10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

(Mark one)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended June 30, 2019

or

☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

For the Transition Period from                      to                     .

Commission File Number 1-15202

W. R. BERKLEY CORPORATION

(Exact name of registrant as specified in its charter)

Delaware			22-1867895
(State or other jurisdiction of incorporation or organization)			(I.R.S. Employer Identification No.)
475 Steamboat Road	Greenwich	Connecticut	06830
(Address of principal executive offices)			(Zip Code)

(203) 629-3000

(Registrant’s telephone number, including area code)

	None
Former name, former address and former fiscal year, if changed since last report.

Securities registered pursuant to Section 12(b) of the Act:

Title	Trading Symbol	Name
Common Stock, par value $.20 per share	WRB	New York Stock Exchange
5.625% Subordinated Debentures due 2053	WRB B	New York Stock Exchange
5.9% Subordinated Debentures due 2056	WRB C	New York Stock Exchange
5.75% Subordinated Debentures due 2056	WRB D	New York Stock Exchange
5.70% Subordinated Debentures due 2058	WRB E	New York Stock Exchange

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 ☒     No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files). Yes ☒     No ☐

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.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

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. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐    No ☒

Number of shares of common stock, $.20 par value, outstanding as of July 30, 2019: 183,176,414

TABLE OF CONTENTS

Part I — FINANCIAL INFORMATION
	Item 1. Financial Statements
	Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
	Item 3. Quantitative and Qualitative Disclosure About Market Risk
	Item 4. Controls and Procedures
PART II — OTHER INFORMATION
	Item 1. Legal Proceedings
	Item 1A. Risk Factors
	Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
	Item 6. Exhibits
SIGNATURES
EX-31.1
EX-31.2
EX-32.1
EX-101 INSTANCE DOCUMENT
EX-101 SCHEMA DOCUMENT
EX-101 CALCULATION LINKBASE DOCUMENT
EX-101 LABELS LINKBASE DOCUMENT
EX-101 PRESENTATION LINKBASE DOCUMENT
EX-101 DEFINITION LINKBASE DOCUMENT

Part I — FINANCIAL INFORMATION

Item 1.     Financial Statements

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands, except share data)

	June 30, 2019			December 31, 2018
	(Unaudited)			(Audited)
Assets
Investments:
Fixed maturity securities	$	13,732,800		$	13,606,812
Real estate	2,067,544			1,957,092
Investment funds	1,401,571			1,332,818
Arbitrage trading account	533,442			452,548
Equity securities	416,588			279,006
Loans receivable	94,697			94,813
Total investments	18,246,642			17,723,089
Cash and cash equivalents	1,258,174			817,602
Premiums and fees receivable	2,034,036			1,807,762
Due from reinsurers	2,040,250			1,932,291
Deferred policy acquisition costs	520,908			497,629
Prepaid reinsurance premiums	538,358			498,880
Trading account receivables from brokers and clearing organizations	402,361			347,228
Property, furniture and equipment	398,885			416,372
Goodwill	173,037			173,037
Accrued investment income	140,864			144,481
Federal and foreign income taxes	—			36,193
Other assets	734,388			501,413
Total assets	$	26,487,903		$	24,895,977
Liabilities and Equity
Liabilities:
Reserves for losses and loss expenses	$	12,320,278		$	11,966,448
Unearned premiums	3,614,152			3,359,991
Due to reinsurers	294,949			256,917
Trading account securities sold but not yet purchased	159,349			38,120
Federal and foreign income taxes	38,437			—
Other liabilities	1,258,995			1,005,184
Senior notes and other debt	1,873,799			1,882,028
Subordinated debentures	907,866			907,491
Total liabilities	20,467,825			19,416,179
Equity:
Preferred stock, par value $.10 per share:
Authorized 5,000,000 shares; issued and outstanding - none	—			—
Common stock, par value $.20 per share:
Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 183,168,398 and 182,993,640 shares, respectively	70,535			70,535
Additional paid-in capital	1,058,416			1,039,633
Retained earnings	7,826,015			7,558,619
Accumulated other comprehensive loss	(260,796		)	(510,470		)
Treasury stock, at cost, 169,508,366 and 169,683,237 shares, respectively	(2,717,410		)	(2,720,466		)
Total stockholders’ equity	5,976,760			5,437,851
Noncontrolling interests	43,318			41,947
Total equity	6,020,078			5,479,798
Total liabilities and equity	$	26,487,903		$	24,895,977

See accompanying notes to interim consolidated financial statements.

