	1,308,980
Investment income, net of related expenses	178,995		187,153		1,664		367,812
Investment related gains (losses), net	1,965		57,771		—		59,736
Other revenues	3,198		23,214		24,409		50,821
Total revenues	1,488,503		272,773		26,073		1,787,349
Benefits and expenses:
Claims and other policy benefits	1,225,640		17,536		—		1,243,176
Interest credited	20,289		79,157		—		99,446
Policy acquisition costs and other insurance expenses	180,810		83,653		5,941		270,404
Other operating expenses	31,804		6,657		2,316		40,777
Total benefits and expenses	1,458,543		187,003		8,257		1,653,803
Income before income taxes	$	29,960	$	85,770	$	17,816	$	133,546

Income before income taxes decreased by $63.2 million, or 47.3%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in income before income taxes was primarily due to unfavorable claims experience in the U.S. Traditional segment and changes in the value of the embedded derivatives associated with reinsurance treaties structured on a modco or funds withheld basis.

Traditional Reinsurance

Income before income taxes for the U.S. and Latin America Traditional segment decreased by $27.1 million, or 90.3%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease is primarily due to unfavorable claims experience in the traditional individual mortality line of business and to a lesser extent, the group disability line of business.

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Net premiums decreased $4.9 million, or 0.4%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease was primarily due to the restructuring of a health treaty, which contributed $23.0 million to the decrease in net premiums. Largely offsetting this decrease was organic growth in traditional mortality and group businesses. The segment added new individual life business production, measured by face amount of insurance in force of $23.3 billion and $26.8 billion in the first three months of 2018 and 2017, respectively.

Net investment income increased $4.1 million, or 2.3%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase was due to higher variable income associated with the sale of a joint venture and limited partnership distributions. Investment related gains (losses), net decreased $0.3 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Claims and other policy benefits as a percentage of net premiums (“loss ratios”) were 96.6% and 94.0% for the three months ended March 31, 2018 and 2017, respectively. The increase in the loss ratio in 2018 was primarily due to unfavorable claims experience in traditional individual mortality and group disability lines of business. Management believes the unfavorable individual life and group disability claims experience reflects normal volatility associated with the influenza season.

Interest credited expense remained flat for the three months ended March 31, 2018, as compared to the same period in 2017. Interest credited in this segment relates to amounts credited on cash value products which also have a significant mortality component. Income before income taxes is affected by the spread between the investment income and the interest credited on the underlying products.

Policy acquisition costs and other insurance expenses as a percentage of net premiums were 13.7% and 13.9% for the three months ended March 31, 2018 and 2017, respectively. Overall, while these ratios are expected to remain in a predictable range, they may fluctuate from period to period due to varying allowance levels within coinsurance-type arrangements. In addition, the amortization pattern of previously capitalized amounts, which are subject to the form of the reinsurance agreement and the underlying insurance policies, may vary. Also, the mix of first year coinsurance business versus yearly renewable term business can cause the percentage to fluctuate from period to period.

Other operating expenses increased $2.1 million, or 6.7%, for the three months ended March 31, 2018, as compared to the same period in 2017. Other operating expenses as a percentage of net premiums were 2.6% and 2.4% for the three month periods ended March 31, 2018 and 2017, respectively. The expense ratio tends to fluctuate only slightly from period to period due to the maturity and scale of this segment.

Financial Solutions - Asset-Intensive Reinsurance

Asset-Intensive reinsurance within the U.S. and Latin America Financial Solutions segment primarily involves assuming investment risk within underlying annuities and corporate-owned life insurance policies. Most of these agreements are coinsurance, coinsurance with funds withheld or modco. The Company recognizes profits or losses primarily from the spread between the investment income earned and the interest credited on the underlying deposit liabilities, income associated with longevity risk and fees associated with variable annuity account values and guaranteed investment contracts.

Impact of certain derivatives:

Income from the asset-intensive business tends to be volatile due to changes in the fair value of certain derivatives, including embedded derivatives associated with reinsurance treaties structured on a modco or funds withheld basis, as well as embedded derivatives associated with the Company’s reinsurance of equity-indexed annuities and variable annuities with guaranteed minimum benefit riders. Fluctuations occur period to period primarily due to changing investment conditions including, but not limited to, interest rate movements (including risk-free rates and credit spreads), implied volatility, the Company’s own credit risk and equity market performance, all of which are factors in the calculations of fair value. Therefore, management believes it is helpful to distinguish between the effects of changes in these derivatives, net of related hedging activity, and the primary factors that drive profitability of the underlying treaties, namely investment income, fee income (included in other revenues), and interest credited. These fluctuations are considered unrealized by management and do not affect current cash flows, crediting rates or spread performance on the underlying treaties.

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The following table summarizes the asset-intensive results and quantifies the impact of these embedded derivatives for the periods presented. Revenues before certain derivatives, benefits and expenses before certain derivatives, and income before income taxes and certain derivatives should not be viewed as substitutes for GAAP revenues, GAAP benefits and expenses, and GAAP income before income taxes.

(dollars in thousands)	Three months ended March 31,
	2018			2017
Revenues:
Total revenues	$	186,739		$	272,773
Less:
Embedded derivatives – modco/funds withheld treaties	11,918			66,738
Guaranteed minimum benefit riders and related free standing derivatives	(4,588		)	(6,895		)
Revenues before certain derivatives	179,409			212,930
Benefits and expenses:
Total benefits and expenses	139,477			187,003
Less:
Embedded derivatives – modco/funds withheld treaties	3,073			28,942
Guaranteed minimum benefit riders and related free standing derivatives	794			(2,282		)
Equity-indexed annuities	(13,268		)	(11,443		)
Benefits and expenses before certain derivatives	148,878			171,786
Income before income taxes:
Income before income taxes	47,262			85,770
Less:
Embedded derivatives – modco/funds withheld treaties	8,845			37,796
Guaranteed minimum benefit riders and related free standing derivatives	(5,382		)	(4,613		)
Equity-indexed annuities	13,268			11,443
Income before income taxes and certain derivatives	$	30,531		$	41,144

Embedded Derivatives - Modco/Funds Withheld Treaties - Represents the change in the fair value of embedded derivatives on funds withheld at interest associated with treaties written on a modco or funds withheld basis. The fair value changes of embedded derivatives on funds withheld at interest associated with treaties written on a modco or funds withheld basis are reflected in revenues, while the related impact on deferred acquisition expenses is reflected in benefits and expenses. The Company’s utilization of a credit valuation adjustment did not have a material effect on the change in fair value of these embedded derivatives for the three months ended March 31, 2018 and 2017.

The change in fair value of the embedded derivatives - modco/funds withheld treaties increased income before income taxes by $8.8 million and $37.8 million for the three months ended March 31, 2018 and 2017, respectively. The increase in income for the three months ended March 31, 2018 was primarily due to tightening credit spreads while the increase in income for the three months ended March 31, 2017 was primarily due to tightening credit spreads and a divergence in the interest rate swap curve relative to treasury rates.

Guaranteed Minimum Benefit Riders - Represents the impact related to guaranteed minimum benefits associated with the Company’s reinsurance of variable annuities. The fair value changes of the guaranteed minimum benefits along with the changes in fair value of the free standing derivatives (interest rate swaps, financial futures and equity options), purchased by the Company to substantially hedge the liability are reflected in revenues, while the related impact on deferred acquisition expenses is reflected in benefits and expenses. The Company’s utilization of a credit valuation adjustment did not have a material effect on the change in fair value of these embedded derivatives for the three months ended March 31, 2018 and 2017.

The change in fair value of the guaranteed minimum benefits, after allowing for changes in the associated free standing derivatives, decreased income before income taxes by $5.4 million and $4.6 million for the three months ended March 31, 2018 and 2017, respectively. The decrease in income for the three months ended March 31, 2018 was primarily the result of interest rate movements. The decrease for the three months ended March 31, 2017 was primarily the result of lower policyholder lapses.

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Equity-Indexed Annuities - Represents changes in the liability for equity-indexed annuities in excess of changes in account value, after adjustments for related deferred acquisition expenses. The change in fair value of embedded derivative liabilities associated with equity-indexed annuities increased income before income taxes by $13.3 million and $11.4 million for the three months ended March 31, 2018 and 2017, respectively.  The increase in income for the three months ended March 31, 2018 was due to lower policyholder lapses and withdrawals. The increase for the three months ended March 31, 2017 was primarily due to changes in the domestic equity markets.

The changes in derivatives discussed above are considered unrealized by management and do not affect current cash flows, crediting rates or spread performance on the underlying treaties. Fluctuations occur period to period primarily due to changing investment conditions including, but not limited to, interest rate movements (including benchmark rates and credit spreads), credit valuation adjustments, implied volatility and equity market performance, all of which are factors in the calculations of fair value. Therefore, management believes it is helpful to distinguish between the effects of changes in these derivatives and the primary factors that drive profitability of the underlying treaties, namely investment income, fee income (included in other revenues) and interest credited.

Discussion and analysis before certain derivatives:

Income before income taxes and certain derivatives decreased by $10.6 million for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease was primarily due to lower investment related gains (losses), net of the corresponding impact to deferred acquisition costs, associated with coinsurance and funds withheld portfolios. Funds withheld capital gains (losses) are reported in investment income.

Revenue before certain derivatives decreased by $33.5 million for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in the first quarter was primarily due to the change in fair value of equity options associated with the reinsurance of EIAs and lower investment related gains (losses) associated with coinsurance and funds withheld portfolios. The effect on investment income related to equity options is substantially offset by a corresponding change in interest credited.

Benefits and expenses before certain derivatives decreased by $22.9 million for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in the first quarter of 2018 was primarily due to lower interest credited associated with the reinsurance of EIAs in coinsurance and funds withheld portfolios. The effect on interest credited related to equity options is substantially offset by a corresponding change in investment income.

The invested asset base supporting this segment increased to $16.0 billion as of March 31, 2018 from $13.2 billion as of March 31, 2017. As of March 31, 2018, $4.1 billion of the invested assets were funds withheld at interest, of which greater than 90% is associated with one client.

Financial Solutions - Financial Reinsurance

Financial Reinsurance within the U.S. and Latin America Financial Solutions segment income before income taxes consists primarily of net fees earned on financial reinsurance transactions. Additionally, a portion of the business is brokered business in which the Company does not participate in the assumption of risk. The fees earned from financial reinsurance contracts and brokered business are reflected in other revenues, and the fees paid to retrocessionaires are reflected in policy acquisition costs and other insurance expenses.

Income before income taxes increased $2.3 million, or 13.2%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase was primarily due to growth from new transactions.

As of March 31, 2018 and 2017, the amount of reinsurance assumed from client companies, as measured by pre-tax statutory surplus, risk based capital and other financial structures was $13.3 billion and $10.6 billion, respectively. The increase was primarily due to a number of new transactions, as well as organic growth on existing transactions. Fees earned from this business can vary significantly depending on the size of the transactions and the timing of their completion and therefore can fluctuate from period to period.

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Canada Operations

The Company conducts reinsurance business in Canada primarily through RGA Canada, which assists clients with capital management activity and mortality and morbidity risk management. The Canada operations is primarily engaged in Traditional reinsurance, which consists mainly of traditional individual life reinsurance, as well as creditor, group life and health, critical illness and disability reinsurance. Creditor insurance covers the outstanding balance on personal, mortgage or commercial loans in the event of death, disability or critical illness and is generally shorter in duration than traditional individual life insurance. The Canada Financial Solutions segment consists of longevity and financial reinsurance.

(dollars in thousands)	Three months ended March 31,
	2018								2017
Revenues:	Traditional			Financial Solutions		Total Canada			Traditional		Financial Solutions		Total Canada
Net premiums	$	252,723		$	11,305	$	264,028		$	215,762	$	9,410	$	225,172
Investment income, net of related expenses	50,584			115		50,699			44,506		1,044		45,550
Investment related gains (losses), net	(731		)	—		(731		)	3,843		—		3,843
Other revenues	(257		)	1,357		1,100			164		1,353		1,517
Total revenues	302,319			12,777		315,096			264,275		11,807		276,082
Benefits and expenses:
Claims and other policy benefits	212,825			9,115		221,940			191,052		7,619		198,671
Interest credited	5			—		5			4		—		4
Policy acquisition costs and other insurance expenses	57,032			96		57,128			45,682		144		45,826
Other operating expenses	8,750			375		9,125			8,209		452		8,661
Total benefits and expenses	278,612			9,586		288,198			244,947		8,215		253,162
Income before income taxes	$	23,707		$	3,191	$	26,898		$	19,328	$	3,592	$	22,920

Income before income taxes increased by $4.0 million, or 17.4%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase in income in the first three months of 2018 is primarily due to favorable traditional individual life mortality experience as compared to the same period in 2017 as well as a new in force block transaction entered into in 2018. A strengthening Canadian dollar resulted in an increase in income before income taxes of $1.6 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Traditional Reinsurance

Income before income taxes for the Canada Traditional segment increased by $4.4 million, or 22.7%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase in income before income taxes in 2018 is primarily due to favorable traditional individual life mortality experience as well as a new in force block transaction entered into in 2018. A strengthening Canadian dollar resulted in an increase in income before income taxes of $1.4 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Net premiums increased $37.0 million, or 17.1%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase in 2018 was primarily due to the aforementioned in force block transaction that increased insurance in force by $10.3 billion during the quarter. Foreign currency exchange fluctuation in the Canadian dollar resulted in an increase in net premiums of $10.8 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Net investment income increased $6.1 million, or 13.7%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase in 2018 is primarily a result of an increase in the invested asset base due to growth in underlying business volume and an increase in investment yields from a higher level of variable investment income. Additionally, foreign currency exchange fluctuation in the Canadian dollar resulted in an increase in net investment income of $2.2 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Investment related gains (losses), net decreased by $4.6 million, or 119.0%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in 2018 was primarily due to a decline in the fair market value of derivatives.

Loss ratios for this segment were 84.2% and 88.5% for the three months ended March 31, 2018 and 2017, respectively. The decrease in the loss ratio for the first quarter of 2018, as compared to the same period in 2017, is due to favorable traditional individual life mortality experience and the aforementioned in force block transaction, partially offset by unfavorable results on group business. Loss ratios for the traditional individual life mortality business were 91.3% and 102.4% for the first three months ended March 31, 2018 and 2017, respectively. Excluding creditor business, claims as a percentage of net premiums for this segment were 77.0% and 81.8% for the three months ended March 31, 2018 and 2017, respectively. Historically, the loss ratio increased primarily as the result of several large permanent level premium in force blocks assumed in 1997 and 1998. These blocks are

49

mature blocks of long-term permanent level premium business in which mortality as a percentage of net premiums is expected to be higher than historical ratios. The nature of permanent level premium policies requires the Company to set up actuarial liabilities and invest the amounts received in excess of early-year claims costs to fund claims in later years when premiums, by design, continue to be level as compared to expected increasing mortality or claim costs. As such, investment income becomes a more significant component of profitability of these in force blocks. Excluding creditor business, claims and other policy benefits, as a percentage of net premiums and investment income were 75.3% and 81.9% for the three months ended March 31, 2018 and 2017, respectively.

Policy acquisition costs and other insurance expenses as a percentage of net premiums were 22.6% and 21.2% for the three months ended March 31, 2018 and 2017, respectively. Overall, while these ratios are expected to remain in a predictable range, they may fluctuate from period to period due to varying allowance levels and product mix. In addition, the amortization patterns of previously capitalized amounts, which are subject to the form of the reinsurance agreement and the underlying insurance policies, may vary.

Other operating expenses increased by $0.5 million, or 6.6%, for the three months ended March 31, 2018, as compared to the same period in 2017. Other operating expenses as a percentage of net premiums were 3.5% and 3.8% for the three months ended March 31, 2018 and 2017, respectively.

Financial Solutions Reinsurance

Income before income taxes decreased by $0.4 million, or 11.2%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in income in the first three months was primarily due to a decrease in net investment income as a result of a decrease in the invested asset base partially offset by favorable experience on longevity business. A strengthening Canadian dollar resulted in an increase in income before income taxes of $0.2 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Net premiums increased $1.9 million, or 20.1%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase was primarily due to longevity business, where the premium structure generally increases over time. A strengthening Canadian dollar resulted in an increase in net premiums of $0.5 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Net investment income decreased $0.9 million, or 89.0%, for the three months ended March 31, 2018, as compared to the same period in 2017 primarily due to a decrease in the invested asset base.

Claims and other policy benefits increased $1.5 million, or 19.6%, for the three months ended March 31, 2018 as compared to the same period in 2017. The increase was primarily a result of normal aging of the longevity block of business.

Europe, Middle East and Africa Operations

The Europe, Middle East and Africa (“EMEA”) operations include business generated by its offices principally in the United Kingdom (“UK”), South Africa, France, Germany, Ireland, Italy, the Netherlands, Poland, Spain and the Middle East region. EMEA consists of two major segments: Traditional and Financial Solutions. The Traditional segment primarily provides reinsurance through yearly renewable term and coinsurance agreements on a variety of life, health and critical illness products. Reinsurance agreements may be facultative or automatic agreements covering primarily individual risks and, in some markets, group risks. The Financial Solutions segment consists of reinsurance and other transactions associated with longevity closed blocks, payout annuities, capital management solutions and financial reinsurance.

(dollars in thousands)	Three months ended March 31,
	2018								2017
Revenues:	Traditional		Financial Solutions			Total EMEA			Traditional		Financial Solutions		Total EMEA
Net premiums	$	375,729	$	47,979		$	423,708		$	304,672	$	41,995	$	346,667
Investment income, net of related expenses	15,764		31,932			47,696			12,720		29,681		42,401
Investment related gains (losses), net	9		3,352			3,361			7		4,575		4,582
Other revenues	2,280		4,880			7,160			687		3,738		4,425
Total revenues	393,782		88,143			481,925			318,086		79,989		398,075
Benefits and expenses:
Claims and other policy benefits	326,802		42,471			369,273			266,401		35,936		302,337
Interest credited	—		(2,652		)	(2,652		)	—		4,113		4,113
Policy acquisition costs and other insurance expenses	25,552		1,080			26,632			15,163		289		15,452
Other operating expenses	26,007		8,080			34,087			22,546		7,733		30,279
Total benefits and expenses	378,361		48,979			427,340			304,110		48,071		352,181
Income (loss) before income taxes	$	15,421	$	39,164		$	54,585		$	13,976	$	31,918	$	45,894

50

Income before income taxes increased by $8.7 million, or 18.9%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase in income before income taxes for the first three months was primarily due to foreign currency exchange fluctuations and favorable Financial Solutions performance in payout annuities. Foreign currency exchange fluctuations resulted in an increase in income before income taxes totaling $6.1 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Traditional Reinsurance

Income before income taxes increased by $1.4 million, or 10.3%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase in income before income taxes was primarily due to foreign currency exchange fluctuations while favorable experience in group and health business was offset by unfavorable individual mortality and morbidity experience. Foreign currency exchange fluctuations resulted in an increase in income before income taxes totaling $1.8 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Net premiums increased $71.1 million, or 23.3%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase in net premiums was primarily due to foreign currency exchange fluctuations as well as increased business volumes, primarily from individual mortality business in the UK and Middle East region. Foreign currency exchange fluctuations increased net premiums by $40.3 million for the three months ended March 31, 2018, as compared to the same period in 2017.

A portion of the net premiums for the segment, in each period presented, relates to reinsurance of critical illness coverage, primarily in the UK. This coverage provides a benefit in the event of the diagnosis of a pre-defined critical illness. Net premiums earned from this coverage totaled $48.9 million and $46.0 million for the first three months of 2018 and 2017, respectively.

Net investment income increased $3.0 million, or 23.9%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase for the first three months of 2018 was primarily due to an increase in the invested asset base. Foreign currency exchange fluctuation resulted in an increase in net investment income of $1.7 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Loss ratios for this segment were 87.0% and 87.4% for the three month periods ended March 31, 2018 and 2017, respectively. The slight decrease in the loss ratio for the first three months of 2018 is primarily due to changes in business mix, partially offset by slightly higher overall claim rates. Management views recent claims experience as normal short-term volatility that is inherent in the business.

Policy acquisition costs and other insurance expenses as a percentage of net premiums were 6.8% and 5.0% for the three months ended March 31, 2018 and 2017, respectively. These percentages fluctuate due to timing of client company reporting, variations in the mixture of business and the relative maturity of the business. Certain new treaties have included higher than average ceding allowances.

Other operating expenses increased $3.5 million, or 15.4%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase was primarily due to foreign currency exchange fluctuation, which resulted in an increase in operating expenses of $2.9 million for the three months ended March 31, 2018, as compared to the same period in 2017. Other operating expenses as a percentage of net premiums totaled 6.9% and 7.4% for the three months ended March 31, 2018 and 2017, respectively.

Financial Solutions Reinsurance

Income before income taxes increased by $7.2 million, or 22.7%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase in income before income taxes for the first three months was primarily due to foreign currency exchange fluctuations and favorable payout annuity and closed block longevity experience. Foreign currency exchange fluctuations resulted in an increase in income before income taxes totaling $4.3 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Net premiums increased $6.0 million, or 14.2%, for the three months ended March 31, 2018, as compared to the same period in 2017. Net premiums increased primarily due to foreign currency exchange fluctuations and increased volumes related to closed block longevity business. Foreign currency exchange fluctuations increased net premiums by $5.4 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Net investment income increased $2.3 million, or 7.6%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase was primarily due to an increase in the asset base related to new business and favorable foreign currency exchange fluctuation offset by a decrease in investment income related to unit-linked products. The effect on investment income related to unit-linked products is substantially offset by a corresponding change in interest credited. Foreign currency exchange fluctuation resulted in an increase in investment income of $3.4 million for the three months ended March 31, 2018, as compared to the same period in 2017.

51

Other revenues increased by $1.1 million, or 30.6%, for the three months ended March 31, 2018, as compared to the same period in 2017. Fees earned from this business can vary significantly depending on the size of the transactions and the timing of their completion and, therefore, can fluctuate from period to period.

Claims and other policy benefits increased $6.5 million, or 18.2%, for the three months ended March 31, 2018, as compared to the same period in 2017. An increase in claims and other policy benefits was due primarily to foreign currency exchange fluctuations and increased payout annuity business volumes. Foreign currency exchange fluctuations increased claims and other policy benefits by $4.7 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Interest credited expense decreased by $6.8 million for the three months ended March 31, 2018, as compared to the same period in 2017. Interest credited in this segment relates to amounts credited to the contractholders of unit-linked products. The effect on interest credited related to unit-linked products is substantially offset by a corresponding change in investment income.

Other operating expenses increased $0.3 million, or 4.5%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase is primarily due to foreign currency exchange fluctuation, which resulted in an increase in operating expenses of $1.0 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Asia Pacific Operations

The Asia Pacific operations include business generated by its offices principally in Australia, China, Hong Kong, India, Japan, Malaysia, New Zealand, Singapore, South Korea and Taiwan. The Traditional segment’s principal types of reinsurance include individual and group life and health, critical illness, disability and superannuation. Superannuation is the Australian government mandated compulsory retirement savings program. Superannuation funds accumulate retirement funds for employees, and, in addition, typically offer life and disability insurance coverage. The Financial Solutions segment includes financial reinsurance, asset-intensive and certain disability and life blocks. Reinsurance agreements may be facultative or automatic agreements covering primarily individual risks and in some markets, group risks.

(dollars in thousands)	Three months ended March 31,
	2018						2017
Revenues:	Traditional		Financial Solutions		Total Asia Pacific		Traditional		Financial Solutions		Total Asia Pacific
Net premiums	$	589,513	$	678	$	590,191	$	483,307	$	1,526	$	484,833
Investment income, net of related expenses	24,600		10,394		34,994		21,902		5,536		27,438
Investment related gains (losses), net	8		3,467		3,475		—		7,185		7,185
Other revenues	418		5,307		5,725		21		6,205		6,226
Total revenues	614,539		19,846		634,385		505,230		20,452		525,682
Benefits and expenses:
Claims and other policy benefits	495,194		4,468		499,662		355,439		6,495		361,934
Interest credited	—		6,394		6,394		—		2,997		2,997
Policy acquisition costs and other insurance expenses	58,782		1,197		59,979		72,857		1,917		74,774
Other operating expenses	37,676		3,766		41,442		35,246		3,171		38,417
Total benefits and expenses	591,652		15,825		607,477		463,542		14,580		478,122
Income before income taxes	$	22,887	$	4,021	$	26,908	$	41,688	$	5,872	$	47,560

Income before income taxes decreased by $20.7 million, or 43.4%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in income before income taxes for the first three months is primarily attributable to unfavorable claims experience and from new business mix. Foreign currency exchange fluctuations resulted in an increase to income before income taxes totaling $1.1 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Traditional Reinsurance

Income before income taxes decreased by $18.8 million, or 45.1%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in income before income taxes in 2018 was primarily due to unfavorable claims experience and new business mix. Foreign currency exchange fluctuations resulted in an increase to income before income taxes totaling $1.0 million for the three months ended 2018, as compared to the same period in 2017.

52

Net premiums increased by $106.2 million, or 22.0%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase for the three month period in 2018 was driven by new business written in Asian markets. Foreign currency exchange fluctuations resulted in an increase in net premiums of $21.3 million for the three months ended March 31, 2018, as compared to the same period in 2017.

A portion of the net premiums for the segment, in each period presented, relates to reinsurance of critical illness coverage. This coverage provides a benefit in the event of the diagnosis of a pre-defined critical illness. Reinsurance of critical illness in the segment is offered primarily in South Korea, Australia and Hong Kong. Net premiums earned from this coverage totaled $235.7 million and $141.9 million for the three months ended March 31, 2018 and 2017, respectively.

Net investment income increased $2.7 million, or 12.3%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase was primarily due to an increase in the invested asset base. Foreign currency exchange fluctuations resulted in an increase in net investment income of $0.8 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Loss ratios for this segment were 84.0% and 73.5% for the three months endedMarch 31, 2018 and 2017, respectively. The increase in the loss ratio for the first three months of 2018 was primarily due to unfavorable claims experience in Australia and several Asian markets. The loss ratio in 2017 reflected favorable claims experience in several markets.

Policy acquisition costs and other insurance expenses as a percentage of net premiums were 10.0% and 15.1% for the three months endedMarch 31, 2018 and 2017, respectively. The ratio of policy acquisition costs and other insurance expenses as a percentage of net premiums fluctuates periodically due to timing of client company reporting and variations in the mixture of business. The decrease in the current quarter is primarily due to the true-up of allowances based on updated client reporting.

Other operating expenses increased $2.4 million or 6.9%, for the three months ended March 31, 2018, as compared to the same period in 2017 mainly due to higher compensation and employee related expenses. Foreign currency exchange fluctuations resulted in an increase in other operating expenses of $1.4 million for the three months ended March 31, 2018, as compared to the same period in 2017. Other operating expenses as a percentage of net premiums totaled 6.4% and 7.3% for the three months endedMarch 31, 2018 and 2017, respectively. The timing of premium flows and the level of costs associated with development of new markets within the segment may cause other operating expenses as a percentage of net premiums to fluctuate from period to period.

Financial Solutions Reinsurance

Income before income taxes decreased by $1.9 million, or 31.5%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in income before income taxes is primarily attributable to a decline in investment related gains (losses) in the first three months of 2018 as compared to the same period in 2017. Foreign currency exchange fluctuations increased income before income taxes by $0.1 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Net premiums decreased $0.8 million, or 55.6%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease was primarily due to policy lapses on a closed treaty in Japan.

Net investment income increased $4.9 million, or 87.8%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase is primarily driven by growth in invested asset base from new transactions. Foreign currency exchange fluctuation resulted in an increase in net investment income of $0.2 million for the three months ended March 31, 2018, as compared to the same period in 2017.

Other revenues decreased by $0.9 million, or 14.5%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease is primarily due to foreign currency gains recorded in the first three months of 2017. As of March 31, 2018 and 2017, the amount of reinsurance assumed from client companies, as measured by pre-tax statutory surplus, risk based capital and other financial reinsurance structures was $2.6 billion and $1.5 billion, respectively. Fees earned from this business can vary significantly depending on the size of the transactions and the timing of their completion and, therefore, can fluctuate from period to period.

Claims and other policy benefits decreased by $2.0 million, or 31.2%, for the three months ended March 31, 2018, as compared to the same period in 2017. This decrease is attributable to lower lapses on the aforementioned closed treaty in Japan.

Interest credited expense increased by $3.4 million, or 113.3%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase is primarily driven by growth from new asset-intensive transactions.

Other operating expenses increased $0.6 million, or 18.8%, for the three months ended March 31, 2018, as compared to the same period in 2017. The timing of premium flows and the level of costs associated with the entrance into and development of new markets within the segment may cause other operating expenses to fluctuate from period to period.

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Corporate and Other

Corporate and Other revenues primarily include investment income from unallocated invested assets and investment related gains and losses. Corporate and Other expenses consist of the offset to capital charges allocated to the operating segments within the policy acquisition costs and other insurance income line item, unallocated overhead and executive costs, interest expense related to debt, and the investment income and expense associated with the Company’s collateral finance and securitization transactions. Additionally, Corporate and Other includes results from certain wholly-owned subsidiaries, such as RGAx, and joint ventures that, among other activities, develop and market technology, and provide consulting and outsourcing solutions for the insurance and reinsurance industry.

(dollars in thousands)	Three months ended March 31,
	2018			2017
Revenues:
Net premiums	$	10		$	44
Investment income, net of related expenses	40,146			31,163
Investment related gains (losses), net	(8,934		)	(14,823		)
Other revenues	8,033			5,168
Total revenues	39,255			21,552
Benefits and expenses:
Claims and other policy benefits	320			27
Interest credited	2,210			1,124
Policy acquisition costs and other insurance income	(30,512		)	(27,067		)
Other operating expenses	62,960			40,372
Interest expense	37,454			42,402
Collateral finance and securitization expense	7,602			6,770
Total benefits and expenses	80,034			63,628
Loss before income taxes	$	(40,779	)	$	(42,076	)

Loss before income taxes decreased by $1.3 million, or 3.1%, for the three months ended March 31, 2018, as compared to the same period in 2017. The decrease in loss before income taxes in the first quarter is primarily due to increases in investment income, investment related gains (losses), net and lower interest expense partially offset by an increase in other operating expenses.

Total revenues increased by $17.7 million, or 82.1%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase for the first three months is primarily due to increases of $9.0 million in investment income, related to an increase in unallocated invested assets and higher investment yields, as well as a $5.9 million reduction in investment related losses. The decrease in investment related losses, net was primarily caused by a $14.1 million reduction in other-than-temporary impairments on fixed maturity securities, which was offset by a $4.2 million change in fair value of equity securities and a $3.0 million increase in net losses on the sale of securities. In addition, the Company’s January 2018 acquisition of LOGiQ3 Inc., a group of companies providing technology, consulting and outsourcing solutions primarily to the North American life insurance and reinsurance industry, contributed $2.9 million to other revenues in the current quarter.

Total benefits and expenses increased by $16.4 million, or 25.8%, for the three months ended March 31, 2018, as compared to the same period in 2017. The increase in the first three months is primarily due to a $22.6 million increase in other operating expenses, offset by a decrease of $4.9 million in interest expense. The increase in operating expenses was primarily related to increased consulting expenses and compensation expense due to increased compliance costs, strategic initiatives and acquisitions. The aforementioned acquisition of LOGiQ3 Inc. contributed $4.7 million of other operating expenses in the current quarter. The decrease in interest expense was primarily due to the repayment of $300.0 million of long-term debt in 2017.

Liquidity and Capital Resources

Overview

The Company believes that cash flows from the source of funds available to it will provide sufficient cash flows for the next twelve months to satisfy the current liquidity requirements of RGA, Inc. and its subsidiaries under various scenarios that include the potential risk of early recapture of reinsurance treaties, market events and higher than expected claims. The Company performs periodic liquidity stress testing to ensure its asset portfolio includes sufficient high quality liquid assets that could be utilized to bolster its liquidity position under stress scenarios. These assets could be utilized as collateral for secured borrowing transactions with various third parties or by selling the securities in the open market if needed. The Company’s liquidity requirements have been and will continue to be funded through net cash flows from operations. However, in the event of significant unanticipated

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cash requirements beyond normal liquidity needs, the Company has multiple liquidity alternatives available based on market conditions and the amount and timing of the liquidity need. These alternatives include borrowings under committed credit facilities, secured borrowings, the ability to issue long-term debt, preferred securities or common equity and, if necessary, the sale of invested assets subject to market conditions.

Current Market Environment

The current low interest rate environment in select markets, primarily the U.S. and Canada, continues to put downward pressure on the Company's investment yield. The Company’s average investment yield, excluding spread business, for the three months ended March 31, 2018 was 4.46%, five basis points above the same period in 2017. The Company’s insurance liabilities, in particular its annuity products, are sensitive to changing market factors. Gross unrealized gains on fixed maturity securities available-for-sale decreased from $2,982.8 million at December 31, 2017 to$2,413.0 million at March 31, 2018. Similarly, gross unrealized losses increased from $113.3 million at December 31, 2017 to $381.5 million at March 31, 2018.

The Company continues to be in a position to hold any investment security showing an unrealized loss until recovery, provided it remains comfortable with the credit of the issuer. As indicated above, gross unrealized gains on fixed maturity securities of $2,413.0 million remain well in excess of gross unrealized losses of $381.5 million as of March 31, 2018. The Company does not rely on short-term funding or commercial paper and to date it has experienced no liquidity pressure, nor does it anticipate such pressure in the foreseeable future.

The Company projects its reserves to be sufficient, and it would not expect to write down deferred acquisition costs or be required to take any actions to augment capital, even if interest rates remain at current levels for the next five years, assuming all other factors remain constant. While the Company has felt the pressures of sustained low interest rates and volatile equity markets and may continue to do so, its business operations are not overly sensitive to these risks. Although management believes the Company’s current capital base is adequate to support its business at current operating levels, it continues to monitor new business opportunities and any associated new capital needs that could arise from the changing financial landscape.

The Holding Company

RGA is an insurance holding company whose primary uses of liquidity include, but are not limited to, the immediate capital needs of its operating companies, dividends paid to its shareholders, repurchase of common stock and interest payments on its indebtedness. The primary sources of RGA’s liquidity include proceeds from its capital-raising efforts, interest income on undeployed corporate investments, interest income received on surplus notes with RGA Reinsurance, RCM and Rockwood Re and dividends from operating subsidiaries. As the Company continues its expansion efforts, RGA will continue to be dependent upon these sources of liquidity. The following tables provide comparative information for RGA (dollars in thousands):

	Three months ended March 31,
	2018		2017
Interest expense	$	45,444	$	50,221
Capital contributions to subsidiaries	11,000		7,500
Dividends to shareholders	32,241		26,381
Interest and dividend income	31,547		26,073

	March 31, 2018		December 31, 2017
Cash and invested assets	$	677,956	$	779,996

See Item 15, Schedule II - “Condensed Financial Information of the Registrant” in the 2017 Annual Report for additional financial information related to RGA.

The undistributed earnings of substantially all of the Company’s foreign subsidiaries have been reinvested indefinitely in those non-U.S. operations, as described in Note 9 - “Income Tax” of the Notes to Consolidated Financial Statements in the 2017 Annual Report. As U.S. Tax Reform generally eliminates U.S. federal income taxes on dividends from foreign subsidiaries, the Company does not expect to incur material income taxes if these funds are repatriated.

RGA endeavors to maintain a capital structure that provides financial and operational flexibility to its subsidiaries, credit ratings that support its competitive position in the financial services marketplace, and shareholder returns. As part of the Company’s capital deployment strategy, it has in recent years repurchased shares of RGA common stock and paid dividends to RGA shareholders, as authorized by the board of directors. RGA’s current share repurchase program, which was approved by the board of directors in January 2017, authorizes the repurchase of up to $400.0 million of common stock. The pace of repurchase activity depends on various factors such as the level of available cash, an evaluation of the costs and benefits associated with alternative uses of excess capital, such as acquisitions and in force reinsurance transactions, and RGA’s stock price.

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In April 2018, RGA’s board of directors declared a quarterly dividend of $0.50 per share. All future payments of dividends are at the discretion of RGA’s board of directors and will depend on the Company’s earnings, capital requirements, insurance regulatory conditions, operating conditions, and other such factors as the board of directors may deem relevant. The amount of dividends that RGA can pay will depend in part on the operations of its reinsurance subsidiaries. See Note 3 - “Equity” in the Notes to Condensed Consolidated Financial Statements for information on the Company’s share repurchase program.

Debt

Certain of the Company’s debt agreements contain financial covenant restrictions related to, among others, liens, the issuance and disposition of stock of restricted subsidiaries, minimum requirements of consolidated net worth, maximum ratios of debt to capitalization and change of control provisions. The Company is required to maintain a minimum consolidated net worth, as defined in the debt agreements, of $3.5 billion, calculated as of the last day of each fiscal quarter. Also, consolidated indebtedness, calculated as of the last day of each fiscal quarter, cannot exceed 35% of the sum of the Company’s consolidated indebtedness plus adjusted consolidated stockholders’ equity. A material ongoing covenant default could require immediate payment of the amount due, including principal, under the various agreements. Additionally, the Company’s debt agreements contain cross-default covenants, which would make outstanding borrowings immediately payable in the event of a material uncured covenant default under any of the agreements, including, but not limited to, non-payment of indebtedness when due for an amount in excess of $100.0 million, bankruptcy proceedings, or any other event which results in the acceleration of the maturity of indebtedness.

As of March 31, 2018 and December 31, 2017, the Company had $2.8 billion in outstanding borrowings under its debt agreements and was in compliance with all covenants under those agreements. As of March 31, 2018 and December 31, 2017, the average interest rate on long-term debt outstanding was 5.24%. The ability of the Company to make debt principal and interest payments depends on the earnings and surplus of subsidiaries, investment earnings on undeployed capital proceeds, available liquidity at the holding company, and the Company’s ability to raise additional funds.

The Company enters into derivative agreements with counterparties that reference either the Company’s debt rating or its financial strength rating. If either rating is downgraded in the future, it could trigger certain terms in the Company’s derivative agreements, which could negatively affect overall liquidity. For the majority of the Company’s derivative agreements, there is a termination event, at the Company’s option, should the long-term senior debt ratings drop below either BBB+ (S&P) or Baa1 (Moody’s) or the financial strength ratings drop below either A- (S&P) or A3 (Moody’s).

The Company may borrow up to $850.0 million in cash and obtain letters of credit in multiple currencies on its revolving credit facility that matures in September 2019. As of March 31, 2018, the Company had no cash borrowings outstanding and $80.9 million in issued, but undrawn, letters of credit under this facility.

Based on the historic cash flows and the current financial results of the Company, management believes RGA’s cash flows will be sufficient to enable RGA to meet its obligations for at least the next 12 months.

Credit and Committed Facilities

At March 31, 2018, the Company maintained an $850.0 million syndicated revolving credit facility and certain committed letter of credit facilities aggregating $1,275.8 million. See Note 13 - “Debt” in the Notes to Consolidated Financial Statements in the 2017 Annual Report for further information about these facilities.

The Company has obtained bank letters of credit in favor of various affiliated and unaffiliated insurance companies from which the Company assumes business. These letters of credit represent guarantees of performance under the reinsurance agreements and allow ceding companies to take statutory reserve credits. Certain of these letters of credit contain financial covenant restrictions similar to those described in the “Debt” discussion above. At March 31, 2018, there were approximately $110.8 million of outstanding bank letters of credit in favor of third parties. Additionally, in accordance with applicable regulations, the Company utilizes letters of credit to secure statutory reserve credits when it retrocedes business to its affiliated subsidiaries. The Company cedes business to its affiliates to help reduce the amount of regulatory capital required in certain jurisdictions, such as the U.S. and the UK. The Company believes the capital required to support the business in the affiliates reflects more realistic expectations than the original jurisdiction of the business, where capital requirements are often considered to be quite conservative. As of March 31, 2018, $1.7 billion in letters of credit from various banks were outstanding, but undrawn, backing reinsurance between the various subsidiaries of the Company.

Cash Flows

The Company’s principal cash inflows from its reinsurance operations include premiums and deposit funds received from ceding companies. The primary liquidity concerns with respect to these cash flows are early recapture of the reinsurance contract by the ceding company and lapses of annuity products reinsured by the Company. The Company’s principal cash inflows from its invested assets result from investment income and the maturity and sales of invested assets. The primary liquidity concerns with respect

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to these cash inflows relates to the risk of default by debtors and interest rate volatility. The Company manages these risks very closely. See “Investments” and “Interest Rate Risk” below.

Additional sources of liquidity to meet unexpected cash outflows in excess of operating cash inflows and current cash and equivalents on hand include selling short-term investments or fixed maturity securities and drawing funds under a revolving credit facility, under which the Company had availability of $769.1 million as of March 31, 2018. The Company also has $1.1 billion of funds available through collateralized borrowings from the FHLB as of March 31, 2018. As of March 31, 2018, the Company could have borrowed these additional amounts without violating any of its existing debt covenants.