1

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

(In thousands, except per share data)

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2019			2018			2019			2018
REVENUES:
Net premiums written	$	1,743,464		$	1,624,104		$	3,453,065		$	3,289,442
Change in net unearned premiums	(96,623		)	(43,051		)	(213,368		)	(140,981		)
Net premiums earned	1,646,841			1,581,053			3,239,697			3,148,461
Net investment income	188,333			153,777			346,587			328,295
Net realized and unrealized gains on investments	73,574			69,631			142,226			118,095
Revenues from non-insurance businesses	89,297			76,698			181,124			146,869
Insurance service fees	22,446			29,719			47,759			60,393
Other income	2,893			38			3,013			50
Total revenues	2,023,384			1,910,916			3,960,406			3,802,163
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	1,028,830			973,636			2,017,479			1,936,856
Other operating costs and expenses	591,828			593,142			1,179,916			1,203,581
Expenses from non-insurance businesses	88,272			75,191			178,397			144,734
Interest expense	40,718			39,705			81,439			76,760
Total operating costs and expenses	1,749,648			1,681,674			3,457,231			3,361,931
Income before income taxes	273,736			229,242			503,175			440,232
Income tax expense	(56,309		)	(48,464		)	(104,134		)	(91,881		)
Net income before noncontrolling interests	217,427			180,778			399,041			348,351
Noncontrolling interests	(718		)	(703		)	(1,610		)	(1,879		)
Net income to common stockholders	$	216,709		$	180,075		$	397,431		$	346,472
NET INCOME PER SHARE:
Basic	$	1.14		$	0.95		$	2.09		$	1.83
Diluted	$	1.12		$	0.93		$	2.06		$	1.80

See accompanying notes to interim consolidated financial statements.

2

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

(In thousands)

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2019			2018			2019			2018
Net income before noncontrolling interests	$	217,427		$	180,778		$	399,041		$	348,351
Other comprehensive income (loss):
Change in unrealized currency translation adjustments	(14,492		)	(104,455		)	5,268			(91,656		)
Change in unrealized investment gains (losses), net of taxes	118,649			(32,442		)	244,424			(158,214		)
Other comprehensive income (loss)	104,157			(136,897		)	249,692			(249,870		)
Comprehensive income	321,584			43,881			648,733			98,481
Noncontrolling interests	(748		)	(666		)	(1,592		)	(1,853		)
Comprehensive income to common stockholders	$	320,836		$	43,215		$	647,141		$	96,628

See accompanying notes to interim consolidated financial statements.

3

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED)

(In thousands)

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2019			2018			2019			2018
COMMON STOCK:
Beginning and end of period	$	70,535		$	70,535		$	70,535		$	70,535
ADDITIONAL PAID-IN CAPITAL:
Beginning of period	$	1,053,372		$	1,033,718		$	1,039,633		$	1,024,771
Restricted stock units issued	(2,049		)	(5,155		)	(2,504		)	(5,642		)
Restricted stock units expensed	7,093			8,233			21,287			17,667
End of period	$	1,058,416		$	1,036,796		$	1,058,416		$	1,036,796
RETAINED EARNINGS:
Beginning of period	$	7,721,039		$	7,322,201		$	7,558,619		$	6,956,882
Cumulative effect adjustment resulting from changes in accounting principles	—			—			—			215,939
Net income to common stockholders	216,709			180,075			397,431			346,472
Dividends ($0.61, $0.43, $0.71 and $0.53 per share, respectively)	(111,733		)	(79,114		)	(130,035		)	(96,131		)
End of period	$	7,826,015		$	7,423,162		$	7,826,015		$	7,423,162
ACCUMULATED OTHER COMPREHENSIVE LOSS:
Unrealized investment gains:
Beginning of period	$	34,236		$	35,099		$	(91,491	)	$	375,421
Cumulative effect adjustment resulting from changes in accounting principles	—			—			—			(214,539		)
Change in unrealized gains (losses) on securities not other-than-temporarily impaired	118,597			(32,403		)	244,393			(158,199		)
Change in unrealized gains (losses) on other-than-temporarily impaired securities	82			(2		)	13			11
End of period	152,915			2,694			152,915			2,694
Currency translation adjustments:
Beginning of period	(399,219		)	(294,081		)	(418,979		)	(306,880		)
Net change in period	(14,492		)	(104,455		)	5,268			(91,656		)
End of period	(413,711		)	(398,536		)	(413,711		)	(398,536		)
Total accumulated other comprehensive loss	$	(260,796	)	$	(395,842	)	$	(260,796	)	$	(395,842	)
TREASURY STOCK:
Beginning of period	$	(2,720,011	)	$	(2,715,697	)	$	(2,720,466	)	$	(2,709,386	)
Stock exercised/vested	2,049			6,475			2,504			6,963
Stock repurchased	—			—			—			(6,799		)
Stock issued	552			688			552			688
End of period	$	(2,717,410	)	$	(2,708,534	)	$	(2,717,410	)	$	(2,708,534	)
NONCONTROLLING INTERESTS:
Beginning of period	$	42,844		$	40,404		$	41,947		$	39,819
Distributions	(274		)	(1,560		)	(221		)	(2,162		)
Net income	718			703			1,610			1,879
Other comprehensive income (loss), net of tax	30			(37		)	(18		)	(26		)
End of period	$	43,318		$	39,510		$	43,318		$	39,510

See accompanying notes to interim consolidated financial statements.

4

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

(In thousands)

	For the Six Months Ended June 30,
	2019			2018
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$	397,431		$	346,472
Adjustments to reconcile net income to net cash from (used in) operating activities:
Net realized and unrealized gains on investments	(142,226		)	(118,095		)
Depreciation and amortization	51,289			56,372
Noncontrolling interests	1,610			1,879
Investment funds	(58,251		)	(53,070		)
Stock incentive plans	27,340			19,722
Change in:
Arbitrage trading account	(14,797		)	(7,871		)
Premiums and fees receivable	(223,771		)	(152,832		)
Reinsurance accounts	(112,681		)	(77,140		)
Deferred policy acquisition costs	(23,632		)	(11,152		)
Income taxes	2,759			(39,069		)
Reserves for losses and loss expenses	350,981			123,582
Unearned premiums	254,010			171,468
Other	(107,416		)	(140,904		)
Net cash from operating activities	402,646			119,362
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	1,320,079			2,773,554
Proceeds from sale of equity securities	39,103			284,204
Contributions to investment funds	(2,896		)	(4,996		)
Proceeds from maturities and prepayments of fixed maturity securities	1,490,772			1,305,805
Purchase of fixed maturity securities	(2,633,251		)	(4,062,901		)
Purchase of equity securities	(41,849		)	(87,059		)
Real estate purchased	(117,773		)	(419,021		)
Change in loans receivable	140			(16,310		)
Net additions to property, furniture and equipment	(10,804		)	(29,704		)
Change in balances due to security brokers	19,096			46,641
Payment for business purchased net of cash acquired	—			(6,637		)
Net cash from (used in) investing activities	62,617			(216,424		)
CASH (USED IN) FROM FINANCING ACTIVITIES:
Repayment of senior notes and other debt	—			(23		)
Net proceeds from issuance of debt	—			200,838
Cash dividends to common stockholders	(18,302		)	(77,873		)
Purchase of common treasury shares	—			(6,799		)
Other, net	(5,548		)	(1,763		)
Net cash (used in) from financing activities	(23,850		)	114,380
Net impact on cash due to change in foreign exchange rates	(841		)	(56,587		)
Net change in cash and cash equivalents	440,572			(39,269		)
Cash and cash equivalents at beginning of year	817,602			950,471
Cash and cash equivalents at end of period	$	1,258,174		$	911,202

See accompanying notes to interim consolidated financial statements.