The Company’s principal cash outflows relate to the payment of claims liabilities, interest credited, operating expenses, income taxes, dividends to shareholders, purchases of treasury stock, and principal and interest under debt and other financing obligations. The Company seeks to limit its exposure to loss on any single insured and to recover a portion of benefits paid by ceding reinsurance to other insurance enterprises or reinsurers under excess coverage and coinsurance contracts (See Note 2, “Summary of Significant Accounting Policies” in the Notes to Consolidated Financial Statements in the 2017 Annual Report). The Company performs annual financial reviews of its retrocessionaires to evaluate financial stability and performance. The Company has never experienced a material default in connection with retrocession arrangements, nor has it experienced any difficulty in collecting claims recoverable from retrocessionaires; however, no assurance can be given as to the future performance of such retrocessionaires nor to the recoverability of future claims. The Company’s management believes its current sources of liquidity are adequate to meet its cash requirements for the next 12 months.

Summary of Primary Sources and Uses of Liquidity and Capital

The Company’s primary sources and uses of liquidity and capital are summarized as follows:

		For the three months ended March 31,
		2018			2017
		(Dollars in thousands)
Sources:
	Net cash provided by operating activities	$	223,749		$	417,365
	Exercise of stock options, net	1,163			1,719
	Change in cash collateral for derivative positions and other arrangements	19,537			—
	Cash provided by changes in universal life and other
	investment type policies and contracts	—			1,066
	Effect of exchange rate changes on cash	21,989			18,833
	Total sources	266,438			438,983
Uses:
	Net cash provided by (used in) investing activities	(76,550		)	110,967
	Dividends to stockholders	32,241			26,381
	Repayment of collateral finance and securitization notes	27,104			16,908
	Principal payments of long-term debt	662			300,636
	Purchases of treasury stock	2,616			3,067
	Change in cash collateral for derivative positions and other arrangements	—			3,628
	Cash used for changes in universal life and other
	investment type policies and contracts	73,482			—
	Total uses	59,555			461,587
Net change in cash and cash equivalents		$	206,883		$	(22,604	)

Cash Flows from Operations - The principal cash inflows from the Company’s reinsurance activities come from premiums, investment and fee income, annuity considerations and deposit funds. The principal cash outflows relate to the liabilities associated with various life and health insurance, annuity and disability products, operating expenses, income tax payments and interest on outstanding debt obligations. The primary liquidity concern with respect to these cash flows is the risk of shortfalls in premiums and investment income, particularly in periods with abnormally high claims levels.

Cash Flows from Investments - The principal cash inflows from the Company’s investment activities come from repayments of principal on invested assets, proceeds from maturities of invested assets, sales of invested assets and settlements of freestanding derivatives. The principal cash outflows relate to purchases of investments, issuances of policy loans and settlements of freestanding derivatives. The Company typically has a net cash outflow from investing activities because cash inflows from insurance operations are reinvested in accordance with its asset/liability management discipline to fund insurance liabilities. The Company closely monitors and manages these risks through its credit risk management process. The primary liquidity concerns with respect to these cash flows are the risk of default by debtors and market disruption, which could make it difficult for the Company to sell investments.

Financing Cash Flows - The principal cash inflows from the Company’s financing activities come from issuances of RGA debt and equity securities, and deposit funds associated with universal life and other investment type policies and contracts. The principal

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cash outflows come from repayments of debt, payments of dividends to stockholders, purchases of treasury stock, and withdrawals associated with universal life and other investment type policies and contracts. A primary liquidity concern with respect to these cash flows is the risk of early contractholder and policyholder withdrawal.

Contractual Obligations

There were no material changes in the Company’s contractual obligations from those reported in the 2017 Annual Report.

Asset / Liability Management

The Company actively manages its cash and invested assets using an approach that is intended to balance quality, diversification, asset/liability matching, liquidity and investment return. The goals of the investment process are to optimize after-tax, risk-adjusted investment income and after-tax, risk-adjusted total return while managing the assets and liabilities on a cash flow and duration basis.

The Company has established target asset portfolios for its operating segments, which represent the investment strategies intended to profitably fund its liabilities within acceptable risk parameters. These strategies include objectives and limits for effective duration, yield curve sensitivity and convexity, liquidity, asset sector concentration and credit quality.

The Company’s asset-intensive products are primarily supported by investments in fixed maturity securities reflected on the Company’s balance sheet and under funds withheld arrangements with the ceding company. Investment guidelines are established to structure the investment portfolio based upon the type, duration and behavior of products in the liability portfolio so as to achieve targeted levels of profitability. The Company manages the asset-intensive business to provide a targeted spread between the interest rate earned on investments and the interest rate credited to the underlying interest-sensitive contract liabilities. The Company periodically reviews models projecting different interest rate scenarios and their effect on profitability. Certain of these asset-intensive agreements, primarily in the U.S. and Latin America Financial Solutions operating segment, are generally funded by fixed maturity securities that are withheld by the ceding company.

The Company’s liquidity position (cash and cash equivalents and short-term investments) was $1,640.8 million and $1,396.8 million at March 31, 2018 and December 31, 2017, respectively. Cash and cash equivalents includes cash collateral received from derivative counterparties of $188.4 million and $185.9 million as of March 31, 2018 and December 31, 2017, respectively. This unrestricted cash collateral is included in cash and cash equivalents and the obligation to return it is included in other liabilities in the Company’s condensed consolidated balance sheets. Liquidity needs are determined from valuation analyses conducted by operational units and are driven by product portfolios. Periodic evaluations of demand liabilities and short-term liquid assets are designed to adjust specific portfolios, as well as their durations and maturities, in response to anticipated liquidity needs.

See “Securities Borrowing, Lending and Other” in Note 4 - “Investments” in the Notes to Condensed Consolidated Financial Statements for information related to the Company’s securities borrowing, lending and repurchase/reverse repurchase programs. In addition to its security agreements with third parties, certain RGA’s subsidiaries have entered into intercompany securities lending agreements to more efficiently source securities for lending to third parties and to provide for more efficient regulatory capital management.

The Company is a member of the FHLB and holds $68.9 million of FHLB common stock, which is included in other invested assets on the Company’s condensed consolidated balance sheets. Membership provides the Company access to borrowing arrangements (“advances”) and funding agreements, discussed below, with the FHLB. The Company did not have any advances from the FHLB at March 31, 2018 and December 31, 2017. The Company had no outstanding balance of advances for the first three months of 2018. The Company’s average outstanding balance of advances was $3.1 million for the first three months of 2017. Interest on advances is reflected in interest expense on the Company’s condensed consolidated statements of income.

In addition, the Company has also entered into funding agreements with the FHLB under guaranteed investment contracts whereby the Company has issued the funding agreements in exchange for cash and for which the FHLB has been granted a blanket lien on the Company’s commercial and residential mortgage-backed securities and commercial mortgage loans used to collateralize the Company’s obligations under the funding agreements. The Company maintains control over these pledged assets, and may use, commingle, encumber or dispose of any portion of the collateral as long as there is no event of default and the remaining qualified collateral is sufficient to satisfy the collateral maintenance level. The funding agreements and the related security agreements represented by this blanket lien provide that upon any event of default by the Company, the FHLB’s recovery is limited to the amount of the Company’s liability under the outstanding funding agreements. The amount of the Company’s liability for the funding agreements with the FHLB under guaranteed investment contracts was $1.4 billion at both March 31, 2018 and December 31, 2017, which is included in interest sensitive contract liabilities on the Company’s condensed consolidated balance sheets. The advances on these agreements are collateralized primarily by commercial and residential mortgage-backed securities, commercial mortgage loans, and U.S. Treasury and government agency securities. The amount of collateral exceeds the liability and is dependent on the type of assets collateralizing the guaranteed investment contracts.

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Investments

Management of Investments

The Company’s investment and derivative strategies involve matching the characteristics of its reinsurance products and other obligations and to seek to closely approximate the interest rate sensitivity of the assets with estimated interest rate sensitivity of the reinsurance liabilities. The Company achieves its income objectives through strategic and tactical asset allocations, security and derivative strategies within an asset/liability management and disciplined risk management framework. Derivative strategies are employed within the Company’s risk management framework to help manage duration, currency, and other risks in assets and/or liabilities and to replicate the credit characteristics of certain assets. For a discussion of the Company’s risk management process see “Market and Credit Risk” in the “Enterprise Risk Management” section below.

The Company’s portfolio management groups work with the Enterprise Risk Management function to develop the investment policies for the assets of the Company’s domestic and international investment portfolios. All investments held by the Company, directly or in a funds withheld at interest reinsurance arrangement, are monitored for conformance with the Company’s stated investment policy limits as well as any limits prescribed by the applicable jurisdiction’s insurance laws and regulations. See Note 4 – “Investments” in the Notes to Condensed Consolidated Financial Statements for additional information regarding the Company’s investments.

Portfolio Composition

The Company had total cash and invested assets of $53.0 billion at March 31, 2018 and December 31, 2017, as illustrated below (dollars in thousands):

	March 31, 2018		% of Total		December 31, 2017		% of Total
Fixed maturity securities, available-for-sale	$	37,945,260	71.6	%	$	38,150,820	71.9	%
Equity securities	103,983		0.2		100,152		0.2
Mortgage loans on real estate	4,437,994		8.4		4,400,533		8.3
Policy loans	1,346,930		2.5		1,357,624		2.6
Funds withheld at interest	6,005,892		11.3		6,083,388		11.5
Short-term investments	130,430		0.2		93,304		0.2
Other invested assets	1,512,147		2.9		1,505,332		2.8
Cash and cash equivalents	1,510,407		2.9		1,303,524		2.5
Total cash and invested assets	$	52,993,043	100.0	%	$	52,994,677	100.0	%

Investment Yield

The following table presents consolidated average invested assets at amortized cost, net investment income and investment yield, excluding spread related business. Spread related business is primarily associated with contracts on which the Company earns an interest rate spread between assets and liabilities. To varying degrees, fluctuations in the yield on other spread related business is generally subject to corresponding adjustments to the interest credited on the liabilities (dollars in thousands).

	Three months ended March 31,
	2018			2017			Increase/     (Decrease)
Average invested assets at amortized cost	$	27,024,934		$	25,212,377		7.2	%
Net investment income	296,473			273,208			8.5	%
Investment yield (ratio of net investment income to average invested assets)	4.46		%	4.41		%	5 bps

Investment yield increased for the three months ended March 31, 2018 in comparison to the same period in the prior year primarilydue to increased income from real estate joint ventures and limited partnership investments, which are included in other invested assets on the condensed consolidated balance sheets.

Fixed Maturity and Equity Securities Available-for-Sale

See “Fixed Maturity and Equity Securities Available-for-Sale” in Note 4 – “Investments” in the Notes to Condensed Consolidated Financial Statements for tables that provide the amortized cost, unrealized gains and losses, estimated fair value of these securities, and the other-than-temporary impairments in AOCI by sector as of March 31, 2018 and December 31, 2017.

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The Company holds various types of fixed maturity securities available-for-sale and classifies them as corporate securities (“Corporate”), Canadian and Canadian provincial government securities (“Canadian government”), residential mortgage-backed securities (“RMBS”), asset-backed securities (“ABS”), commercial mortgage-backed securities (“CMBS”), U.S. government and agencies (“U.S. government”), state and political subdivisions, and other foreign government, supranational and foreign government-sponsored enterprises (“Other foreign government”). As of March 31, 2018 and December 31, 2017, approximately 95.5% and 95.6%, respectively, of the Company’s consolidated investment portfolio of fixed maturity securities were investment grade.

Important factors in the selection of investments include diversification, quality, yield, call protection and total rate of return potential. The relative importance of these factors is determined by market conditions and the underlying reinsurance liability and existing portfolio characteristics. The largest asset class in which fixed maturity securities were invested was corporate securities, which represented approximately 61.9% and 60.9% of total fixed maturity securities as of March 31, 2018 and December 31, 2017, respectively. See “Corporate Fixed Maturity Securities” in Note 4 – “Investments” in the Notes to Condensed Consolidated Financial Statements for tables showing the major industry types, which comprise the corporate fixed maturity holdings at March 31, 2018 and December 31, 2017.

As of March 31, 2018, the Company’s investments in Canadian and Canadian provincial government securities represented 10.8% of the fair value of total fixed maturity securities compared to 11.1% of the fair value of total fixed maturities at December 31, 2017. These assets are primarily high quality, long duration provincial strips, the valuation of which is closely linked to the interest rate curve. These assets are longer in duration and held primarily for asset/liability management to meet Canadian regulatory requirements. See “Fixed Maturity Securities Available-for-Sale” in Note 4 – “Investments” in the Notes to Condensed Consolidated Financial Statements for tables showing the various sectors as of March 31, 2018 and December 31, 2017.

The Company references rating agency designations in some of its investments disclosures. These designations are based on the ratings from nationally recognized statistical rating organizations, primarily Moody’s, S&P and Fitch. Structured securities (mortgage-backed and asset-backed securities) held by the Company’s insurance subsidiaries that maintain the NAIC statutory basis of accounting utilize the NAIC rating methodology. The NAIC assigns designations to publicly traded as well as privately placed securities. The designations assigned by the NAIC range from class 1 to class 6, with designations in classes 1 and 2 generally considered investment grade (BBB or higher rating agency designation). NAIC designations in classes 3 through 6 are generally considered below investment grade (BB or lower rating agency designation).

The quality of the Company’s available-for-sale fixed maturity securities portfolio, as measured at fair value and by the percentage of fixed maturity securities invested in various ratings categories, relative to the entire available-for-sale fixed maturity security portfolio, at March 31, 2018 and December 31, 2017 was as follows (dollars in thousands):

		March 31, 2018						December 31, 2017
NAIC   Designation	Rating Agency Designation	Amortized Cost		Estimated Fair Value		% of Total		Amortized Cost		Estimated      Fair  Value		% of Total
1	AAA/AA/A	$	23,699,901	$	25,416,105	67.0	%	$	23,534,574	$	25,762,103	67.5	%
2	BBB	10,502,621		10,816,607		28.5		10,115,008		10,709,170		28.1
3	BB	1,209,542		1,211,330		3.2		1,139,200		1,173,639		3.1
4	B	439,444		439,736		1.2		408,990		420,284		1.1
5	CCC and lower	45,617		43,929		0.1		78,143		79,747		0.2
6	In or near default	16,580		17,553		—		5,497		5,877		—
	Total	$	35,913,705	$	37,945,260	100.0	%	$	35,281,412	$	38,150,820	100.0	%

The Company’s fixed maturity portfolio includes structured securities. The following table shows the types of structured securities the Company held at March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
RMBS:
Agency	$	861,908	$	861,214	$	878,559	$	896,977
Non-agency	929,099		925,934		816,567		822,903
Total RMBS	1,791,007		1,787,148		1,695,126		1,719,880
CMBS	1,281,452		1,281,933		1,285,594		1,303,387
ABS	1,727,810		1,734,722		1,634,758		1,648,362
Total	$	4,800,269	$	4,803,803	$	4,615,478	$	4,671,629

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The Company’s RMBS include agency-issued pass-through securities and collateralized mortgage obligations. A majority of the agency-issued pass-through securities are guaranteed or otherwise supported by the Federal Home Loan Mortgage Corporation, Federal National Mortgage Association, or the Government National Mortgage Association. The principal risks inherent in holding mortgage-backed securities are prepayment and extension risks, which will affect the timing of when cash will be received and are dependent on the level of mortgage interest rates. Prepayment risk is the unexpected increase in principal payments from the expected, primarily as a result of owner refinancing. Extension risk relates to the unexpected slowdown in principal payments from the expected. In addition, non-agency mortgage-backed securities face credit risk should the borrower be unable to pay the contractual interest or principal on their obligation. The Company monitors its mortgage-backed securities to mitigate exposure to the cash flow uncertainties associated with these risks.

The Company’s ABS include credit card receivables, railcar leasing, student loans, single-family rentals, home equity loans and collateralized debt obligations (primarily collateralized loan obligations). The Company owns floating rate securities that represent approximately 14.7% and 13.8% of the total fixed maturity securities at March 31, 2018 and December 31, 2017, respectively. These investments have a higher degree of income variability than the other fixed income holdings in the portfolio due to the floating rate nature of the interest payments. The Company holds these investments to match specific floating rate liabilities primarily reflected in the condensed consolidated balance sheets as collateral finance notes, as well as to enhance asset management strategies. In addition to the risks associated with floating rate securities, principal risks in holding asset-backed securities are structural, credit and capital market risks. Structural risks include the securities’ cash flow priority in the capital structure and the inherent prepayment sensitivity of the underlying collateral. Credit risks include the adequacy and ability to realize proceeds from the collateral. Credit risks are mitigated by credit enhancements which include excess spread, over-collateralization and subordination. Capital market risks include general level of interest rates and the liquidity for these securities in the marketplace.

The Company monitors its fixed maturity securities to determine impairments in value and evaluates factors such as financial condition of the issuer, payment performance, the length of time and the extent to which the market value has been below amortized cost, compliance with covenants, general market and industry sector conditions, current intent and ability to hold securities, and various other subjective factors. Based on management’s judgment, securities determined to have an other-than-temporary impairment in value are written down to fair value. See “Investments – Other-than-Temporary Impairment” in Note 2 – “Summary of Significant Accounting Policies” in the Notes to Consolidated Financial Statements in the 2017 Annual Report for additional information. The table below summarizes other-than-temporary impairments and changes in the mortgage loan provision for the three months ended March 31, 2018 and 2017 (dollars in thousands).

	Three months ended March 31,
	2018			2017
Impairment losses on fixed maturity securities	$	—		$	17,189
Other impairment losses	828			(2		)
Change in mortgage loan provision	(516		)	101
Total	$	312		$	17,288

There were no fixed maturity impairments for the three months ended March 31, 2018. The fixed maturity impairments for the three months ended March 31, 2017 were largely related to high-yield corporate securities. In addition, other impairment losses for the three months ended March 31, 2018 were primarily due to impairments on real estate joint ventures.

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At March 31, 2018 and December 31, 2017, the Company had $381.5 million and $113.3 million, respectively, of gross unrealized losses related to its fixed maturity securities. The distribution of the gross unrealized losses related to these securities is shown below.

	March 31, 2018		December 31, 2017
Sector:
Corporate	63.0	%	48.8	%
Canadian government	0.8		1.5
RMBS	7.2		10.5
ABS	2.5		4.6
CMBS	3.2		4.3
U.S. government	15.6		19.4
State and political subdivisions	2.1		3.8
Other foreign government	5.6		7.1
Total	100.0	%	100.0	%
Industry:
Finance	22.5	%	15.8	%
Asset-backed	2.5		4.6
Industrial	35.3		30.0
Mortgage-backed	10.4		14.8
Government	24.1		31.8
Utility	5.2		3.0
Total	100.0	%	100.0	%

See “Unrealized Losses for Fixed Maturity and Equity Securities Available-for-Sale” in Note 4 – “Investments” in the Notes to Condensed Consolidated Financial Statements for a table that presents the total gross unrealized losses for these securities at March 31, 2018 and December 31, 2017, respectively, where the estimated fair value had declined and remained below amortized cost by less than 20% or more than 20%.

The Company’s determination of whether a decline in value is other-than-temporary includes analysis of the underlying credit and the extent and duration of a decline in value. The Company’s credit analysis of an investment includes determining whether the issuer is current on its contractual payments, evaluating whether it is probable that the Company will be able to collect all amounts due according to the contractual terms of the security and analyzing the overall ability of the Company to recover the amortized cost of the investment. In the Company’s impairment review process, the duration and severity of an unrealized loss position for equity securities are given greater weight and consideration given the lack of contractual cash flows and the deferability features of these securities.

See “Unrealized Losses for Fixed Maturity and Equity Securities Available-for-Sale” in Note 4 – “Investments” in the Notes to Condensed Consolidated Financial Statements for tables that present the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for these securities that have estimated fair values below amortized cost, by class and grade security, as well as the length of time the related market value has remained below amortized cost as of March 31, 2018 and December 31, 2017.

As of March 31, 2018 and December 31, 2017, the Company classified approximately 5.8% and 5.9%, respectively, of its fixed maturity securities in the Level 3 category (refer to Note 6 – “Fair Value of Assets and Liabilities” in the Notes to Condensed Consolidated Financial Statements for additional information). These securities primarily consist of private placement corporate securities, bank loans, Canadian provincial strips, below investment grade mortgage-backed securities, collateralized loan obligations and subprime asset-backed securities with inactive trading markets.

See “Securities Borrowing and Other” in Note 4 - “Investments” in the Notes to Condensed Consolidated Financial Statements for information related to the Company’s securities borrowing, repurchase and repurchase/reverse repurchase programs.

Mortgage Loans on Real Estate

Mortgage loans represented approximately 8.4% and 8.3% of the Company’s cash and invested assets as of March 31, 2018 and December 31, 2017, respectively. The Company’s mortgage loan portfolio consists of U.S. and Canadian based investments primarily in commercial offices, light industrial properties and retail locations. The mortgage loan portfolio is diversified by geographic region and property type. Additional information on geographic concentration and property type can be found under “Mortgage Loans on Real Estate” in Note 4 – “Investments” in the Notes to Condensed Consolidated Financial Statements.

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As of March 31, 2018 and December 31, 2017, the Company’s mortgage loans, gross of unamortized deferred loan origination fees and expenses and valuation allowances, were distributed geographically as follows (dollars in thousands):

	March 31, 2018				December 31, 2017
	Recorded Investment		% of Total		Recorded Investment		% of Total
U.S. Region:
Pacific	$	1,266,368	28.5	%	$	1,258,753	28.6	%
South Atlantic	911,960		20.5		896,117		20.3
Mountain	662,903		14.9		694,324		15.7
East North Central	529,707		11.9		527,316		11.9
West North Central	316,837		7.1		309,326		7.0
West South Central	395,543		8.9		387,151		8.8
Middle Atlantic	156,010		3.5		137,600		3.1
East South Central	96,375		2.2		96,887		2.2
New England	5,691		0.1		5,700		0.1
Subtotal - U.S.	4,341,394		97.6		4,313,174		97.7
Canada	108,897		2.4		99,997		2.3
Total	$	4,450,291	100.0	%	$	4,413,171	100.0	%

Valuation allowances on mortgage loans are established based upon inherent losses expected by management to be realized in connection with future dispositions or settlement of mortgage loans, including foreclosures. The valuation allowances are established after management considers, among other things, the value of underlying collateral and payment capabilities of debtors. Any subsequent adjustments to the valuation allowances will be treated as investment gains or losses.

See “Mortgage Loans on Real Estate” in Note 4 – “Investments” in the Notes to Condensed Consolidated Financial Statements for information regarding valuation allowances and impairments.

Policy Loans

Policy loans comprised approximately 2.5% and 2.6% of the Company’s cash and invested assets as of March 31, 2018 and December 31, 2017, respectively, the majority of which are associated with one client. These policy loans present no credit risk because the amount of the loan cannot exceed the obligation due the ceding company upon the death of the insured or surrender of the underlying policy. The provisions of the treaties in force and the underlying policies determine the policy loan interest rates. The Company earns a spread between the interest rate earned on policy loans and the interest rate credited to corresponding liabilities.

Funds Withheld at Interest

Funds withheld at interest comprised approximately 11.3% and 11.5% of the Company’s cash and invested assets as of March 31, 2018 and December 31, 2017. For reinsurance agreements written on a modified coinsurance basis and certain agreements written on a coinsurance basis, assets equal to the net statutory reserves are withheld and legally owned and managed by the ceding company, and are reflected as funds withheld at interest on the Company’s condensed consolidated balance sheets. In the event of a ceding company’s insolvency, the Company would need to assert a claim on the assets supporting its reserve liabilities. However, the risk of loss to the Company is mitigated by its ability to offset amounts it owes the ceding company for claims or allowances against amounts owed by the ceding company. Interest accrues to the total funds withheld at interest assets at rates defined by the treaty terms. Additionally, under certain treaties the Company is subject to the investment performance on the withheld assets, although it does not directly control them. These assets are primarily fixed maturity investment securities and pose risks similar to the fixed maturity securities the Company owns. To mitigate this risk, the Company helps set the investment guidelines followed by the ceding company and monitors compliance. Ceding companies with funds withheld at interest had an average financial strength rating of “A” at March 31, 2018 and December 31, 2017. Certain ceding companies maintain segregated portfolios for the benefit of the Company.

Other Invested Assets

Other invested assets include limited partnership interests, joint ventures (other than operating joint ventures), equity release mortgages, derivative contracts, FVO contractholder-directed unit-linked investments, and FHLB common stock. Other invested assets represented approximately 2.9% and 2.8% of the Company’s cash and invested assets as of March 31, 2018 and December 31, 2017, respectively. See “Other Invested Assets” in Note 4 – “Investments” in the Notes to Condensed Consolidated Financial Statements for a table that presents the carrying value of the Company’s other invested assets by type as of March 31, 2018 and December 31, 2017.

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The Company utilizes derivative financial instruments to protect the Company against possible changes in the fair value of its investment portfolio as a result of interest rate changes, to hedge against risk of changes in the purchase price of securities, to hedge liabilities associated with the reinsurance of variable annuities with guaranteed living benefits and to manage the portfolio’s effective yield, maturity and duration. In addition, the Company utilizes derivative financial instruments to reduce the risk associated with fluctuations in foreign currency exchange rates. The Company uses both exchange-traded, centrally cleared, and customized over-the-counter derivative financial instruments.

See Note 5 - “Derivative Instruments” in the Notes to Condensed Consolidated Financial Statements for a table that presents the notional amounts and fair value of investment related derivative instruments held at March 31, 2018 and December 31, 2017.

The Company may be exposed to credit-related losses in the event of non-performance by counterparties to derivative financial instruments. Generally, the credit exposure of the Company’s derivative contracts is limited to the fair value at the reporting date plus or minus any collateral posted or held by the Company. The Company had no credit exposure related to its derivative contracts, excluding futures and mortality swaps, at March 31, 2018 and December 31, 2017, as the net amount of collateral pledged to the Company from counterparties exceeded the fair value of the derivative contracts.

The Company manages its credit risk related to over-the-counter derivatives by entering into transactions with creditworthy counterparties, maintaining collateral arrangements and through the use of master agreements that provide for a single net payment to be made by one counterparty to another at each due date and upon termination. As exchange-traded futures are affected through regulated exchanges, and positions are marked to market on a daily basis, the Company has minimal exposure to credit-related losses in the event of nonperformance by counterparties. See Note 5 - “Derivative Instruments” in the Notes to Condensed Consolidated Financial Statements for more information regarding the Company’s derivative instruments.

Enterprise Risk Management

RGA maintains a dedicated Enterprise Risk Management (“ERM”) function that is responsible for analyzing and reporting the Company’s risks on an aggregated basis; facilitating monitoring to ensure the Company’s risks remain within its appetites and limits; and ensuring, on an ongoing basis, that RGA’s ERM objectives are met. This includes ensuring proper risk controls are in place; risks are effectively identified, assessed, and managed; and key risks to which the Company is exposed are disclosed to appropriate stakeholders. The ERM function plays an important role in fostering the Company’s risk management culture and practices.

Enterprise Risk Management Structure and Governance

The Board of Directors (“the Board”) oversees enterprise risk through its standing committees. The Finance, Investments, and Risk Management (“FIRM”) Committee of the Board oversees the management of the Company’s ERM program and policies. The FIRM receives regular reports and assessments which describe the Company’s key risk exposures and include quantitative and qualitative assessments and information about breaches, exceptions, and waivers.

The Company’s Global Chief Risk Officer (“CRO”) leads the dedicated ERM function. The CRO reports to the Chief Executive Officer (“CEO”) and has direct access to the Board through the FIRM Committee with formal reporting occurring quarterly. The CRO is supported by a network of Business Unit Chief Risk Officers and Risk Management Officers throughout the business who are responsible for the analysis and management of risks within their scope. A Lead Risk Management Officer is assigned to each risk to take overall responsibility to monitor and assess the risk consistently across all markets.

In addition to leading the ERM function, the CRO also chairs the Company’s Risk Management Steering Committee (“RMSC”), which is made up of senior management executives, including the CEO, the Chief Financial Officer (“CFO”), and the Chief Operating Officer, among others. The RMSC provides oversight for the Insurance, Market and Credit, Capital, and Operational risk committees and retains direct risk oversight responsibilities for the following:

• Company’s global ERM framework, activities, and issues.

• Identification, assessments, and management of all known, new and emerging strategic risk exposures.

• Risk appetite statement, including the ongoing alignment of the risk appetite statement with the Company’s strategy and capital plans.

• Review, revise and approve RGA group-level strategic risk limits consistent with the risk appetite statement

The Insurance, Market and Credit, Capital, and Operational risk committees have direct oversight accountability for their respective risks areas including the identification, assessments, and management of known, new and emerging risk exposures and the review and approval of RGA group-level risk limits

To ensure appropriate oversight of enterprise-wide risk management issues without unnecessary duplication, as well as to foster cross-committee communication and coordination regarding risk issues, risk committee chairs attend RMSC meetings. In addition

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to the risk committees, their sub-committees and working groups, some RGA operating entities have risk management committees that oversee relevant risks related to segment-level risk limits.

Enterprise Risk Management Framework

RGA’s ERM framework provides a platform to assess the risk / return profiles of risks throughout the organization to enable enhanced decision making by business leaders. The ERM framework also guides the development and implementation of mitigation strategies to reduce exposures to these risks to acceptable levels.

RGA’s ERM framework includes the following elements:

1. Risk Culture: Risk management is an integral part of the Company’s culture and is embedded in RGA’s business processes in accordance with RGA’s risk philosophy. As the cornerstone of the ERM framework, a culture of prudent risk management reinforced by senior management plays a preeminent role in the effective management of risks assumed by RGA.

2. Risk Appetite Statement: A general and high level overview of the risk profile RGA aims to achieve to meet its strategic objectives. This statement is then supported by more granular risk limits guiding the businesses to achieve this Risk Appetite Statement.

3. Risk Limits: Risk Limits establish the maximum amount of defined risk that the Company is willing to assume to remain within the Company’s overall risk appetite. These risks have been identified by the management of the Company as relevant to manage the overall risk profile of the Company while allowing achievement of strategic objectives.

4. Risk Assessment Process: RGA uses qualitative and quantitative methods to assess key risks through a portfolio approach, which analyzes established and emerging risks in conjunction with other risks.

5. Business Specific Limits/Controls: These limits/controls provide additional safeguards against undesired risk exposures and are embedded in business processes. Examples include maximum retention limits, pricing and underwriting reviews, per issuer limits, concentration limits, and standard treaty language.

Proactive risk monitoring and reporting enable early detection and mitigation of emerging risks. The RMSC and its subcommittees monitor adherence to risk limits through the ERM function, which reports regularly to the RMSC and FIRM Committee. The frequency of monitoring is tailored to the volatility assessment and relative priority of each risk. Risk escalation channels coupled with open communication lines enhance the mitigants explained above. The Company has devoted significant resources to developing its ERM program and expects to continue to do so in the future. Nonetheless, the Company’s policies and procedures to identify, manage, and monitor risks may not be fully effective. Many of the Company’s methods for managing risk are based on historical information, which may not be a good predictor of future risk exposures, such as the risk of a pandemic causing a large number of deaths. Management of operational, legal, and regulatory risk relies on policies and procedures which may not be fully effective under all scenarios.

Risk Categories

The Company groups its risks into the following categories: Insurance risk, Market and Credit risk, Capital risk, Operational risk and Strategic risk. Specific risk assessments and descriptions can be found below and in Item 1A – “Risk Factors” of the 2017 Annual Report.

Insurance Risk

Insurance risk is the risk of lower or negative earnings and potentially a reduction in enterprise value due to a greater amount of benefits and related expenses paid than expected, or from non-market related adverse policyholder or client behavior. The Company uses multiple approaches to managing insurance risk: active insurance risk assessment and pricing appropriately for the risks assumed, transferring undesired risks, and managing the retained exposure prudently. These strategies are explained below.

Insurance Risk Assessment and Pricing

The Company has developed extensive expertise in assessing insurance risks which ultimately forms an integral part of ensuring that it is compensated commensurately for the risks it assumes and that it does not overpay for the risks it transfers to third parties. This expertise includes a vast array of market and product knowledge supported by a large information database of historical experience which is closely monitored. Analysis and experience studies derived from this database help form the basis for the Company’s pricing assumptions which are used in developing rates for new risks. If actual mortality or morbidity experience is materially adverse, some reinsurance treaties allow for increases to future premium rates.

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Misestimation of any key risk can threaten the long term viability of the enterprise. Further, the pricing process is a key operational risk and significant effort is applied to ensuring the appropriateness of pricing assumptions. Some of the safeguards the Company uses to ensure proper pricing are: experience studies, strict underwriting, sensitivity and scenario testing, pricing guidelines and controls, authority limits and internal and external pricing reviews. In addition, the ERM function provides pricing oversight which includes periodic pricing audits.

Risk Transfer

To minimize volatility in financial results and reduce the impact of large losses, the Company transfers some of its insurance risk to third parties using vehicles such as retrocession and catastrophe coverage.

Individual Exposure Retrocession

In the normal course of business, the Company seeks to limit its exposure to loss on any single insured and to recover a portion of claims paid by ceding reinsurance to other insurance enterprises (or retrocessionaires) under excess coverage and coinsurance contracts. In individual life markets, the Company retains a maximum of $8.0 million of coverage per individual life. In certain limited situations the Company has retained more than $8.0 million per individual life. The Company enters into agreements with other reinsurers to mitigate the residual risk related to the over-retained policies. Additionally, due to some lower face amount reinsurance coverages provided by the Company in addition to individual life, such as group life, disability and health, under certain circumstances, the Company could potentially incur claims totaling more than $8.0 million per individual life.

Catastrophic Excess Loss Retrocession

The Company seeks to limit its exposure to loss on its assumed catastrophic excess of loss reinsurance agreements by ceding a portion of its exposure to multiple retrocessionaires through retrocession line slips or directly to retrocession markets. The Company’s policy is to retain a maximum of $20.0 million of catastrophic loss exposure per agreement and to retrocede up to $30.0 million additional loss exposures to the retrocession markets. The Company limits its exposure on a country-by-country (and state-by-state in the U.S.) basis by managing its total exposure to all catastrophic excess of loss agreements bound within a given country to established maximum aggregate exposures. The maximum exposures are established and managed both on gross amounts issued prior to including retrocession and for amounts net of exposures retroceded.

Catastrophe Coverage

The Company accesses the markets each year for annual catastrophic coverages and reviews current coverage and pricing of current and alternate designs. The coverage may vary from year to year based on the Company’s perceived value of such protection. The current policy covers events involving 8 or more insured deaths from a single occurrence and covers $100.0 million of claims in excess of the Company’s $25.0 million deductible.

Managing Retained Exposure

The Company retains most of the inbound insurance risk. The Company manages the retained exposure proactively using various mitigating factors such as diversification and limits. Diversification is the primary mitigating factor of short term volatility risk, but it also mitigates adverse impacts of changes in long term trends and catastrophic events. The Company’s insured populations are dispersed globally, diversifying the insurance exposure because factors that cause actual experience to deviate materially from expectations do not affect all areas uniformly and synchronously or in close sequence. A variety of limits mitigate retained insurance risk. Examples of these limits include geographic exposure limits, which set the maximum amount of business that can be written in a given country, and jumbo limits, which prevent excessive coverage on a given individual.

In the event that mortality or morbidity experience develops in excess of expectations, some reinsurance treaties allow for increases to future premium rates. Other treaties include experience refund provisions, which may also help reduce RGA’s mortality risk.

RGA has various methods to manage its insurance risks, including access to the capital and reinsurance markets.

Market and Credit Risk

Market and Credit risk is the risk of lower or negative earnings and potentially a reduction in enterprise value due to changes in the market prices of asset and liabilities.

Interest Rate Risk

Interest Rate risk is risk that changes in the level and volatility of nominal interest rates affect the profitability, value or solvency position of the Company. This includes credit spread changes and inflation but excludes credit quality deterioration. This risk arises from many of the Company’s primary activities, as the Company invests substantial funds in interest-sensitive assets, primarily fixed maturity securities, and also has certain interest-sensitive contract liabilities. A prolonged period where market yields are significantly below the book yields of the Company’s asset portfolio puts downward pressure on portfolio book yields.

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The Company has been proactive in its investment strategies, reinsurance structures and overall asset-liability management practices to reduce the risk of unfavorable consequences in this type of environment.

The Company manages interest rate risk to optimize the return on the Company’s capital and to preserve the value created by its business operations within certain constraints. For example, certain management and monitoring processes are designed to minimize the effect of sudden and/or sustained changes in interest rates on fair value, cash flows, and net interest income. The Company manages its exposure to interest rates principally by managing the relative matching of the cash flows of its liabilities and assets.

The Company’s exposure to interest rate price risk and interest rate cash flow risk is reviewed on a quarterly basis. Interest rate price risk exposure is measured using interest rate sensitivity analysis to determine the change in fair value of the Company’s financial instruments in the event of a hypothetical change in interest rates. Interest rate cash flow risk exposure is measured using interest rate sensitivity analysis to determine the Company’s variability in cash flows in the event of a hypothetical change in interest rates.

In order to reduce the exposure to changes in fair values from interest rate fluctuations, the Company has developed strategies to manage the net interest rate sensitivity of its assets and liabilities. In addition, from time to time, the Company has utilized the swap market to manage the sensitivity of fair values to interest rate fluctuations.

Inflation can also have direct effects on the Company’s assets and liabilities. The primary direct effect of inflation is the increase in operating expenses. A large portion of the Company’s operating expenses consists of salaries, which are subject to wage increases at least partly affected by the rate of inflation.

The Company reinsures annuities with benefits indexed to the cost of living. Some of these benefits are hedged with a combination of CPI swaps and indexed bonds when material.

Long Term Care products have an inflation component linked to the future cost of such services. If health care costs increase at a much larger rate than what is prevalent in the nominal interest rates available in the markets, the Company may not earn enough investment yield to pay future claims on such products.

Foreign Currency Risk

Foreign currency risk is the risk of changes in level and volatility of currency exchange rates affect the profitability, value or solvency position of the Company. The Company manages its exposure to currency principally by currency matching invested assets with the underlying liabilities to the extent possible. The Company has in place net investment hedges for a portion of its investments in its Canadian operations to reduce excess exposure to these currencies. Translation differences resulting from translating foreign subsidiary balances to U.S. dollars are reflected in stockholders’ equity on the condensed consolidated balance sheets.

The Company generally does not hedge the foreign currency exposure of its subsidiaries transacting business in currencies other than their functional currency (transaction exposure). However, the Company has entered into cross currency swaps to manage exposure to specific currencies. The majority of the Company’s foreign currency transactions are denominated in Australian dollars, British pounds, Canadian dollars, Euros, Japanese yen, Korean won, and the South African rand. The maximum amount of assets held in a specific currency (with the exception of the U.S. dollar) is measured relative to risk targets and is monitored regularly.

Real Estate Risk

Real Estate risk is the risk that changes in the level and volatility of real estate market valuations may impact the profitability, value or solvency position of the Company. The Company has investments in direct real estate equity and debt instruments collateralized by real estate (“real estate loans”). Real estate equity risks include significant reduction in valuations, which could be caused by downturns in the broad economy or in specific geographic regions or sectors. In addition, real estate loan risks include defaults, borrower or tenant bankruptcy and reduced liquidity. Real estate loan risks are partially mitigated by the excess of the value of the property over the loan principle, which provides a buffer should the value of the real estate decrease. The Company manages its real estate loan risk by diversifying by property type and geography and through exposure limits.

Equity Risk

Equity risk is the risk that changes in the level and volatility of equity market valuations affect the profitability, value or solvency position of the Company. This risk includes Variable Annuity and other equity linked exposures and asset related equity exposure. The Company assumes equity risk from alternative investments, fixed indexed annuities and variable annuities. The Company uses derivatives to hedge its exposure to movements in equity markets that have a direct correlation with certain of its reinsurance products.

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Alternative Investments

Alternative investments are investments in non-traditional asset classes that primarily back the Company’s capital and surplus. The Company generally restricts the alternative investments portfolio to non-liability supporting assets: that is, free surplus. Alternative investments generally encompass: hedge funds, emerging markets debt, distressed debt, commodities, infrastructure, tax credits, and equities, both public and private. The Company mitigates its exposure to alternative investments by limiting the size of the alternative investments holding and using per-issuer investment limits.

Fixed Indexed Annuities

The Company reinsures fixed indexed annuities (“FIAs”). Credits for FIAs are affected by changes in equity markets. Thus the fair value of the benefit is primarily a function of index returns and volatility. The Company hedges most of the underlying FIA equity exposure with derivatives.