5

W. R. Berkley Corporation and Subsidiaries

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

(1) General

The unaudited consolidated financial statements, which include the accounts of W. R. Berkley Corporation and its subsidiaries (the “Company”) have been prepared on the basis of U.S. generally accepted accounting principles (“GAAP”) for interim financial information. Accordingly, they do not include all the information and notes required by GAAP for annual financial statements. The unaudited consolidated financial statements reflect all adjustments, consisting only of normal recurring items, which are necessary to present fairly the Company’s financial position and results of operations on a basis consistent with the prior audited consolidated financial statements. Operating results for interim periods are not necessarily indicative of the results that may be expected for the year. All significant intercompany accounts and transactions have been eliminated. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the revenues and expenses reflected during the reporting period. For further information related to areas of judgment and estimates and other information necessary to understand the Company’s financial position and results of operations, refer to the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

Reclassifications have been made in the 2018 financial statements as originally reported to conform to the presentation of the 2019 financial statements. Shares outstanding and per share amounts have been adjusted to reflect the 3-for-2 common stock split effected on April 2, 2019. Additionally, commencing with the first quarter of 2019, the Company renamed the Reinsurance segment to Reinsurance & Monoline Excess, and reclassified the monoline excess business from the Insurance segment. The reclassified business includes operations that solely retain risk on an excess basis.

The income tax provision has been computed based on the Company’s estimated annual effective tax rate. The effective tax rate for the quarter differs from the federal income tax rate of 21% principally because of tax-exempt investment income, as well as tax on income from foreign jurisdictions with different tax rates.

(2) Per Share Data

The Company presents both basic and diluted net income per share (“EPS”) amounts. Basic EPS is calculated by dividing net income by the weighted average number of common shares outstanding during the period (including 7,389,781 and 7,270,954 common shares held in a grantor trust as of June 30, 2019 and 2018, respectively). The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since the shares deliverable under vested RSUs were already included in diluted shares outstanding. Diluted EPS is based upon the weighted average number of basic and common equivalent shares outstanding during the period and is calculated using the treasury stock method for stock incentive plans. Common equivalent shares are excluded from the computation in periods in which they have an anti-dilutive effect.

The weighted average number of common shares used in the computation of basic and diluted earnings per share was as follows:

	For the Three Months Ended June 30,		For the Six Months Ended June 30,
(In thousands)	2019	2018	2019	2018
Basic	190,512	189,776	190,456	189,669
Diluted	193,059	192,509	192,804	192,284

(3) Recent Accounting Pronouncements

Recently adopted accounting pronouncements:

In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02, Leases, which amends the accounting and disclosure guidance for leases. This guidance retains the two classifications of a lease, as either an operating or finance lease, both of which require lessees to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months. The right-of-use asset and the lease liability are determined based upon the present value of cash flows. Finance leases reflect the financial arrangement by recognizing interest expense on the lease liability separately from the amortization expense of the right-of-use asset. Operating leases recognize lease expense (with no separate recognition of interest expense) on a straight-line basis over the term of the lease. The accounting

6

by lessors is not significantly changed by the updated guidance. The updated guidance was effective for reporting periods beginning after December 15, 2018. As permitted by the rules, the Company adopted the new guidance prospectively for the quarter ended March 31, 2019. The Company elected to use the practical expedient permitted by the transition guidance which allowed companies to not reassess existing lease classifications for already effective leases. The adoption of this guidance resulted in the recognition of a right-of-use asset of $185 million and a lease liability of $215 million (prior to adoption the Company had a $30 million deferred rent liability recognized) reported within other assets and other liabilities, respectively, in the consolidated balance sheet. The adoption of this guidance did not have an impact on the Company's results of operations or liquidity.

All other accounting and reporting standards that have become effective in 2019 were either not applicable to the Company or their adoption did not have a material impact on the Company. 