Variable Annuities

The Company reinsures variable annuities including those with guaranteed minimum death benefits (“GMDB”), guaranteed minimum income benefits (“GMIB”), guaranteed minimum accumulation benefits (“GMAB”) and guaranteed minimum withdrawal benefits (“GMWB”). Strong equity markets, increases in interest rates and decreases in equity market volatility will generally decrease the fair value of the liabilities underlying the benefits. Conversely, a decrease in the equity markets along with a decrease in interest rates and an increase in equity market volatility will generally result in an increase in the fair value of the liabilities underlying the benefits, which has the effect of increasing reserves and lowering earnings. The Company maintains a customized dynamic hedging program that is designed to substantially mitigate the risks associated with income volatility around the change in reserves on guaranteed benefits, ignoring the Company’s own credit risk assessment. However, the hedge positions may not fully offset the changes in the carrying value of the guarantees due to, among other things, time lags, high levels of volatility in the equity and derivative markets, extreme swings in interest rates, unexpected contract holder behavior, and divergence between the performance of the underlying funds and hedging indices. These factors, individually or collectively, may have a material adverse effect on the Company’s net income, financial condition or liquidity. The table below provides a summary of variable annuity account values and the fair value of the guaranteed benefits as of March 31, 2018 and December 31, 2017.

(dollars in millions)	March 31, 2018		December 31, 2017
No guarantee minimum benefits	$	890	$	950
GMDB only	178		182
GMIB only	23		24
GMAB only	16		22
GMWB only	1,299		1,366
GMDB / WB	327		343
Other	28		31
Total variable annuity account values	$	2,761	$	2,918
Fair value of liabilities associated with living benefit riders	$	138	$	152

Credit Risk

Credit risk, which includes default risk, is risk of loss due to credit quality deterioration of an individual financial asset, derivative or non-derivative contract or instrument. Credit quality deterioration may or may not be accompanied by a ratings downgrade. Generally, the credit exposure for an asset is limited to the fair value, net of any collateral received, at the reporting date.

Investment Credit Risk

Investment credit risk is credit risk related to invested assets. The Company manages investment credit risk using per-issuer investment limits. In addition to per-issuer limits, the Company also limits the total amounts of investments per rating category. An automated compliance system checks for compliance for all investment positions and sends warning messages when there is a breach. The Company manages its credit risk related to over-the-counter derivatives by entering into transactions with creditworthy counterparties, maintaining collateral arrangements and through the use of master agreements that provide for a single net payment to be made by one counterparty to another at each due date and upon termination. Because futures are transacted through regulated exchanges, and positions are marked to market on a daily basis, the Company has minimal exposure to credit-related losses in the event of nonperformance by counterparties to such derivative instruments.

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The Company enters into various collateral arrangements, which require both the posting and accepting of collateral in connection with its derivative instruments. Collateral agreements contain attachment thresholds that vary depending on the posting party’s financial strength ratings. Additionally, a decrease in the Company’s financial strength rating to a specified level results in potential settlement of the derivative positions under the Company’s agreements with its counterparties. A committee is responsible for setting rules and approving and overseeing all transactions requiring collateral. See “Credit Risk” in Note 5 – “Derivative Instruments” in the Notes to Condensed Consolidated Financial Statements for additional information on credit risk related to derivatives.

Counterparty Risk

Counterparty risk is the potential for the Company to incur losses due to a client, retrocessionaire, or partner becoming distressed or insolvent. This includes run-on-the-bank risk and collection risk.

Run-on-the-Bank

The risk that a client’s in force block incurs substantial surrenders and/or lapses due to credit impairment, reputation damage or other market changes affecting the counterparty. Substantially higher than expected surrenders and/or lapses could result in inadequate in force business to recover cash paid out for acquisition costs.

Collection Risk

For clients and retrocessionaires, this includes their inability to satisfy a reinsurance agreement because the right of offset is disallowed by the receivership court; the reinsurance contract is rejected by the receiver, resulting in a premature termination of the contract; and/or the security supporting the transaction becomes unavailable to RGA.

The Company manages counterparty risk by limiting the total exposure to a single counterparty and by only initiating contracts with creditworthy counterparties. In addition, some of the counterparties have set up trusts and letters of credit, reducing the Company’s exposure to these counterparties.

Generally, RGA’s insurance subsidiaries retrocede amounts in excess of their retention to certain other RGA insurance subsidiaries. External retrocessions are arranged through the Company’s retrocession pools for amounts in excess of its retention. As of March 31, 2018, all retrocession pool members in this excess retention pool rated by the A.M. Best Company were rated “A-” or better. A rating of “A-” is the fourth highest rating out of sixteen possible ratings. For a majority of the retrocessionaires that were not rated, letters of credit or trust assets have been given as additional security. In addition, the Company performs annual financial and in force reviews of its retrocessionaires to evaluate financial stability and performance.

The Company has never experienced a material default in connection with retrocession arrangements, nor has it experienced any material difficulty in collecting claims recoverable from retrocessionaires; however, no assurance can be given as to the future performance of such retrocessionaires or as to the recoverability of any such claims.

Aggregate Counterparty Limits

In addition to investment credit limits and counterparty limits, there are aggregate counterparty risk limits which include counterparty exposures from reinsurance, financing and investment activities at an aggregated level to control total exposure to a single counterparty. Counterparty risk aggregation is important because it enables the Company to capture risk exposures at a comprehensive level and under more extreme circumstances compared to analyzing the components individually.

All counterparty exposures are calculated on a quarterly basis, reviewed by management and monitored by the ERM function.

Capital Risk

Capital risk is the risk of lower/negative earnings, potential reduction in enterprise value, and/or the loss of ability to conduct business due to insufficient financial capacity, including not having the appropriate amount of group or entity-level capital to conduct business today or in the future. The Company monitors capital risk exposure using relevant bases of measurement including but not limited to economic, rating agency, and local regulatory methodologies. Additionally, the Company regularly assesses risk related to collateral, financing, liquidity and tax.

Collateral Risk

Collateral risk is the risk that collateral will not be available at expected costs or in the capacity required to meet current and future needs. The Company monitors risks related to interest rate movement, collateral requirements and position and capital markets environment. Collateral demands and resources continue to be actively managed with available collateral sources being more than sufficient to cover stress level collateral demands.

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Financing Risk

Financing risk is the risk that capital will not be available at expected costs or in the capacity required. The Company continues to monitor financing risks related to regulatory financing, contingency financing, and debt capital and sees no immediate issues with its current structures, capacity and plans.

Liquidity Risk

Liquidity risk is the risk that the Company is unable to meet payment obligations at expected costs or in the capacity required. The Company’s traditional liquidity demands include items such as claims, expenses, debt financing and investment purchases which are largely known or can be reasonably forecasted. The Company regularly performs liquidity risk modeling, including both market and Company specific stresses, to assess the sufficiency of available resources.

Tax Risk

Tax risk is the risk that current and future tax positions are different than expected. The Company monitors tax risks related to the evolving tax and regulatory environment, business transactions, legal entity reorganizations, tax compliance obligations, and financial reporting.

Operational Risk

Operational risk is the risk of lower/negative earnings and a potential reduction in enterprise value caused by unexpected losses associated with inadequacy or failure on the part of internal processes, people and systems, or from external events.  The Company regularly monitors and assesses the risks related to business conduct and governance, fraud, privacy and security, business disruption, and business operations. Various insurance, market and credit, capital, and strategy risk obligations and concerns often intersect with the Company’s core operational process risk areas.  Given the scope of the Company’s business and the number of countries in which it operates, this set of risks has the potential to affect the business locally, regionally, or globally. Operational risks are core to managing the Company’s brand and market confidence as well as maintaining its ability to acquire and retain the appropriate expertise to execute and operate the business.

Business Conduct and Governance

Business conduct and governance is the risk related to management oversight, compliance, market conduct, and legal matters. The Company’s Compliance Risk Management Program facilitates a proactive evaluation of present and potential compliance risks associated with both local and enterprise-wide regulatory requirements as well as compliance with Company policies and procedures.

Fraud Risk

Fraud risk is the risk related to the deliberate abuse of and/or taking of Company assets in order to secure gain for the perpetrator or inflict harm on the Company or other victim. Ongoing monitoring and an annual fraud risk assessment enables the Company to continually evaluate potential fraud risks within the organization. 

Privacy and Security Risk

Privacy and security risk is the risk of theft, loss, or unauthorized disclosure of physical or electronic assets resulting in a loss of asset value, confidentiality, or intellectual property. The Company’s privacy and security programs, processes, and procedures are designed to prevent unauthorized physical and electronic theft and the disclosure of confidential and personal data related to its customers, insured individuals or its employees. The Company employs technology, administrative related processes and procedural controls, security measures and other preventative actions to reduce the risk of such incidents.

Business Disruption Risk

Business disruption risk is the risk of impairment to operational capabilities due to the unavailability of people, systems, and/or facilities. The Company’s global business continuity process enables associates to identify potential impacts that threaten operations by providing the framework, policies and procedures and required recurring training for how the Company will recover and restore interrupted critical functions, within a predetermined time, after a disaster or extended disruption, until its normal facilities are restored.

Business Operations Risk

Business operations risk is the risk related to business processes and procedures. Business operations risk includes risk associated with the processing of transactions, data use and management, monitoring and reporting, the integrity and accuracy of models and the use of third party and advisory services.

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Human Capital Risk

Human capital risk is related to workforce management, including talent acquisition, development, retention, and employment relations/regulations. The Company actively monitors human capital risks using multiple practices which include but are not limited to human resource and compliance policies and procedures, regularly reviewing key risk indicators, performance evaluations, compensation and benefits benchmarking, succession planning, employee engagement surveys and associate exit interviews.

Strategic Risk

Strategic risk relates to the planning, implementation, and management of the Company’s business plans and strategies, including the risks associated with: the global environment in which it operates; future law and regulation changes; political risks; and relationships with key external parties.

Strategy Risk

Strategy risk is the risk related to the design and execution of the Company’s strategic plan, including risks associated with merger and acquisition activity. Strategy risks are addressed by a multi-year planning process, regular business unit level assessments of strategy execution and active benchmarking of key performance and risk indicators across the Company’s portfolios of businesses. The Company’s risk appetites and limits are set consistently with strategic objectives.

External Environment Risk

External environment risk relates to external competition, macro trends, and client needs. Macro characteristics that drive market opportunities, risk and growth potential, the competitive landscape and client feedback are closely monitored.

Key Relationships Risk

Key relationships risk relates to areas of important interactions with parties external to the Company. The Company’s reputation is a critical asset in successfully conducting business and therefore relationships with its primary stakeholders (including but not limited to business partners, shareholders, clients, rating agencies, and regulators) are all carefully monitored.

Political and Regulatory Risk

Political and regulatory risk relates to future law and regulation changes and the impact of political changes or instability on the Company’s ability to achieve its objectives. Regulatory and political developments and related risks that may affect the Company are identified, assessed and monitored as part of regular oversight activities.

New Accounting Standards

See Note 12 — “New Accounting Standards” in the Notes to Condensed Consolidated Financial Statements.

ITEM 3.  Quantitative and Qualitative Disclosures About Market Risk

There has been no significant change in the Company’s quantitative or qualitative aspects of market risk during the quarter ended March 31, 2018 from that disclosed in the 2017 Annual Report. See “Item 2 – Management’s Discussion and Analysis of Financial Condition and Results of Operations – Market and Credit Risk”, which is included herein, for additional information.

ITEM 4.  Controls and Procedures

The Chief Executive Officer and the Chief Financial Officer have evaluated the effectiveness of the design and operation of the Company’s disclosure controls and procedures as defined in Exchange Act Rule 13a-15(e) as of the end of the period covered by this report. Based on that evaluation, the Chief Executive Officer and the Chief Financial Officer concluded that these disclosure controls and procedures were effective.

There was no change in the Company’s internal control over financial reporting as defined in Exchange Act Rule 13a-15(f) during the quarter ended March 31, 2018, that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II - OTHER INFORMATION

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ITEM 1.  Legal Proceedings

The Company is subject to litigation in the normal course of its business. The Company currently has no material litigation. A legal reserve is established when the Company is notified of an arbitration demand or litigation or is notified that an arbitration demand or litigation is imminent, it is probable that the Company will incur a loss as a result and the amount of the probable loss is reasonably capable of being estimated.

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ITEM 1A.  Risk Factors

There were no material changes from the risk factors disclosed in the 2017 Annual Report.

ITEM 2.  Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchases of Equity Securities

The following table summarizes RGA’s repurchase activity of its common stock during the quarter ended March 31, 2018:

	Total Number of Shares Purchased (1)	Average Price Paid per    Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (1)	Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under the Plan or Program
January 1, 2018 - January 31, 2018	12,549	$	161.74	—	$	373,103,074
February 1, 2018 - February 28, 2018	3,140	$	153.35	—	$	373,103,074
March 1, 2018 - March 31, 2018	662	$	158.64	—	$	373,103,074

(1) RGA had no repurchases of common stock under its share repurchase program during January, February and March 2018. The Company net settled certain equity incentive awards - issuing 33,712, 8,812 and 3,929 shares from treasury and repurchasing from recipients 12,549, 3,140 and 662 shares in January, February and March, respectively, in settlement of income tax withholding requirements incurred by the recipients of such equity incentive awards.

On January 26, 2017, RGA’s board of directors authorized a share repurchase program, with no expiration date, for up to $400.0 million of RGA’s outstanding common stock.

ITEM 6.  Exhibits

See index to exhibits.

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INDEX TO EXHIBITS

Exhibit Number	Description
3.1	Amended and Restated Articles of Incorporation, incorporated by reference to Exhibit 3.1 of Current Report on Form 8-K filed November 25, 2008
3.2	Amended and Restated Bylaws, incorporated by reference to Exhibit 3.1 of Current Report on Form 8-K filed July 18, 2014
10.1	Form of Performance Contingent Share Agreement under RGA Flexible Stock Plan, as amended and restated effective May 23, 2017*
10.2	Form of Stock Appreciation Right Award Agreement under RGA Flexible Stock Plan, as amended and restated effective May 23, 2017*
31.1	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 302 of the Sarbanes-Oxley Act of 2002
31.2	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 302 of the Sarbanes-Oxley Act of 2002
32.1	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002
32.2	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document

* Represents a management contract or compensatory plan or arrangement

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Reinsurance Group of America, Incorporated
Date: May 4, 2018	By:	/s/ Anna Manning
		Anna Manning
		President & Chief Executive Officer
		(Principal Executive Officer)
Date: May 4, 2018	By:	/s/ Todd C. Larson
		Todd C. Larson
		Senior Executive Vice President & Chief Financial Officer
		(Principal Financial and Accounting Officer)

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EX-10.1

Exhibit 10.1

REINSURANCE GROUP OF AMERICA, INCORPORATED

FLEXIBLE STOCK PLAN

PERFORMANCE CONTINGENT SHARE AGREEMENT

Reinsurance Group of America, Incorporated, a Missouri corporation (the “Company”), and ____________ (“Employee”), hereby agree as follows:

SECTION 1

GRANT OF PERFORMANCE SHARES

Pursuant to the Reinsurance Group of America, Incorporated Flexible Stock Plan, as amended and restated effective May 23, 2017 (the “Plan”), and pursuant to action of the Committee charged with the Plan’s administration, the Company has granted to Employee, effective ____________ (the “Date of Grant”), subject to the terms, conditions and limitations stated in this Performance Contingent Share Agreement (this “Agreement”), the Plan and the Company’s Executive Compensation Recoupment Policy (as discussed in Section 6(c)), an award of performance contingent shares with respect to ________ shares of Common Stock (“Shares”). The performance contingent shares awarded to Employee in this Agreement are referred to herein as “Performance Shares.” The number of Performance Shares granted under this Section 1 is referred to in this Agreement as the “Target Grant.”

SECTION 2

TERMS OF GRANT

(a)Performance Period. The performance period for this award is the three (3) year period beginning January 1 of the year of grant, and ending December 31 of the second year following the year of grant (i.e., year 3) (the “Performance Period”).

(b)Payment.

(1)Performance Shares Payable In Common Stock. Subject to early termination of this Agreement pursuant to Sections 4(b) or 5 below, as soon as practicable following the end of the Performance Period, the Company shall determine the Three-Year Operating Return on Adjusted Stockholders’ Equity (as defined in Section 3(c)), Adjusted Book Value per Share (as defined in Section 3(d)) and Cumulative Three-Year Adjusted Operating Income (as defined in Section 3(e)) over such Performance Period. On or after January 1 but no later than December 31 following the last day of the Performance Period, the Company will deliver to Employee one (1) Share of the Company’s Common Stock for each Performance Share earned under this Agreement; provided, however, that any fractional Performance Share shall be paid in cash equal to such fraction of the Fair Market Value of a Share of Common Stock on the date of payment.

(2)Dividend Equivalents. Performance Shares shall not include dividend equivalent payments or dividend credit rights.

SECTION 3

PERFORMANCE CRITERIA AND ADJUSTMENTS

(a)Performance Criteria. The measures and weights for the grant of Performance Shares subject to this Agreement are set forth in a memorandum provided to Employee by the Company.

(b)Adjustment of Target Grant. The Target Grant will be adjusted at the end of the Performance Period as follows:

(1)Thirty-three and one-half percent (33.5%) of the number of Performance Shares in the Target Grant will increase or decrease based upon the Company’s Three-Year Operating Return on Adjusted Stockholders’ Equity over the Performance Period;

(2)Thirty-three percent (33%) of the number of Performance Shares in the Target Grant will increase or decrease based upon the Company’s Adjusted Book Value per Share over the Performance Period; and

(3)Thirty-three and one-half percent (33.5%) of the number of Performance Shares in the Target Grant will increase or decrease based upon the Company’s Cumulative Three-Year Adjusted Operating Income over the Performance Period.

In no event will Employee be entitled to receive a total number of Shares with respect to Performance Shares in excess of 200% of the Target Grant, even if the Company’s Three-Year Operating Return on Adjusted Stockholders’ Equity, Adjusted Book Value per Share, or Cumulative Three-Year Adjusted Operating Income during the Performance Period exceeds the maximum percentages established for any such measure.

(c)Three-Year Operating Return on Adjusted Stockholders’ Equity. “Three-Year Operating Return on Adjusted Stockholders’ Equity” for the Performance Period is the cumulative adjusted operating income for the three-year Performance Period divided by average adjusted stockholders’ equity. Adjusted stockholders’ equity represents total stockholders’ equity excluding accumulated other comprehensive income. The average of adjusted stockholders’ equity will use monthly data points during the three-year measurement period. Three-Year Operating Return on Adjusted Stockholders’ Equity, adjusted operating income and stockholders’ equity excluding accumulated other comprehensive income are non-GAAP financial measures.

(d)Adjusted Book Value per Share. “Adjusted Book Value per Share” for the three-year Performance Period is the Company’s adjusted stockholders’ equity divided by the end of period outstanding shares of Common Stock. Adjusted Book Value per Share and stockholders’ equity excluding accumulated other comprehensive income are non-GAAP financial measures.

(e)Cumulative Three-Year Adjusted Operating Income. “Cumulative Three-Year Adjusted Operating Income” for the three-year Performance Period is the net income excluding substantially all of the after-tax effects of net investment related gains and losses, changes in the fair value of certain embedded derivatives and related deferred acquisition costs, any net gain or loss from discontinued operations, the cumulative effect of any accounting changes occurring after the targets have been established, and other items that management and the Committee believe are not indicative of the Company’s ongoing operations. Cumulative Three-Year Adjusted Operating Income is a non-GAAP financial measure. The definition of adjusted operating income can vary by company and is not considered a substitute for GAAP net income.

SECTION 4

CONDITIONS AND LIMITATIONS ON RIGHT TO RECEIVE

PERFORMANCE SHARES OR COMMON SHARES

(a)Demotion or Transfer. In the event that Employee is demoted or transferred to a position with the Company or any of its Affiliates in which Employee is not eligible to participate in the Plan prior to the expiration of the Performance Period, as determined by the Committee in its sole discretion, this Agreement will terminate and be of no further force or effect and the Performance Shares awarded to Employee hereunder shall be forfeited.

(b)Termination of Employment.

(1)Death, Disability or Retirement. If Employee ceases to be employed by the Company or any of its Affiliates prior to the expiration of the Performance Period due to death, Disability or Retirement, Employee (or, in the event of Employee’s death, the legal representative of Employee’s estate or revocable living trust) shall receive a pro rata proportion of the Shares that would have been issued to Employee under this Agreement, determined by multiplying such Shares by a fraction, the numerator of which is the number of calendar months in the Performance Period during which Employee’s employment continued, and the denominator of which is the number of months in the Performance Period. Such pro rata proportion shall be paid to Employee (or, in the event of Employee’s death, the legal representative of Employee’s estate or revocable living trust) at the same time and in the same manner as specified in Section 2(b) above. Employment for any portion of a calendar month shall be deemed employment for that calendar month. For purposes of this Agreement, (i) “Disability” shall mean disability as defined in any long-term disability plan maintained by the Company or an Affiliate which covers Employee or, in the absence of any such plan, the physical or mental condition of Employee arising during the Performance Period, which in the opinion of a qualified physician chosen by the Company prevents Employee from continuing employment with the Company and its Affiliates, and (ii) “Retirement” shall mean termination of employment with the Company and its Affiliates after Employee has attained a combination of age and years of service that equals at least sixty-five (65); provided that, the maximum number of years of service credited for purposes of this calculation shall be ten (10).

(2)Other Termination. In the event that Employee’s employment with the Company and its Affiliates is terminated prior to payment of the Shares as specified in Section 2(b) above, whether voluntarily or involuntarily, for any reason other than death, Disability or Retirement, this Agreement will terminate and be of no further force or effect and the Performance Shares awarded to Employee hereunder shall be forfeited, unless otherwise determined by the Committee in its sole discretion.

SECTION 5

CHANGE OF CONTROL

Notwithstanding anything herein to the contrary, in the event a Change of Control occurs during the Performance Period prior to Employee’s death, Disability, Retirement or other termination of employment, the Three-Year Operating Return on Adjusted Stockholders’ Equity, Adjusted Book Value per Share and Cumulative Three-Year Adjusted Operating Income shall be deemed to be the respective Target Grant amounts referenced in Section 3(a). Section 4(b)(2) shall not apply in the case of involuntary termination of Employee’s employment by the Company or an Affiliate following a Change of Control other than for cause. The number of Shares determined in accordance with Sections 1 and 3(a) (and, in the event of Employee’s death, Disability or Retirement prior to the end of the Performance Period, Section 4(b)) shall be delivered to Employee (or, in the event of Employee’s death, the legal representative of Employee’s estate or revocable living trust) at the same time and in the same manner as specified in Section 2(b) above. For purposes of this Section, “cause” shall mean (a) any conduct, act or omission that is contrary to Employee’s duties as an officer or employee of the Company or any of its Affiliates, or that is inimical or in any way contrary to the best interests of the Company or any of its Affiliates, or (b) employment of Employee by or association of Employee with an organization that competes with the Company or any of its Affiliates.

SECTION 6

MISCELLANEOUS

(a)Rights in Shares Prior to Issuance. Prior to issuance of Shares in accordance with Section 2(b), neither Employee nor his or her legatees, personal representatives or distributees (i) shall be deemed to be a holder of any Shares represented by the Performance Shares awarded hereunder or (ii) have any voting rights with respect to any such Shares.

(b)Non-assignability. The Performance Shares shall not be transferable by Employee otherwise than by will or by the laws of descent and distribution; provided that, Employee may transfer the Performance Shares during his or her lifetime to a revocable living trust of which Employee is grantor, or to another form of trust indenture of which Employee is a grantor or a beneficiary.

(c)Recoupment. The awards granted pursuant to this Agreement are subject to the terms and conditions contained in the Company’s Executive Compensation Recoupment Policy (the “Recoupment Policy”), which permits the Company to recoup all or a portion of awards made to certain employees upon the occurrence of any Recoupment Event (as defined in the Recoupment Policy).

(d) Securities Law Requirements. The Company shall not be required to issue Shares pursuant to this Agreement unless and until (i) such Shares have been duly listed upon each stock exchange on which the Company’s Common Stock is then registered and (ii) a registration statement under the Securities Act of 1933 with respect to such Shares is then effective.

(e)Designation of Beneficiaries. Employee may file with the Company a written designation of a beneficiary or beneficiaries to receive, in the event of Employee’s death, the Shares determined in accordance with Section 4(b) and subject to all of the provisions of this Agreement. An Employee may from time to time revoke or change any such designation of beneficiary and any designation of beneficiary under the Plan shall be controlling over any other disposition, testamentary or otherwise; provided, however, that if the Committee shall be in doubt as to the right of any such beneficiary to receive Shares, the Committee may recognize only receipt of such Shares by the personal representative of the estate of Employee, in which case the Company, the Committee and the members thereof shall not be under any further liability to anyone.

(f)Changes in Capital Structure. If there is any change in the Common Stock by reason of any extraordinary dividend, stock dividend, spin‑off, split‑up, spin‑out, recapitalization, warrant or rights issuance or combination, exchange or reclassification of shares, merger, consolidation, reorganization, sale of substantially all assets or, in the Committee’s sole discretion, other similar or relevant event, then the number, kind and class of shares available for Performance Shares and the number, kind and class of shares subject to outstanding Performance Shares, as applicable, shall be appropriately adjusted by the Committee. The issuance of shares of Common Stock for consideration and the issuance of common stock rights shall not be considered a change in the Company’s capital structure. No adjustment provided for in this Section shall require the issuance of any fractional shares.

(g)Right to Continued Employment. Nothing in this Agreement shall confer on Employee any right to continued employment or interfere with the right of an employer to terminate Employee’s employment at any time.

(h)Tax Withholding. Employee must pay, or make arrangements acceptable to the Company for the payment of any and all federal, state and local tax withholding that in the opinion of the Company is required by law. Unless Employee satisfies any such tax withholding obligation by paying the amount in cash or by check, the Company will withhold Shares having a Fair Market Value on the date of withholding equal to the tax withholding obligation.

(i)Copy of Plan. By signing this Agreement, Employee acknowledges receipt of a copy of the Plan and any offering circular related to the Plan.

(j)Choice of Law; Venue. This Agreement will be governed by the laws of the State of Missouri, without giving regard to the conflict of law provisions thereof. Any legal action arising out of this Agreement may only be brought in the Circuit Court in St. Louis County and/or the United States District Court in St. Louis, Missouri.

(k)Execution. An authorized representative of the Company has signed this Agreement, and Employee has signed this Agreement to evidence Employee’s acceptance of the award on the terms specified in this Agreement and the Plan, all as of the Date of Grant.

(l)Section 409A. This Agreement is intended to comply with Section 409A of the Code or an exemption thereunder and shall be construed and interpreted in a manner that is consistent with the requirements for avoiding additional taxes or penalties under Section 409A of the Code. Notwithstanding the foregoing, the Company makes no representations that the payments and benefits provided under this Agreement comply with Section 409A of the Code and in no event shall the Company be liable for all or any portion of any taxes, penalties, interest or other expenses that may be incurred by Employee on account of non-compliance with Section 409A of the Code. Notwithstanding anything herein to the contrary, in the event that Employee is determined to be a specified employee within the meaning of Section 409A of the Code, any payment on account of termination of employment shall be made on the first payroll date which is more than six months following the date of Employee’s termination of employment to the extent required to avoid any adverse tax consequences under Section 409A of the Code. To the extent necessary for compliance with Code Section 409A, references to termination of employment under this Agreement shall mean a “separation from service” within the meaning of Section 409A of the Code.

SECTION 7

TERMS OF THE PLAN

This award is granted under and is expressly subject to all the terms and provisions of the Plan, which terms are incorporated herein by reference. Capitalized terms used and not otherwise defined in this Agreement shall have the same meanings ascribed to them in the Plan.

Signature page follows.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of this ___ day of ________, ____.

Reinsurance Group of America, Incorporated

By: ____________________________

Anna Manning

President & Chief Executive Officer

Employee

_______________________________

Name:

EX-10.2

Exhibit 10.2

REINSURANCE GROUP OF AMERICA, INCORPORATED

FLEXIBLE STOCK PLAN

STOCK APPRECIATION RIGHT AWARD AGREEMENT

Reinsurance Group of America, Incorporated, a Missouri corporation (the “Company”), and ____________ (“Employee”) hereby agree as follows:

SECTION 1

GRANT OF STOCK APPRECIATION RIGHT

Pursuant to the Reinsurance Group of America, Incorporated Flexible Stock Plan, as amended and restated effective May 23, 2017 (the “Plan”), and pursuant to action of the Committee charged with the Plan’s administration, the Company has granted to Employee, effective ____________ (the “Date of Grant”), subject to the terms, conditions and limitations stated in this Stock Appreciation Right Award Agreement (this “Agreement”), the Plan and the Company’s Executive Compensation Recoupment Policy (as discussed in Section 8(c)), a stock appreciation right (“SAR”), which is granted with respect to ________ shares (each, a “SAR Share”) of Common Stock.

SECTION 2

EXERCISE PRICE PER SAR SHARE

The “Exercise Price Per SAR Share” shall be $_____, which is the Fair Market Value of one Share of Common Stock as of the Date of Grant.

SECTION 3

EXERCISE OF SAR

(a)Right to Exercise. This SAR is exercisable at any time prior to the Expiration Date, but only to the extent vested on the date of such exercise.

(b)Terms of Exercise. Upon proper exercise of any vested portion of the SAR, Employee or the individual or entity authorized to exercise such SAR as provided herein shall be entitled to receive the excess of (i) the Fair Market Value of the specified number of SAR Shares as of the date of exercise (which shall be determined by multiplying the number of SAR Shares being exercised by the Fair Market Value of one Share on the date of exercise) over (ii) an amount equal to the Exercise Price Per Share multiplied by the number of SAR Shares being exercised. Such excess, if any, shall be paid either (x) in whole Shares, the number of which shall be determined using the Fair Market Value of one Share as of the date of exercise, disregarding any fractional shares, or (y) in cash, with such method of payment to be determined by the Committee in its sole discretion from time to time.

(c)Method of Exercise. The SAR may be exercised in whole or in part by Employee or any other individual authorized pursuant to the terms of this Agreement to exercise the SAR at any time or from time to time in accordance with procedures established by the Committee. As promptly as practicable after such exercise of the SAR, the Company shall issue the number of Shares or pay the amount of cash, as applicable, determined pursuant to Section 3(b) above to Employee or the individual or entity authorized to exercise such SAR as provided herein.

SECTION 4

CONDITIONS AND LIMITATIONS ON RIGHT TO EXERCISE SAR

(a)Vesting. Subject to paragraph (b) of this Section and subject to Sections 6 and 7, this SAR shall vest in four (4) equal annual installments of 25% commencing December 31 of the year of grant.  The SAR must be exercised, if at all, no later than ten (10) years from the Date of Grant (the “Expiration Date”).  The SAR may be exercised in full or in part pursuant to this vesting schedule at any time prior to the Expiration Date.  Upon a partial exercise of this SAR, the number of SAR Shares available for future exercise shall be reduced by the portion of the SAR so exercised.

Date	Cumulative Percentage of SAR Shares That Are Vested
December 31, ____	25%
December 31, ____	50%
December 31, ____	75%
December 31, ____	100%

(b)    Exercise if No Longer an Employee.

(1)Termination. Except as provided in paragraphs (2) or (3) below, the SAR may be exercised only by Employee while serving as an officer or employee of the Company or any of its Affiliates or within 30 days following termination of employment.

Notwithstanding the foregoing, Employee may exercise the SAR following termination only to the extent the SAR was vested and had not been exercised prior to termination, and in no event may the SAR be exercised after the Expiration Date.

An approved leave of absence shall not constitute a termination for purposes of this Section so long as Employee’s right to re-employment is guaranteed either by statute, local law, contract or pursuant to any Company policy. Where re-employment is not so guaranteed, termination shall be deemed to occur on the first day after the end of such approved period of leave.

(2)Disability or Death. Notwithstanding the vesting schedule set forth in Section 4(a) above, in the event Employee ceases to be employed by the Company or any of its Affiliates prior to the Expiration Date due to Disability or death, the SAR shall become immediately 100% vested with respect to the portion of the SAR not exercised prior to the date of Disability or death, and the SAR may be exercised at any time within five (5) years following the earlier to occur of death or Disability, but in no event later than the Expiration Date. Should this Section 4(b)(2) become operative because of Employee’s death, or should Employee die after Employee’s Disability, then the SAR may be exercised by: (i) a legatee or legatees of Employee under Employee’s last will; (ii) Employee’s personal representative(s) under Employee’s last will or, if Employee died without a will, the executor of Employee’s probate estate; or (iii) the trustee(s) of Employee’s revocable living trust or of a trust indenture of which Employee is a grantor or a beneficiary.

For purposes of this Agreement, “Disability” means disability as defined in any long-term disability plan maintained by the Company or an Affiliate which covers Employee or, in the absence of any such plan, the physical or mental condition of Employee arising prior to the Expiration Date, which in the opinion of a qualified physician chosen by the Company prevents Employee from continuing employment with the Company and its Affiliates.

(3)Retirement. In the event of Employee’s Retirement prior to the Expiration Date, the SAR shall continue to vest following such Retirement as provided in Section 4(a) above and shall remain exercisable as if Employee had continued his or her employment with the Company or its Affiliates following such Retirement. In no event may any portion of this SAR be exercised after the Expiration Date. Notwithstanding the vesting schedule set forth in Section 4(a) above, in the event of Employee’s death following Retirement but prior to the Expiration Date, the SAR shall become immediately 100% vested with respect to the portion of the SAR not exercised prior to Employee’s death. The SAR may be exercised at any time within five (5) years following Employee’s death (but in no event later than the Expiration Date) by: (i) a legatee or legatees of Employee under Employee’s last will; (ii) Employee’s personal representative(s) under Employee’s last will or, if Employee died without a will, the executor of Employee’s probate estate; or (iii) the trustee(s) of Employee’s revocable living trust or of a trust indenture of which Employee is a grantor or a beneficiary.

For purposes of this Agreement, “Retirement” means termination of employment with the Company and its Affiliates after Employee has attained a combination of age and years of service that equals at least sixty-five (65); provided that, the maximum number of years of service credited for purposes of this calculation shall be ten (10).

(c)Dividend Equivalents. SARs shall not include dividend equivalent payments or dividend credit rights.

SECTION 5

DELIVERY OF SHARES

The Company shall not be required to issue or deliver any SAR Shares, if applicable, upon the exercise of this SAR prior to (a) the admission of such shares to listing on any stock exchange on which the Company’s Common Stock may then be listed, (b) the completion of any registration and/or qualification of such shares under any state or federal laws (including without limitation the Securities Act of 1933, as amended) or rulings or regulations of any governmental regulatory body, which the Company shall determine to be necessary or advisable, or (c) if the Company so requests, the filing with the Company by Employee or the purchaser acting pursuant to Section 4(b) of a representation in writing at the time of such exercise that it is his or her present intention to acquire the shares being purchased for investment and not for resale or distribution.

SECTION 6

CHANGE OF CONTROL

Notwithstanding the vesting schedule set forth in Section 4(a), in the event of a Change of Control prior to Employee’s termination, Retirement, Disability or death (as described in Section 4(b)), the SAR shall become immediately 100% vested with respect to the portion of the SAR not exercised prior to the Change of Control (but in no event may Employee exercise any portion of the SAR after the Expiration Date).

SECTION 7

CANCELLATION

Notwithstanding anything herein to the contrary, this Agreement shall be cancelled and the SAR granted hereby shall be forfeited, without any further action by the Committee, as a result of Employee’s Malfeasance. In the event of such cancellation, all rights of Employee hereunder shall terminate, irrespective of whether the SAR is otherwise vested, and the shares reserved for use hereunder shall be available for future grant in accordance with the Plan. “Malfeasance” means (1) any conduct, act or omission that is contrary to Employee’s duties as an officer or employee of the Company or any of its Affiliates, or that is inimical or in any way contrary to the best interests of the Company or any of its Affiliates, or (2) employment of Employee by or association of Employee with an organization that competes with the Company or any of its Affiliates.

SECTION 8

MISCELLANEOUS

(a)Rights in Shares Prior to Issuance. Prior to issuance of Shares in accordance with Section 3, neither Employee nor his or her legatees, personal representatives or distributees (i) shall be deemed to be a holder of any Shares subject to this SAR or (ii) have any voting rights with respect to any such Shares.

(b)Non-assignability. This SAR shall not be transferable by Employee otherwise than by will or by the laws of descent and distribution; provided that, Employee may transfer the SAR during his or her lifetime to a revocable living trust of which Employee is grantor, or to another form of trust indenture of which Employee is a grantor or a beneficiary. This SAR may be exercised during Employee’s lifetime only by: Employee; Employee’s guardian, power of attorney, or legal representative; or the trustee of Employee’s revocable living trust or of a trust indenture of which Employee is a grantor or a beneficiary.

(c)Recoupment. The awards granted pursuant to this Agreement are subject to the terms and conditions contained in the Company’s Executive Compensation Recoupment Policy (the “Recoupment Policy”), which permits the Company to recoup all or a portion of awards made to certain employees upon the occurrence of any Recoupment Event (as defined in the Recoupment Policy).

(d)Designation of Beneficiaries. Employee may file with the Company a written designation of a beneficiary or beneficiaries to exercise, in the event of Employee’s death, the SAR granted hereunder, subject to all of the provisions of this Agreement. An Employee may from time to time revoke or change any such designation of beneficiary and any designation of beneficiary under the Plan shall be controlling over any other disposition, testamentary or otherwise; provided, however, that if the Committee shall be in doubt as to the right of any such beneficiary to exercise the SAR, the Committee may recognize only an exercise by the personal representative of the estate of Employee, in which case the Company, the Committee and the members thereof shall not be under any further liability to anyone.

(e)Changes in Capital Structure. If there is any change in the Common Stock by reason of any extraordinary dividend, stock dividend, spin‑off, split‑up, spin‑out, recapitalization, warrant or rights issuance or combination, exchange or reclassification of shares, merger, consolidation, reorganization, sale of substantially all assets or, in the Committee’s sole discretion, other similar or relevant event, then the number, kind and class of shares available for SARs and the number, kind and class of shares subject to outstanding SARs and the exercise price thereof, as applicable, shall be appropriately adjusted by the Committee. The issuance of Shares for consideration and the issuance of Share rights shall not be considered a change in the Company’s capital structure. No adjustment provided for in this Section shall require the issuance of any fractional shares.

(f)Right to Continued Employment. Nothing in this Agreement shall confer on Employee any right to continued employment or interfere with the right of an employer to terminate Employee’s employment at any time.

(g)Tax Withholding. Employee must pay, or make arrangements acceptable to the Company for the payment of any and all federal, state and local tax withholding that in the opinion of the Company is required by law. Unless Employee satisfies any such tax withholding obligation by paying the amount in cash or by check, the Company will withhold Shares having a Fair Market Value on the date of withholding equal to the tax withholding obligation.

(h)Copy of Plan. By signing this Agreement, Employee acknowledges receipt of a copy of the Plan and any offering circular related to the Plan.

(i)Choice of Law; Venue. This Agreement will be governed by the laws of the State of Missouri, without giving regard to the conflict of law provisions thereof. Any legal action arising out of this Agreement may only be brought in the Circuit Court in St. Louis County and/or the United States District Court in St. Louis, Missouri.

(j)Execution. An authorized representative of the Company has signed this Agreement, and Employee has signed this Agreement to evidence Employee’s acceptance of the award on the terms specified in this Agreement and the Plan, all as of the Date of Grant.

SECTION 9

TERMS OF THE PLAN

This award is granted under and is expressly subject to all the terms and provisions of the Plan, which terms are incorporated herein by reference. Capitalized terms used and not otherwise defined in this Agreement shall have the same meanings ascribed to them in the Plan.

Signature page follows.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of this ___ day of ________, _____.