Accounting and reporting standards that are not yet effective:

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which amends the accounting guidance for credit losses on financial instruments. The updated guidance amends the current other-than-temporary impairment model for available-for-sale debt securities by requiring the recognition of impairments relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. This guidance also applies a new current expected credit loss model for determining credit-related impairments for financial instruments measured at amortized cost, such as reinsurance recoverables. The updated guidance is effective for reporting periods beginning after December 15, 2019. The Company will not be able to determine the impact the adoption of this guidance will have on its results of operations, financial position or liquidity until the year the guidance becomes effective.

All other recently issued but not yet effective accounting and reporting standards are either not applicable to the Company or are not expected to have a material impact on the Company.

7

(4) Consolidated Statement of Comprehensive Income

The following table presents the components of the changes in accumulated other comprehensive (loss) income ("AOCI"):

(In thousands)	Unrealized Investment Gains (Losses)				Currency Translation Adjustments			Accumulated Other Comprehensive (Loss) Income
As of and for the six months ended June 30, 2019
Changes in AOCI
Beginning of period	$	(91,491	)		$	(418,979	)	$	(510,470	)
Other comprehensive income before reclassifications	245,615				5,268			250,883
Amounts reclassified from AOCI	(1,191		)		—			(1,191		)
Other comprehensive income	244,424				5,268			249,692
Unrealized investment loss related to noncontrolling interest	(18		)		—			(18		)
End of period	$	152,915			$	(413,711	)	$	(260,796	)
Amounts reclassified from AOCI
Pre-tax	$	(1,508	)	(1)	$	—		$	(1,508	)
Tax effect	317			(2)	—			317
After-tax amounts reclassified	$	(1,191	)		$	—		$	(1,191	)
Other comprehensive income
Pre-tax	$	316,331			$	5,268		$	321,599
Tax effect	(71,907		)		—			(71,907		)
Other comprehensive income	$	244,424			$	5,268		$	249,692
As of and for the three months ended June 30, 2019
Changes in AOCI
Beginning of period	$	34,236			$	(399,219	)	$	(364,983	)
Other comprehensive income (loss) before reclassifications	118,475				(14,492		)	103,983
Amounts reclassified from AOCI	174				—			174
Other comprehensive income (loss)	118,649				(14,492		)	104,157
Unrealized investment losses related to noncontrolling interest	30				—			30
Ending balance	$	152,915			$	(413,711	)	$	(260,796	)
Amounts reclassified from AOCI
Pre-tax	$	220		(1)	$	—		$	220
Tax effect	(46		)	(2)	—			(46		)
After-tax amounts reclassified	$	174			$	—		$	174
Other comprehensive income (loss)
Pre-tax	$	147,072			$	(14,492	)	$	132,580
Tax effect	(28,423		)		—			(28,423		)
Other comprehensive income (loss)	$	118,649			$	(14,492	)	$	104,157

_________________________

⁽¹⁾ Net realized and unrealized gains on investments in the consolidated statements of income.

⁽²⁾ Income tax expense in the consolidated statements of income.

8

(In thousands)	Unrealized Investment Gains (Losses)				Currency Translation Adjustments			Accumulated Other Comprehensive (Loss) Income
As of and for the six months ended June 30, 2018
Changes in AOCI
Beginning of period	$	375,421			$	(306,880	)	$	68,541
Cumulative effect adjustment resulting from changes in accounting principles	(214,539		)		—			(214,539		)
Restated beginning of period	160,882				(306,880		)	(145,998		)
Other comprehensive loss before reclassifications	(147,632		)		(91,656		)	(239,288		)
Amounts reclassified from AOCI	(10,582		)		—			(10,582		)
Other comprehensive loss	(158,214		)		(91,656		)	(249,870		)
Unrealized investment loss related to noncontrolling interest	26				—			26
End of period	$	2,694			$	(398,536	)	$	(395,842	)
Amounts reclassified from AOCI
Pre-tax	$	(13,395	)	(1)	$	—		$	(13,395	)
Tax effect	2,813			(2)	—			2,813
After-tax amounts reclassified	$	(10,582	)		$	—		$	(10,582	)
Other comprehensive loss
Pre-tax	$	(201,336	)		$	(91,656	)	$	(292,992	)
Tax effect	43,122				—			43,122
Other comprehensive loss	$	(158,214	)		$	(91,656	)	$	(249,870	)
As of and for the three months ended June 30, 2018
Changes in AOCI
Beginning of period	$	35,099			$	(294,081	)	$	(258,982	)
Other comprehensive loss before reclassifications	(29,443		)		(104,455		)	(133,898		)
Amounts reclassified from AOCI	(2,999		)		—			(2,999		)
Other comprehensive loss	(32,442		)		(104,455		)	(136,897		)
Unrealized investment loss related to noncontrolling interest	37				—			37
Ending balance	$	2,694			$	(398,536	)	$	(395,842	)
Amounts reclassified from AOCI
Pre-tax	$	(3,796	)	(1)	$	—		$	(3,796	)
Tax effect	797			(2)	—			797
After-tax amounts reclassified	$	(2,999	)		$	—		$	(2,999	)
Other comprehensive loss
Pre-tax	$	(40,488	)		$	(104,455	)	$	(144,943	)
Tax effect	8,046				—			8,046
Other comprehensive loss	$	(32,442	)		$	(104,455	)	$	(136,897	)