“Company”

Reinsurance Group of America, Incorporated

By:_____________________________________

Name:Anna Manning

Title: President & Chief Executive Officer

“Employee”

_________________________________________________                            

Name:

EX-31.1

Exhibit 31.1

CEO CERTIFICATION

I, Anna Manning, certify that:

1.      I have reviewed this quarterly report on Form 10-Q of Reinsurance Group of America, Incorporated;

2.      Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.      Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.  The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)      Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)      Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)      Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)      Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.      The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)      All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)      Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 4, 2018	/s/ Anna Manning
	Anna Manning
	President & Chief Executive Officer

EX-31.2

Exhibit 31.2

CFO CERTIFICATION

I, Todd C. Larson, certify that:

1.      I have reviewed this quarterly report on Form 10-Q of Reinsurance Group of America, Incorporated;

2.      Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.      Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.  The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)      Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)      Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)      Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)      Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.      The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)      All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)      Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 4, 2018	/s/ Todd C. Larson
	Todd C. Larson
	Senior Executive Vice President & Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Reinsurance Group of America, Incorporated and subsidiaries, (the “Company”), for the quarterly period ended March 31, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Anna Manning, Chief Executive Officer of the Company, certifies, to her best knowledge and belief, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.  The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.   The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 4, 2018	/s/ Anna Manning
	Anna Manning
	President & Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Reinsurance Group of America, Incorporated and subsidiaries, (the “Company”), for the quarterly period ended March 31, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Todd C. Larson, Chief Financial Officer of the Company, certifies, to his best knowledge and belief, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.  The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.   The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 4, 2018	/s/ Todd C. Larson
	Todd C. Larson
	Chief Financial Officer
	& Senior Executive Vice President

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document And Entitiy Information [Abstract]
Document Type	10-Q
Document period end date	Mar. 31, 2018
Amendment flag	false
Entity registrant name	REINSURANCE GROUP OF AMERICA INC
Entity central index key	0000898174
Entity current reporting status	Yes
Entity voluntary filers	No
Current fiscal year end date	--12-31
Entity filer category	Large Accelerated Filer
Entity well-known seasoned issuer	Yes
Common Shares Outstanding		64,523,063
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1

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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Fixed maturity securities available-for-sale, at fair value (amortized cost $35,913,705 and $35,281,412)	$ 37,945,260	$ 38,150,820
Available-for-sale Securities, Equity Securities	103,983	100,152
Mortgage loans on real estate (net of allowances of $8,864 and $9,384)	4,437,994	4,400,533
Policy loans	1,346,930	1,357,624
Funds withheld at interest	6,005,892	6,083,388
Short-term investments	130,430	93,304
Other invested assets	1,512,147	1,505,332
Total investments	51,482,636	51,691,153
Cash and cash equivalents	1,510,407	1,303,524
Accrued investment income	408,338	392,721
Premiums receivable and other reinsurance balances	2,620,515	2,338,481
Reinsurance ceded receivables	810,554	782,027
Deferred policy acquisition costs	3,245,851	3,239,824
Other assets	876,522	767,088
Total assets	60,954,823	60,514,818
Liabilities and Stockholders’ Equity
Future policy benefits	22,645,243	22,363,241
Interest-sensitive contract liabilities	16,661,602	16,227,642
Other policy claims and benefits	5,361,149	4,992,074
Other reinsurance balances	483,708	488,739
Deferred income taxes	2,085,631	2,198,309
Other liabilities	1,167,596	1,102,975
Long-term debt	2,788,240	2,788,365
Collateral finance and securitization notes	753,393	783,938
Total liabilities	51,946,562	50,945,283
Commitments and contingent liabilities (See Note 8)
Stockholders’ Equity:
Preferred stock - par value $.01 per share, 10,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock - par value $.01 per share, 140,000,000 shares authorized, 79,137,758 shares issued at March 31, 2018 and December 31, 2017	791	791
Additional paid-in-capital	1,880,352	1,870,906
Retained earnings	6,797,545	6,736,265
Treasury stock, at cost - 14,624,985 and 14,685,663 shares	(1,098,823)	(1,102,058)
Accumulated other comprehensive income	1,428,396	2,063,631
Total stockholders’ equity	9,008,261	9,569,535
Total liabilities and stockholders’ equity	$ 60,954,823	$ 60,514,818

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CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available for Sale at Fair value - Amortized cost	$ 35,913,705	$ 35,281,412
Preferred stock par value (per share)	$ 0.01	$ 0.01
Preferred stock shares authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common stock par value (per share)	$ 0.01	$ 0.01
Common stock shares authorized	140,000,000	140,000,000
Common Stock, Shares, Issued	79,137,758	79,137,758
Common stock shares outstanding	64,512,773	64,452,095
Treasury stock, shares	14,624,985	14,685,663
Allowance for Loan and Lease Losses, Real Estate	$ 8,864	$ 9,384
Available-for-sale Equity Securities, Amortized Cost Basis	$ 110,747	$ 102,841

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Net premiums	$ 2,582,551	$ 2,365,696
Investment income, net of related expenses	516,329	514,364
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	0	(17,189)
Other investment related gains (losses), net	(470)	77,712
Total investment related gains (losses), net	(470)	60,523
Other revenues	75,297	68,157
Total revenues	3,173,707	3,008,740
Benefits and Expenses:
Claims and other policy benefits	2,362,101	2,106,145
Interest credited	80,449	107,684
Policy acquisition costs and other insurance expenses	356,902	379,389
Other operating expenses	191,274	158,506
Interest expense	37,454	42,402
Collateral finance and securitization expense	7,602	6,770
Total benefits and expenses	3,035,782	2,800,896
Income before income taxes	137,925	207,844
Provision for income taxes	37,695	62,332
Net income	$ 100,230	$ 145,512
Earnings per share:
Basic earnings per share	$ 1.55	$ 2.26
Diluted earnings per share	1.52	2.22
Dividends declared per share	$ 0.50	$ 0.41

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Comprehensive income (loss)
Net income	$ 100,230	$ 145,512
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(1,160)	(22,213)
Net unrealized investment gains (losses)	(633,604)	203,115
Defined benefit pension and postretirement plan adjustments	(471)	924
Total other comprehensive income (loss), net of tax	(635,235)	181,826
Total comprehensive income (loss)	$ (535,005)	$ 327,338

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net income	$ 100,230	$ 145,512
Change in operating assets and liabilities:
Accrued investment income	(10,484)	(10,501)
Premiums receivable and other reinsurance balances	(275,354)	(54,845)
Deferred policy acquisition costs	13,007	58,962
Reinsurance ceded receivable balances	(21,872)	(81,046)
Future policy benefits, other policy claims and benefits, and other reinsurance balances	466,983	396,459
Deferred income taxes	33,715	50,110
Other assets and other liabilities, net	(41,385)	(11,101)
Amortization of net investment premiums, discounts and other	(31,032)	(23,471)
Depreciation, Depletion and Amortization	10,294	6,845
Investment related (gains) losses, net	470	(60,523)
Other, net	(20,823)	964
Net cash provided by operating activities	223,749	417,365
Cash Flows from Investing Activities:
Sales of fixed maturity securities available-for-sale	1,898,722	1,563,956
Maturities of fixed maturity securities available-for-sale	195,549	201,515
Proceeds from Sale of Available-for-sale Securities, Equity	29,683	152,509
Payments to Acquire Mortgage Notes Receivable	(102,002)	(88,835)
Payments to Fund Policy Loans	(10,694)	(24,663)
Payments to Acquire Available-for-sale Securities	1,969,899	1,933,120
Payments to Acquire Available-for-sale Securities, Equity	(2,173)	(14,646)
Proceeds from Sale and Collection of Mortgage Notes Receivable	(141,131)	(184,575)
Increase (Decrease) in Funds Held under Reinsurance Agreements	(19,638)	2,753
Payments to Acquire Businesses, Net of Cash Acquired	24,864	0
Payments to Acquire Property, Plant, and Equipment	(5,292)	(16,893)
Change in short-term investments	(13,026)	23,668
Change in other invested assets	(23,353)	(14,126)
Net cash provided by (used in) investing activities	76,550	(110,967)
Cash Flows from Financing Activities:
Dividends to stockholders	(32,241)	(26,381)
Proceeds from (Repayments of) Secured Debt	(27,104)	(16,908)
Repayments of Long-term Debt	(662)	(300,636)
Purchases of treasury stock	(2,616)	(3,067)
Exercise of stock options, net	1,163	1,719
Change in cash collateral for derivative positions and other arrangements	19,537	(3,628)
Deposits on universal life and other investment type policies and contracts	83,004	202,850
Withdrawals on universal life and other investment type policies and contracts	(156,486)	(201,784)
Net cash used in financing activities	(115,405)	(347,835)
Effect of exchange rate changes on cash	21,989	18,833
Change in cash and cash equivalents	206,883	(22,604)
Cash and cash equivalents, beginning of period	1,303,524	1,200,718
Cash and cash equivalents, end of period	1,510,407	1,178,114
Supplemental disclosures of cash flow information:
Noncash or Part Noncash Acquisition, Value of Assets Acquired	59,184	0
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	34,320	0
Interest Paid, Net	39,284	46,401
Income Taxes Paid, Net	6,356	12,132
Payments to Acquire Businesses, Gross	(24,864)
Transfer to Investments	$ 605,085	$ 1,653

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS PARENTHETICAL $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Statement of Cash Flows [Abstract]
Cash Acquired from Acquisition	$ 1,733

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Business and Basis of Presentation

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Basis of Presentation

Business and Basis of Presentation

Reinsurance Group of America, Incorporated (“RGA”) is an insurance holding company that was formed on December 31, 1992. The accompanying unaudited condensed consolidated financial statements of RGA and its subsidiaries (collectively, the “Company”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these condensed consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, including normal recurring adjustments necessary for a fair presentation have been included. Results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. These unaudited condensed consolidated financial statements include the accounts of RGA and its subsidiaries, and all intercompany accounts and transactions have been eliminated. These condensed consolidated statements should be read in conjunction with the Company’s 2017 Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on February 27, 2018 (the “2017 Annual Report”).

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Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):

	Three months ended March 31,
	2018		2017
Earnings:
Net income (numerator for basic and diluted calculations)	$	100,230	$	145,512
Shares:
Weighted average outstanding shares (denominator for basic calculation)	64,490		64,353
Equivalent shares from outstanding stock options	1,382		1,318
Denominator for diluted calculation	65,872		65,671
Earnings per share:
Basic	$	1.55	$	2.26
Diluted	$	1.52	$	2.22

The calculation of common equivalent shares does not include the impact of options having a strike or conversion price that exceeds the average stock price for the earnings period, as the result would be antidilutive. The calculation of common equivalent shares also excludes the impact of outstanding performance contingent shares, as the conditions necessary for their issuance have not been satisfied as of the end of the reporting period. For the three months ended March 31, 2018, approximately 0.2 million stock options and approximately 0.2 million performance contingent shares were excluded from the calculation. For the three months ended March 31, 2017, approximately 0.2 million stock options and approximately 0.5 million performance contingent shares were excluded from the calculation.

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Equity

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

Equity

Common stock

The changes in number of common stock shares, issued, held in treasury and outstanding are as follows for the periods indicated:

	Issued	Held In Treasury		Outstanding
Balance, December 31, 2017	79,137,758	14,685,663		64,452,095
Stock-based compensation (1)	—	(60,678	)	60,678
Balance, March 31, 2018	79,137,758	14,624,985		64,512,773

	Issued	Held In Treasury		Outstanding
Balance, December 31, 2016	79,137,758	14,835,256		64,302,502
Stock-based compensation (1)	—	(86,049	)	86,049
Balance, March 31, 2017	79,137,758	14,749,207		64,388,551

(1) Represents net shares issued from treasury pursuant to the Company’s equity-based compensation programs.

Common Stock Held in Treasury

Common stock held in treasury is accounted for at average cost. Gains resulting from the reissuance of common stock held in treasury are credited to additional paid-in capital. Losses resulting from the reissuance of common stock held in treasury are charged first to additional paid-in capital to the extent the Company has previously recorded gains on treasury share transactions, then to retained earnings.

On January 26, 2017, RGA’s board of directors authorized a share repurchase program for up to $400.0 million of RGA’s outstanding common stock. The authorization was effective immediately and does not have an expiration date. During the three months ended March 31, 2018 and 2017, no common stock was repurchased by RGA under this program.

Accumulated Other Comprehensive Income (Loss)

The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the three months ended March 31, 2018 and 2017 are as follows (dollars in thousands):

	Accumulated Other Comprehensive Income (Loss), Net of Income Tax
	Accumulated Currency Translation Adjustments			Unrealized Appreciation (Depreciation) of Investments(1)			Pension and Postretirement Benefits			Total
Balance, December 31, 2017	$	(86,350	)	$	2,200,661		$	(50,680	)	$	2,063,631
Other comprehensive income (loss) before reclassifications	5,696			(827,701		)	(1,910		)	(823,915		)
Amounts reclassified to AOCI	—			21,274			1,346			22,620
Deferred income tax benefit (expense)	(6,856		)	172,823			93			166,060
Balance, March 31, 2018	$	(87,510	)	$	1,567,057		$	(51,151	)	$	1,428,396

	Accumulated Other Comprehensive Income (Loss), Net of Income Tax
	Accumulated Currency Translation Adjustments			Unrealized Appreciation (Depreciation) of Investments(1)			Pension and Postretirement Benefits			Total
Balance, December 31, 2016	$	(172,541	)	$	1,355,033		$	(43,163	)	$	1,139,329
Other comprehensive income (loss) before reclassifications	(50,735		)	283,443			(27		)	232,681
Amounts reclassified to AOCI	—			5,762			1,456			7,218
Deferred income tax benefit (expense)	28,522			(86,090		)	(505		)	(58,073		)
Balance, March 31, 2017	$	(194,754	)	$	1,558,148		$	(42,239	)	$	1,321,155

(1) Includes cash flow hedges of $20,662 and $2,619 as of March 31, 2018 and December 31, 2017, respectively, and $7,690 and $(2,496) as of March 31, 2017 and December 31, 2016, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

The following table presents the amounts of AOCI reclassifications for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Amount Reclassified from AOCI
	Three months ended March 31,
Details about AOCI Components	2018			2017			Affected Line Item in  Statement of Income
Net unrealized investment gains (losses):
Net unrealized gains (losses) on available-for-sale securities	$	(14,456	)	$	(11,857	)	Investment related gains (losses), net
Cash flow hedges - Interest rate	(370		)	—			(1)
Cash flow hedges - Currency/Interest rate	144			197			(1)
Cash flow hedges - Forward bond purchase commitments	—			50			(1)
Deferred policy acquisition costs attributed to unrealized gains and losses	(6,592		)	5,848			(2)
Total	(21,274		)	(5,762		)
Provision for income taxes	4,678			3,194
Net unrealized gains (losses), net of tax	$	(16,596	)	$	(2,568	)
Amortization of defined benefit plan items:
Prior service cost (credit)	$	246		$	82		(3)
Actuarial gains/(losses)	(1,592		)	(1,538		)	(3)
Total	(1,346		)	(1,456		)
Provision for income taxes	283			510
Amortization of defined benefit plans, net of tax	$	(1,063	)	$	(946	)
Total reclassifications for the period	$	(17,659	)	$	(3,514	)

(1) See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

(2) This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2017 Annual Report for additional details.

(3) This AOCI component is included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional deta

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Equity Based Compensation

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Equity Based Compensation

ity compensation expense was $9.7 million and $9.6 million for the three months ended March 31, 2018 and 2017, respectively. In the first quarter of 2018, the Company granted 0.2 million stock appreciation rights at $150.87 weighted average exercise price per share and 0.1 million performance contingent units to employees. Additionally, non-employee directors were granted a total of 7,263 shares of common stock. As of March 31, 2018, 1.7 million share options at a weighted average strike price per share of $68.51 were vested and exercisable, with a remaining weighted average exercise period of 4.9 years.

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Investments

3 Months Ended

Mar. 31, 2018

Investments [Abstract]

Investments

Investments

Fixed Maturity and Equity Securities Available-for-Sale

The Company holds various types of fixed maturity securities available-for-sale and classifies them as corporate securities (“Corporate”), Canadian and Canadian provincial government securities (“Canadian government”), residential mortgage-backed securities (“RMBS”), asset-backed securities (“ABS”), commercial mortgage-backed securities (“CMBS”), U.S. government and agencies (“U.S. government”), state and political subdivisions, and other foreign government, supranational and foreign government-sponsored enterprises (“Other foreign government”).

The following table provides information relating to investments in fixed maturity securities by sector as of March 31, 2018 (dollars in thousands):

March 31, 2018:	Amortized		Unrealized		Unrealized		Estimated Fair		% of		Other-than- temporary impairments
	Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
Corporate	$	22,890,985	$	869,867	$	240,383	$	23,520,469	61.9	%	$	—
Canadian government	2,803,077		1,297,817		3,040		4,097,854		10.8		—
RMBS	1,791,007		23,640		27,499		1,787,148		4.7		—
ABS	1,727,810		16,383		9,471		1,734,722		4.6		275
CMBS	1,281,452		12,717		12,236		1,281,933		3.4		—
U.S. government	1,486,262		9,266		59,414		1,436,114		3.8		—
State and political subdivisions	672,064		49,465		8,016		713,513		1.9		—
Other foreign government	3,261,048		133,865		21,406		3,373,507		8.9		—
Total fixed maturity securities	$	35,913,705	$	2,413,020	$	381,465	$	37,945,260	100.0	%	$	275

The following table provides information relating to investments in fixed maturity and equity securities by sector as of December 31, 2017 (dollars in thousands):

December 31, 2017:	Amortized		Unrealized		Unrealized		Estimated Fair		% of		Other-than- temporary impairments
	Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
Corporate	$	21,966,803	$	1,299,594	$	55,429	$	23,210,968	60.9	%	$	—
Canadian government	2,843,273		1,378,510		1,707		4,220,076		11.1		—
RMBS	1,695,126		36,632		11,878		1,719,880		4.5		—
ABS	1,634,758		18,798		5,194		1,648,362		4.3		275
CMBS	1,285,594		22,627		4,834		1,303,387		3.4		—
U.S. government	1,953,436		12,089		21,933		1,943,592		5.1		—
State and political subdivisions	647,727		59,997		4,296		703,428		1.8		—
Other foreign government	3,254,695		154,507		8,075		3,401,127		8.9		—
Total fixed maturity securities	$	35,281,412	$	2,982,754	$	113,346	$	38,150,820	100.0	%	$	275
Non-redeemable preferred stock	$	41,553	$	479	$	2,226	$	39,806	39.7	%
Other equity securities	61,288		479		1,421		60,346		60.3
Total equity securities	$	102,841	$	958	$	3,647	$	100,152	100.0	%

The Company enters into various collateral arrangements with counterparties that require both the pledging and acceptance of fixed maturity securities as collateral. Pledged fixed maturity securities are included in fixed maturity securities, available-for-sale in the condensed consolidated balance sheets. Fixed maturity securities received as collateral are held in separate custodial accounts and are not recorded on the Company’s condensed consolidated balance sheets. Subject to certain constraints, the Company is permitted by contract to sell or repledge collateral it receives; however, as of March 31, 2018 and December 31, 2017, none of the collateral received had been sold or repledged. The Company also holds assets in trust to satisfy collateral requirements under derivative transactions and certain third-party reinsurance treaties. The following table includes fixed maturity securities pledged and received as collateral and assets in trust held to satisfy collateral requirements under derivative transactions and certain third-party reinsurance treaties as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Fixed maturity securities pledged as collateral	$	72,850	$	75,384	$	72,542	$	75,622
Fixed maturity securities received as collateral	n/a		614,423		n/a		590,417
Assets in trust held to satisfy collateral requirements	16,316,662		17,076,547		15,584,296		16,715,281

The Company monitors its concentrations of financial instruments on an ongoing basis and mitigates credit risk by maintaining a diversified investment portfolio which limits exposure to any one issuer. The Company’s exposure to concentrations of credit risk from single issuers greater than 10% of the Company’s stockholders’ equity included securities of the U.S. government and its agencies as well as the securities disclosed below as of March 31, 2018 and December 31, 2017 (dollars in thousands).

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Fixed maturity securities guaranteed or issued by:
Canadian province of Quebec	$	1,106,753	$	1,863,568	$	1,119,337	$	1,917,996
Canadian province of Ontario	928,384		1,247,158		939,837		1,282,944

The amortized cost and estimated fair value of fixed maturity securities classified as available-for-sale at March 31, 2018 are shown by contractual maturity in the table below (dollars in thousands). Actual maturities can differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date.

	Amortized Cost		Estimated Fair Value
Available-for-sale:
Due in one year or less	$	900,166	$	905,385
Due after one year through five years	7,939,821		8,084,053
Due after five years through ten years	9,533,025		9,779,934
Due after ten years	12,740,424		14,372,085
Asset and mortgage-backed securities	4,800,269		4,803,803
Total	$	35,913,705	$	37,945,260

Corporate Fixed Maturity Securities

The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of March 31, 2018 and December 31, 2017 (dollars in thousands):

March 31, 2018:			Estimated
	Amortized Cost		Fair Value		% of Total
Finance	$	8,250,681	$	8,407,037	35.8	%
Industrial	12,093,034		12,437,180		52.8
Utility	2,547,270		2,676,252		11.4
Total	$	22,890,985	$	23,520,469	100.0	%
December 31, 2017:			Estimated
	Amortized Cost		Fair Value		% of Total
Finance	$	7,977,885	$	8,362,774	36.1	%
Industrial	11,535,166		12,199,333		52.5
Utility	2,453,752		2,648,861		11.4
Total	$	21,966,803	$	23,210,968	100.0	%

Other-Than-Temporary Impairments - Fixed Maturity Securities

As discussed in Note 2 – “Summary of Significant Accounting Policies” of the 2017 Annual Report, a portion of certain other-than-temporary impairment (“OTTI”) losses on fixed maturity securities is recognized in AOCI. For these securities, the net amount recognized in the condensed consolidated statements of income (“credit loss impairments”) represents the difference between the amortized cost of the security and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security prior to impairment. Any remaining difference between the fair value and amortized cost is recognized in AOCI. The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts (dollars in thousands):

	Three months ended March 31,
	2018		2017
Balance, beginning of period	$	3,677	$	6,013
Credit loss OTTI previously recognized on securities impaired to fair value during the period	—		(2,336		)
Balance, end of period	$	3,677	$	3,677

Unrealized Losses for Fixed Maturity and Equity Securities Available-for-Sale

The following table presents the total gross unrealized losses for the 2,114 fixed maturity securities as of March 31, 2018, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

	March 31, 2018
	Gross Unrealized Losses		% of Total
Less than 20%	$	358,873	94.1	%
20% or more for less than six months	20,232		5.3
20% or more for six months or greater	2,360		0.6
Total	$	381,465	100.0	%

The following table presents the total gross unrealized losses for the 1,116 fixed maturity and equity securities at December 31, 2017 where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

	December 31, 2017
	Gross Unrealized Losses		% of Total
Less than 20%	$	113,466	97.0	%
20% or more for less than six months	689		0.6
20% or more for six months or greater	2,838		2.4
Total	$	116,993	100.0	%

The Company’s determination of whether a decline in value is other-than-temporary includes analysis of the underlying credit and the extent and duration of a decline in value. The Company’s credit analysis of an investment includes determining whether the issuer is current on its contractual payments, evaluating whether it is probable that the Company will be able to collect all amounts due according to the contractual terms of the security and analyzing the overall ability of the Company to recover the amortized cost of the investment.

The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 2,114 fixed maturity securities that have estimated fair values below amortized cost as of March 31, 2018 (dollars in thousands). These investments are presented by class and grade of security, as well as the length of time the related fair value has remained below amortized cost.

	Less than 12 months				12 months or greater				Total
			Gross				Gross				Gross
March 31, 2018:	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
Corporate	$	7,282,079	$	155,541	$	883,699	$	46,908	$	8,165,778	$	202,449
Canadian government	39,192		390		109,552		2,536		148,744		2,926
RMBS	897,255		19,899		225,288		7,575		1,122,543		27,474
ABS	612,053		7,001		114,605		2,423		726,658		9,424
CMBS	538,464		8,026		103,447		4,210		641,911		12,236
U.S. government	488,095		16,856		744,844		42,558		1,232,939		59,414
State and political subdivisions	135,158		3,331		67,949		4,685		203,107		8,016
Other foreign government	746,485		15,575		191,446		5,000		937,931		20,575
Total investment grade securities	10,738,781		226,619		2,440,830		115,895		13,179,611		342,514
Below investment grade securities:
Corporate	452,086		29,597		46,976		8,337		499,062		37,934
Canadian government	1,900		114		—		—		1,900		114
RMBS	—		—		1,272		25		1,272		25
ABS	—		—		1,173		47		1,173		47
Other foreign government	57,385		662		12,045		169		69,430		831
Total below investment grade securities	511,371		30,373		61,466		8,578		572,837		38,951
Total fixed maturity securities	$	11,250,152	$	256,992	$	2,502,296	$	124,473	$	13,752,448	$	381,465

The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 1,116 fixed maturity and equity securities that have estimated fair values below amortized cost as of December 31, 2017 (dollars in thousands):

	Less than 12 months				12 months or greater				Total
			Gross				Gross				Gross
December 31, 2017:	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
Corporate	$	1,886,212	$	17,099	$	1,009,750	$	28,080	$	2,895,962	$	45,179
Canadian government	18,688		91		111,560		1,596		130,248		1,687
RMBS	566,699		5,852		224,439		6,004		791,138		11,856
ABS	434,274		2,707		168,524		2,434		602,798		5,141
CMBS	220,401		1,914		103,269		2,920		323,670		4,834
U.S. government	800,298		6,177		767,197		15,756		1,567,495		21,933
State and political subdivisions	43,510		242		68,666		4,054		112,176		4,296
Other foreign government	369,717		2,707		191,265		4,704		560,982		7,411
Total investment grade securities	4,339,799		36,789		2,644,670		65,548		6,984,469		102,337
Below investment grade securities:
Corporate	194,879		3,317		75,731		6,933		270,610		10,250
Canadian government	1,995		20		—		—		1,995		20
RMBS	—		—		1,369		22		1,369		22
ABS	—		—		1,489		53		1,489		53
Other foreign government	28,600		113		15,134		551		43,734		664
Total below investment grade securities	225,474		3,450		93,723		7,559		319,197		11,009
Total fixed maturity securities	$	4,565,273	$	40,239	$	2,738,393	$	73,107	$	7,303,666	$	113,346
Non-redeemable preferred stock	$	82	$	1	$	26,471	$	2,225	$	26,553	$	2,226
Other equity securities	5,820		1,023		47,251		398		53,071		1,421
Total equity securities	$	5,902	$	1,024	$	73,722	$	2,623	$	79,624	$	3,647

The Company has no intention to sell, nor does it expect to be required to sell, the securities outlined in the table above, as of the dates indicated. However, unforeseen facts and circumstances may cause the Company to sell fixed maturity securities in the ordinary course of managing its portfolio to meet certain diversification, credit quality and liquidity guidelines.

Unrealized losses on below investment grade securities as of March 31, 2018 are primarily related to high-yield corporate securities. Changes in unrealized losses are primarily being driven by changes in interest rates.

Investment Income, Net of Related Expenses

Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):

	Three months ended March 31,
	2018			2017
Fixed maturity securities available-for-sale	$	369,203		$	324,500
Equity securities	1,682			1,359
Mortgage loans on real estate	50,199			44,347
Policy loans	14,780			15,272
Funds withheld at interest	75,445			127,578
Short-term investments and cash and cash equivalents	3,245			1,510
Other	23,828			18,468
Investment income	538,382			533,034
Investment expense	(22,053		)	(18,670		)
Investment income, net of related expenses	$	516,329		$	514,364

Investment Related Gains (Losses), Net

Investment related gains (losses), net consist of the following (dollars in thousands):

	Three months ended March 31,
	2018			2017
Fixed maturity securities available for sale:
Other-than-temporary impairment losses on fixed maturity securities recognized in earnings	$	—		$	(17,189	)
Gain on investment activity	10,966			17,893
Loss on investment activity	(20,380		)	(8,687		)
Equity securities:
Gain on investment activity	28			—
Loss on investment activity	(950		)	(3,876		)
Change in unrealized gains (losses) recognized in earnings	(4,137		)	—
Other impairment losses and change in mortgage loan provision	(312		)	(99		)
Derivatives and other, net	14,315			72,481
Total investment related gains (losses), net	$	(470	)	$	60,523

There were no fixed maturity impairments for the three months ended March 31, 2018. The fixed maturity impairments for the three months ended March 31, 2017 were largely related to high-yield corporate securities. The other impairment losses and change in mortgage loan provision for the three months ended March 31, 2018 were primarily due to impairments on real estate joint ventures offset by a release of the mortgage loan valuation allowance. The other impairment losses and change in mortgage loan provision for the three months ended March 31, 2017 were primarily due to an increase in the mortgage loan valuation allowance. The fluctuations in investment related gains (losses) for derivatives and other for the three months ended March 31, 2018, compared to the same period in 2017, are primarily due to changes in the fair value of embedded derivatives and interest rate swaps.

During the three months ended March 31, 2018 and 2017, the Company sold fixed maturity securities with fair values of $1,263.6 million and $428.6 million at losses of $20.4 million and $8.7 million, respectively. During the three months ended March 31, 2018 and 2017, the Company sold equity securities with fair values of $28.4 million and $147.6 million at losses of $1.0 million and $3.9 million, respectively. The Company generally does not buy and sell securities on a short-term basis.

Securities Borrowing, Lending and Other

The following table includes the amount of borrowed securities, securities lent and securities collateral received as part of the securities lending program and repurchased/reverse repurchased securities pledged and received as of March 31, 2018 and December 31, 2017 (dollars in thousands).

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Borrowed securities	$	353,875	$	370,760	$	358,875	$	377,820
Securities lending:
Securities loaned	117,449		118,617		117,246		121,551
Securities received	n/a		128,000		n/a		128,000
Repurchase program/reverse repurchase program:
Securities pledged	403,135		411,988		413,819		428,344
Securities received	n/a		404,871		n/a		417,550

The Company also held cash collateral for repurchase program/reverse repurchase programs of $30.7 million and $31.2 million at March 31, 2018 and December 31, 2017, respectively. No cash or securities have been pledged by the Company for its securities borrowing program as of March 31, 2018 and December 31, 2017.

The following table presents information on the Company’s securities lending and repurchase transactions as of March 31, 2018 and December 31, 2017 (dollars in thousands). Collateral associated with certain borrowed securities is not included within the table, as the collateral pledged to each counterparty is the right to reinsurance treaty cash flows.

	March 31, 2018
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater than 90 Days		Total
Securities lending transactions:
Corporate	$	—	$	—	$	—	$	118,617	$	118,617
Total	$	—	$	—	$	—	$	118,617	$	118,617
Repurchase transactions:
Corporate	$	—	$	—	$	—	$	171,678	$	171,678
RMBS	—		—		—		—		—
U.S. government	—		—		—		219,509		219,509
Foreign government	—		—		—		19,670		19,670
Other	1,131		—		—		—		1,131
Total	1,131		—		—		410,857		411,988
Total borrowings	$	1,131	$	—	$	—	$	529,474	$	530,605
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table									$	563,587
Amounts related to agreements not included in offsetting disclosure									$	32,982

	December 31, 2017
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater than 90 Days		Total
Securities lending transactions:
Corporate	$	—	$	—	$	—	$	121,551	$	121,551
Total	$	—	$	—	$	—	$	121,551	$	121,551
Repurchase transactions:
Corporate	$	—	$	—	$	312	$	184,334	$	184,646
RMBS	—		—		—		—		—
U.S. government	—		—		—		220,765		220,765
Foreign government	—		—		—		21,802		21,802
Other	1,131		—		—		—		1,131
Total	1,131		—		312		426,901		428,344
Total borrowings	$	1,131	$	—	$	312	$	548,452	$	549,895
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table									$	576,786
Amounts related to agreements not included in offsetting disclosure									$	26,891

The Company has elected to offset amounts recognized as receivables and payables resulting from the repurchase/reverse repurchase programs. After the effect of offsetting, the net amount presented on the condensed consolidated balance sheets was a liability of $0.4 million and $1.1 million as of March 31, 2018 and December 31, 2017, respectively. As of March 31, 2018 and December 31, 2017, the Company recognized payables resulting from cash received as collateral associated with a repurchase agreement, as discussed above. Amounts owed to and due from the counterparties may be settled in cash or offset, in accordance with the agreements.

Mortgage Loans on Real Estate

Mortgage loans represented approximately 8.6% and 8.5% of the Company’s total investments as of March 31, 2018 and December 31, 2017. As of March 31, 2018, mortgage loans were geographically dispersed throughout the U.S. with the largest concentrations in California (19.6%), Texas (8.6%) and Georgia (7.5%) and include loans secured by properties in Canada (2.4%). The recorded investment in mortgage loans on real estate presented below is gross of unamortized deferred loan origination fees and expenses, and valuation allowances.

The distribution of mortgage loans by property type is as follows as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018					December 31, 2017
Property type:	Carrying Value			% of Total		Carrying Value			% of Total
Office building	$	1,518,170		34.1	%	$	1,487,392		33.6	%
Retail	1,236,933			27.8		1,270,676			28.8
Industrial	964,685			21.7		938,612			21.3
Apartment	497,699			11.2		510,052			11.6
Other commercial	232,804			5.2		206,439			4.7
Recorded investment	4,450,291			100.0	%	$	4,413,171		100.0	%
Unamortized balance of loan origination fees and expenses	(3,433		)			(3,254		)
Valuation allowances	(8,864		)			(9,384		)
Total mortgage loans on real estate	$	4,437,994				$	4,400,533

The maturities of the mortgage loans as of March 31, 2018 and December 31, 2017 are as follows (dollars in thousands):

	March 31, 2018				December 31, 2017
	Recorded Investment		% of Total		Recorded Investment		% of Total
Due within five years	$	1,130,108	25.4	%	$	1,091,066	24.8	%
Due after five years through ten years	2,492,588		56.0		2,516,872		57.0
Due after ten years	827,595		18.6		805,233		18.2
Total	$	4,450,291	100.0	%	$	4,413,171	100.0	%

The following tables set forth certain key credit quality indicators of the Company’s recorded investment in mortgage loans as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	Recorded Investment
	Debt Service Ratios						Construction loans
	>1.20x		1.00x - 1.20x		<1.00x				Total		% of Total
March 31, 2018:
Loan-to-Value Ratio
0% - 59.99%	$	2,154,344	$	79,738	$	6,855	$	12,279	$	2,253,216	50.6	%
60% - 69.99%	1,520,008		29,795		68,070		—		1,617,873		36.4
70% - 79.99%	360,183		27,682		30,904		—		418,769		9.4
Greater than 80%	125,660		30,497		4,276		—		160,433		3.6
Total	$	4,160,195	$	167,712	$	110,105	$	12,279	$	4,450,291	100.0	%

	Recorded Investment
	Debt Service Ratios						Construction loans
	>1.20x		1.00x - 1.20x		<1.00x				Total		% of Total
December 31, 2017:
Loan-to-Value Ratio
0% - 59.99%	$	2,148,428	$	53,979	$	3,801	$	—	$	2,206,208	50.0	%
60% - 69.99%	1,517,029		47,128		43,921		—		1,608,078		36.4
70% - 79.99%	396,446		19,461		15,367		—		431,274		9.8
Greater than 80%	120,850		30,713		6,362		9,686		167,611		3.8
Total	$	4,182,753	$	151,281	$	69,451	$	9,686	$	4,413,171	100.0	%

The age analysis of the Company’s past due recorded investments in mortgage loans as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018		December 31, 2017
31-60 days past due	$	17,102	$	17,100
61-90 days past due	—		2,056
Greater than 90 days	2,056		—
Total past due	19,158		19,156
Current	4,431,133		4,394,015
Total	$	4,450,291	$	4,413,171

The following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018		December 31, 2017
Mortgage loans:
Individually measured for impairment	$	23,423	$	5,858
Collectively measured for impairment	4,426,868		4,407,313
Recorded investment	$	4,450,291	$	4,413,171
Valuation allowances:
Individually measured for impairment	$	—	$	—
Collectively measured for impairment	8,864		9,384
Total valuation allowances	$	8,864	$	9,384

Information regarding the Company’s loan valuation allowances for mortgage loans for the three months ended March 31, 2018 and 2017 is as follows (dollars in thousands):

	Three months ended March 31,
	2018			2017
Balance, beginning of period	$	9,384		$	7,685
Provision (release)	(516		)	101
Translation adjustment	(4		)	—
Balance, end of period	$	8,864		$	7,786

Information regarding the portion of the Company’s mortgage loans that were impaired as of March 31, 2018 and December 31, 2017 is as follows (dollars in thousands):

	Unpaid Principal Balance		Recorded Investment		Related Allowance		Carrying Value
March 31, 2018:
Impaired mortgage loans with no valuation allowance recorded	$	—	$	23,423	$	—	$	23,423
Impaired mortgage loans with valuation allowance recorded	—		—		—		—
Total impaired mortgage loans	$	—	$	23,423	$	—	$	23,423
December 31, 2017:
Impaired mortgage loans with no valuation allowance recorded	$	6,427	$	5,858	$	—	$	5,858
Impaired mortgage loans with valuation allowance recorded	—		—		—		—
Total impaired mortgage loans	$	6,427	$	5,858	$	—	$	5,858
The Company’s average investment balance of impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands):
	Three months ended March 31,
	2018				2017
	Average Recorded Investment(1)		Interest Income		Average Recorded Investment(1)		Interest Income
Impaired mortgage loans with no valuation allowance recorded	$	14,640	$	56	$	2,157	$	33
Impaired mortgage loans with valuation allowance recorded	—		—		—		—
Total impaired mortgage loans	$	14,640	$	56	$	2,157	$	33

(1) Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

The Company did not acquire any impaired mortgage loans during the three months ended March 31, 2018 and 2017. The Company had no mortgage loans that were on a nonaccrual status as of March 31, 2018 and December 31, 2017.

Policy Loans

Policy loans comprised approximately 2.6% of the Company’s total investments as of March 31, 2018 and December 31, 2017, the majority of which are associated with one client. These policy loans present no credit risk because the amount of the loan cannot exceed the obligation due to the ceding company upon the death of the insured or surrender of the underlying policy. The provisions of the treaties in force and the underlying policies determine the policy loan interest rates. The Company earns a spread between the interest rate earned on policy loans and the interest rate credited to corresponding liabilities.

Funds Withheld at Interest

Funds withheld at interest comprised approximately 11.7% and 11.8% of the Company’s total investments as of March 31, 2018 and December 31, 2017, respectively. Of the $6.0 billion funds withheld at interest balance, net of embedded derivatives, as of March 31, 2018, $4.0 billion of the balance is associated with one client. For reinsurance agreements written on a modified coinsurance basis and certain agreements written on a coinsurance funds withheld basis, assets equal to the net statutory reserves are withheld and legally owned and managed by the ceding company and are reflected as funds withheld at interest on the Company’s condensed consolidated balance sheets. In the event of a ceding company’s insolvency, the Company would need to assert a claim on the assets supporting its reserve liabilities. However, the risk of loss to the Company is mitigated by its ability to offset amounts it owes the ceding company for claims or allowances against amounts owed to the Company from the ceding company.

Other Invested Assets

Other invested assets include limited partnership interests, joint ventures (other than operating joint ventures), equity release mortgages, derivative contracts and fair value option (“FVO”) contractholder-directed unit-linked investments. Other invested assets also include FHLB common stock, which is included in other in the table below. Other invested assets represented approximately 2.9% of the Company’s total investments as of March 31, 2018 and December 31, 2017. Carrying values of these assets as of March 31, 2018 and December 31, 2017 are as follows (dollars in thousands):

	March 31, 2018		December 31, 2017
Limited partnership interests and real estate joint ventures	805,613		781,124
Equity release mortgages	261,837		219,940
Derivatives	132,195		137,613
FVO contractholder-directed unit-linked investments	221,512		218,541
Other	90,990		148,114
Total other invested assets	$	1,512,147	$	1,505,332

XML

Derivative Instruments

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

Derivatives, except for embedded derivatives and longevity and mortality swaps, are carried on the Company’s condensed consolidated balance sheets in other invested assets or other liabilities, at fair value. Longevity and mortality swaps are included on the condensed consolidated balance sheets in other assets or other liabilities, at fair value. Embedded derivative assets and liabilities on modified coinsurance or funds withheld arrangements are included on the condensed consolidated balance sheets with the host contract in funds withheld at interest, at fair value. Embedded derivative liabilities on indexed annuity and variable annuity products are included on the condensed consolidated balance sheets with the host contract in interest-sensitive contract liabilities, at fair value. The following table presents the notional amounts and gross fair value of derivative instruments prior to taking into account the netting effects of master netting agreements as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018							December 31, 2017
	Notional		Carrying Value/Fair Value					Notional		Carrying Value/Fair Value
	Amount		Assets			Liabilities		Amount		Assets		Liabilities
Derivatives not designated as hedging instruments:
Interest rate swaps	$	1,021,739	$	47,303		$	152	$	996,204	$	59,809	$	2,372
Financial futures	388,874		—			—		412,438		—		—
Foreign currency forwards	6,012		48			4		6,030		—		28
Consumer price index swaps	218,237		127			427		221,932		—		2,160
Credit default swaps	933,200		7,279			1,058		961,200		8,319		1,651
Equity options	639,801		33,958			—		632,251		23,271		—
Longevity swaps	985,920		44,011			—		960,400		40,659		—
Mortality swaps	—		—			1,683		—		—		1,683
Synthetic guaranteed investment contracts	10,866,171		—			—		10,052,576		—		—
Embedded derivatives in:
Modified coinsurance or funds withheld arrangements	—		135,805			—		—		122,194		—
Indexed annuity products	—		—			827,109		—		—		861,758
Variable annuity products	—		—			137,686		—		—		152,470
Total non-hedging derivatives	15,059,954		268,531			968,119		14,243,031		254,252		1,022,122
Derivatives designated as hedging instruments:
Interest rate swaps	435,000		(1,119		)	16,972		435,000		—		20,389
Foreign currency swaps	598,575		56,403			5,461		672,921		65,207		8,496
Foreign currency forwards	698,241		7,458			225		553,175		1,265		7,720
Total hedging derivatives	1,731,816		62,742			22,658		1,661,096		66,472		36,605
Total derivatives	$	16,791,770	$	331,273		$	990,777	$	15,904,127	$	320,724	$	1,058,727

Netting Arrangements

Certain of the Company’s derivatives are subject to enforceable master netting arrangements and reported as a net asset or liability in the condensed consolidated balance sheets. The Company nets all derivatives that are subject to such arrangements.

The Company has elected to include all derivatives, except embedded derivatives, in the tables below, irrespective of whether they are subject to an enforceable master netting arrangement or a similar agreement. See Note 4 – “Investments” for information regarding the Company’s securities borrowing, lending, repurchase and repurchase/reverse repurchase programs. See “Embedded Derivatives” below for information regarding the Company’s bifurcated embedded derivatives.

The following table provides information relating to the Company’s derivative instruments as of March 31, 2018 and December 31, 2017 (dollars in thousands):

								Gross Amounts Not Offset in the Balance Sheet
	Gross Amounts    Recognized		Gross Amounts Offset in the Balance Sheet			Net Amounts Presented in the Balance Sheet		Financial Instruments (1)			Cash Collateral    Pledged/ Received			Net Amount
March 31, 2018:
Derivative assets	$	195,468	$	(19,262	)	$	176,206	$	—		$	(188,407	)	$	(12,201	)
Derivative liabilities	25,982		(19,262		)	6,720		(57,456		)	(3,470		)	(54,206		)
December 31, 2017:
Derivative assets	$	198,530	$	(20,258	)	$	178,272	$	(862	)	$	(185,900	)	$	(8,490	)
Derivative liabilities	44,499		(20,258		)	24,241		(58,156		)	(22,221		)	(56,136		)

(1) Includes initial margin posted to a central clearing partner.

Accounting for Derivative Instruments and Hedging Activities

The Company does not enter into derivative instruments for speculative purposes. As discussed below under “Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging,” the Company uses various derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment. As of March 31, 2018 and December 31, 2017, the Company held interest rate swaps that were designated and qualified as cash flow hedges of interest rate risk, for variable rate liabilities and foreign currency assets, foreign currency swaps and foreign currency forwards that were designated and qualified as hedges of a portion of its net investment in its foreign operations, foreign currency swaps that were designated and qualified as fair value hedges of foreign currency risk, and derivative instruments that were not designated as hedging instruments. See Note 2 – “Summary of Significant Accounting Policies” of the Company’s 2017 Annual Report for a detailed discussion of the accounting treatment for derivative instruments, including embedded derivatives. Derivative instruments are carried at fair value and generally require an insignificant amount of cash at inception of the contracts.

Fair Value Hedges

The Company designates and reports certain foreign currency swaps to hedge the foreign currency fair value exposure of foreign currency denominated assets as fair value hedges when they meet the requirements of the general accounting principles for Derivatives and Hedging. The gain or loss on the hedged item attributable to a change in foreign currency and the offsetting gain or loss on the related foreign currency swaps as of March 31, 2018 and 2017, were (dollars in thousands):

Type of Fair Value Hedge	Hedged Item	Gains (Losses) Recognized for Derivatives			Gains (Losses) Recognized for Hedged Items			Ineffectiveness Recognized in Investment Related Gains (Losses)
For the three months ended March 31, 2018:
Foreign currency swaps	Foreign-denominated fixed maturity securities	$	(1,891	)	$	1,891		$	—
For the three months ended March 31, 2017:
Foreign currency swaps	Foreign-denominated fixed maturity securities	$	6,536		$	(6,536	)	$	—

A regression analysis was used, both at inception of the hedge and on an ongoing basis, to determine whether each derivative used in a hedged transaction is highly effective in offsetting changes in the hedged item. For the foreign currency swaps, the change in fair value related to changes in the benchmark interest rate and credit spreads are excluded from the hedge effectiveness. For the three months ended March 31, 2018 and 2017, $2.4 million and $1.0 million, respectively, of the change in the estimated fair value of derivatives, was excluded from hedge effectiveness.

Cash Flow Hedges

Certain derivative instruments are designated as cash flow hedges when they meet the requirements of the general accounting principles for Derivatives and Hedging. The Company designates and accounts for the following as cash flows: (i) certain interest rate swaps, in which the cash flows of liabilities are variable based on a benchmark rate; (ii) certain interest rate swaps, in which the cash flows of assets are denominated in different currencies, commonly referred to as cross-currency swaps; and (iii) forward bond purchase commitments.

The following table presents the components of AOCI, before income tax, and the condensed consolidated income statement classification where the gain or loss is recognized related to cash flow hedges for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Three months ended March 31,
	2018			2017
Balance beginning of period	$	2,619		$	(2,496	)
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges	17,817			10,433
Amounts reclassified to investment income	(144		)	(247		)
Amounts reclassified to interest expense	370			—
Balance end of period	$	20,662		$	7,690

As of March 31, 2018, the before-tax deferred net gains (losses) on derivative instruments recorded in AOCI that are expected to be reclassified to earnings during the next twelve months are approximately $0.6 million and $0.7 million in investment income and interest expense, respectively.

The following table presents the effective portion of derivatives in cash flow hedging relationships on the condensed consolidated statements of income and the condensed consolidated statements of comprehensive income for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Effective Portion
Derivative Type	Gain (Loss) Deferred in OCI		Gain (Loss) Reclassified into Income from OCI
			Investment Income		Interest Expense
For the three months ended March 31, 2018:
Interest rate	$	14,986	$	—	$	(370	)
Currency/Interest rate	2,831		144		—
Forward bond purchase commitments	—		—		—
Total	$	17,817	$	144	$	(370	)
For the three months ended March 31, 2017:
Interest rate	$	2,216	$	—	$	—
Currency/Interest rate	8,217		197		—
Forward bond purchase commitments	—		50		—
Total	$	10,433	$	247	$	—

All components of each derivative’s gain or loss were included in the assessment of hedge effectiveness. For the three months ended March 31, 2018 and 2017, the ineffective portion of derivatives reported as cash flow hedges was not material to the Company’s results of operations. Also, there were no material amounts reclassified into earnings relating to instances in which the Company discontinued cash flow hedge accounting because the forecasted transaction did not occur by the anticipated date or within the additional time period permitted by the authoritative guidance for the accounting for derivatives and hedging.

Hedges of Net Investments in Foreign Operations

The Company uses foreign currency swaps and foreign currency forwards to hedge a portion of its net investment in certain foreign operations against adverse movements in exchange rates. The following table illustrates the Company’s net investments in foreign operations (“NIFO”) hedges for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Derivative Gains (Losses) Deferred in AOCI
	For the three months ended March 31,
Type of NIFO Hedge (1) (2)	2018		2017
Foreign currency swaps	$	8,805	$	(7,606	)
Foreign currency forwards	12,236		—

(1) There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.

(2) There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.

The cumulative foreign currency translation gain recorded in AOCI related to these hedges was $134.7 million and $113.7 million at March 31, 2018 and December 31, 2017, respectively. If a hedged foreign operation was sold or substantially liquidated, the amounts in AOCI would be reclassified to the condensed consolidated statements of income. A pro rata portion would be reclassified upon partial sale of a hedged foreign operation.

Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging

The Company uses various other derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment. The gain or loss related to the change in fair value for these derivative instruments is recognized in investment related gains (losses), net in the condensed consolidated statements of income, except where otherwise noted.

A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s condensed consolidated statements of income for the three months ended March 31, 2018 and 2017 is as follows (dollars in thousands):

		Gain (Loss) for the three months ended         March 31,
Type of Non-hedging Derivative	Income Statement Location of Gain (Loss)	2018			2017
Interest rate swaps	Investment related gains (losses), net	$	(26,571	)	$	(2,612	)
Financial futures	Investment related gains (losses), net	129			(12,775		)
Foreign currency forwards	Investment related gains (losses), net	323			904
CPI swaps	Investment related gains (losses), net	2,186			(5		)
Credit default swaps	Investment related gains (losses), net	(402		)	7,358
Equity options	Investment related gains (losses), net	2,593			(17,189		)
Longevity swaps	Other revenues	2,267			1,865
Mortality swaps	Other revenues	—			(395		)
Subtotal		(19,475		)	(22,849		)
Embedded derivatives in:
Modified coinsurance or funds withheld arrangements	Investment related gains (losses), net	13,611			68,702
Indexed annuity products	Interest credited	25,351			(16,402		)
Variable annuity products	Investment related gains (losses), net	14,785			22,363
Total non-hedging derivatives		$	34,272		$	51,814

Types of Derivatives Used by the Company

Interest Rate Swaps

Interest rate swaps are used by the Company primarily to reduce market risks from changes in interest rates, to alter interest rate exposure arising from mismatches between assets and liabilities (duration mismatches) and to manage the risk of cash flows of liabilities that are variable based on a benchmark rate. With an interest rate swap, the Company agrees with another party to exchange, at specified intervals, the difference between two rates, which can be either fixed-rate or floating-rate interest amounts, tied to an agreed-upon notional principal amount. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments at each due date. The Company utilizes interest rate swaps in cash flow and non-qualifying hedging relationships.

Financial Futures

Exchange-traded futures are used primarily to economically hedge liabilities embedded in certain variable annuity products. With exchange-traded futures transactions, the Company agrees to purchase or sell a specified number of contracts, the value of which is determined by the relevant indices, and to post variation margin on a daily basis in an amount equal to the difference between the daily estimated fair values of those contracts. The Company enters into exchange-traded futures with regulated futures commission merchants that are members of the exchange.

Equity Options

Equity index options are used by the Company primarily to hedge minimum guarantees embedded in certain variable annuity products. To hedge against adverse changes in equity indices volatility, the Company buys put options. The contracts are net settled in cash based on differentials in the indices at the time of exercise and the strike price.

Consumer Price Index Swaps

Consumer price index (“CPI”) swaps are used by the Company primarily to economically hedge liabilities embedded in certain insurance products where value is directly affected by changes in a designated benchmark consumer price index. With a CPI swap transaction, the Company agrees with another party to exchange the actual amount of inflation realized over a specified period of time for a fixed amount of inflation determined at inception. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments to be made by the counterparty at each due date. Most of these swaps will require a single payment to be made by one counterparty at the maturity date of the swap.

Foreign Currency Swaps

Foreign currency swaps are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency swap transaction, the Company agrees with another party to exchange, at specified intervals, the difference between one currency and another at a forward exchange rate calculated by reference to an agreed upon principal amount. The principal amount of each currency is exchanged at the termination of the currency swap by each party. The Company uses foreign currency swaps in hedges of net investments in foreign operations, fair value hedges and non-qualifying hedge relationships.

Foreign Currency Forwards

Foreign currency forwards are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency forward transaction, the Company agrees with another party to deliver a specified amount of an identified currency at a specified future date. The price is agreed upon at the time of the contract and payment for such a contract is made in a different currency at the specified future date. The Company uses foreign currency forwards in hedges of net investments in foreign operations and non-qualifying hedge relationships.

Forward Bond Purchase Commitments

Forward bond purchase commitments have been used by the Company to hedge against the variability in the anticipated cash flows required to purchase securities. With forward bond purchase commitments, the forward price is agreed upon at the time of the contract and payment for such contract is made at the future specified settlement date of the securities.

Credit Default Swaps

The Company sells protection under single name credit default swaps and credit default swap index tranches to diversify its credit risk exposure in certain portfolios and, in combination with purchasing securities, to replicate characteristics of similar investments based on the credit quality and term of the credit default swap. Credit default triggers for indexed reference entities and single name reference entities are defined in the contracts. The Company’s maximum exposure to credit loss equals the notional value for credit default swaps. In the event of default of a referencing entity, the Company is typically required to pay the protection holder the full notional value less a recovery amount determined at auction.

The following table presents the estimated fair value, maximum amount of future payments and weighted average years to maturity of credit default swaps sold by the Company at March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018						December 31, 2017
Rating Agency Designation of Referenced Credit Obligations(1)	Estimated Fair Value of Credit   Default Swaps			Maximum Amount of Future Payments under Credit Default Swaps(2)		Weighted Average Years to Maturity(3)	Estimated Fair Value of Credit   Default Swaps			Maximum Amount of Future Payments under Credit Default Swaps(2)		Weighted Average Years to Maturity(3)
AAA/AA+/AA/AA-/A+/A/A-
Single name credit default swaps	$	2,761		$	152,000	3.0	$	3,128		$	162,000	2.9
Subtotal	2,761			152,000		3.0	3,128			162,000		2.9
BBB+/BBB/BBB-
Single name credit default swaps	4,203			333,700		2.8	4,469			361,700		2.9
Credit default swaps referencing indices	156			422,600		3.7	(55		)	422,600		4.0
Subtotal	4,359			756,300		3.3	4,414			784,300		3.5
BB+/BB/BB-
Single name credit default swaps	(25		)	15,000		1.5	30			5,000		1.5
Subtotal	(25		)	15,000		1.5	30			5,000		1.5
Total	$	7,095		$	923,300	3.2	$	7,572		$	951,300	3.4

(1) The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).

(2) Assumes the value of the referenced credit obligations is zero.

(3) The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

The Company also purchases credit default swaps to reduce its risk against a drop in bond prices due to credit concerns of certain bond issuers. If a credit event, as defined by the contract, occurs, the Company is able to put the bond back to the counterparty at par.

Longevity Swaps

The Company enters into longevity swaps in the form of out-of-the-money options, which provide protection against changes in mortality improvement to retirement plans and insurers of such plans. With a longevity swap transaction, the Company agrees with another party to exchange a proportion of a notional value. The proportion is determined by the difference between a predefined benefit, and the realized benefit plus the future expected benefit, calculated by reference to a population index for a fixed premium.

Mortality Swaps

Mortality swaps have been used by the Company to hedge risk from changes in mortality experience associated with its reinsurance of life insurance risk. The Company agrees with another party to exchange, at specified intervals, a proportion of a notional value determined by the difference between a predefined expected and realized claim amount on a designated index of reinsured lives, for a fixed percentage (premium) each term. The mortality swaps matured in 2017 and an accrued liability for amounts owed to the counterparty is recorded in other liabilities at March 31, 2018.

Synthetic Guaranteed Investment Contracts

The Company sells fee-based synthetic guaranteed investment contracts to retirement plans which include investment-only, stable value contracts. The assets are owned by the trustees of such plans, who invest the assets under the terms of investment guidelines to which the Company agrees. The contracts contain a guarantee of a minimum rate of return on participant balances supported by the underlying assets, and a guarantee of liquidity to meet certain participant-initiated plan cash flow requirements. These contracts are reported as derivatives and recorded at fair value.

Embedded Derivatives

The Company has certain embedded derivatives which are required to be separated from their host contracts and reported as derivatives. Host contracts include reinsurance treaties structured on a modified coinsurance (“modco”) or funds withheld basis. Additionally, the Company reinsures equity-indexed annuity and variable annuity contracts with benefits that are considered embedded derivatives, including guaranteed minimum withdrawal benefits, guaranteed minimum accumulation benefits, and guaranteed minimum income benefits. The changes in fair values of embedded derivatives on equity-indexed annuities described below relate to changes in the fair value associated with capital market and other related assumptions. The Company’s utilization of a credit valuation adjustment (“CVA”) did not have a material effect on the change in fair value of its embedded derivatives for the three months ended March 31, 2018 and 2017.

The related gains (losses) and the effect on net income after amortization of deferred acquisition costs (“DAC”) and income taxes for the three months ended March 31, 2018 and 2017 are reflected in the following table (dollars in thousands):

	Three months ended March 31,
	2018		2017
Embedded derivatives in modco or funds withheld arrangements included in investment related gains	$	13,611	$	68,702
After the associated amortization of DAC and taxes, the related amounts included in net income	6,850		25,844
Embedded derivatives in variable annuity contracts included in investment related gains	14,785		22,363
After the associated amortization of DAC and taxes, the related amounts included in net income	11,126		28,836
Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses	25,351		(16,402		)
After the associated amortization of DAC and taxes, the related amounts included in net income	6,537		(21,396		)

Credit Risk

The Company manages its credit risk related to over-the-counter (“OTC”) derivatives by entering into transactions with creditworthy counterparties, maintaining collateral arrangements and through the use of master netting agreements that provide for a single net payment to be made by one counterparty to another at each due date and upon termination.

The credit exposure of the Company’s OTC derivative transactions is represented by the contracts with a positive fair value (market value) at the reporting date. To reduce credit exposures, the Company seeks to (i) enter into OTC derivative transactions pursuant to master netting agreements that provide for a netting of payments and receipts with a single counterparty, and (ii) enter into agreements that allow the use of credit support annexes, which are bilateral rating-sensitive agreements that require collateral postings at established threshold levels. Certain of the Company’s OTC derivatives are cleared derivatives, which are bilateral transactions between the Company and a counterparty where the transactions are cleared through a clearinghouse, such that each derivative counterparty is only exposed to the default of the clearinghouse. These cleared transactions require initial and daily variation margin collateral postings and include certain interest rate swaps and credit default swaps entered into on or after June 10, 2013, related to guidelines implemented under the Dodd-Frank Wall Street Reform and Consumer Protection Act. In 2017, the Company followed the Chicago Mercantile Exchange amended rulebook to legally characterize variation margin payments as settlements of the derivative’s mark-to-market exposure and not collateral. Also, the Company enters into exchange-traded futures through regulated exchanges and these transactions are settled on a daily basis, thereby reducing credit risk exposure in the event of non-performance by counterparties to such financial instruments.

The Company enters into various collateral arrangements, which require both the posting and accepting of collateral in connection with its derivative instruments. Collateral agreements contain attachment thresholds that may vary depending on the posting party’s ratings. Additionally, a decline in the Company’s or the counterparty’s credit ratings to specified levels could result in potential settlement of the derivative positions under the Company’s agreements with its counterparties. The Company also has exchange-traded futures, which require the maintenance of a margin account. As exchange-traded futures are affected through regulated exchanges, and positions are marked to market on a daily basis, the Company has minimal exposure to credit-related losses in the event of nonperformance by counterparties.

The Company’s credit exposure related to derivative contracts is generally limited to the fair value at the reporting date plus or minus any collateral posted or held by the Company. Information regarding the Company’s credit exposure related to its over-the-counter derivative contracts, centrally cleared derivative contracts and margin account for exchange-traded futures at March 31, 2018 and December 31, 2017 are reflected in the following table (dollars in thousands):

	March 31, 2018			December 31, 2017
Estimated fair value of derivatives in net asset position	$	171,169		$	155,714
Cash provided as collateral(1)	3,470			22,221
Securities pledged to counterparties as collateral(2)	57,456			58,156
Cash pledged from counterparties as collateral(3)	(188,407		)	(185,900		)
Securities pledged from counterparties as collateral(4)	—			(862		)
Initial margin for cleared derivatives(2)	(57,456		)	(58,156		)
Net amount after application of master netting agreements and collateral	$	(13,768	)	$	(8,827	)
Margin account related to exchange-traded futures(5)	$	7,382		$	6,538

(1) Consists of receivable from counterparty, included in other assets.

(2) Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.

(3) Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.

(4) Consists of U.S. Treasury and government securities.

(5) Included in other assets.

XML

Fair Value of Assets and Liabilities

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Disclosures

Fair Value of Assets and Liabilities

Fair Value Measurement

General accounting principles for Fair Value Measurements and Disclosures define fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. These principles also establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value and describes three levels of inputs that may be used to measure fair value:

Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. The Company’s Level 1 assets and liabilities are traded in active exchange markets.

Level 2 - Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or market standard valuation techniques and assumptions that use significant inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the related assets or liabilities. Prices are determined using valuation methodologies such as discounted cash flow models and other similar techniques that require management’s judgment or estimation in developing inputs that are consistent with what other market participants would use when pricing similar assets and liabilities. Additionally, the Company’s embedded derivatives, all of which are associated with reinsurance treaties and longevity and mortality swaps, are classified in Level 3 since their values include significant unobservable inputs.

For a discussion of the Company’s valuation methodologies for assets and liabilities measured at fair value and the fair value hierarchy, see Note 6 in the Notes to Consolidated Financial Statements included in the Company’s 2017 Annual Report.

Assets and Liabilities by Hierarchy Level

Assets and liabilities measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 are summarized below (dollars in thousands):

March 31, 2018:				Fair Value Measurements Using:
	Total			Level 1		Level 2			Level 3
Assets:
Fixed maturity securities – available-for-sale:
Corporate	$	23,520,469		$	—	$	22,221,205		$	1,299,264
Canadian government	4,097,854			—		3,525,107			572,747
RMBS	1,787,148			—		1,666,534			120,614
ABS	1,734,722			—		1,604,016			130,706
CMBS	1,281,933			—		1,280,049			1,884
U.S. government	1,436,114			1,313,806		101,255			21,053
State and political subdivisions	713,513			—		671,637			41,876
Other foreign government	3,373,507			—		3,368,503			5,004
Total fixed maturity securities – available-for-sale	37,945,260			1,313,806		34,438,306			2,193,148
Equity securities	103,983			67,831		—			36,152
Funds withheld at interest – embedded derivatives	135,805			—		—			135,805
Cash equivalents	538,761			538,761		—			—
Short-term investments	58,499			67		55,215			3,217
Other invested assets:
Derivatives:
Interest rate swaps	40,812			—		40,812			—
Foreign currency forwards	6,932			—		6,932			—
CPI swaps	(99		)	—		(99		)	—
Credit default swaps	5,465			—		5,465			—
Equity options	27,140			—		27,140			—
Foreign currency swaps	51,945			—		51,945			—
FVO contractholder-directed unit-linked investments	221,512			221,043		469			—
Total other invested assets	353,707			221,043		132,664			—
Other assets - longevity swaps	44,011			—		—			44,011
Total	$	39,180,026		$	2,141,508	$	34,626,185		$	2,412,333
Liabilities:
Interest sensitive contract liabilities – embedded derivatives	$	964,795		$	—	$	—		$	964,795
Other liabilities:
Derivatives:
Interest rate swaps	11,752			—		11,752			—
Foreign currency forwards	(345		)	—		(345		)	—
CPI swaps	201			—		201			—
Credit default swaps	(756		)	—		(756		)	—
Equity options	(6,818		)	—		(6,818		)	—
Foreign currency swaps	1,003			—		1,003			—
Mortality swaps	1,683			—		—			1,683
Total	$	971,515		$	—	$	5,037		$	966,478

December 31, 2017:				Fair Value Measurements Using:
	Total			Level 1		Level 2			Level 3
Assets:
Fixed maturity securities – available-for-sale:
Corporate	$	23,210,968		$	—	$	21,873,696		$	1,337,272
Canadian government	4,220,076			—		3,626,134			593,942
RMBS	1,719,880			—		1,611,998			107,882
ABS	1,648,362			—		1,524,888			123,474
CMBS	1,303,387			—		1,300,153			3,234
U.S. government	1,943,592			1,818,006		103,075			22,511
State and political subdivisions	703,428			—		662,225			41,203
Other foreign government	3,401,127			—		3,396,035			5,092
Total fixed maturity securities – available-for-sale	38,150,820			1,818,006		34,098,204			2,234,610
Equity securities:
Non-redeemable preferred stock	39,806			39,806		—			—
Other equity securities	60,346			60,346		—			—
Funds withheld at interest – embedded derivatives	122,194			—		—			122,194
Cash equivalents	356,788			354,071		2,717			—
Short-term investments	50,746			—		47,650			3,096
Other invested assets:
Derivatives:
Interest rate swaps	51,359			—		51,359			—
Foreign currency forwards	730			—		730			—
CPI swaps	(221		)	—		(221		)	—
Credit default swaps	5,908			—		5,908			—
Equity options	16,932			—		16,932			—
Foreign currency swaps	62,905			—		62,905			—
FVO contractholder-directed unit-linked investments	218,541			217,618		923			—
Total other invested assets	356,154			217,618		138,536			—
Other assets - longevity swaps	40,659			—		—			40,659
Total	$	39,177,513		$	2,489,847	$	34,287,107		$	2,400,559
Liabilities:
Interest sensitive contract liabilities – embedded derivatives	$	1,014,228		$	—	$	—		$	1,014,228
Other liabilities:
Derivatives:
Interest rate swaps	14,311			—		14,311			—
Foreign currency forwards	7,213			—		7,213			—
CPI swaps	1,939			—		1,939			—
Credit default swaps	(760		)	—		(760		)	—
Equity options	(6,339		)	—		(6,339		)	—
Foreign currency swaps	6,194			—		6,194			—
Mortality swaps	1,683			—		—			1,683
Total	$	1,038,469		$	—	$	22,558		$	1,015,911

Transfers between Levels 1 and 2

Transfers between Levels 1 and 2 are made to reflect changes in observability of inputs and market activity. There were no transfers between Level 1 and Level 2 for the quarter ended March 31, 2018. The Company recognizes transfers of assets and liabilities into and out of levels within the fair value hierarchy at the beginning of the quarter in which the actual event or change in circumstances that caused the transfer occurs. The following tables present the transfers between Level 1 and Level 2 during the three months ended March 31, 2017 (dollars in thousands):

	2017
	Transfers from     Level 1 to Level 2		Transfers from     Level 2 to Level 1
Fixed maturity securities - available-for-sale:
Corporate	$	—	$	38,675

Quantitative Information Regarding Internally - Priced Level 3 Assets and Liabilities

The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements that are developed internally by the Company as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	Estimated Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
	March 31, 2018	December 31, 2017			March 31, 2018		December 31, 2017
Assets:
Corporate	$183,680	$173,579	Market comparable securities	Liquidity premium	0-2% (1%)		0-2%  (1%)
				EBITDA Multiple	5.9X - 7.5X (6.6X)		—
U.S. government	21,053	22,511	Market comparable securities	Liquidity premium	0-1% (1%)		0-1%  (1%)
State and political subdivisions	4,452	4,616	Market comparable securities	Liquidity premium	1	%	1	%
Equity securities	25,987	—	Market comparable securities	Liquidity premium	3%		—
				EBITDA Multiple	6.9X - 13.1X (8.0X)		—
Funds withheld at interest- embedded derivatives	135,805	122,194	Total return swap	Mortality	0-100%  (2%)		0-100%  (2%)
				Lapse	0-35%  (9%)		0-35%  (9%)
				Withdrawal	0-5%  (3%)		0-5%  (3%)
				CVA	0-5%  (1%)		0-5%  (1%)
				Crediting rate	2-4%  (2%)		2-4%  (2%)
Longevity swaps	44,011	40,659	Discounted cash flow	Mortality	0-100%  (2%)		0-100%  (2%)
				Mortality improvement	(10%)-10%   (3%)		(10%)-10%   (3%)
Liabilities:
Interest sensitive contract liabilities- embedded derivatives- indexed annuities	827,109	861,758	Discounted cash flow	Mortality	0-100%  (2%)		0-100% (2%)
				Lapse	0-35%  (9%)		0-35% (9%)
				Withdrawal	0-5%  (3%)		0-5% (3%)
				Option budget projection	2-4%  (2%)		2-4% (2%)
Interest sensitive contract liabilities- embedded derivatives- variable annuities	137,686	152,470	Discounted cash  flow	Mortality	0-100% (1%)		0-100% (1%)
				Lapse	0-25% (5%)		0-25% (5%)
				Withdrawal	0-7% (4%)		0-7% (3%)
				CVA	0-5% (1%)		0-5% (1%)
				Long-term volatility	0-27% (13%)		0-27% (8%)
Mortality swaps	1,683	1,683	Discounted cash flow	Mortality	0-100%  (1%)		0-100%  (1%)

Changes in Level 3 Assets and Liabilities

Assets and liabilities transferred into Level 3 are due to a lack of observable market transactions and price information. Assets and liabilities are transferred out of Level 3 when circumstances change such that significant inputs can be corroborated with market observable data. This may be due to a significant increase in market activity for the asset or liability, a specific event, one or more significant input(s) becoming observable. Transfers out of Level 3 were primarily the result of the Company obtaining observable pricing information or a third party pricing quotation that appropriately reflects the fair value of those assets and liabilities. In addition, certain transfers out of Level 3 were also due to ratings upgrades on mortgage-backed securities that had previously had below investment-grade ratings. The Company also transferred equity securities with a fair value of approximately $38.9 million into Level 3 as a result of the adoption of the new accounting guidance for the recognition and measurement of equity securities.

For further information on the Company’s valuation processes, see Note 6 in the Notes to Consolidated Financial Statements included in the Company’s 2017 Annual Report.

The reconciliations for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows (dollars in thousands):

For the three months ended March 31, 2018:	Fixed maturity securities - available-for-sale
	Corporate			Canadian government			RMBS			ABS
Fair value, beginning of period	$	1,337,272		$	593,942		$	107,882		$	123,474
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	(361		)	3,444			(92		)	106
Investment related gains (losses), net	—			—			—			2
Included in other comprehensive income	(32,852		)	(24,639		)	(1,110		)	853
Purchases(1)	100,170			—			20,916			11,000
Sales(1)	(6,180		)	—			—			—
Settlements(1)	(75,146		)	—			(2,963		)	(2,739		)
Transfers into Level 3	7,166			—			—			—
Transfers out of Level 3	(30,805		)	—			(4,019		)	(1,990		)
Fair value, end of period	$	1,299,264		$	572,747		$	120,614		$	130,706
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	(361	)	$	3,444		$	(92	)	$	106

For the three months ended March 31, 2018 (continued):	Fixed maturity securities - available-for-sale
	CMBS			U.S. government			State and political subdivisions			Other foreign government
Fair value, beginning of period	$	3,234		$	22,511		$	41,203		$	5,092
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	—			(110		)	8			—
Included in other comprehensive income	(47		)	(340		)	700			(88		)
Purchases(1)	—			96			—			—
Settlements(1)	(1		)	(1,104		)	(35		)	—
Transfers out of Level 3	(1,302		)	—			—			—
Fair value, end of period	$	1,884		$	21,053		$	41,876		$	5,004
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	—		$	(110	)	$	8		$	—

For the three months ended March 31, 2018 (continued):	Equity securities			Funds withheld at interest- embedded derivatives		Short-term Investments			Other assets - longevity swaps		Interest sensitive contract liabilities embedded derivatives			Other liabilities - mortality swaps
Fair value, beginning of period	$	—		$	122,194	$	3,096		$	40,659	$	(1,014,229	)	$	(1,683	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment related gains (losses), net	(2,677		)	13,611		—			—		14,785			—
Interest credited	—			—		—			—		25,351			—
Included in other comprehensive income	—			—		(25		)	1,085		—			—
Other revenues	—			—		—			2,267		—			—
Purchases(1)	—			—		146			—		(8,508		)	—
Sales(1)	(28		)	—		—			—		—			—
Settlements(1)	(48		)	—		—			—		17,807			—
Transfers into Level 3	38,905			—		—			—		—			—
Fair value, end of period	$	36,152		$	135,805	$	3,217		$	44,011	$	(964,794	)	$	(1,683	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	—		$	—	$	—		$	—	$	—		$	—
Investment related gains (losses), net	(2,705		)	13,611		—			—		12,901			—
Other revenues	—			—		—			2,267		—			—
Interest credited	—			—		—			—		7,544			—

For the three months ended March 31, 2017:	Fixed maturity securities - available-for-sale
	Corporate			Canadian governments		RMBS			ABS			CMBS			U.S. government
Fair value, beginning of period	$	1,272,253		$	475,965	$	160,291		$	219,280		$	21,145		$	24,488
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	(423		)	3,070		(245		)	1,018			709			(117		)
Investment related gains (losses), net	(1,231		)	—		365			—			(595		)	—
Included in other comprehensive income	4,948			4,525		650			5,767			(83		)	52
Purchases(1)	45,914			—		16,499			10,849			—			104
Sales(1)	—			—		(10,604		)	—			(3,720		)	—
Settlements(1)	(71,470		)	—		(6,784		)	(18,154		)	(5,401		)	(1,053		)
Transfers into Level 3	13,934			—		77			35,258			—			—
Transfers out of Level 3	—			—		(16,819		)	(45,582		)	(10,132		)	—
Fair value, end of period	$	1,263,925		$	483,560	$	143,430		$	208,436		$	1,923		$	23,474
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	(423	)	$	3,070	$	(91	)	$	161		$	—		$	(117	)
Investment related gains (losses), net	(1,293		)	—		(346		)	—			—			—

For the three months ended March 31, 2017 (continued):	Fixed maturity securities available-for-sale
	State and political subdivisions			Other foreign government			Funds withheld at interest- embedded derivatives			Short-term Investments			Other assets - longevity swaps		Interest sensitive contract liabilities embedded derivatives			Other liabilities - mortality swaps
Fair value, beginning of period	$	41,666		$	12,869		$	(22,529	)	$	3,346		$	26,958	$	(990,308	)	$	(2,462	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	(88		)	—			—			—			—		—			—
Investment related gains (losses), net	—			—			68,702			—			—		22,362			—
Interest credited	—			—			—			—			—		(16,402		)	—
Included in other comprehensive income	(843		)	(191		)	—			33			347		—			—
Other revenues	—			—			—			—			1,865		—			(395		)
Purchases(1)	—			—			—			32			—		(6,393		)	—
Settlements(1)	(33		)	(334		)	—			(135		)	—		17,811			—
Transfers out of Level 3	(6,844		)	—			—			—			—		—			—
Fair value, end of period	$	33,858		$	12,344		$	46,173		$	3,276		$	29,170	$	(972,930	)	$	(2,857	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	(88	)	$	—		$	—		$	—		$	—	$	—		$	—
Investment related gains (losses), net	—			—			68,702			—			—		20,300			—
Other revenues	—			—			—			—			1,865		—			(395		)
Interest credited	—			—			—			—			—		(34,214		)	—

(1) The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

Nonrecurring Fair Value Measurements

During the three months ended March 31, 2018 and March 31, 2017, the Company did not have any adjustments to its assets or liabilities measured at fair value on a nonrecurring basis that are still held at the reporting date.

Fair Value of Financial Instruments

The Company is required by general accounting principles for Fair Value Measurements and Disclosures to disclose the fair value of certain financial instruments including those that are not carried at fair value. The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments, which were not measured at fair value on a recurring basis, as of March 31, 2018 and December 31, 2017 (dollars in thousands). For additional information regarding the methods and significant assumptions used by the Company to estimate these fair values, see Note 6 in the Notes to Consolidated Financial Statements included in the Company’s 2017 Annual Report. This table excludes any payables or receivables for collateral under repurchase agreements and other transactions. The estimated fair value of the excluded amount approximates carrying value as they equal the amount of cash collateral received/paid.

March 31, 2018:	Carrying Value (1)		Estimated  Fair Value		Fair Value Measurement Using:
					Level 1		Level 2		Level 3		NAV
Assets:
Mortgage loans on real estate	$	4,437,994	$	4,411,472	$	—	$	—	$	4,411,472	$	—
Policy loans	1,346,930		1,346,930		—		1,346,930		—		—
Funds withheld at interest	5,865,791		6,098,479		—		—		6,098,479		—
Cash and cash equivalents	971,646		971,646		971,646		—		—		—
Short-term investments	71,931		71,931		71,931		—		—		—
Other invested assets	690,200		710,009		10,165		68,903		283,205		347,736
Accrued investment income	408,338		408,338		—		408,338		—		—
Liabilities:
Interest-sensitive contract liabilities	$	13,169,951	$	13,151,162	$	—	$	—	$	13,151,162	$	—
Long-term debt	2,788,240		2,916,200		—		—		2,916,200		—
Collateral finance and securitization notes	753,393		692,696		—		—		692,696		—
December 31, 2017:
Assets:
Mortgage loans on real estate	$	4,400,533	$	4,477,654	$	—	$	—	$	4,477,654	$	—
Policy loans	1,357,624		1,357,624		—		1,357,624		—		—
Funds withheld at interest	5,955,092		6,275,623		—		—		6,275,623		—
Cash and cash equivalents	946,736		946,736		946,736		—		—		—
Short-term investments	42,558		42,558		42,558		—		—		—
Other invested assets	651,792		679,377		28,540		67,778		247,934		335,125
Accrued investment income	392,721		392,721		—		392,721		—		—
Liabilities:
Interest-sensitive contract liabilities	$	12,683,872	$	12,917,243	$	—	$	—	$	12,917,243	$	—
Long-term debt	2,788,365		2,959,912		—		—		2,959,912		—
Collateral finance and securitization notes	783,938		722,145		—		—		722,145		—

(1) Carrying values presented herein may differ from those in the Company’s condensed consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.

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Segment Information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

Segment Information

The accounting policies of the segments are the same as those described in the Summary of Significant Accounting Policies in Note 2 of the consolidated financial statements accompanying the 2017 Annual Report. The Company measures segment performance primarily based on profit or loss from operations before income taxes. There are no intersegment reinsurance transactions and the Company does not have any material long-lived assets.

The Company allocates capital to its segments based on an internally developed economic capital model, the purpose of which is to measure the risk in the business and to provide a basis upon which capital is deployed. The economic capital model considers the unique and specific nature of the risks inherent in the Company’s businesses. As a result of the economic capital allocation process, a portion of investment income is attributed to the segments based on the level of allocated capital. In addition, the segments are charged for excess capital utilized above the allocated economic capital basis. This charge is included in policy acquisition costs and other insurance expenses.

The Company has geographic-based and business-based operational segments. Geographic-based operations are further segmented into traditional and financial solutions businesses. Information related to revenues, income (loss) before income taxes and total assets of the Company for each reportable segment are summarized below (dollars in thousands):

	Three months ended March 31,
Revenues:	2018		2017
U.S. and Latin America:
Traditional	$	1,489,694	$	1,488,503
Financial Solutions	213,352		298,846
Total	1,703,046		1,787,349
Canada:
Traditional	302,319		264,275
Financial Solutions	12,777		11,807
Total	315,096		276,082
Europe, Middle East and Africa:
Traditional	393,782		318,086
Financial Solutions	88,143		79,989
Total	481,925		398,075
Asia Pacific:
Traditional	614,539		505,230
Financial Solutions	19,846		20,452
Total	634,385		525,682
Corporate and Other	39,255		21,552
Total	$	3,173,707	$	3,008,740

	Three months ended March 31,
Income (loss) before income taxes:	2018			2017
U.S. and Latin America:
Traditional	$	2,892		$	29,960
Financial Solutions	67,421			103,586
Total	70,313			133,546
Canada:
Traditional	23,707			19,328
Financial Solutions	3,191			3,592
Total	26,898			22,920
Europe, Middle East and Africa:
Traditional	15,421			13,976
Financial Solutions	39,164			31,918
Total	54,585			45,894
Asia Pacific:
Traditional	22,887			41,688
Financial Solutions	4,021			5,872
Total	26,908			47,560
Corporate and Other	(40,779		)	(42,076		)
Total	$	137,925		$	207,844

Assets:	March 31, 2018		December 31, 2017
U.S. and Latin America:
Traditional	$	18,839,888	$	18,603,423
Financial Solutions	16,349,148		15,959,206
Total	35,189,036		34,562,629
Canada:
Traditional	4,234,253		4,161,452
Financial Solutions	126,747		126,372
Total	4,361,000		4,287,824
Europe, Middle East and Africa:
Traditional	3,385,127		3,099,495
Financial Solutions	5,279,499		5,274,993
Total	8,664,626		8,374,488
Asia Pacific:
Traditional	5,095,054		4,915,442
Financial Solutions	1,175,002		1,198,585
Total	6,270,056		6,114,027
Corporate and Other	6,470,105		7,175,850
Total	$	60,954,823	$	60,514,818

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Commitments, Contingencies and Guarantees

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

Commitments, Contingencies and Guarantees

Commitments

Funding of Investments

The Company’s commitments to fund investments as of March 31, 2018 and December 31, 2017 are presented in the following table (dollars in thousands):

	March 31, 2018		December 31, 2017
Limited partnership interests and joint ventures	$	482,149	$	485,197
Commercial mortgage loans	67,837		40,815
Bank loans and private placements	96,808		60,472
Equity release mortgages	132,523		153,937

The Company anticipates that the majority of its current commitments will be invested over the next five years; however, these commitments could become due any time at the request of the counterparties. Bank loans and private placements are included in fixed maturity securities available-for-sale.

Contingencies

Litigation

The Company is subject to litigation in the normal course of its business. The Company currently has no material litigation. A legal reserve is established when the Company is notified of an arbitration demand or litigation or is notified that an arbitration demand or litigation is imminent, it is probable that the Company will incur a loss as a result and the amount of the probable loss is reasonably capable of being estimated.

Other Contingencies

The Company indemnifies its directors and officers as provided in its charters and by-laws. Since this indemnity generally is not subject to limitation with respect to duration or amount, the Company does not believe that it is possible to determine the maximum potential amount due under this indemnity in the future.