_________________________

⁽¹⁾ Net realized and unrealized gains on investments in the consolidated statements of income.

⁽²⁾ Income tax expense in the consolidated statements of income.

9

(5) Statements of Cash Flows

Interest payments were $77,672,000 and $72,878,000 and income taxes paid were $82,800,000 and $111,000,000 for the six months ended June 30, 2019 and 2018, respectively.

(6) Investments in Fixed Maturity Securities

At June 30, 2019 and December 31, 2018, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2019
Held to maturity:
State and municipal	$	69,167	$	13,089	$	—		$	82,256	$	69,167
Residential mortgage-backed	9,380		1,083		—			10,463		9,380
Total held to maturity	78,547		14,172		—			92,719		78,547
Available for sale:
U.S. government and government agency	760,247		18,241		(1,418		)	777,070		777,070
State and municipal:
Special revenue	2,322,750		63,204		(2,674		)	2,383,280		2,383,280
State general obligation	320,338		22,108		(43		)	342,403		342,403
Pre-refunded	298,825		19,876		(122		)	318,579		318,579
Corporate backed	238,319		7,065		(639		)	244,745		244,745
Local general obligation	427,233		32,026		(443		)	458,816		458,816
Total state and municipal	3,607,465		144,279		(3,921		)	3,747,823		3,747,823
Mortgage-backed securities:
Residential (1)	1,242,880		28,521		(5,316		)	1,266,085		1,266,085
Commercial	303,332		6,829		(380		)	309,781		309,781
Total mortgage-backed securities	1,546,212		35,350		(5,696		)	1,575,866		1,575,866
Asset-backed	2,719,618		9,874		(27,707		)	2,701,785		2,701,785
Corporate:
Industrial	2,178,339		59,623		(7,755		)	2,230,207		2,230,207
Financial	1,431,612		27,484		(5,373		)	1,453,723		1,453,723
Utilities	312,200		12,548		(426		)	324,322		324,322
Other	27,027		1,096		(90		)	28,033		28,033
Total corporate	3,949,178		100,751		(13,644		)	4,036,285		4,036,285
Foreign government	818,276		20,507		(23,359		)	815,424		815,424
Total available for sale	13,400,996		329,002		(75,745		)	13,654,253		13,654,253
Total investments in fixed maturity securities	$	13,479,543	$	343,174	$	(75,745	)	$	13,746,972	$	13,732,800