Guarantees

Statutory Reserve Support

RGA, through wholly-owned subsidiaries, has committed to provide statutory reserve support to third parties, in exchange for a fee, by funding loans if certain defined events occur. Such statutory reserves are required under the U.S. Valuation of Life Policies Model Regulation (commonly referred to as Regulation XXX for term life insurance policies and Regulation A-XXX for universal life secondary guarantees). The third parties have recourse to RGA should the subsidiary fail to provide the required funding, however, as of March 31, 2018, the Company does not believe that it will be required to provide any funding under these commitments as the occurrence of the defined events is considered remote. The following table presents the maximum potential obligation for these commitments as of March 31, 2018 (dollars in millions):

Commitment Period	Maximum Potential Obligation
2023	$	500.0
2033	450.0
2034	2,000.0
2035	1,314.2
2036	1,932.0
2037	6,750.0
2038	800.0

Other Guarantees

RGA has issued guarantees to third parties on behalf of its subsidiaries for the payment of amounts due under certain securities borrowing and repurchase arrangements, financing arrangements and office lease obligations, whereby, if a subsidiary fails to meet an obligation, RGA or one of its other subsidiaries will make a payment to fulfill the obligation. Additionally, in limited circumstances, treaty guarantees are granted to ceding companies in order to provide them additional security, particularly in cases where RGA’s subsidiary is relatively new, unrated, or not of a significant size, relative to the ceding company. Liabilities supported by the treaty guarantees, before consideration for any legally offsetting amounts due from the guaranteed party are reflected on the Company’s condensed consolidated balance sheets in future policy benefits. Potential guaranteed amounts of future payments will vary depending on production levels and underwriting results. Guarantees related to securities borrowing and repurchase arrangements provide additional security to third parties should a subsidiary fail to provide securities when due. RGA’s guarantees issued as of March 31, 2018 and December 31, 2017 are reflected in the following table (dollars in thousands):

	March 31, 2018		December 31, 2017
Treaty guarantees	$	949,443	$	1,047,449
Treaty guarantees, net of assets in trust	832,487		926,393
Securities borrowing and repurchase arrangements	291,325		294,325
Financing arrangements	77,858		86,183
Lease obligations	1,465		1,662

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Income Tax Income Tax

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

Income Tax

The Company's effective tax rates differed from the applicable U.S. federal income tax statutory rates of 21% and 35% as a result of the following for the three months ended March 31, 2018 and 2017, respectively (dollars in thousands):

	Three months ended March 31,
	2018			2017
Tax provision at U.S. statutory rate	$	28,964		$	72,745
Increase (decrease) in income taxes resulting from:
U.S. Tax Reform provisional adjustments	775			—
Foreign tax rate differing from U.S. tax rate	1,432			(6,153		)
Differences in tax bases in foreign jurisdictions	(5,760		)	(3,383		)
Deferred tax valuation allowance	7,947			1,182
Amounts related to tax audit contingencies	835			611
Corporate rate changes	111			(1,237		)
Subpart F	658			186
Foreign tax credits	(572		)	(126		)
Global intangible low-taxed income, net of credit	4,409			—
Return to provision adjustments	—			229
Equity compensation excess benefit	(1,114		)	(1,856		)
Other, net	10			134
Total provision for income taxes	$	37,695		$	62,332
Effective tax rate	27.3		%	30.0		%

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“U.S. Tax Reform”) was signed into law. U.S. Tax Reform makes broad and complex changes to the U.S. tax code, including but not limited to, (1) reducing the U.S. federal corporate tax rate from 35% to 21%; (2) requiring companies to pay a one-time transition tax on certain unrepatriated earnings of foreign subsidiaries; (3) generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries; (4) eliminating the corporate alternative minimum tax (“AMT”) and changing how existing AMT credits can be realized; (5) creating the base erosion anti-abuse tax (“BEAT”), a new minimum tax; (6) establishing a new provision designed to tax global intangible low-taxed income (“GILTI”), which allows for the possibility of using foreign tax credits and a deduction of up to 50 percent to offset the income tax liability (subject to some limitations); and (7) changing rules related to uses and limitations of net operating loss carryforwards created in tax years beginning after December 31, 2017.

Companies subject to GILTI have the option to account for the GILTI tax as a period cost if and when incurred, or to recognize deferred taxes for temporary differences including outside basis differences expected to reverse as GILTI. The Company has not yet made a policy election to account for GILTI, but included an estimate of the current GILTI impact in the tax provision.

As of March 31, 2018, the Company has not yet completed its accounting for the tax effects of the enactment of the U.S. Tax Reform. The Company continues to gather additional information to account for the effects of U.S. Tax Reform such as information to more precisely compute the pretax deferred tax items upon which the change in rate was applied and refine the necessary valuation allowance related to the foreign tax credits. Also, the Company also continues to monitor new regulatory and accounting guidance which could impact the provisional balances recorded as of December 31, 2017.

The effective tax rate for the three months ended March 31, 2018 was higher than the U.S. Statutory rate of 21.0% primarily as a result of income in non-U.S. jurisdictions with higher tax rates than the U.S., the inclusion of U.S. tax related to GILTI and losses in foreign jurisdictions for which the company established a valuation allowance. The higher rate was partially offset with tax benefits related to bases differences in non-U.S. jurisdictions.

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Employee Benefit Plans

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Employee Benefit Plans

Employee Benefit Plans

The components of net periodic benefit cost, included in other operating expenses on the condensed consolidated statements of income, for the three months ended March 31, 2018 and 2017 were as follows (dollars in thousands):

	Pension Benefits						Other Benefits
	Three months ended March 31,						Three months ended March 31,
	2018			2017			2018			2017
Service cost	$	2,654		$	2,580		$	636		$	721
Interest cost	1,330			1,198			530			565
Expected return on plan assets	(1,554		)	(1,285		)	—			—
Amortization of prior service cost (credit)	83			74			(329		)	(156		)
Amortization of prior actuarial losses	1,094			1,081			498			457
Settlements	—			257			—			—
Net periodic benefit cost	$	3,607		$	3,905		$	1,335		$	1,587

The Company made no pension contributions during the first three months of 2018 and expects to make pension contributions between $8.0 million and $10.0 million in 2018.

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Reinsurance

3 Months Ended

Mar. 31, 2018

Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract]

Retrocession Arrangements and Reinsurance Ceded Receivables

Reinsurance

Retrocession reinsurance treaties do not relieve the Company from its obligations to direct writing companies. Failure of retrocessionaires to honor their obligations could result in losses to the Company. Consequently, allowances would be established for amounts deemed uncollectible. At March 31, 2018 and December 31, 2017, no allowances were deemed necessary. The Company regularly evaluates the financial condition of the insurance companies from which it assumes and to which it cedes reinsurance.

Retrocessions are arranged through the Company’s retrocession pools for amounts in excess of the Company’s retention limit. As of March 31, 2018 and December 31, 2017, all rated retrocession pool participants followed by the A.M. Best Company were rated “A- (excellent)” or better. The Company verifies retrocession pool participants’ ratings on a quarterly basis. For a majority of the retrocessionaires that were not rated, security in the form of letters of credit or trust assets has been posted. In addition, the Company performs annual financial reviews of its retrocessionaires to evaluate financial stability and performance. In addition to its third party retrocessionaires, various RGA reinsurance subsidiaries retrocede amounts in excess of their retention to affiliated subsidiaries.

The following table presents information for the Company’s reinsurance ceded receivable assets, including the respective amount and A.M. Best rating for each reinsurer representing in excess of five percent of the total as of March 31, 2018 and December 31, 2017 (dollars in thousands):

		March 31, 2018				December 31, 2017
Reinsurer	A.M. Best Rating	Amount		% of Total		Amount		% of Total
Reinsurer A	A+	$	317,136	39.1	%	$	301,478	38.6	%
Reinsurer B	A+	203,137		25.1		203,898		26.1
Reinsurer C	A	69,434		8.6		67,723		8.7
Reinsurer D	A++	42,967		5.3		40,592		5.2
Reinsurer E	A+	42,538		5.2		40,528		5.2
Other reinsurers		135,342		16.7		127,808		16.2
Total		$	810,554	100.0	%	$	782,027	100.0	%

Included in the total reinsurance ceded receivables balance were $291.1 million and $243.8 million of claims recoverable, of which $17.6 million and $1.9 million were in excess of 90 days past due, as of March 31, 2018 and December 31, 2017, respectively.

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New Accounting Standards

3 Months Ended

Mar. 31, 2018

Accounting Changes and Error Corrections [Abstract]

New Accounting Standards

New Accounting Standards

Changes to the general accounting principles are established by the Financial Accounting Standards Board (“FASB”) in the form of accounting standards updates to the FASB Accounting Standards Codification™. Accounting standards updates not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on the Company’s condensed consolidated financial statements.

Description	Date of Adoption	Effect on the financial statements or other significant matters
Standards adopted:
Reporting Comprehensive Income This updated guidance requires reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the newly enacted U.S. federal corporate income tax rate. The amount of the reclassification would be the difference between the historical U.S. federal corporate income tax rate and the newly enacted 21 percent tax rate.	December 31, 2017	The Company adopted the new guidance by reclassifying certain income tax effects of items within accumulated other comprehensive income to retained earnings as a result of the Tax Cuts and Jobs Act of 2017. The impact of adopting this standard was an increase in accumulated other comprehensive income and a reduction in retained earnings of approximately $156.4 million.
Stock Compensation This updated guidance requires excess tax benefits and deficiencies from share-based payment awards be recorded in income tax expense in the income statement. Previously, excess tax benefits and deficiencies were recognized in shareholders’ equity or deferred taxes on the balance sheet depending on the tax situation of the Company. In addition, the updated guidance also changes the accounting for forfeitures and statutory tax withholding requirements, as well as the classification in the statement of cash flows.	January 1, 2017	Upon adoption, the Company recognized excess tax benefits of approximately $17.7 million in deferred tax assets that were previously not recognized in a cumulative-effect adjustment increasing retained earnings by $17.7 million. The Company also recorded excess tax benefits of approximately $10.5 million in the provision for income taxes for the year ended December 31, 2017. The number of weighted average diluted shares outstanding were also adjusted to exclude excess tax benefits from the assumed proceeds in the diluted shares calculation resulting in an immaterial increase in the number of dilutive shares outstanding. The Company also elected to continue estimating forfeitures for purposes of recognizing share-based compensation. Other aspects of the adoption of the updated guidance did not have a material impact to the Company’s consolidated financial statements.
Financial Instruments - Recognition and Measurement This guidance requires equity investments that are not accounted for under the equity method of accounting to be measured at fair value with changes recognized in net income and also updates certain presentation and disclosure requirements.	January 1, 2018	This guidance required a cumulative-effect adjustment for certain items upon adoption. The adoption of the new guidance was not material to the Company's consolidated financial statements.

Standards not yet adopted:
Leases This new standard, based on the principle that entities should recognize assets and liabilities arising from leases, does not significantly change the lessees’ recognition, measurement and presentation of expenses and cash flows from the previous accounting standard. Leases are classified as finance or operating. The new standard’s primary change is the requirement for entities to recognize a lease liability for payments and a right of use asset representing the right to use the leased asset during the term of operating lease arrangements. Lessees are permitted to make an accounting policy election to not recognize the asset and liability for leases with a term of twelve months or less. Lessors’ accounting is largely unchanged from the previous accounting standard. In addition, the new standard expands the disclosure requirements of lease arrangements. Early adoption is permitted.	January 1, 2019	This new standard will be adopted by applying a modified retrospective transition approach, which includes a number of practical expedients. The Company is currently evaluating the impact of this amendment on its consolidated financial statements; however, it does not expect the adoption of the new standard to have a material impact on its results of operations or balance sheet as a result of the recognition of right-to-use assets and lease liabilities related to operating leases. Contractual obligations related to operating leases totaled approximately $38.2 million as of December 31, 2017.
Derivatives and Hedging This updated guidance improves the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements and make certain targeted improvements to simplify the application of the hedge accounting in current GAAP related to the assessment of hedge effectiveness. Early adoption is permitted.	January 1, 2019	This new guidance will be adopted by applying a modified retrospective approach to existing hedging relationships as of the date of adoption. The Company is currently evaluating the impact of this updated guidance on its consolidated financial statements.
Financial Instruments - Credit Losses This guidance adds to U.S. GAAP an impairment model, known as current expected credit loss (“CECL”) model that is based on expected losses rather than incurred losses. For traditional and other receivables, held-to-maturity debt securities, loans and other instruments entities will be required to use the new forward-looking “expected loss” model that generally will result in earlier recognition of allowance for losses. For available-for-sale debt securities with unrealized losses, entities will measure credit losses similar to what they do today, except the losses will be recognized as allowances rather than reduction to the amortized cost of the securities. Early adoption is permitted.	January 1, 2020	This guidance will be adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified-retrospective approach). The Company is currently evaluating the impact of this amendment on its consolidated financial statements.

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block]

The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):

	Three months ended March 31,
	2018		2017
Earnings:
Net income (numerator for basic and diluted calculations)	$	100,230	$	145,512
Shares:
Weighted average outstanding shares (denominator for basic calculation)	64,490		64,353
Equivalent shares from outstanding stock options	1,382		1,318
Denominator for diluted calculation	65,872		65,671
Earnings per share:
Basic	$	1.55	$	2.26
Diluted	$	1.52	$	2.22

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Equity (Tables)

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Schedule of Stock by Class [Table Text Block]

The changes in number of common stock shares, issued, held in treasury and outstanding are as follows for the periods indicated:

	Issued	Held In Treasury		Outstanding
Balance, December 31, 2017	79,137,758	14,685,663		64,452,095
Stock-based compensation (1)	—	(60,678	)	60,678
Balance, March 31, 2018	79,137,758	14,624,985		64,512,773

	Issued	Held In Treasury		Outstanding
Balance, December 31, 2016	79,137,758	14,835,256		64,302,502
Stock-based compensation (1)	—	(86,049	)	86,049
Balance, March 31, 2017	79,137,758	14,749,207		64,388,551

(1) Represents net shares issued from treasury pursuant to the Company’s equity-based compensation programs.

Components of Accumulated Other Comprehensive Income

The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the three months ended March 31, 2018 and 2017 are as follows (dollars in thousands):

	Accumulated Other Comprehensive Income (Loss), Net of Income Tax
	Accumulated Currency Translation Adjustments			Unrealized Appreciation (Depreciation) of Investments(1)			Pension and Postretirement Benefits			Total
Balance, December 31, 2017	$	(86,350	)	$	2,200,661		$	(50,680	)	$	2,063,631
Other comprehensive income (loss) before reclassifications	5,696			(827,701		)	(1,910		)	(823,915		)
Amounts reclassified to AOCI	—			21,274			1,346			22,620
Deferred income tax benefit (expense)	(6,856		)	172,823			93			166,060
Balance, March 31, 2018	$	(87,510	)	$	1,567,057		$	(51,151	)	$	1,428,396

	Accumulated Other Comprehensive Income (Loss), Net of Income Tax
	Accumulated Currency Translation Adjustments			Unrealized Appreciation (Depreciation) of Investments(1)			Pension and Postretirement Benefits			Total
Balance, December 31, 2016	$	(172,541	)	$	1,355,033		$	(43,163	)	$	1,139,329
Other comprehensive income (loss) before reclassifications	(50,735		)	283,443			(27		)	232,681
Amounts reclassified to AOCI	—			5,762			1,456			7,218
Deferred income tax benefit (expense)	28,522			(86,090		)	(505		)	(58,073		)
Balance, March 31, 2017	$	(194,754	)	$	1,558,148		$	(42,239	)	$	1,321,155

(1) Includes cash flow hedges of $20,662 and $2,619 as of March 31, 2018 and December 31, 2017, respectively, and $7,690 and $(2,496) as of March 31, 2017 and December 31, 2016, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

Reclassification Out Of Accumulated Other Comprehensive Income

The following table presents the amounts of AOCI reclassifications for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Amount Reclassified from AOCI
	Three months ended March 31,
Details about AOCI Components	2018			2017			Affected Line Item in  Statement of Income
Net unrealized investment gains (losses):
Net unrealized gains (losses) on available-for-sale securities	$	(14,456	)	$	(11,857	)	Investment related gains (losses), net
Cash flow hedges - Interest rate	(370		)	—			(1)
Cash flow hedges - Currency/Interest rate	144			197			(1)
Cash flow hedges - Forward bond purchase commitments	—			50			(1)
Deferred policy acquisition costs attributed to unrealized gains and losses	(6,592		)	5,848			(2)
Total	(21,274		)	(5,762		)
Provision for income taxes	4,678			3,194
Net unrealized gains (losses), net of tax	$	(16,596	)	$	(2,568	)
Amortization of defined benefit plan items:
Prior service cost (credit)	$	246		$	82		(3)
Actuarial gains/(losses)	(1,592		)	(1,538		)	(3)
Total	(1,346		)	(1,456		)
Provision for income taxes	283			510
Amortization of defined benefit plans, net of tax	$	(1,063	)	$	(946	)
Total reclassifications for the period	$	(17,659	)	$	(3,514	)

(1) See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

(2) This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2017 Annual Report for additional details.

(3) This AOCI component is included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional detai

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Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments [Abstract]

Available For Sale Securities

The following table provides information relating to investments in fixed maturity securities by sector as of March 31, 2018 (dollars in thousands):

March 31, 2018:	Amortized		Unrealized		Unrealized		Estimated Fair		% of		Other-than- temporary impairments
	Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
Corporate	$	22,890,985	$	869,867	$	240,383	$	23,520,469	61.9	%	$	—
Canadian government	2,803,077		1,297,817		3,040		4,097,854		10.8		—
RMBS	1,791,007		23,640		27,499		1,787,148		4.7		—
ABS	1,727,810		16,383		9,471		1,734,722		4.6		275
CMBS	1,281,452		12,717		12,236		1,281,933		3.4		—
U.S. government	1,486,262		9,266		59,414		1,436,114		3.8		—
State and political subdivisions	672,064		49,465		8,016		713,513		1.9		—
Other foreign government	3,261,048		133,865		21,406		3,373,507		8.9		—
Total fixed maturity securities	$	35,913,705	$	2,413,020	$	381,465	$	37,945,260	100.0	%	$	275

The following table provides information relating to investments in fixed maturity and equity securities by sector as of December 31, 2017 (dollars in thousands):

December 31, 2017:	Amortized		Unrealized		Unrealized		Estimated Fair		% of		Other-than- temporary impairments
	Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
Corporate	$	21,966,803	$	1,299,594	$	55,429	$	23,210,968	60.9	%	$	—
Canadian government	2,843,273		1,378,510		1,707		4,220,076		11.1		—
RMBS	1,695,126		36,632		11,878		1,719,880		4.5		—
ABS	1,634,758		18,798		5,194		1,648,362		4.3		275
CMBS	1,285,594		22,627		4,834		1,303,387		3.4		—
U.S. government	1,953,436		12,089		21,933		1,943,592		5.1		—
State and political subdivisions	647,727		59,997		4,296		703,428		1.8		—
Other foreign government	3,254,695		154,507		8,075		3,401,127		8.9		—
Total fixed maturity securities	$	35,281,412	$	2,982,754	$	113,346	$	38,150,820	100.0	%	$	275
Non-redeemable preferred stock	$	41,553	$	479	$	2,226	$	39,806	39.7	%
Other equity securities	61,288		479		1,421		60,346		60.3
Total equity securities	$	102,841	$	958	$	3,647	$	100,152	100.0	%

Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

The following table includes fixed maturity securities pledged and received as collateral and assets in trust held to satisfy collateral requirements under derivative transactions and certain third-party reinsurance treaties as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Fixed maturity securities pledged as collateral	$	72,850	$	75,384	$	72,542	$	75,622
Fixed maturity securities received as collateral	n/a		614,423		n/a		590,417
Assets in trust held to satisfy collateral requirements	16,316,662		17,076,547		15,584,296		16,715,281

Concentration Risk Disclosure [Text Block]

The Company’s exposure to concentrations of credit risk from single issuers greater than 10% of the Company’s stockholders’ equity included securities of the U.S. government and its agencies as well as the securities disclosed below as of March 31, 2018 and December 31, 2017 (dollars in thousands).

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Fixed maturity securities guaranteed or issued by:
Canadian province of Quebec	$	1,106,753	$	1,863,568	$	1,119,337	$	1,917,996
Canadian province of Ontario	928,384		1,247,158		939,837		1,282,944

Investments Classified By Contractual Maturity Date

The amortized cost and estimated fair value of fixed maturity securities classified as available-for-sale at March 31, 2018 are shown by contractual maturity in the table below (dollars in thousands). Actual maturities can differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date.

	Amortized Cost		Estimated Fair Value
Available-for-sale:
Due in one year or less	$	900,166	$	905,385
Due after one year through five years	7,939,821		8,084,053
Due after five years through ten years	9,533,025		9,779,934
Due after ten years	12,740,424		14,372,085
Asset and mortgage-backed securities	4,800,269		4,803,803
Total	$	35,913,705	$	37,945,260

Fixed Maturity Holdings Industry Types Weighted Average Credit Ratings [Table Text Block]

The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of March 31, 2018 and December 31, 2017 (dollars in thousands):

March 31, 2018:			Estimated
	Amortized Cost		Fair Value		% of Total
Finance	$	8,250,681	$	8,407,037	35.8	%
Industrial	12,093,034		12,437,180		52.8
Utility	2,547,270		2,676,252		11.4
Total	$	22,890,985	$	23,520,469	100.0	%
December 31, 2017:			Estimated
	Amortized Cost		Fair Value		% of Total
Finance	$	7,977,885	$	8,362,774	36.1	%
Industrial	11,535,166		12,199,333		52.5
Utility	2,453,752		2,648,861		11.4
Total	$	21,966,803	$	23,210,968	100.0	%

Roll Forward Of Cumulative Credit Loss Component Of Otti Income Loss [Table Text Block]

The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts (dollars in thousands):

	Three months ended March 31,
	2018		2017
Balance, beginning of period	$	3,677	$	6,013
Credit loss OTTI previously recognized on securities impaired to fair value during the period	—		(2,336		)
Balance, end of period	$	3,677	$	3,677

Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures

The following table presents the total gross unrealized losses for the 2,114 fixed maturity securities as of March 31, 2018, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

	March 31, 2018
	Gross Unrealized Losses		% of Total
Less than 20%	$	358,873	94.1	%
20% or more for less than six months	20,232		5.3
20% or more for six months or greater	2,360		0.6
Total	$	381,465	100.0	%

The following table presents the total gross unrealized losses for the 1,116 fixed maturity and equity securities at December 31, 2017 where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

	December 31, 2017
	Gross Unrealized Losses		% of Total
Less than 20%	$	113,466	97.0	%
20% or more for less than six months	689		0.6
20% or more for six months or greater	2,838		2.4
Total	$	116,993	100.0	%

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 2,114 fixed maturity securities that have estimated fair values below amortized cost as of March 31, 2018 (dollars in thousands). These investments are presented by class and grade of security, as well as the length of time the related fair value has remained below amortized cost.

	Less than 12 months				12 months or greater				Total
			Gross				Gross				Gross
March 31, 2018:	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
Corporate	$	7,282,079	$	155,541	$	883,699	$	46,908	$	8,165,778	$	202,449
Canadian government	39,192		390		109,552		2,536		148,744		2,926
RMBS	897,255		19,899		225,288		7,575		1,122,543		27,474
ABS	612,053		7,001		114,605		2,423		726,658		9,424
CMBS	538,464		8,026		103,447		4,210		641,911		12,236
U.S. government	488,095		16,856		744,844		42,558		1,232,939		59,414
State and political subdivisions	135,158		3,331		67,949		4,685		203,107		8,016
Other foreign government	746,485		15,575		191,446		5,000		937,931		20,575
Total investment grade securities	10,738,781		226,619		2,440,830		115,895		13,179,611		342,514
Below investment grade securities:
Corporate	452,086		29,597		46,976		8,337		499,062		37,934
Canadian government	1,900		114		—		—		1,900		114
RMBS	—		—		1,272		25		1,272		25
ABS	—		—		1,173		47		1,173		47
Other foreign government	57,385		662		12,045		169		69,430		831
Total below investment grade securities	511,371		30,373		61,466		8,578		572,837		38,951
Total fixed maturity securities	$	11,250,152	$	256,992	$	2,502,296	$	124,473	$	13,752,448	$	381,465

The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 1,116 fixed maturity and equity securities that have estimated fair values below amortized cost as of December 31, 2017 (dollars in thousands):

	Less than 12 months				12 months or greater				Total
			Gross				Gross				Gross
December 31, 2017:	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
Corporate	$	1,886,212	$	17,099	$	1,009,750	$	28,080	$	2,895,962	$	45,179
Canadian government	18,688		91		111,560		1,596		130,248		1,687
RMBS	566,699		5,852		224,439		6,004		791,138		11,856
ABS	434,274		2,707		168,524		2,434		602,798		5,141
CMBS	220,401		1,914		103,269		2,920		323,670		4,834
U.S. government	800,298		6,177		767,197		15,756		1,567,495		21,933
State and political subdivisions	43,510		242		68,666		4,054		112,176		4,296
Other foreign government	369,717		2,707		191,265		4,704		560,982		7,411
Total investment grade securities	4,339,799		36,789		2,644,670		65,548		6,984,469		102,337
Below investment grade securities:
Corporate	194,879		3,317		75,731		6,933		270,610		10,250
Canadian government	1,995		20		—		—		1,995		20
RMBS	—		—		1,369		22		1,369		22
ABS	—		—		1,489		53		1,489		53
Other foreign government	28,600		113		15,134		551		43,734		664
Total below investment grade securities	225,474		3,450		93,723		7,559		319,197		11,009
Total fixed maturity securities	$	4,565,273	$	40,239	$	2,738,393	$	73,107	$	7,303,666	$	113,346
Non-redeemable preferred stock	$	82	$	1	$	26,471	$	2,225	$	26,553	$	2,226
Other equity securities	5,820		1,023		47,251		398		53,071		1,421
Total equity securities	$	5,902	$	1,024	$	73,722	$	2,623	$	79,624	$	3,647

Investment Income

Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):

	Three months ended March 31,
	2018			2017
Fixed maturity securities available-for-sale	$	369,203		$	324,500
Equity securities	1,682			1,359
Mortgage loans on real estate	50,199			44,347
Policy loans	14,780			15,272
Funds withheld at interest	75,445			127,578
Short-term investments and cash and cash equivalents	3,245			1,510
Other	23,828			18,468
Investment income	538,382			533,034
Investment expense	(22,053		)	(18,670		)
Investment income, net of related expenses	$	516,329		$	514,364

Gain Loss On Investments

Investment related gains (losses), net consist of the following (dollars in thousands):

	Three months ended March 31,
	2018			2017
Fixed maturity securities available for sale:
Other-than-temporary impairment losses on fixed maturity securities recognized in earnings	$	—		$	(17,189	)
Gain on investment activity	10,966			17,893
Loss on investment activity	(20,380		)	(8,687		)
Equity securities:
Gain on investment activity	28			—
Loss on investment activity	(950		)	(3,876		)
Change in unrealized gains (losses) recognized in earnings	(4,137		)	—
Other impairment losses and change in mortgage loan provision	(312		)	(99		)
Derivatives and other, net	14,315			72,481
Total investment related gains (losses), net	$	(470	)	$	60,523

Schedule of Repurchase Agreements [Table Text Block]

The following table includes the amount of borrowed securities, securities lent and securities collateral received as part of the securities lending program and repurchased/reverse repurchased securities pledged and received as of March 31, 2018 and December 31, 2017 (dollars in thousands).

	March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Borrowed securities	$	353,875	$	370,760	$	358,875	$	377,820
Securities lending:
Securities loaned	117,449		118,617		117,246		121,551
Securities received	n/a		128,000		n/a		128,000
Repurchase program/reverse repurchase program:
Securities pledged	403,135		411,988		413,819		428,344
Securities received	n/a		404,871		n/a		417,550

Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block]

The following table presents information on the Company’s securities lending and repurchase transactions as of March 31, 2018 and December 31, 2017 (dollars in thousands). Collateral associated with certain borrowed securities is not included within the table, as the collateral pledged to each counterparty is the right to reinsurance treaty cash flows.

	March 31, 2018
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater than 90 Days		Total
Securities lending transactions:
Corporate	$	—	$	—	$	—	$	118,617	$	118,617
Total	$	—	$	—	$	—	$	118,617	$	118,617
Repurchase transactions:
Corporate	$	—	$	—	$	—	$	171,678	$	171,678
RMBS	—		—		—		—		—
U.S. government	—		—		—		219,509		219,509
Foreign government	—		—		—		19,670		19,670
Other	1,131		—		—		—		1,131
Total	1,131		—		—		410,857		411,988
Total borrowings	$	1,131	$	—	$	—	$	529,474	$	530,605
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table									$	563,587
Amounts related to agreements not included in offsetting disclosure									$	32,982

	December 31, 2017
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater than 90 Days		Total
Securities lending transactions:
Corporate	$	—	$	—	$	—	$	121,551	$	121,551
Total	$	—	$	—	$	—	$	121,551	$	121,551
Repurchase transactions:
Corporate	$	—	$	—	$	312	$	184,334	$	184,646
RMBS	—		—		—		—		—
U.S. government	—		—		—		220,765		220,765
Foreign government	—		—		—		21,802		21,802
Other	1,131		—		—		—		1,131
Total	1,131		—		312		426,901		428,344
Total borrowings	$	1,131	$	—	$	312	$	548,452	$	549,895
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table									$	576,786
Amounts related to agreements not included in offsetting disclosure									$	26,891

Disclosure Of Real Estate Holdings By Property Type [Table Text Block]

he distribution of mortgage loans by property type is as follows as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018					December 31, 2017
Property type:	Carrying Value			% of Total		Carrying Value			% of Total
Office building	$	1,518,170		34.1	%	$	1,487,392		33.6	%
Retail	1,236,933			27.8		1,270,676			28.8
Industrial	964,685			21.7		938,612			21.3
Apartment	497,699			11.2		510,052			11.6
Other commercial	232,804			5.2		206,439			4.7
Recorded investment	4,450,291			100.0	%	$	4,413,171		100.0	%
Unamortized balance of loan origination fees and expenses	(3,433		)			(3,254		)
Valuation allowances	(8,864		)			(9,384		)
Total mortgage loans on real estate	$	4,437,994				$	4,400,533

Mortgage Loans Classified By Contractual Maturity Date [Table Text Block]

he maturities of the mortgage loans as of March 31, 2018 and December 31, 2017 are as follows (dollars in thousands):

	March 31, 2018				December 31, 2017
	Recorded Investment		% of Total		Recorded Investment		% of Total
Due within five years	$	1,130,108	25.4	%	$	1,091,066	24.8	%
Due after five years through ten years	2,492,588		56.0		2,516,872		57.0
Due after ten years	827,595		18.6		805,233		18.2
Total	$	4,450,291	100.0	%	$	4,413,171	100.0	%

Mortgage Loan Internal Credit Risk Grade [Table Text Block]

The following tables set forth certain key credit quality indicators of the Company’s recorded investment in mortgage loans as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	Recorded Investment
	Debt Service Ratios						Construction loans
	>1.20x		1.00x - 1.20x		<1.00x				Total		% of Total
March 31, 2018:
Loan-to-Value Ratio
0% - 59.99%	$	2,154,344	$	79,738	$	6,855	$	12,279	$	2,253,216	50.6	%
60% - 69.99%	1,520,008		29,795		68,070		—		1,617,873		36.4
70% - 79.99%	360,183		27,682		30,904		—		418,769		9.4
Greater than 80%	125,660		30,497		4,276		—		160,433		3.6
Total	$	4,160,195	$	167,712	$	110,105	$	12,279	$	4,450,291	100.0	%

	Recorded Investment
	Debt Service Ratios						Construction loans
	>1.20x		1.00x - 1.20x		<1.00x				Total		% of Total
December 31, 2017:
Loan-to-Value Ratio
0% - 59.99%	$	2,148,428	$	53,979	$	3,801	$	—	$	2,206,208	50.0	%
60% - 69.99%	1,517,029		47,128		43,921		—		1,608,078		36.4
70% - 79.99%	396,446		19,461		15,367		—		431,274		9.8
Greater than 80%	120,850		30,713		6,362		9,686		167,611		3.8
Total	$	4,182,753	$	151,281	$	69,451	$	9,686	$	4,413,171	100.0	%

Past Due Financing Receivables [Table Text Block]

The age analysis of the Company’s past due recorded investments in mortgage loans as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018		December 31, 2017
31-60 days past due	$	17,102	$	17,100
61-90 days past due	—		2,056
Greater than 90 days	2,056		—
Total past due	19,158		19,156
Current	4,431,133		4,394,015
Total	$	4,450,291	$	4,413,171

Recorded Investment And Allowance For Credit Losses

he following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018		December 31, 2017
Mortgage loans:
Individually measured for impairment	$	23,423	$	5,858
Collectively measured for impairment	4,426,868		4,407,313
Recorded investment	$	4,450,291	$	4,413,171
Valuation allowances:
Individually measured for impairment	$	—	$	—
Collectively measured for impairment	8,864		9,384
Total valuation allowances	$	8,864	$	9,384

Allowance For Mortgage Loan And Lease Losses Provision For Loss Net

nformation regarding the Company’s loan valuation allowances for mortgage loans for the three months ended March 31, 2018 and 2017 is as follows (dollars in thousands):

	Three months ended March 31,
	2018			2017
Balance, beginning of period	$	9,384		$	7,685
Provision (release)	(516		)	101
Translation adjustment	(4		)	—
Balance, end of period	$	8,864		$	7,786

Impaired Financing Receivables Table

Information regarding the portion of the Company’s mortgage loans that were impaired as of March 31, 2018 and December 31, 2017 is as follows (dollars in thousands):

	Unpaid Principal Balance		Recorded Investment		Related Allowance		Carrying Value
March 31, 2018:
Impaired mortgage loans with no valuation allowance recorded	$	—	$	23,423	$	—	$	23,423
Impaired mortgage loans with valuation allowance recorded	—		—		—		—
Total impaired mortgage loans	$	—	$	23,423	$	—	$	23,423
December 31, 2017:
Impaired mortgage loans with no valuation allowance recorded	$	6,427	$	5,858	$	—	$	5,858
Impaired mortgage loans with valuation allowance recorded	—		—		—		—
Total impaired mortgage loans	$	6,427	$	5,858	$	—	$	5,858
The Company’s average investment balance of impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands):
	Three months ended March 31,
	2018				2017
	Average Recorded Investment(1)		Interest Income		Average Recorded Investment(1)		Interest Income
Impaired mortgage loans with no valuation allowance recorded	$	14,640	$	56	$	2,157	$	33
Impaired mortgage loans with valuation allowance recorded	—		—		—		—
Total impaired mortgage loans	$	14,640	$	56	$	2,157	$	33

(1) Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

Schedule Of Other Invested Assets [Table Text Block]

arrying values of these assets as of March 31, 2018 and December 31, 2017 are as follows (dollars in thousands):

	March 31, 2018		December 31, 2017
Limited partnership interests and real estate joint ventures	805,613		781,124
Equity release mortgages	261,837		219,940
Derivatives	132,195		137,613
FVO contractholder-directed unit-linked investments	221,512		218,541
Other	90,990		148,114
Total other invested assets	$	1,512,147	$	1,505,332

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Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value

The following table presents the notional amounts and gross fair value of derivative instruments prior to taking into account the netting effects of master netting agreements as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018							December 31, 2017
	Notional		Carrying Value/Fair Value					Notional		Carrying Value/Fair Value
	Amount		Assets			Liabilities		Amount		Assets		Liabilities
Derivatives not designated as hedging instruments:
Interest rate swaps	$	1,021,739	$	47,303		$	152	$	996,204	$	59,809	$	2,372
Financial futures	388,874		—			—		412,438		—		—
Foreign currency forwards	6,012		48			4		6,030		—		28
Consumer price index swaps	218,237		127			427		221,932		—		2,160
Credit default swaps	933,200		7,279			1,058		961,200		8,319		1,651
Equity options	639,801		33,958			—		632,251		23,271		—
Longevity swaps	985,920		44,011			—		960,400		40,659		—
Mortality swaps	—		—			1,683		—		—		1,683
Synthetic guaranteed investment contracts	10,866,171		—			—		10,052,576		—		—
Embedded derivatives in:
Modified coinsurance or funds withheld arrangements	—		135,805			—		—		122,194		—
Indexed annuity products	—		—			827,109		—		—		861,758
Variable annuity products	—		—			137,686		—		—		152,470
Total non-hedging derivatives	15,059,954		268,531			968,119		14,243,031		254,252		1,022,122
Derivatives designated as hedging instruments:
Interest rate swaps	435,000		(1,119		)	16,972		435,000		—		20,389
Foreign currency swaps	598,575		56,403			5,461		672,921		65,207		8,496
Foreign currency forwards	698,241		7,458			225		553,175		1,265		7,720
Total hedging derivatives	1,731,816		62,742			22,658		1,661,096		66,472		36,605
Total derivatives	$	16,791,770	$	331,273		$	990,777	$	15,904,127	$	320,724	$	1,058,727

Offsetting Assets [Table Text Block]

The following table provides information relating to the Company’s derivative instruments as of March 31, 2018 and December 31, 2017 (dollars in thousands):

								Gross Amounts Not Offset in the Balance Sheet
	Gross Amounts    Recognized		Gross Amounts Offset in the Balance Sheet			Net Amounts Presented in the Balance Sheet		Financial Instruments (1)			Cash Collateral    Pledged/ Received			Net Amount
March 31, 2018:
Derivative assets	$	195,468	$	(19,262	)	$	176,206	$	—		$	(188,407	)	$	(12,201	)
Derivative liabilities	25,982		(19,262		)	6,720		(57,456		)	(3,470		)	(54,206		)
December 31, 2017:
Derivative assets	$	198,530	$	(20,258	)	$	178,272	$	(862	)	$	(185,900	)	$	(8,490	)
Derivative liabilities	44,499		(20,258		)	24,241		(58,156		)	(22,221		)	(56,136		)

(1) Includes initial margin posted to a central clearing partner.

Offsetting Liabilities [Table Text Block]

The following table provides information relating to the Company’s derivative instruments as of March 31, 2018 and December 31, 2017 (dollars in thousands):

								Gross Amounts Not Offset in the Balance Sheet
	Gross Amounts    Recognized		Gross Amounts Offset in the Balance Sheet			Net Amounts Presented in the Balance Sheet		Financial Instruments (1)			Cash Collateral    Pledged/ Received			Net Amount
March 31, 2018:
Derivative assets	$	195,468	$	(19,262	)	$	176,206	$	—		$	(188,407	)	$	(12,201	)
Derivative liabilities	25,982		(19,262		)	6,720		(57,456		)	(3,470		)	(54,206		)
December 31, 2017:
Derivative assets	$	198,530	$	(20,258	)	$	178,272	$	(862	)	$	(185,900	)	$	(8,490	)
Derivative liabilities	44,499		(20,258		)	24,241		(58,156		)	(22,221		)	(56,136		)

(1) Includes initial margin posted to a central clearing partner.

Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

The gain or loss on the hedged item attributable to a change in foreign currency and the offsetting gain or loss on the related foreign currency swaps as of March 31, 2018 and 2017, were (dollars in thousands):

Type of Fair Value Hedge	Hedged Item	Gains (Losses) Recognized for Derivatives			Gains (Losses) Recognized for Hedged Items			Ineffectiveness Recognized in Investment Related Gains (Losses)
For the three months ended March 31, 2018:
Foreign currency swaps	Foreign-denominated fixed maturity securities	$	(1,891	)	$	1,891		$	—
For the three months ended March 31, 2017:
Foreign currency swaps	Foreign-denominated fixed maturity securities	$	6,536		$	(6,536	)	$	—

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table presents the components of AOCI, before income tax, and the condensed consolidated income statement classification where the gain or loss is recognized related to cash flow hedges for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Three months ended March 31,
	2018			2017
Balance beginning of period	$	2,619		$	(2,496	)
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges	17,817			10,433
Amounts reclassified to investment income	(144		)	(247		)
Amounts reclassified to interest expense	370			—
Balance end of period	$	20,662		$	7,690

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

The following table presents the effective portion of derivatives in cash flow hedging relationships on the condensed consolidated statements of income and the condensed consolidated statements of comprehensive income for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Effective Portion
Derivative Type	Gain (Loss) Deferred in OCI		Gain (Loss) Reclassified into Income from OCI
			Investment Income		Interest Expense
For the three months ended March 31, 2018:
Interest rate	$	14,986	$	—	$	(370	)
Currency/Interest rate	2,831		144		—
Forward bond purchase commitments	—		—		—
Total	$	17,817	$	144	$	(370	)
For the three months ended March 31, 2017:
Interest rate	$	2,216	$	—	$	—
Currency/Interest rate	8,217		197		—
Forward bond purchase commitments	—		50		—
Total	$	10,433	$	247	$	—

Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block]

The following table illustrates the Company’s net investments in foreign operations (“NIFO”) hedges for the three months ended March 31, 2018 and 2017 (dollars in thousands):

	Derivative Gains (Losses) Deferred in AOCI
	For the three months ended March 31,
Type of NIFO Hedge (1) (2)	2018		2017
Foreign currency swaps	$	8,805	$	(7,606	)
Foreign currency forwards	12,236		—

(1) There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.

(2) There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s condensed consolidated statements of income for the three months ended March 31, 2018 and 2017 is as follows (dollars in thousands):

		Gain (Loss) for the three months ended         March 31,
Type of Non-hedging Derivative	Income Statement Location of Gain (Loss)	2018			2017
Interest rate swaps	Investment related gains (losses), net	$	(26,571	)	$	(2,612	)
Financial futures	Investment related gains (losses), net	129			(12,775		)
Foreign currency forwards	Investment related gains (losses), net	323			904
CPI swaps	Investment related gains (losses), net	2,186			(5		)
Credit default swaps	Investment related gains (losses), net	(402		)	7,358
Equity options	Investment related gains (losses), net	2,593			(17,189		)
Longevity swaps	Other revenues	2,267			1,865
Mortality swaps	Other revenues	—			(395		)
Subtotal		(19,475		)	(22,849		)
Embedded derivatives in:
Modified coinsurance or funds withheld arrangements	Investment related gains (losses), net	13,611			68,702
Indexed annuity products	Interest credited	25,351			(16,402		)
Variable annuity products	Investment related gains (losses), net	14,785			22,363
Total non-hedging derivatives		$	34,272		$	51,814

Disclosure Of Credit Derivatives

The following table presents the estimated fair value, maximum amount of future payments and weighted average years to maturity of credit default swaps sold by the Company at March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018						December 31, 2017
Rating Agency Designation of Referenced Credit Obligations(1)	Estimated Fair Value of Credit   Default Swaps			Maximum Amount of Future Payments under Credit Default Swaps(2)		Weighted Average Years to Maturity(3)	Estimated Fair Value of Credit   Default Swaps			Maximum Amount of Future Payments under Credit Default Swaps(2)		Weighted Average Years to Maturity(3)
AAA/AA+/AA/AA-/A+/A/A-
Single name credit default swaps	$	2,761		$	152,000	3.0	$	3,128		$	162,000	2.9
Subtotal	2,761			152,000		3.0	3,128			162,000		2.9
BBB+/BBB/BBB-
Single name credit default swaps	4,203			333,700		2.8	4,469			361,700		2.9
Credit default swaps referencing indices	156			422,600		3.7	(55		)	422,600		4.0
Subtotal	4,359			756,300		3.3	4,414			784,300		3.5
BB+/BB/BB-
Single name credit default swaps	(25		)	15,000		1.5	30			5,000		1.5
Subtotal	(25		)	15,000		1.5	30			5,000		1.5
Total	$	7,095		$	923,300	3.2	$	7,572		$	951,300	3.4

(1) The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).

(2) Assumes the value of the referenced credit obligations is zero.

(3) The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

Changes In Estimated Fair Value Related To Embedded Derivatives

The related gains (losses) and the effect on net income after amortization of deferred acquisition costs (“DAC”) and income taxes for the three months ended March 31, 2018 and 2017 are reflected in the following table (dollars in thousands):

	Three months ended March 31,
	2018		2017
Embedded derivatives in modco or funds withheld arrangements included in investment related gains	$	13,611	$	68,702
After the associated amortization of DAC and taxes, the related amounts included in net income	6,850		25,844
Embedded derivatives in variable annuity contracts included in investment related gains	14,785		22,363
After the associated amortization of DAC and taxes, the related amounts included in net income	11,126		28,836
Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses	25,351		(16,402		)
After the associated amortization of DAC and taxes, the related amounts included in net income	6,537		(21,396		)

Credit Risk

Information regarding the Company’s credit exposure related to its over-the-counter derivative contracts, centrally cleared derivative contracts and margin account for exchange-traded futures at March 31, 2018 and December 31, 2017 are reflected in the following table (dollars in thousands):

	March 31, 2018			December 31, 2017
Estimated fair value of derivatives in net asset position	$	171,169		$	155,714
Cash provided as collateral(1)	3,470			22,221
Securities pledged to counterparties as collateral(2)	57,456			58,156
Cash pledged from counterparties as collateral(3)	(188,407		)	(185,900		)
Securities pledged from counterparties as collateral(4)	—			(862		)
Initial margin for cleared derivatives(2)	(57,456		)	(58,156		)
Net amount after application of master netting agreements and collateral	$	(13,768	)	$	(8,827	)
Margin account related to exchange-traded futures(5)	$	7,382		$	6,538

(1) Consists of receivable from counterparty, included in other assets.

(2) Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.

(3) Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.

(4) Consists of U.S. Treasury and government securities.

(5) Included in other assets.

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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule Of Fair Value Assets and Liabilities Measured on Recurring Basis Table Text Block

Assets and liabilities measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 are summarized below (dollars in thousands):

March 31, 2018:				Fair Value Measurements Using:
	Total			Level 1		Level 2			Level 3
Assets:
Fixed maturity securities – available-for-sale:
Corporate	$	23,520,469		$	—	$	22,221,205		$	1,299,264
Canadian government	4,097,854			—		3,525,107			572,747
RMBS	1,787,148			—		1,666,534			120,614
ABS	1,734,722			—		1,604,016			130,706
CMBS	1,281,933			—		1,280,049			1,884
U.S. government	1,436,114			1,313,806		101,255			21,053
State and political subdivisions	713,513			—		671,637			41,876
Other foreign government	3,373,507			—		3,368,503			5,004
Total fixed maturity securities – available-for-sale	37,945,260			1,313,806		34,438,306			2,193,148
Equity securities	103,983			67,831		—			36,152
Funds withheld at interest – embedded derivatives	135,805			—		—			135,805
Cash equivalents	538,761			538,761		—			—
Short-term investments	58,499			67		55,215			3,217
Other invested assets:
Derivatives:
Interest rate swaps	40,812			—		40,812			—
Foreign currency forwards	6,932			—		6,932			—
CPI swaps	(99		)	—		(99		)	—
Credit default swaps	5,465			—		5,465			—
Equity options	27,140			—		27,140			—
Foreign currency swaps	51,945			—		51,945			—
FVO contractholder-directed unit-linked investments	221,512			221,043		469			—
Total other invested assets	353,707			221,043		132,664			—
Other assets - longevity swaps	44,011			—		—			44,011
Total	$	39,180,026		$	2,141,508	$	34,626,185		$	2,412,333
Liabilities:
Interest sensitive contract liabilities – embedded derivatives	$	964,795		$	—	$	—		$	964,795
Other liabilities:
Derivatives:
Interest rate swaps	11,752			—		11,752			—
Foreign currency forwards	(345		)	—		(345		)	—
CPI swaps	201			—		201			—
Credit default swaps	(756		)	—		(756		)	—
Equity options	(6,818		)	—		(6,818		)	—
Foreign currency swaps	1,003			—		1,003			—
Mortality swaps	1,683			—		—			1,683
Total	$	971,515		$	—	$	5,037		$	966,478

December 31, 2017:				Fair Value Measurements Using:
	Total			Level 1		Level 2			Level 3
Assets:
Fixed maturity securities – available-for-sale:
Corporate	$	23,210,968		$	—	$	21,873,696		$	1,337,272
Canadian government	4,220,076			—		3,626,134			593,942
RMBS	1,719,880			—		1,611,998			107,882
ABS	1,648,362			—		1,524,888			123,474
CMBS	1,303,387			—		1,300,153			3,234
U.S. government	1,943,592			1,818,006		103,075			22,511
State and political subdivisions	703,428			—		662,225			41,203
Other foreign government	3,401,127			—		3,396,035			5,092
Total fixed maturity securities – available-for-sale	38,150,820			1,818,006		34,098,204			2,234,610
Equity securities:
Non-redeemable preferred stock	39,806			39,806		—			—
Other equity securities	60,346			60,346		—			—
Funds withheld at interest – embedded derivatives	122,194			—		—			122,194
Cash equivalents	356,788			354,071		2,717			—
Short-term investments	50,746			—		47,650			3,096
Other invested assets:
Derivatives:
Interest rate swaps	51,359			—		51,359			—
Foreign currency forwards	730			—		730			—
CPI swaps	(221		)	—		(221		)	—
Credit default swaps	5,908			—		5,908			—
Equity options	16,932			—		16,932			—
Foreign currency swaps	62,905			—		62,905			—
FVO contractholder-directed unit-linked investments	218,541			217,618		923			—
Total other invested assets	356,154			217,618		138,536			—
Other assets - longevity swaps	40,659			—		—			40,659
Total	$	39,177,513		$	2,489,847	$	34,287,107		$	2,400,559
Liabilities:
Interest sensitive contract liabilities – embedded derivatives	$	1,014,228		$	—	$	—		$	1,014,228
Other liabilities:
Derivatives:
Interest rate swaps	14,311			—		14,311			—
Foreign currency forwards	7,213			—		7,213			—
CPI swaps	1,939			—		1,939			—
Credit default swaps	(760		)	—		(760		)	—
Equity options	(6,339		)	—		(6,339		)	—
Foreign currency swaps	6,194			—		6,194			—
Mortality swaps	1,683			—		—			1,683
Total	$	1,038,469		$	—	$	22,558		$	1,015,911

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Level Transfers [Table Text Block]

The following tables present the transfers between Level 1 and Level 2 during the three months ended March 31, 2017 (dollars in thousands):

	2017
	Transfers from     Level 1 to Level 2		Transfers from     Level 2 to Level 1
Fixed maturity securities - available-for-sale:
Corporate	$	—	$	38,675

Fair Value Unobservable Input Measurements [Table Text Block]

The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements that are developed internally by the Company as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	Estimated Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
	March 31, 2018	December 31, 2017			March 31, 2018		December 31, 2017
Assets:
Corporate	$183,680	$173,579	Market comparable securities	Liquidity premium	0-2% (1%)		0-2%  (1%)
				EBITDA Multiple	5.9X - 7.5X (6.6X)		—
U.S. government	21,053	22,511	Market comparable securities	Liquidity premium	0-1% (1%)		0-1%  (1%)
State and political subdivisions	4,452	4,616	Market comparable securities	Liquidity premium	1	%	1	%
Equity securities	25,987	—	Market comparable securities	Liquidity premium	3%		—
				EBITDA Multiple	6.9X - 13.1X (8.0X)		—
Funds withheld at interest- embedded derivatives	135,805	122,194	Total return swap	Mortality	0-100%  (2%)		0-100%  (2%)
				Lapse	0-35%  (9%)		0-35%  (9%)
				Withdrawal	0-5%  (3%)		0-5%  (3%)
				CVA	0-5%  (1%)		0-5%  (1%)
				Crediting rate	2-4%  (2%)		2-4%  (2%)
Longevity swaps	44,011	40,659	Discounted cash flow	Mortality	0-100%  (2%)		0-100%  (2%)
				Mortality improvement	(10%)-10%   (3%)		(10%)-10%   (3%)
Liabilities:
Interest sensitive contract liabilities- embedded derivatives- indexed annuities	827,109	861,758	Discounted cash flow	Mortality	0-100%  (2%)		0-100% (2%)
				Lapse	0-35%  (9%)		0-35% (9%)
				Withdrawal	0-5%  (3%)		0-5% (3%)
				Option budget projection	2-4%  (2%)		2-4% (2%)
Interest sensitive contract liabilities- embedded derivatives- variable annuities	137,686	152,470	Discounted cash  flow	Mortality	0-100% (1%)		0-100% (1%)
				Lapse	0-25% (5%)		0-25% (5%)
				Withdrawal	0-7% (4%)		0-7% (3%)
				CVA	0-5% (1%)		0-5% (1%)
				Long-term volatility	0-27% (13%)		0-27% (8%)
Mortality swaps	1,683	1,683	Discounted cash flow	Mortality	0-100%  (1%)		0-100%  (1%)

Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block]

The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements that are developed internally by the Company as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	Estimated Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
	March 31, 2018	December 31, 2017			March 31, 2018		December 31, 2017
Assets:
Corporate	$183,680	$173,579	Market comparable securities	Liquidity premium	0-2% (1%)		0-2%  (1%)
				EBITDA Multiple	5.9X - 7.5X (6.6X)		—
U.S. government	21,053	22,511	Market comparable securities	Liquidity premium	0-1% (1%)		0-1%  (1%)
State and political subdivisions	4,452	4,616	Market comparable securities	Liquidity premium	1	%	1	%
Equity securities	25,987	—	Market comparable securities	Liquidity premium	3%		—
				EBITDA Multiple	6.9X - 13.1X (8.0X)		—
Funds withheld at interest- embedded derivatives	135,805	122,194	Total return swap	Mortality	0-100%  (2%)		0-100%  (2%)
				Lapse	0-35%  (9%)		0-35%  (9%)
				Withdrawal	0-5%  (3%)		0-5%  (3%)
				CVA	0-5%  (1%)		0-5%  (1%)
				Crediting rate	2-4%  (2%)		2-4%  (2%)
Longevity swaps	44,011	40,659	Discounted cash flow	Mortality	0-100%  (2%)		0-100%  (2%)
				Mortality improvement	(10%)-10%   (3%)		(10%)-10%   (3%)
Liabilities:
Interest sensitive contract liabilities- embedded derivatives- indexed annuities	827,109	861,758	Discounted cash flow	Mortality	0-100%  (2%)		0-100% (2%)
				Lapse	0-35%  (9%)		0-35% (9%)
				Withdrawal	0-5%  (3%)		0-5% (3%)
				Option budget projection	2-4%  (2%)		2-4% (2%)
Interest sensitive contract liabilities- embedded derivatives- variable annuities	137,686	152,470	Discounted cash  flow	Mortality	0-100% (1%)		0-100% (1%)
				Lapse	0-25% (5%)		0-25% (5%)
				Withdrawal	0-7% (4%)		0-7% (3%)
				CVA	0-5% (1%)		0-5% (1%)
				Long-term volatility	0-27% (13%)		0-27% (8%)
Mortality swaps	1,683	1,683	Discounted cash flow	Mortality	0-100%  (1%)		0-100%  (1%)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

For the three months ended March 31, 2018:	Fixed maturity securities - available-for-sale
	Corporate			Canadian government			RMBS			ABS
Fair value, beginning of period	$	1,337,272		$	593,942		$	107,882		$	123,474
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	(361		)	3,444			(92		)	106
Investment related gains (losses), net	—			—			—			2
Included in other comprehensive income	(32,852		)	(24,639		)	(1,110		)	853
Purchases(1)	100,170			—			20,916			11,000
Sales(1)	(6,180		)	—			—			—
Settlements(1)	(75,146		)	—			(2,963		)	(2,739		)
Transfers into Level 3	7,166			—			—			—
Transfers out of Level 3	(30,805		)	—			(4,019		)	(1,990		)
Fair value, end of period	$	1,299,264		$	572,747		$	120,614		$	130,706
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	(361	)	$	3,444		$	(92	)	$	106

For the three months ended March 31, 2018 (continued):	Fixed maturity securities - available-for-sale
	CMBS			U.S. government			State and political subdivisions			Other foreign government
Fair value, beginning of period	$	3,234		$	22,511		$	41,203		$	5,092
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	—			(110		)	8			—
Included in other comprehensive income	(47		)	(340		)	700			(88		)
Purchases(1)	—			96			—			—
Settlements(1)	(1		)	(1,104		)	(35		)	—
Transfers out of Level 3	(1,302		)	—			—			—
Fair value, end of period	$	1,884		$	21,053		$	41,876		$	5,004
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	—		$	(110	)	$	8		$	—

For the three months ended March 31, 2018 (continued):	Equity securities			Funds withheld at interest- embedded derivatives		Short-term Investments			Other assets - longevity swaps		Interest sensitive contract liabilities embedded derivatives			Other liabilities - mortality swaps
Fair value, beginning of period	$	—		$	122,194	$	3,096		$	40,659	$	(1,014,229	)	$	(1,683	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment related gains (losses), net	(2,677		)	13,611		—			—		14,785			—
Interest credited	—			—		—			—		25,351			—
Included in other comprehensive income	—			—		(25		)	1,085		—			—
Other revenues	—			—		—			2,267		—			—
Purchases(1)	—			—		146			—		(8,508		)	—
Sales(1)	(28		)	—		—			—		—			—
Settlements(1)	(48		)	—		—			—		17,807			—
Transfers into Level 3	38,905			—		—			—		—			—
Fair value, end of period	$	36,152		$	135,805	$	3,217		$	44,011	$	(964,794	)	$	(1,683	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	—		$	—	$	—		$	—	$	—		$	—
Investment related gains (losses), net	(2,705		)	13,611		—			—		12,901			—
Other revenues	—			—		—			2,267		—			—
Interest credited	—			—		—			—		7,544			—

For the three months ended March 31, 2017:	Fixed maturity securities - available-for-sale
	Corporate			Canadian governments		RMBS			ABS			CMBS			U.S. government
Fair value, beginning of period	$	1,272,253		$	475,965	$	160,291		$	219,280		$	21,145		$	24,488
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	(423		)	3,070		(245		)	1,018			709			(117		)
Investment related gains (losses), net	(1,231		)	—		365			—			(595		)	—
Included in other comprehensive income	4,948			4,525		650			5,767			(83		)	52
Purchases(1)	45,914			—		16,499			10,849			—			104
Sales(1)	—			—		(10,604		)	—			(3,720		)	—
Settlements(1)	(71,470		)	—		(6,784		)	(18,154		)	(5,401		)	(1,053		)
Transfers into Level 3	13,934			—		77			35,258			—			—
Transfers out of Level 3	—			—		(16,819		)	(45,582		)	(10,132		)	—
Fair value, end of period	$	1,263,925		$	483,560	$	143,430		$	208,436		$	1,923		$	23,474
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	(423	)	$	3,070	$	(91	)	$	161		$	—		$	(117	)
Investment related gains (losses), net	(1,293		)	—		(346		)	—			—			—

For the three months ended March 31, 2017 (continued):	Fixed maturity securities available-for-sale
	State and political subdivisions			Other foreign government			Funds withheld at interest- embedded derivatives			Short-term Investments			Other assets - longevity swaps		Interest sensitive contract liabilities embedded derivatives			Other liabilities - mortality swaps
Fair value, beginning of period	$	41,666		$	12,869		$	(22,529	)	$	3,346		$	26,958	$	(990,308	)	$	(2,462	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses	(88		)	—			—			—			—		—			—
Investment related gains (losses), net	—			—			68,702			—			—		22,362			—
Interest credited	—			—			—			—			—		(16,402		)	—
Included in other comprehensive income	(843		)	(191		)	—			33			347		—			—
Other revenues	—			—			—			—			1,865		—			(395		)
Purchases(1)	—			—			—			32			—		(6,393		)	—
Settlements(1)	(33		)	(334		)	—			(135		)	—		17,811			—
Transfers out of Level 3	(6,844		)	—			—			—			—		—			—
Fair value, end of period	$	33,858		$	12,344		$	46,173		$	3,276		$	29,170	$	(972,930	)	$	(2,857	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses	$	(88	)	$	—		$	—		$	—		$	—	$	—		$	—
Investment related gains (losses), net	—			—			68,702			—			—		20,300			—
Other revenues	—			—			—			—			1,865		—			(395		)
Interest credited	—			—			—			—			—		(34,214		)	—

(1) The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

Financial Instruments Carrying Amounts And Estimated Fair Value [Table Text Block]

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments, which were not measured at fair value on a recurring basis, as of March 31, 2018 and December 31, 2017 (dollars in thousands). For additional information regarding the methods and significant assumptions used by the Company to estimate these fair values, see Note 6 in the Notes to Consolidated Financial Statements included in the Company’s 2017 Annual Report. This table excludes any payables or receivables for collateral under repurchase agreements and other transactions. The estimated fair value of the excluded amount approximates carrying value as they equal the amount of cash collateral received/paid.

March 31, 2018:	Carrying Value (1)		Estimated  Fair Value		Fair Value Measurement Using:
					Level 1		Level 2		Level 3		NAV
Assets:
Mortgage loans on real estate	$	4,437,994	$	4,411,472	$	—	$	—	$	4,411,472	$	—
Policy loans	1,346,930		1,346,930		—		1,346,930		—		—
Funds withheld at interest	5,865,791		6,098,479		—		—		6,098,479		—
Cash and cash equivalents	971,646		971,646		971,646		—		—		—
Short-term investments	71,931		71,931		71,931		—		—		—
Other invested assets	690,200		710,009		10,165		68,903		283,205		347,736
Accrued investment income	408,338		408,338		—		408,338		—		—
Liabilities:
Interest-sensitive contract liabilities	$	13,169,951	$	13,151,162	$	—	$	—	$	13,151,162	$	—
Long-term debt	2,788,240		2,916,200		—		—		2,916,200		—
Collateral finance and securitization notes	753,393		692,696		—		—		692,696		—
December 31, 2017:
Assets:
Mortgage loans on real estate	$	4,400,533	$	4,477,654	$	—	$	—	$	4,477,654	$	—
Policy loans	1,357,624		1,357,624		—		1,357,624		—		—
Funds withheld at interest	5,955,092		6,275,623		—		—		6,275,623		—
Cash and cash equivalents	946,736		946,736		946,736		—		—		—
Short-term investments	42,558		42,558		42,558		—		—		—
Other invested assets	651,792		679,377		28,540		67,778		247,934		335,125
Accrued investment income	392,721		392,721		—		392,721		—		—
Liabilities:
Interest-sensitive contract liabilities	$	12,683,872	$	12,917,243	$	—	$	—	$	12,917,243	$	—
Long-term debt	2,788,365		2,959,912		—		—		2,959,912		—
Collateral finance and securitization notes	783,938		722,145		—		—		722,145		—

(1)

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Reconciliation Of Revenue From Segments To Consolidated Text Block

Information related to revenues, income (loss) before income taxes and total assets of the Company for each reportable segment are summarized below (dollars in thousands):

	Three months ended March 31,
Revenues:	2018		2017
U.S. and Latin America:
Traditional	$	1,489,694	$	1,488,503
Financial Solutions	213,352		298,846
Total	1,703,046		1,787,349
Canada:
Traditional	302,319		264,275
Financial Solutions	12,777		11,807
Total	315,096		276,082
Europe, Middle East and Africa:
Traditional	393,782		318,086
Financial Solutions	88,143		79,989
Total	481,925		398,075
Asia Pacific:
Traditional	614,539		505,230
Financial Solutions	19,846		20,452
Total	634,385		525,682
Corporate and Other	39,255		21,552
Total	$	3,173,707	$	3,008,740

Reconciliation Of Operating Profit Loss From Segments To Consolidated Text Block

	Three months ended March 31,
Income (loss) before income taxes:	2018			2017
U.S. and Latin America:
Traditional	$	2,892		$	29,960
Financial Solutions	67,421			103,586
Total	70,313			133,546
Canada:
Traditional	23,707			19,328
Financial Solutions	3,191			3,592
Total	26,898			22,920
Europe, Middle East and Africa:
Traditional	15,421			13,976
Financial Solutions	39,164			31,918
Total	54,585			45,894
Asia Pacific:
Traditional	22,887			41,688
Financial Solutions	4,021			5,872
Total	26,908			47,560
Corporate and Other	(40,779		)	(42,076		)
Total	$	137,925		$	207,844

Reconciliation Of Assets From Segment To Consolidated Text Block

Assets:	March 31, 2018		December 31, 2017
U.S. and Latin America:
Traditional	$	18,839,888	$	18,603,423
Financial Solutions	16,349,148		15,959,206
Total	35,189,036		34,562,629
Canada:
Traditional	4,234,253		4,161,452
Financial Solutions	126,747		126,372
Total	4,361,000		4,287,824
Europe, Middle East and Africa:
Traditional	3,385,127		3,099,495
Financial Solutions	5,279,499		5,274,993
Total	8,664,626		8,374,488
Asia Pacific:
Traditional	5,095,054		4,915,442
Financial Solutions	1,175,002		1,198,585
Total	6,270,056		6,114,027
Corporate and Other	6,470,105		7,175,850
Total	$	60,954,823	$	60,514,818

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Commitments, Contingencies and Guarantees (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]

The Company’s commitments to fund investments as of March 31, 2018 and December 31, 2017 are presented in the following table (dollars in thousands):

	March 31, 2018		December 31, 2017
Limited partnership interests and joint ventures	$	482,149	$	485,197
Commercial mortgage loans	67,837		40,815
Bank loans and private placements	96,808		60,472
Equity release mortgages	132,523		153,937

Other Commitments [Table Text Block]

The following table presents the maximum potential obligation for these commitments as of March 31, 2018 (dollars in millions):

Commitment Period	Maximum Potential Obligation
2023	$	500.0
2033	450.0
2034	2,000.0
2035	1,314.2
2036	1,932.0
2037	6,750.0
2038	800.0

Schedule of Guarantor Obligations [Table Text Block]

RGA’s guarantees issued as of March 31, 2018 and December 31, 2017 are reflected in the following table (dollars in thousands):

	March 31, 2018		December 31, 2017
Treaty guarantees	$	949,443	$	1,047,449
Treaty guarantees, net of assets in trust	832,487		926,393
Securities borrowing and repurchase arrangements	291,325		294,325
Financing arrangements	77,858		86,183
Lease obligations	1,465		1,662

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Income Tax (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

for the three months ended March 31, 2018 and 2017, respectively (dollars in thousands):

	Three months ended March 31,
	2018			2017
Tax provision at U.S. statutory rate	$	28,964		$	72,745
Increase (decrease) in income taxes resulting from:
U.S. Tax Reform provisional adjustments	775			—
Foreign tax rate differing from U.S. tax rate	1,432			(6,153		)
Differences in tax bases in foreign jurisdictions	(5,760		)	(3,383		)
Deferred tax valuation allowance	7,947			1,182
Amounts related to tax audit contingencies	835			611
Corporate rate changes	111			(1,237		)
Subpart F	658			186
Foreign tax credits	(572		)	(126		)
Global intangible low-taxed income, net of credit	4,409			—
Return to provision adjustments	—			229
Equity compensation excess benefit	(1,114		)	(1,856		)
Other, net	10			134
Total provision for income taxes	$	37,695		$	62,332
Effective tax rate	27.3		%	30.0		%

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Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule Of Defined Benefit Plans Disclosures Text Block

The components of net periodic benefit cost, included in other operating expenses on the condensed consolidated statements of income, for the three months ended March 31, 2018 and 2017 were as follows (dollars in thousands):

	Pension Benefits						Other Benefits
	Three months ended March 31,						Three months ended March 31,
	2018			2017			2018			2017
Service cost	$	2,654		$	2,580		$	636		$	721
Interest cost	1,330			1,198			530			565
Expected return on plan assets	(1,554		)	(1,285		)	—			—
Amortization of prior service cost (credit)	83			74			(329		)	(156		)
Amortization of prior actuarial losses	1,094			1,081			498			457
Settlements	—			257			—			—
Net periodic benefit cost	$	3,607		$	3,905		$	1,335		$	1,587

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Reinsurance (Tables)

3 Months Ended

Mar. 31, 2018

Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract]

Ceded Credit Risk [Table Text Block]

The following table presents information for the Company’s reinsurance ceded receivable assets, including the respective amount and A.M. Best rating for each reinsurer representing in excess of five percent of the total as of March 31, 2018 and December 31, 2017 (dollars in thousands):

		March 31, 2018				December 31, 2017
Reinsurer	A.M. Best Rating	Amount		% of Total		Amount		% of Total
Reinsurer A	A+	$	317,136	39.1	%	$	301,478	38.6	%
Reinsurer B	A+	203,137		25.1		203,898		26.1
Reinsurer C	A	69,434		8.6		67,723		8.7
Reinsurer D	A++	42,967		5.3		40,592		5.2
Reinsurer E	A+	42,538		5.2		40,528		5.2
Other reinsurers		135,342		16.7		127,808		16.2
Total		$	810,554	100.0	%	$	782,027	100.0	%

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Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income (numerator for basic and diluted calculations)	$ 100,230	$ 145,512
Shares:
Weighted average outstanding shares (denominator for basic calculation)	64,490	64,353
Equivalent shares from outstanding stock options	1,382	1,318
Denominator for diluted calculation	65,872	65,671
Earnings Per Share:
Basic earnings per share	$ 1.55	$ 2.26
Diluted earnings per share	$ 1.52	$ 2.22

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Earnings Per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	0.2	0.2
Contingently Issuable Shares [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	0.2	0.5

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Equity (Common Stock Changes In Number of Shares Issued, Held In Treasury and Outstanding) (Details) - shares		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Common Stock, Shares, Issued		79,137,758		79,137,758
Common Stock Issuable [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		79,137,758	79,137,758	79,137,758	79,137,758
Stock Based Compensation Shares	[1]	0	0
Common Stock Held In Treasury [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		14,624,985	14,749,207	14,685,663	14,835,256
Stock Based Compensation Shares	[1]	(60,678)	(86,049)
Common Stock Outstanding [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		64,512,773	64,388,551	64,452,095	64,302,502
Stock Based Compensation Shares	[1]	60,678	86,049

[1] Represents net shares issued from treasury pursuant to the Company’s equity-based compensation programs.

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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Balance, Beginning of Period		$ 2,063,631	$ 1,139,329
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(823,915)	232,681
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		22,620	7,218
Other Comprehensive Income (Loss), Tax		(166,060)	58,073
Balance, End of Period		1,428,396	1,321,155
Accumulated Translation Adjustment [Member]
Balance, Beginning of Period		(86,350)	(172,541)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		5,696	(50,735)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		(6,856)	28,522
Balance, End of Period		(87,510)	(194,754)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Balance, Beginning of Period	[1]	2,200,661	1,355,033
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[1]	(827,701)	283,443
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	21,274	5,762
Other Comprehensive Income (Loss), Tax	[1]	(172,823)	86,090
Balance, End of Period	[1]	1,567,057	1,558,148
Accumulated Defined Benefit Plans Adjustment [Member]
Balance, Beginning of Period		(50,680)	(43,163)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(1,910)	(27)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		1,346	1,456
Other Comprehensive Income (Loss), Tax		(93)	505
Balance, End of Period		$ (51,151)	$ (42,239)

[1] Includes cash flow hedges of $20,662 and $2,619 as of March 31, 2018 and December 31, 2017, respectively, and $7,690 and $(2,496) as of March 31, 2017 and December 31, 2016, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

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Equity (Balance of and Changes in Each Component of AOCI) (Footnote) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 20,662	$ 7,690	$ 2,619	$ (2,496)

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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Investment related gains (losses), net	$ (470)	$ 77,712
Investment income	516,329	514,364
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	137,925	207,844
Income Tax Expense (Benefit)	(37,695)	(62,332)
Net income	100,230	145,512
Unrealized Appreciation Depreciation Of Investments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Investment related gains (losses), net	(14,456)	(11,857)
Deferred policy acquisition costs attributed to unrealized gains and losses	(6,592)	5,848
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(21,274)	(5,762)
Income Tax Expense (Benefit)	4,678	3,194
Net income	(16,596)	(2,568)
Amortization Of Unrealized Pension And Postretirement Benefits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Prior service cost	246	82
Actuarial gains/(losses)	(1,592)	(1,538)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(1,346)	(1,456)
Income Tax Expense (Benefit)	283	510
Net income	(1,063)	(946)
Amounts Reclassified From AOCI [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net income	(17,659)	(3,514)
Interest Rate Options [Member] | Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(370)	0
Currency Swap [Member] | Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	144	197
Forward Contracts [Member] | Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 0	$ 50

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Equity (Narrative) (Details) $ in Millions	Mar. 31, 2018 USD ($)
Equity [Abstract]
Stock Repurchase Program, Authorized Amount	$ 400.0

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Equity Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity compensation expense	$ 9.7	$ 9.6
Stock appreciation rights granted	200,000
Stock appreciation rights granted, weighted average exercise price (per share)	$ 150.87
Performance contingent units	100,000
Shares Granted To Non Employee Directors	7,263
Options exercisable (shares)	1,700,000
Options exercisable, weighted average price (per share)	$ 68.51
Options, remaining term	4 years 11 months

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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 22,890,985	$ 21,966,803
Estimated Fair Value	$ 23,520,469	$ 23,210,968
% of Total	100.00%	100.00%
Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 35,913,705	$ 35,281,412
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,413,020	2,982,754
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	381,465	113,346
Estimated Fair Value	$ 37,945,260	$ 38,150,820
% of Total	100.00%	100.00%
Other-than-temporary impairments in AOCI	$ 275	$ 275
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		102,841
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		958
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		3,647
Estimated Fair Value		$ 100,152
% of Total		100.00%
Corporate Debt Securities [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,890,985	$ 21,966,803
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	869,867	1,299,594
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	240,383	55,429
Estimated Fair Value	$ 23,520,469	$ 23,210,968
% of Total	61.90%	60.90%
Other-than-temporary impairments in AOCI	$ 0	$ 0
Canadian and Canadian provincial governments | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,803,077	2,843,273
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,297,817	1,378,510
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	3,040	1,707
Estimated Fair Value	$ 4,097,854	$ 4,220,076
% of Total	10.80%	11.10%
Other-than-temporary impairments in AOCI	$ 0	$ 0
Residential mortgage-backed securities | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,791,007	1,695,126
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	23,640	36,632
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	27,499	11,878
Estimated Fair Value	$ 1,787,148	$ 1,719,880
% of Total	4.70%	4.50%
Other-than-temporary impairments in AOCI	$ 0	$ 0
Asset-backed securities | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,727,810	1,634,758
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	16,383	18,798
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	9,471	5,194
Estimated Fair Value	$ 1,734,722	$ 1,648,362
% of Total	4.60%	4.30%
Other-than-temporary impairments in AOCI	$ 275	$ 275
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,281,452	1,285,594
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	12,717	22,627
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	12,236	4,834
Estimated Fair Value	$ 1,281,933	$ 1,303,387
% of Total	3.40%	3.40%
Other-than-temporary impairments in AOCI	$ 0	$ 0
US Treasury and Government [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,486,262	1,953,436
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	9,266	12,089
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	59,414	21,933
Estimated Fair Value	$ 1,436,114	$ 1,943,592
% of Total	3.80%	5.10%
Other-than-temporary impairments in AOCI	$ 0	$ 0
US States and Political Subdivisions Debt Securities [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	672,064	647,727
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	49,465	59,997
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	8,016	4,296
Estimated Fair Value	$ 713,513	$ 703,428
% of Total	1.90%	1.80%
Other-than-temporary impairments in AOCI	$ 0	$ 0
Foreign Government Debt Securities [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,261,048	3,254,695
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	133,865	154,507
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	21,406	8,075
Estimated Fair Value	$ 3,373,507	$ 3,401,127
% of Total	8.90%	8.90%
Other-than-temporary impairments in AOCI	$ 0	$ 0
Nonredeemable Preferred Stock [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		41,553
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		479
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		2,226
Estimated Fair Value		$ 39,806
% of Total		39.70%
Equity Securities Other Than Non-redeemable Preferred Stock [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 61,288
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		479
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		1,421
Estimated Fair Value		$ 60,346
% of Total		60.30%

XML

Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 22,890,985	$ 21,966,803
Available-for-sale Securities	23,520,469	23,210,968
Collateral Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	72,850	72,542
Available-for-sale Securities	75,384	75,622
Collateral Received Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	614,423	590,417
Reported Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Assets Held-in-trust	16,316,662	15,584,296
Estimate of Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Assets Held-in-trust	$ 17,076,547	$ 16,715,281

XML

Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 22,890,985	$ 21,966,803
Available-for-sale Securities	23,520,469	23,210,968
Canadian Province Of Quebec Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,106,753	939,837
Available-for-sale Securities	1,863,568	1,282,944
Canadian Province Of Ontario Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	928,384	1,119,337
Available-for-sale Securities	$ 1,247,158	$ 1,917,996

XML

Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 900,166
Due after one year through five years	7,939,821
Due after five year through ten years	9,533,025
Due after ten years	12,740,424
Asset and mortgage-backed securities	4,800,269
Total	35,913,705	$ 35,281,412
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	905,385
Due after one year through five years	8,084,053
Due after five year through ten years	9,779,934
Due after ten years	14,372,085
Asset and mortgage-backed securities	4,803,803
Total	$ 37,945,260	$ 38,150,820

XML

Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 22,890,985	$ 21,966,803
Estimated Fair Value	$ 23,520,469	$ 23,210,968
% of Total	100.00%	100.00%
Finance
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 8,250,681	$ 7,977,885
Estimated Fair Value	$ 8,407,037	$ 8,362,774
% of Total	35.80%	36.10%
Industrial
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 12,093,034	$ 11,535,166
Estimated Fair Value	$ 12,437,180	$ 12,199,333
% of Total	52.80%	52.50%
Utility
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 2,547,270	$ 2,453,752
Estimated Fair Value	$ 2,676,252	$ 2,648,861
% of Total	11.40%	11.40%

XML

Investments (Credit Losses Recognized in Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Investments [Abstract]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 3,677	$ 3,677	$ 3,677	$ 6,013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	$ 0	$ (2,336)

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Investments (Fair Value Below Amortized Cost of Gross Unrealized Losses for Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 381,465	$ 116,993
% of Total	100.00%	100.00%
Less than 20%
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 358,873	$ 113,466
% of Total	94.10%	97.00%
20% or more for less than six months
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 20,232	$ 689
% of Total	5.30%	0.60%
20% or more for six months or greater
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 2,360	$ 2,838
% of Total	0.60%	2.40%

XML

Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months		$ 4,565,273
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		40,239
Estimated Fair Value - 12 months or greater		2,738,393
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		73,107
Estimated Fair Value		7,303,666
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		113,346
Equity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months		5,902
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		1,024
Estimated Fair Value - 12 months or greater		73,722
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		2,623
Estimated Fair Value		79,624
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		3,647
Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months		225,474
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		3,450
Estimated Fair Value - 12 months or greater		93,723
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		7,559
Estimated Fair Value		319,197
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		11,009
Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	$ 10,738,781	4,339,799
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	226,619	36,789
Estimated Fair Value - 12 months or greater	2,440,830	2,644,670
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	115,895	65,548
Estimated Fair Value	13,179,611	6,984,469
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	342,514	102,337
Corporate Debt Securities [Member] | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	452,086	194,879
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	29,597	3,317
Estimated Fair Value - 12 months or greater	46,976	75,731
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	8,337	6,933
Estimated Fair Value	499,062	270,610
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	37,934	10,250
Corporate Debt Securities [Member] | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	7,282,079	1,886,212
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	155,541	17,099
Estimated Fair Value - 12 months or greater	883,699	1,009,750
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	46,908	28,080
Estimated Fair Value	8,165,778	2,895,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	202,449	45,179
Canadian and Canadian provincial governments | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	1,900	1,995
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	114	20
Estimated Fair Value - 12 months or greater	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	0	0
Estimated Fair Value	1,900	1,995
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	114	20
Canadian and Canadian provincial governments | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	39,192	18,688
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	390	91
Estimated Fair Value - 12 months or greater	109,552	111,560
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	2,536	1,596
Estimated Fair Value	148,744	130,248
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	2,926	1,687
Residential mortgage-backed securities | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	0	0
Estimated Fair Value - 12 months or greater	1,272	1,369
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	25	22
Estimated Fair Value	1,272	1,369
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	25	22
Residential mortgage-backed securities | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	897,255	566,699
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	19,899	5,852
Estimated Fair Value - 12 months or greater	225,288	224,439
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	7,575	6,004
Estimated Fair Value	1,122,543	791,138
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	27,474	11,856
Asset-backed securities | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	0	0
Estimated Fair Value - 12 months or greater	1,173	1,489
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	47	53
Estimated Fair Value	1,173	1,489
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	47	53
Asset-backed securities | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	612,053	434,274
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	7,001	2,707
Estimated Fair Value - 12 months or greater	114,605	168,524
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	2,423	2,434
Estimated Fair Value	726,658	602,798
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	9,424	5,141
Commercial mortgage-backed securities | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	57,385
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	662
Estimated Fair Value - 12 months or greater	12,045
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	169
Estimated Fair Value	69,430
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	831
Commercial mortgage-backed securities | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	538,464	220,401
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	8,026	1,914
Estimated Fair Value - 12 months or greater	103,447	103,269
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	4,210	2,920
Estimated Fair Value	641,911	323,670
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	12,236	4,834
US Government Agencies Debt Securities [Member] | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	488,095	800,298
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	16,856	6,177
Estimated Fair Value - 12 months or greater	744,844	767,197
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	42,558	15,756
Estimated Fair Value	1,232,939	1,567,495
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	59,414	21,933
US States and Political Subdivisions Debt Securities [Member] | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	511,371
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	30,373
Estimated Fair Value - 12 months or greater	61,466
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	8,578
Estimated Fair Value	572,837
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	38,951
US States and Political Subdivisions Debt Securities [Member] | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	135,158	43,510
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	3,331	242
Estimated Fair Value - 12 months or greater	67,949	68,666
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	4,685	4,054
Estimated Fair Value	203,107	112,176
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	8,016	4,296
Foreign Government Debt Securities [Member] | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	11,250,152	28,600
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	256,992	113
Estimated Fair Value - 12 months or greater	2,502,296	15,134
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	124,473	551
Estimated Fair Value	13,752,448	43,734
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	381,465	664
Foreign Government Debt Securities [Member] | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	746,485	369,717
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	15,575	2,707
Estimated Fair Value - 12 months or greater	191,446	191,265
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	5,000	4,704
Estimated Fair Value	937,931	560,982
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	$ 20,575	7,411
Nonredeemable Preferred Stock [Member] | Equity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months		82
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		1
Estimated Fair Value - 12 months or greater		26,471
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		2,225
Estimated Fair Value		26,553
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		2,226
Other equity securities | Equity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months		5,820
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		1,023
Estimated Fair Value - 12 months or greater		47,251
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		398
Estimated Fair Value		53,071
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		$ 1,421