10

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Held to maturity:
State and municipal	$	67,891	$	11,549	$	—		$	79,440	$	67,891
Residential mortgage-backed	10,744		1,259		—			12,003		10,744
Total held to maturity	78,635		12,808		—			91,443		78,635
Available for sale:
U.S. government and government agency	697,931		9,219		(4,910		)	702,240		702,240
State and municipal:
Special revenue	2,396,089		30,507		(19,790		)	2,406,806		2,406,806
State general obligation	335,626		11,951		(1,103		)	346,474		346,474
Pre-refunded	408,141		16,568		(30		)	424,679		424,679
Corporate backed	272,440		4,319		(2,350		)	274,409		274,409
Local general obligation	403,219		18,350		(1,339		)	420,230		420,230
Total state and municipal	3,815,515		81,695		(24,612		)	3,872,598		3,872,598
Mortgage-backed securities:
Residential (1)	1,264,376		7,729		(20,225		)	1,251,880		1,251,880
Commercial	345,070		1,304		(3,708		)	342,666		342,666
Total mortgage-backed securities	1,609,446		9,033		(23,933		)	1,594,546		1,594,546
Asset-backed	2,462,303		10,131		(33,687		)	2,438,747		2,438,747
Corporate:
Industrial	2,295,778		15,355		(53,312		)	2,257,821		2,257,821
Financial	1,502,427		7,178		(45,683		)	1,463,922		1,463,922
Utilities	330,326		2,997		(4,148		)	329,175		329,175
Other	60,238		322		(167		)	60,393		60,393
Total corporate	4,188,769		25,852		(103,310		)	4,111,311		4,111,311
Foreign government	822,093		11,753		(25,111		)	808,735		808,735
Total available for sale	13,596,057		147,683		(215,563		)	13,528,177		13,528,177
Total investments in fixed maturity securities	$	13,674,692	$	160,491	$	(215,563	)	$	13,619,620	$	13,606,812

____________

(1) Gross unrealized losses for residential mortgage-backed securities include $(42,762) and $(55,090) as of June 30, 2019 and December 31, 2018, respectively, related to securities with the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.

The amortized cost and fair value of fixed maturity securities at June 30, 2019, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.

 

(In thousands)	Amortized Cost		Fair Value
Due in one year or less	$	1,017,744	$	1,022,427
Due after one year through five years	4,680,578		4,764,795
Due after five years through ten years	3,226,328		3,347,580
Due after ten years	2,999,301		3,025,841
Mortgage-backed securities	1,555,592		1,586,329
Total	$	13,479,543	$	13,746,972

At June 30, 2019 and December 31, 2018, there were no investments that exceeded 10% of common stockholders' equity, other than investments in United States government and government agency securities.

11

(7) Investments in Equity Securities

At June 30, 2019 and December 31, 2018, investments in equity securities were as follows:

 

(In thousands)	Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2019
Common stocks	$	153,440	$	8,092	$	(21,306	)	$	140,226	$	140,226
Preferred stocks	101,423		180,316		(5,377		)	276,362		276,362
Total	$	254,863	$	188,408	$	(26,683	)	$	416,588	$	416,588
December 31, 2018
Common stocks	$	113,576	$	4,335	$	(19,719	)	$	98,192	$	98,192
Preferred stocks	115,201		72,364		(6,751		)	180,814		180,814
Total	$	228,777	$	76,699	$	(26,470	)	$	279,006	$	279,006

(8) Arbitrage Trading Account

At June 30, 2019 and December 31, 2018, the fair and carrying values of the arbitrage trading account were $533 million and $453 million, respectively. The primary focus of the trading account is merger arbitrage. Merger arbitrage is the business of investing in the securities of publicly held companies which are the targets in announced tender offers and mergers. Arbitrage investing differs from other types of investing in its focus on transactions and events believed likely to bring about a change in value over a relatively short time period (usually four months or less).

The Company uses put options, call options and swap contracts in order to mitigate the impact of potential changes in market conditions on the merger arbitrage trading account. These options and contracts are reported at fair value. As of June 30, 2019, the fair value of long option contracts outstanding was $313 thousand (notional amount of $9.9 million) and the fair value of short option contracts outstanding was $291 thousand (notional amount of $15.6 million). Other than with respect to the use of these trading account securities, the Company does not make use of derivatives.