XML

Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 538,382	$ 533,034
Investment expense	(22,053)	(18,670)
Investment income, net of related expenses	516,329	514,364
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	369,203	324,500
Equity Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	1,682	1,359
Mortgage Loans on Real Estate [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	50,199	44,347
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	14,780	15,272
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	75,445	127,578
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	3,245	1,510
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 23,828	$ 18,468

XML

Investments (Investment Related Gains (Losses) Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments [Abstract]
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments	$ (20,380)	$ (8,687)
Available-for-sale Equity Securities, Gross Unrealized Gain	28	0
Available-for-sale Equity Securities, Gross Unrealized Loss	(950)	(3,876)
Gain (Loss) on Sale of Equity Investments	(4,137)	0
Investment Gains And Losses [Abstract]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0	17,189
Gain on investment activity	10,966	17,893
Other impairment losses and change in mortgage loan provision	(312)	(99)
Derivatives and other, net	14,315	72,481
Total investment related gains (losses), net	$ (470)	$ 60,523

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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Securities Loaned, Fair Value of Collateral	$ 118,617	$ 121,551
Securities Received as Collateral	128,000	128,000
Securities for Reverse Repurchase Agreements	403,135	413,819
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	404,871	417,550
Reported Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	353,875	358,875
Securities Loaned, Fair Value of Collateral	117,449	117,246
Estimate of Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	370,760	377,820
Securities for Reverse Repurchase Agreements	$ 411,988	$ 428,344

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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	$ 118,617	$ 121,551
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	411,988	428,344
Obligation to Return Securities Received as Collateral	530,605	549,895
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	563,587	576,786
SecuredBorrowingsGrossDifferenceAmount	32,982	26,891
Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	118,617	121,551
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	171,678	184,646
Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	219,509	220,765
Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	19,670	21,802
Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	1,131	1,131
Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	1,131	1,131
Obligation to Return Securities Received as Collateral	1,131	1,131
Maturity Overnight [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	0	0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity Overnight [Member] | Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity Overnight [Member] | US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity Overnight [Member] | Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity Overnight [Member] | Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	1,131	1,131
Maturity up to 30 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Obligation to Return Securities Received as Collateral	0	0
Maturity up to 30 days [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	0	0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity up to 30 days [Member] | Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity up to 30 days [Member] | US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity up to 30 days [Member] | Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity up to 30 days [Member] | Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity 30 to 90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	312
Obligation to Return Securities Received as Collateral	0	312
Maturity 30 to 90 Days [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	0	0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	312
Maturity 30 to 90 Days [Member] | Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity 30 to 90 Days [Member] | US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity 30 to 90 Days [Member] | Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity 30 to 90 Days [Member] | Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	410,857	426,901
Obligation to Return Securities Received as Collateral	529,474	548,452
Maturity over 90 days [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	118,617	121,551
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	171,678	184,334
Maturity over 90 days [Member] | Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity over 90 days [Member] | US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	219,509	220,765
Maturity over 90 days [Member] | Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	19,670	21,802
Maturity over 90 days [Member] | Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	$ 0	$ 0

XML

Investments (Mortgage Loans by Property Type) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Percentage of total	100.00%	100.00%
Recorded investment	$ 4,450,291	$ 4,413,171
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(3,433)	(3,254)
Allowance for Loan and Lease Losses, Real Estate	(8,864)	(9,384)	$ (7,786)	$ (7,685)
Mortgage loans on real estate (net of allowances of $8,864 and $9,384)	$ 4,437,994	$ 4,400,533
Apartment
Mortgage Loans on Real Estate [Line Items]
Percentage of total	11.20%	11.60%
Recorded investment	$ 497,699	$ 510,052
Retail
Mortgage Loans on Real Estate [Line Items]
Percentage of total	27.80%	28.80%
Recorded investment	$ 1,236,933	$ 1,270,676
Office building
Mortgage Loans on Real Estate [Line Items]
Percentage of total	34.10%	33.60%
Recorded investment	$ 1,518,170	$ 1,487,392
Industrial
Mortgage Loans on Real Estate [Line Items]
Percentage of total	21.70%	21.30%
Recorded investment	$ 964,685	$ 938,612
Other commercial
Mortgage Loans on Real Estate [Line Items]
Percentage of total	5.20%	4.70%
Recorded investment	$ 232,804	$ 206,439

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Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 4,450,291	$ 4,413,171
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
Due within five years
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 1,130,108	$ 1,091,066
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	25.40%	24.80%
Due after five years through ten years
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 2,492,588	$ 2,516,872
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	56.00%	57.00%
Due after ten years
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 827,595	$ 805,233
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	18.60%	18.20%

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Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 4,450,291	$ 4,413,171
Loans Receivable, Gross, Commercial, Construction	$ 12,279	$ 9,686
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
Mortgage Loans By Credit Quality Indicator Range Four [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 160,433	$ 167,611
Loans Receivable, Gross, Commercial, Construction	$ 0	$ 9,686
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	3.60%	3.80%
Mortgage Loans By Credit Quality Indicator Range Three [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 418,769	$ 431,274
Loans Receivable, Gross, Commercial, Construction	$ 0	$ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	9.40%	9.80%
Mortgage Loans By Credit Quality Indicator Range Two [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 1,617,873	$ 1,608,078
Loans Receivable, Gross, Commercial, Construction	$ 0	$ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	36.40%	36.40%
Mortgage Loans By Credit Quality Indicator Range One [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 2,253,216	$ 2,206,208
Loans Receivable, Gross, Commercial, Construction	$ 12,279	$ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	50.60%	50.00%
Debt Service Coverage Ratio Range Three [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 110,105	$ 69,451
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	4,276	6,362
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	30,904	15,367
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	68,070	43,921
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	6,855	3,801
Debt Service Coverage Ratio Range Two [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	167,712	151,281
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	30,497	30,713
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	27,682	19,461
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	29,795	47,128
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	79,738	53,979
Debt Service Coverage Ratio Range One [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	4,160,195	4,182,753
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	125,660	120,850
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	360,183	396,446
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	1,520,008	1,517,029
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 2,154,344	$ 2,148,428

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Investments (Mortgage Loans Age Analysis) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 19,158	$ 19,156
Financing Receivable, Recorded Investment, Current	4,431,133	4,394,015
Loans Receivable, Gross, Commercial, Real Estate	4,450,291	4,413,171
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	17,102	17,100
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	2,056
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 2,056	$ 0

XML

Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Mortgage Loans:
Recorded investment	$ 4,450,291	$ 4,413,171
Valuation Allowances:
Allowance for Loan and Lease Losses, Real Estate	8,864	9,384	$ 7,786	$ 7,685
Commercial Real Estate Portfolio Segment [Member]
Mortgage Loans:
Evaluated individually for credit losses	23,423	5,858
Evaluated collectively for credit losses	4,426,868	4,407,313
Recorded investment	4,450,291	4,413,171
Valuation Allowances:
Specific for credit losses	0	0
Non-specifically identified credit losses	8,864	9,384
Allowance for Loan and Lease Losses, Real Estate	$ 8,864	$ 9,384

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Investments (Loan Valuation Allowance for Mortgage Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance For Loan And Lease Losses Roll Forward
Balance, Beginning of Period	$ 9,384	$ 7,685
Provision (release)	(516)	101
Valuation Allowances and Reserves, Additions for Adjustments	(4)	0
Balance, End of Period	$ 8,864	$ 7,786

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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		$ 0		$ 6,427
Recorded Investment		23,423		5,858
Related Allowance		0		0
Carrying Value		23,423		5,858
Average Investment	[1]	14,640	$ 2,157
Interest Income		56	33
Impaired mortgage loans with valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		0		0
Recorded Investment		0		0
Related Allowance		0		0
Carrying Value		0		0
Average Investment	[1]	0	0
Interest Income		0	0
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		0		6,427
Recorded Investment		23,423		5,858
Related Allowance		0		0
Carrying Value		23,423		$ 5,858
Average Investment	[1]	14,640	2,157
Interest Income		$ 56	$ 33

[1] verage recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

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Investments (Other Invested Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other invested assets	$ 1,512,147	$ 1,505,332
Limited Partner [Member]
Other invested assets	805,613	781,124
Equity Release Mortgages [Member]
Other invested assets	261,837	219,940
Derivatives
Other invested assets	132,195	137,613
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Other invested assets	221,512	218,541
Other
Other invested assets	$ 90,990	$ 148,114

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Investments (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) securities	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) securities	Dec. 31, 2016 USD ($)
Investment Narrative [Line Items]
Proceeds From Sale Of Available For Sale Securities Sold At Loss	$ 1,263,600	$ 428,600
Sales of fixed maturity securities available-for-sale	1,898,722	1,563,956
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	30,700		$ 31,200
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing	2,400	1,000
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements	400		1,100
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 3,677	3,677	$ 3,677	$ 6,013
Policy Loans Percent Of Total Investments	2.60%		2.60%
Mortgage Loan Percent Of Cash And Invested Assets	8.60%		8.50%
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments	$ 20,380	8,687
Proceeds From Sale Of Available For Sale Equity Securities Sold At Loss	28,400	147,600
Available-for-sale Equity Securities, Gross Unrealized Loss	950	3,876
Available-for-sale Securities, Gross Realized Gains	$ 10,966	17,893
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities	2,114		1,116
Securities As Percentage Of Consolidated Stockholder Equity	10.00%
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%		100.00%
Funds Withheld At Interest Percent Of Total Investments	11.70%		11.80%
Funds withheld at interest	$ 6,005,892		$ 6,083,388
Funds Held Under Reinsurance Agreements Asset Specific Client	$ 4,000,000
Other Invested Assets Percent Of Cash And Invested Assets	2.90%		2.90%
Gain (Loss) on Sale of Equity Investments	$ (4,137)	$ 0
CALIFORNIA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	19.60%
TEXAS
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	8.60%
GEORGIA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	7.50%
CANADA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	2.40%

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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional Amount	$ 16,791,770	$ 15,904,127
Carrying Value / Fair Value of Assets	331,273	320,724
Derivative Liability, Fair Value, Gross Liability	990,777	1,058,727
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	15,059,954	14,243,031
Carrying Value / Fair Value of Assets	268,531	254,252
Derivative Liability, Fair Value, Gross Liability	968,119	1,022,122
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	1,021,739	996,204
Carrying Value / Fair Value of Assets	47,303	59,809
Derivative Liability, Fair Value, Gross Liability	152	2,372
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	388,874	412,438
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	6,012	6,030
Carrying Value / Fair Value of Assets	48	0
Derivative Liability, Fair Value, Gross Liability	4	28
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount	218,237	221,932
Carrying Value / Fair Value of Assets	127	0
Derivative Liability, Fair Value, Gross Liability	427	2,160
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	933,200	961,200
Carrying Value / Fair Value of Assets	7,279	8,319
Derivative Liability, Fair Value, Gross Liability	1,058	1,651
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	639,801	632,251
Carrying Value / Fair Value of Assets	33,958	23,271
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Longevity Swap [Member]
Derivative [Line Items]
Notional Amount	985,920	960,400
Carrying Value / Fair Value of Assets	44,011	40,659
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Mortality Swap [Member]
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	1,683	1,683
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	10,866,171	10,052,576
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	135,805	122,194
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	827,109	861,758
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	137,686	152,470
Designated As Hedging Instrument
Derivative [Line Items]
Notional Amount	1,731,816	1,661,096
Carrying Value / Fair Value of Assets	62,742	66,472
Derivative Liability, Fair Value, Gross Liability	22,658	36,605
Designated As Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	435,000	435,000
Carrying Value / Fair Value of Assets	(1,119)	0
Derivative Liability, Fair Value, Gross Liability	16,972	20,389
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	598,575	672,921
Carrying Value / Fair Value of Assets	56,403	65,207
Derivative Liability, Fair Value, Gross Liability	5,461	8,496
Designated As Hedging Instrument | Forward Contracts [Member]
Derivative [Line Items]
Notional Amount	698,241	553,175
Carrying Value / Fair Value of Assets	7,458	1,265
Derivative Liability, Fair Value, Gross Liability	$ 225	$ 7,720

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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Derivative Assets [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 195,468	$ 198,530
Gross Amounts Offset in the Balance Sheet		(19,262)	(20,258)
Net Amounts Presented in the Balance Sheet		176,206	178,272
Derivative Asset, Fair Value of Collateral	[1]	0	(862)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	[2]	(188,407)	(185,900)
Net Amount		(12,201)	(8,490)
Derivative Liabilities [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability		25,982	44,499
Gross Amounts Offset in the Balance Sheet		(19,262)	(20,258)
Net Amounts Presented in the Balance Sheet		6,720	24,241
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments	[3]	(57,456)	(58,156)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	[4]	(3,470)	(22,221)
Net Amount		$ (54,206)	$ (56,136)

[1] Consists of U.S. Treasury and government securities.

[2] Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.

[3] Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.

[4] Consists of receivable from counterparty, included in other assets.

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Derivative Instruments Derivative Instruments (Fair Value Hedge Attributable to Foreign Currency) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ (1,891)	$ 6,536
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	1,891	(6,536)
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	$ 0	$ 0

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Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (20,662)	$ (7,690)	$ (2,619)	$ 2,496
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	17,817	10,433
Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(144)	(247)
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 370	$ 0

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Derivative Instruments (Cash Flow Hedges) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 17,817	$ 10,433
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	20,662	7,690	$ 2,619	$ (2,496)
Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	144	247
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(370)	0
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	14,986	2,216
Interest Rate Swap [Member] | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	0
Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(370)	0
Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	2,831	8,217
Currency Swap [Member] | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	144	197
Currency Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	0
Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0	0
Forward Contracts [Member] | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	50
Forward Contracts [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 0	$ 0

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Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Net Derivatives Gains (Losses) Deferred in AOCI	[1],[2]	$ 8,805	$ (7,606)
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Net Derivatives Gains (Losses) Deferred in AOCI	[1],[2]	$ 12,236	$ 0

[1] There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.

[2] There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.

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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ (470)	$ 60,523
Policy acquisition costs and other insurance expenses	(356,902)	(379,389)
Interest credited	(80,449)	(107,684)
Other revenues	75,297	68,157
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives	(19,475)	(22,849)
Not Designated as Hedging Instrument
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	34,272	51,814
Not Designated as Hedging Instrument | Interest Rate Swaps
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(26,571)	(2,612)
Not Designated as Hedging Instrument | Financial Futures
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	129	(12,775)
Not Designated as Hedging Instrument | Foreign Currency Forwards
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	323	904
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	2,186	(5)
Not Designated as Hedging Instrument | Credit Default Swaps
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(402)	7,358
Not Designated as Hedging Instrument | Equity Options
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	2,593	(17,189)
Not Designated as Hedging Instrument | Longevity Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Other revenues	2,267	1,865
Not Designated as Hedging Instrument | Mortality Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Other revenues	0	(395)
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	13,611	68,702
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Interest credited	(25,351)	16,402
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ 14,785	$ 22,363

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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 7,095	$ 7,572
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 923,300	$ 951,300
Derivative Average Remaining Maturity	[1],[3]	3 years 2 months	3 years 5 months
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 2,761	$ 3,128
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 152,000	$ 162,000
Derivative Average Remaining Maturity	[1],[3]	3 years	2 years 11 months
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 2,761	$ 3,128
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 152,000	$ 162,000
Derivative Average Remaining Maturity	[1],[3]	3 years	2 years 11 months
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 4,203	$ 4,469
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 333,700	$ 361,700
Derivative Average Remaining Maturity	[1],[3]	2 years 9 months	2 years 11 months
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 156	$ (55)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 422,600	$ 422,600
Derivative Average Remaining Maturity	[1],[3]	3 years 8 months	4 years
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 4,359	$ 4,414
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 756,300	$ 784,300
Derivative Average Remaining Maturity	[1],[3]	3 years 3 months	3 years 6 months
Standard & Poor's, BB Rating [Member]
Credit Derivatives [Line Items]
Derivative Average Remaining Maturity	[1],[2]	1 year 6 months	1 year 6 months
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ (25)	$ 30
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	15,000	5,000
Standard & Poor's, BB Rating [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	(25)	30
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 15,000	$ 5,000

[1] The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).

[2] Assumes the value of the referenced credit obligations is zero.

[3] The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

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Derivative Instruments (Changes in Estimated Fair Value Related to Embedded Derivatives) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements And Variable Annuity Contracts [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 13,611	$ 68,702
Derivative, Gain (Loss) on Derivative, Net	6,850	25,844
Embedded Derivatives In Equity Indexed Annuities [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	25,351	(16,402)
Derivative, Gain (Loss) on Derivative, Net	6,537	(21,396)
Embedded Derivatives In Variable Annuity Contracts [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	14,785	22,363
Derivative, Gain (Loss) on Derivative, Net	$ 11,126	$ 28,836

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Derivative Instruments (Credit Exposure of Derivative Contracts) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Credit Exposure of Derivative Contracts
Estimated fair value of derivatives in net asset (liability) position		$ 171,169	$ 155,714
Derivative, Collateral, Right to Reclaim Cash	[1]	3,470	22,221
Derivative Liability, Fair Value of Collateral	[2]	57,456	58,156
Derivative, Collateral, Obligation to Return Cash	[3]	(188,407)	(185,900)
Derivative Asset, Fair Value of Collateral	[4]	0	(862)
Deposits with Clearing Organizations and Others, Securities	[2]	(57,456)	(58,156)
Net credit exposure		(13,768)	(8,827)
Margin account related to exchange-traded futures	[5]	$ 7,382	$ 6,538

[1] Consists of receivable from counterparty, included in other assets.

[2] Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.

[3] Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.

[4] Consists of U.S. Treasury and government securities.

[5] Included in other assets.

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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges	$ 134.7		$ 113.7
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing	2.4	$ 1.0
Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	0.6
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 0.7

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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 37,945,260	$ 38,150,820
Non Redeemable Preferred Stock Equity Method Investments, Fair Value Disclosure		39,806
Equity Method Investments, Fair Value Disclosure	103,983	60,346
Funds withheld at interest embedded derivatives	135,805	122,194
Cash and cash equivalents	538,761	356,788
Short-term investments	58,499	50,746
Investments, Fair Value Disclosure	353,707	356,154
Other Assets, Fair Value Disclosure	44,011	40,659
Assets, Fair Value Disclosure, Recurring	39,180,026	39,177,513
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	964,795	1,014,228
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	971,515	1,038,469
Interest Rate Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	40,812	51,359
Liabilities Fair Value Disclosure
Other liabilities	(11,752)	(14,311)
Foreign Currency Forwards
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	6,932	730
Liabilities Fair Value Disclosure
Other liabilities	(345)	(7,213)
Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	(99)	(221)
Liabilities Fair Value Disclosure
Other liabilities	(201)	(1,939)
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	221,512	218,541
Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	5,465	5,908
Liabilities Fair Value Disclosure
Other liabilities	(756)	(760)
Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	27,140	16,932
Liabilities Fair Value Disclosure
Other liabilities	(6,818)	(6,339)
Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	51,945	62,905
Liabilities Fair Value Disclosure
Other liabilities	(1,003)	(6,194)
Mortality Swap [Member]
Liabilities Fair Value Disclosure
Other liabilities	(1,683)	(1,683)
Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	23,520,469	23,210,968
Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	4,097,854	4,220,076
Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,787,148	1,719,880
Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,734,722	1,648,362
Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,281,933	1,303,387
US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,436,114	1,943,592
US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	713,513	703,428
Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,373,507	3,401,127
Fair Value Inputs Level 1 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,313,806	1,818,006
Non Redeemable Preferred Stock Equity Method Investments, Fair Value Disclosure		39,806
Equity Method Investments, Fair Value Disclosure	67,831	60,346
Funds withheld at interest embedded derivatives	0	0
Cash and cash equivalents	538,761	354,071
Short-term investments	67	0
Investments, Fair Value Disclosure	221,043	217,618
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure, Recurring	2,141,508	2,489,847
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	0	0
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	0	0
Fair Value Inputs Level 1 Member | Interest Rate Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Foreign Currency Forwards
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	221,043	217,618
Fair Value Inputs Level 1 Member | Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Mortality Swap [Member]
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,313,806	1,818,006
Fair Value Inputs Level 1 Member | US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 2 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	34,438,306	34,098,204
Non Redeemable Preferred Stock Equity Method Investments, Fair Value Disclosure		0
Equity Method Investments, Fair Value Disclosure	0	0
Funds withheld at interest embedded derivatives	0	0
Cash and cash equivalents	0	2,717
Short-term investments	55,215	47,650
Investments, Fair Value Disclosure	132,664	138,536
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure, Recurring	34,626,185	34,287,107
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	0	0
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	5,037	22,558
Fair Value Inputs Level 2 Member | Interest Rate Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	40,812	51,359
Liabilities Fair Value Disclosure
Other liabilities	(11,752)	(14,311)
Fair Value Inputs Level 2 Member | Foreign Currency Forwards
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	6,932	730
Liabilities Fair Value Disclosure
Other liabilities	(345)	(7,213)
Fair Value Inputs Level 2 Member | Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	(99)	(221)
Liabilities Fair Value Disclosure
Other liabilities	(201)	(1,939)
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	469	923
Fair Value Inputs Level 2 Member | Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	5,465	5,908
Liabilities Fair Value Disclosure
Other liabilities	(756)	(760)
Fair Value Inputs Level 2 Member | Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	27,140	16,932
Liabilities Fair Value Disclosure
Other liabilities	(6,818)	(6,339)
Fair Value Inputs Level 2 Member | Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	51,945	62,905
Liabilities Fair Value Disclosure
Other liabilities	(1,003)	(6,194)
Fair Value Inputs Level 2 Member | Mortality Swap [Member]
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	22,221,205	21,873,696
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,525,107	3,626,134
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,666,534	1,611,998
Fair Value Inputs Level 2 Member | Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,604,016	1,524,888
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,280,049	1,300,153
Fair Value Inputs Level 2 Member | US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	101,255	103,075
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	671,637	662,225
Fair Value Inputs Level 2 Member | Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,368,503	3,396,035
Fair Value Inputs Level 3 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,193,148	2,234,610
Non Redeemable Preferred Stock Equity Method Investments, Fair Value Disclosure		0
Equity Method Investments, Fair Value Disclosure	36,152	0
Funds withheld at interest embedded derivatives	135,805	122,194
Cash and cash equivalents	0	0
Short-term investments	3,217	3,096
Investments, Fair Value Disclosure	0	0
Other Assets, Fair Value Disclosure	44,011	40,659
Assets, Fair Value Disclosure, Recurring	2,412,333	2,400,559
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	964,795	1,014,228
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	966,478	1,015,911
Fair Value Inputs Level 3 Member | Interest Rate Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Foreign Currency Forwards
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Fair Value Inputs Level 3 Member | Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Mortality Swap [Member]
Liabilities Fair Value Disclosure
Other liabilities	(1,683)	(1,683)
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,299,264	1,337,272
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	572,747	593,942
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	120,614	107,882
Fair Value Inputs Level 3 Member | Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	130,706	123,474
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,884	3,234
Fair Value Inputs Level 3 Member | US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	21,053	22,511
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	41,876	41,203
Fair Value Inputs Level 3 Member | Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 5,004	$ 5,092

XML

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Fair Value Assets Transfers between Level 1 and Level 2) (Details) - Available-for-sale Securities [Member] - Corporate Debt Securities [Member] $ in Thousands	Mar. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	$ 38,675

XML

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Corporate Debt Securities [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 183,680	$ 173,579
Corporate Debt Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	6.6
Corporate Debt Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	2.00%	2.00%
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	7.5
Corporate Debt Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	0.00%	0.00%
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	5.9
Longevity Swap [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 44,011	$ 40,659
Longevity Swap [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	2.00%	2.00%
Fair Value Inputs Mortality Improvement	3.00%	3.00%
Longevity Swap [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Fair Value Inputs Mortality Improvement	10.00%	10.00%
Longevity Swap [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Fair Value Inputs Mortality Improvement	(10.00%)	(10.00%)
US Government Agencies Debt Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
US Government Agencies Debt Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
US Government Agencies Debt Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	0.00%	0.00%
US States and Political Subdivisions Debt Securities [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 4,452	$ 4,616
US States and Political Subdivisions Debt Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
US States and Political Subdivisions Debt Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
US States and Political Subdivisions Debt Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
Equity Securities [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 25,987	$ 0
Equity Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	8.0
Equity Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	13.1
Equity Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	6.9
Embedded Derivatives In Indexed Annuity [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 827,109	$ 861,758
Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	9.00%	9.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	2.00%	2.00%
Fair Value Inputs Withdrawal	3.00%	3.00%
Fair Value Inputs Option Budget Projection	2.00%	2.00%
Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	35.00%	35.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Fair Value Inputs Withdrawal	5.00%	5.00%
Fair Value Inputs Option Budget Projection	4.00%	4.00%
Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	0.00%	0.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Fair Value Inputs Withdrawal	0.00%	0.00%
Fair Value Inputs Option Budget Projection	2.00%	2.00%
Embedded Derivatives In Variable Annuity [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 137,686	$ 152,470
Embedded Derivatives In Variable Annuity [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	5.00%	5.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	1.00%	1.00%
Fair Value Inputs Withdrawal	4.00%	3.00%
Embedded Derivatives In Variable Annuity [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	25.00%	25.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Fair Value Inputs Withdrawal	7.00%	7.00%
Embedded Derivatives In Variable Annuity [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	0.00%	0.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Fair Value Inputs Withdrawal	0.00%	0.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	1.00%	1.00%
Fair Value Assumptions, Expected Volatility Rate	13.00%	8.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	5.00%	5.00%
Fair Value Assumptions, Expected Volatility Rate	27.00%	27.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	0.00%	0.00%
Fair Value Assumptions, Expected Volatility Rate	0.00%	0.00%
Mortality Swap [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 1,683	$ 1,683
Mortality Swap [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	1.00%	1.00%
Mortality Swap [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Mortality Swap [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 135,805	$ 122,194
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	9.00%	9.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	2.00%	2.00%
Fair Value Inputs Withdrawal	3.00%	3.00%
Fair Value Inputs, Entity Credit Risk	1.00%	1.00%
Fair Value Inputs Credit Rate	2.00%	2.00%
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	35.00%	35.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Fair Value Inputs Withdrawal	5.00%	5.00%
Fair Value Inputs, Entity Credit Risk	5.00%	5.00%
Fair Value Inputs Credit Rate	4.00%	4.00%
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	0.00%	0.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Fair Value Inputs Withdrawal	0.00%	0.00%
Fair Value Inputs, Entity Credit Risk	0.00%	0.00%
Fair Value Inputs Credit Rate	2.00%	2.00%
Total Return Swap [Member] | US Government Agencies Debt Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 21,053	$ 22,511
Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value, Equity, Level 1 to Level 2 Transfers, Description	0
Fair Value, Equity, Level 2 to Level 1 Transfers, Description	0

XML

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017		Dec. 31, 2017	Dec. 31, 2016
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		$ 3,234
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(47)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		1,884
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(1,302)
Commercial Mortgage Backed Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0
US Government Agencies Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		22,511
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(340)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(96)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(1,104)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		21,053
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0
US Government Agencies Debt Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(110)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(110)
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		41,203
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		700
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(35)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		41,876
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0
US States and Political Subdivisions Debt Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		8
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		8
Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		5,092
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(88)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		5,004	$ 12,344
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0
Foreign Government Debt Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0
Foreign Government Debt Securities [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		122,194	(22,529)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		135,805	46,173
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0
Funds Withheld At Interest Embedded Derivatives [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Funds Withheld At Interest Embedded Derivatives [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		13,611	68,702
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		13,611	68,702
Funds Withheld At Interest Embedded Derivatives [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0
Funds Withheld At Interest Embedded Derivatives [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0
Longevity Swap [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		40,659	26,958
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		1,085	347
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		44,011	29,170
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0
Longevity Swap [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Longevity Swap [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0
Longevity Swap [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0
Longevity Swap [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		2,267	1,865
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		2,267	1,865
Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		(964,794)	(972,930)		$ (1,014,229)	$ (990,308)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales	[1]	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3		0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	[1]	(8,508)	(6,393)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	[1]	17,807	17,811
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3			0
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings			0
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		12,901	20,300
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		14,785	22,362
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(7,544)	34,214
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		(25,351)	16,402
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	0
Mortality Swap [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		(1,683)	(2,857)		$ (1,683)	$ (2,462)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3		0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3			0
Mortality Swap [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings			0
Mortality Swap [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	0
Mortality Swap [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	0
Mortality Swap [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	395
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	(395)
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	(28)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(48)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		38,905
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		36,152
Equity Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0
Equity Securities [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(2,705)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(2,677)
Equity Securities [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0
Equity Securities [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0
Short-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		3,096	3,346
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(25)	33
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		(146)	(32)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements		0	(135)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		3,217	3,276
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0
Short-term Investments [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Short-term Investments [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0
Short-term Investments [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0
Short-term Investments [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0
Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		1,337,272	1,272,253
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(32,852)	4,948
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(100,170)	(45,914)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	(6,180)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(75,146)	(71,470)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		7,166	13,934
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		1,299,264	1,263,925
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(30,805)	0
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(361)	(423)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(361)	(423)
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			(1,293)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	(1,231)
Available-for-sale Securities [Member] | Canadian Provincial Governments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		593,942	475,965
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(24,639)	4,525
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		572,747	483,560
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0	0
Available-for-sale Securities [Member] | Canadian Provincial Governments [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		3,444	3,070
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		3,444	3,070
Available-for-sale Securities [Member] | Canadian Provincial Governments [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0
Available-for-sale Securities [Member] | Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		107,882	160,291
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(1,110)	650
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(20,916)	(16,499)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	(10,604)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(2,963)	(6,784)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	77
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		120,614	143,430
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(4,019)	(16,819)
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(92)	(91)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(92)	(245)
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			(346)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	365
Available-for-sale Securities [Member] | Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		123,474	219,280
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		853	5,767
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(11,000)	(10,849)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(2,739)	(18,154)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	35,258
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		130,706	208,436
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(1,990)	(45,582)
Available-for-sale Securities [Member] | Asset-backed securities | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		106	161
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		106	1,018
Available-for-sale Securities [Member] | Asset-backed securities | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		$ 2	0
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value			21,145
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)			(83)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]		(3,720)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]		(5,401)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value			1,923
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			(10,132)
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			709
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			(595)
Available-for-sale Securities [Member] | US Treasury and Government [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value			24,488
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)			52
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]		(104)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]		(1,053)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value			23,474
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			(117)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			(117)
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value			41,666
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)			(843)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]		(33)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value			33,858
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			(6,844)
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			(88)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			(88)
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value			12,869
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)			(191)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]		(334)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			$ 0

[1] The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

XML

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Assets
Mortgage loans on real estate (net of valuation allowances)		$ 4,437,994	$ 4,400,533
Policy loans		1,346,930	1,357,624
Funds withheld at interest		6,005,892	6,083,388
Cash and cash equivalents		1,510,407	1,303,524	$ 1,178,114	$ 1,200,718
Short-term investments		130,430	93,304
Other invested assets		1,512,147	1,505,332
Accrued investment income		408,338	392,721
Liabilities
Interest-sensitive contract liabilities		16,661,602	16,227,642
Long-term debt		2,788,240	2,788,365
Collateral finance and securitization notes		753,393	783,938
Reported Value Measurement [Member]
Assets
Mortgage loans on real estate (net of valuation allowances)		4,437,994	4,400,533
Policy loans		1,346,930	1,357,624
Funds withheld at interest	[1]	5,865,791	5,955,092
Cash and cash equivalents	[2]	971,646	946,736
Short-term investments	[2]	71,931	42,558
Other invested assets	[2]	690,200	651,792
Accrued investment income		408,338	392,721
Liabilities
Interest-sensitive contract liabilities	[1]	13,169,951	12,683,872
Long-term debt		2,788,240
Debt, Long-term and Short-term, Combined Amount			2,788,365
Collateral finance and securitization notes		753,393	783,938
Estimate of Fair Value Measurement [Member]
Assets
Mortgage loans on real estate (net of valuation allowances)		4,411,472	4,477,654
Policy loans		1,346,930	1,357,624
Funds withheld at interest	[1]	6,098,479	6,275,623
Cash and cash equivalents	[2]	971,646	946,736
Short-term investments	[2]	71,931	42,558
Other invested assets	[2]	710,009	679,377
Accrued investment income		408,338	392,721
Liabilities
Interest-sensitive contract liabilities	[1]	13,151,162	12,917,243
Long-term Debt, Fair Value		2,916,200
Debt, Long-term and Short-term, Combined Amount			2,959,912
Collateral finance and securitization notes		692,696	722,145
Estimate of Fair Value Measurement [Member] | Net Asset Value [Member]
Assets
Mortgage loans on real estate (net of valuation allowances)			0
Policy loans			0
Funds withheld at interest	[1]		0
Cash and cash equivalents	[2]		0
Short-term investments	[2]		0
Other invested assets	[2]		335,125
Accrued investment income			0
Liabilities
Interest-sensitive contract liabilities	[1]		0
Debt, Long-term and Short-term, Combined Amount			0
Collateral finance and securitization notes			0
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 1 Member
Assets
Mortgage loans on real estate (net of valuation allowances)		0	0
Policy loans		0	0
Funds withheld at interest	[1]	0	0
Cash and cash equivalents	[2]	971,646	946,736
Short-term investments	[2]	71,931	42,558
Other invested assets	[2]	10,165	28,540
Accrued investment income		0	0
Liabilities
Interest-sensitive contract liabilities	[1]	0	0
Long-term Debt, Fair Value		0
Debt, Long-term and Short-term, Combined Amount			0
Collateral finance and securitization notes		0	0
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 2 Member
Assets
Mortgage loans on real estate (net of valuation allowances)		0	0
Policy loans		1,346,930	1,357,624
Funds withheld at interest	[1]	0	0
Cash and cash equivalents	[2]	0	0
Short-term investments	[2]	0	0
Other invested assets	[2]	68,903	67,778
Accrued investment income		408,338	392,721
Liabilities
Interest-sensitive contract liabilities	[1]	0	0
Long-term Debt, Fair Value		0
Debt, Long-term and Short-term, Combined Amount			0
Collateral finance and securitization notes		0	0
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 3 Member
Assets
Mortgage loans on real estate (net of valuation allowances)		4,411,472	4,477,654
Policy loans		0	0
Funds withheld at interest	[1]	6,098,479	6,275,623
Cash and cash equivalents	[2]	0	0
Short-term investments	[2]	0	0
Other invested assets	[2]	283,205	247,934
Accrued investment income		0	0
Liabilities
Interest-sensitive contract liabilities	[1]	13,151,162	12,917,243
Long-term Debt, Fair Value		2,916,200
Debt, Long-term and Short-term, Combined Amount			2,959,912
Collateral finance and securitization notes		692,696	$ 722,145
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 3 Member | Net Asset Value [Member]
Assets
Mortgage loans on real estate (net of valuation allowances)		0
Policy loans		0
Funds withheld at interest	[1]	0
Cash and cash equivalents	[2]	0
Short-term investments	[2]	0
Other invested assets	[2]	347,736
Accrued investment income		0
Liabilities
Interest-sensitive contract liabilities	[1]	0
Long-term Debt, Fair Value		0
Collateral finance and securitization notes		$ 0

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjM0ZmNkY2I0YzQ1OTQxNDhiN2RkZTcwZmM1M2JhNDhlfFRleHRTZWxlY3Rpb246NUY0Q0UxRDIwRTdGNjQyQzY1MTUzRUJCNjU5NjBEMTYM}

[2] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjM0ZmNkY2I0YzQ1OTQxNDhiN2RkZTcwZmM1M2JhNDhlfFRleHRTZWxlY3Rpb246NzEyRjAxNTg2MkFFMzYwOTJFNzMzRUJCNjU5NjQ5NTYM}

XML

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Equity Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	$ 38,905

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Segment Information (Total Revenues of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 3,173,707	$ 3,008,740
Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,703,046	1,787,349
CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	315,096	276,082
EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	481,925	398,075
Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	634,385	525,682
Corporate and Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	39,255	21,552
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,489,694	1,488,503
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	302,319	264,275
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	393,782	318,086
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	614,539	505,230
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	213,352	298,846
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	12,777	11,807
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	88,143	79,989
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 19,846	$ 20,452

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Segment Information (Income Loss Before Provision for Income Tax of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	$ 137,925	$ 207,844
Americas [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	70,313	133,546
CANADA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	26,898	22,920
EMEA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	54,585	45,894
Asia Pacific [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	26,908	47,560
Corporate and Other [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(40,779)	(42,076)
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	2,892	29,960
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	23,707	19,328
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	15,421	13,976
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	22,887	41,688
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	67,421	103,586
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	3,191	3,592
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	39,164	31,918
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	$ 4,021	$ 5,872

XML

Segment Information (Total Assets of Reportable Segments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 60,954,823	$ 60,514,818
Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	35,189,036	34,562,629
CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,361,000	4,287,824
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	8,664,626	8,374,488
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,270,056	6,114,027
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,470,105	7,175,850
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	18,839,888	18,603,423
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,234,253	4,161,452
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,385,127	3,099,495
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	5,095,054	4,915,442
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	16,349,148	15,959,206
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	126,747	126,372
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	5,279,499	5,274,993
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 1,175,002	$ 1,198,585

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Commitments, Contingencies and Guarantees (Commitments to Fund Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Limited Partner [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 482,149	$ 485,197
Commercial Loan [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	67,837	40,815
Bank Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	96,808	60,472
Equity Release Mortgages [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 132,523	$ 153,937

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Commitments, Contingencies and Guarantees (Maximum Potential Obligation) (Details) $ in Millions	Mar. 31, 2018 USD ($)
Commitment Period Two Thousand Twenty Three [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 500.0
Commitment Period Two Thousand Thirty Three [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	450.0
Commitment Period Two Thousand Thirty Four [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	2,000.0
Commitment Period Two Thousand Thirty Five [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	1,314.2
Commitment Period Two Thousand Thirty Six [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	1,932.0
Commitment Period Two Thousand Thirty Seven [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	6,750.0
Commitment Period Two Thousand Thirty Eight [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 800.0

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Commitments, Contingencies and Guarantees (Guarantees Issued) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Insurance Treaty Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 949,443	$ 1,047,449
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	832,487	926,393
Guarantee Of Borrowed Securities [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	291,325	294,325
Product Financing Arrangement [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	77,858	86,183
Guarantee Of Lease Obligations [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 1,465	$ 1,662

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Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 28,964	$ 72,745
Tax Adjustments, Settlements, and Unusual Provisions	775	0
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	1,432	(6,153)
Income Tax Reconciliation Foreign Income Tax Basis Differential	(5,760)	(3,383)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	7,947	1,182
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	835	611
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	111	(1,237)
Income Tax Reconciliation SubpartF	658	186
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	(572)	(126)
Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income	4,409	0
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	0	229
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	(1,114)	(1,856)	$ 10,500
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	10	134
Income Tax Expense (Benefit)	$ 37,695	$ 62,332
Effective Income Tax Rate Reconciliation, Percent	27.30%	30.00%

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Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,654	$ 2,580
Interest cost	1,330	1,198
Expected return on plan assets	(1,554)	(1,285)
Amortization of prior service cost	83	74
Amortization of prior actuarial loss	1,094	1,081
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0	257
Total	3,607	3,905
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	636	721
Interest cost	530	565
Expected return on plan assets	0	0
Amortization of prior service cost	(329)	(156)
Amortization of prior actuarial loss	498	457
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0	0
Total	$ 1,335	$ 1,587

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Employee Benefit Plans (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.0
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	10.0
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 8.0

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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 810,554	$ 782,027
Reinsurance Recoverables, Percentage of Total	100.00%	100.00%
Other Reinsurers [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 135,342	$ 127,808
Reinsurance Recoverables, Percentage of Total	16.70%	16.20%
AM Best, A+ Rating [Member] | Reinsurer A [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 317,136	$ 301,478
Reinsurance Recoverables, Percentage of Total	39.10%	38.60%
AM Best, A+ Rating [Member] | Reinsurer B [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 203,137	$ 203,898
Reinsurance Recoverables, Percentage of Total	25.10%	26.10%
AM Best, A+ Rating [Member] | Reinsurer E [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 42,538	$ 40,528
Reinsurance Recoverables, Percentage of Total	5.20%	5.20%
AM Best, A++ Rating [Member] | Reinsurer D [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 42,967	$ 40,592
Reinsurance Recoverables, Percentage of Total	5.30%	5.20%
AM Best, A Rating [Member] | Reinsurer C [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 69,434	$ 67,723
Reinsurance Recoverables, Percentage of Total	8.60%	8.70%

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Reinsurance (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Ceded Credit Risk [Line Items]
Reinsurance Claims Recoverables	$ 291.1	$ 243.8
Claims Recoverable From Retrocessionaires Past Due	$ 17.6	$ 1.9
AM Best, A- Rating [Member]
Ceded Credit Risk [Line Items]
Ceded Credit Risk, Disclosure	“A- (excellent)”	“A- (excellent)”

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New Accounting Standards New Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			$ 156,400
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle			17,700
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	$ (1,114)	$ (1,856)	10,500
Contractual Obligation			$ 38,200