(9) Net Investment Income

Net investment income consists of the following: 

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2019			2018			2019			2018
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	128,903		$	129,665		$	261,022		$	252,911
Investment funds	46,840			12,716			58,251			53,070
Arbitrage trading account	7,199			8,333			17,784			13,524
Real estate	5,174			3,174			9,481			9,742
Equity securities	1,303			559			2,591			1,205
Gross investment income	189,419			154,447			349,129			330,452
Investment expense	(1,086		)	(670		)	(2,542		)	(2,157		)
Net investment income	$	188,333		$	153,777		$	346,587		$	328,295

12

(10) Investment Funds

The Company evaluates whether it is an investor in a variable interest entity ("VIE"). Such entities do not have sufficient equity at risk to finance their activities without additional subordinated financial support, or the equity investors, as a group, do not have the characteristics of a controlling financial interest (primary beneficiary).  The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose, and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE and on an ongoing basis. The Company is not the primary beneficiary in any of its investment funds, and accordingly, carries its interests in investment funds under the equity method of accounting.

The Company’s maximum exposure to loss with respect to these investments is limited to the carrying amount reported on the Company’s consolidated balance sheet and its unfunded commitments, which were $241 million as of June 30, 2019.

Investment funds consisted of the following:

	Carrying Value as of				Income (Loss) from Investment Funds
	June 30,		December 31,		For the Six Months Ended June 30,
(In thousands)	2019		2018		2019			2018
Real estate	$	654,610	$	642,137	$	13,078		$	35,826
Energy	75,053		75,213		(7,100		)	(1,256		)
Other funds	671,908		615,468		52,273			18,500
Total	$	1,401,571	$	1,332,818	$	58,251		$	53,070

The Company's share of the earnings or losses of investment funds is generally reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.

(11) Real Estate

Investment in real estate represents directly owned property held for investment, as follows:

	Carrying Value
	June 30,		December 31,
(In thousands)	2019		2018
Properties in operation	$	1,310,149	$	1,279,584
Properties under development	757,395		677,508
Total	$	2,067,544	$	1,957,092

In 2019, properties in operation included a long-term ground lease in Washington, D.C., a hotel in Memphis, Tennessee, two office complexes in New York City, office buildings in West Palm Beach and Palm Beach, Florida, and an office building in London. Properties in operation are net of accumulated depreciation and amortization of $55,515,000 and $46,250,000 as of June 30, 2019 and December 31, 2018, respectively. Related depreciation expense was $8,931,000 and $10,784,000 for the six months ended June 30, 2019 and 2018, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $32,963,388 in 2019, $66,249,918 in 2020, $68,157,589 in 2021, $71,308,839 in 2022, $64,897,648 in 2023, $62,673,400 in 2024 and $666,203,503 thereafter.

The Company borrowed $101,750,000 through a non-recourse loan secured by the West Palm Beach office building in 2018. The loan matures in November 2028 and carries a fixed interest rate of 4.21%. The carrying value does not reflect the outstanding financing, but rather is reflected within senior notes and other debt on the Company's consolidated balance sheet.

A mixed-use project in Washington, D.C. has been under development in 2018 and 2019.

13

(12) Loans Receivable

Loans receivable are as follows:

(In thousands)	June 30, 2019			December 31, 2018
Amortized cost (net of valuation allowance):
Real estate loans	$	61,830		$	62,289
Commercial loans	32,867			32,524
Total	$	94,697		$	94,813
Fair value:
Real estate loans	$	62,536		$	63,047
Commercial loans	34,369			34,026
Total	$	96,905		$	97,073
Valuation allowance:
Specific	$	341		$	1,200
General	1,949			2,183
Total	$	2,290		$	3,383
	For the Three Months Ended June 30,
	2019			2018
Change in valuation allowance	$	(1,093	)	$	—
	For the Six Months Ended June 30,
	2019			2018
Change in valuation allowance	$	(1,093	)	$	—

Loans receivable in non-accrual status were $0.4 million and $1.2 million as of June 30, 2019 and December 31, 2018.

The Company monitors the performance of its loans receivable and assesses the ability of the borrower to pay principal and interest based upon loan structure, underlying property values, cash flow and related financial and operating performance of the property and market conditions. Loans receivable with a potential for default are further assessed using discounted cash flow analysis and comparable cost and sales methodologies, if appropriate.

The real estate loans are secured by commercial real estate primarily located in New York. These loans generally earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025. The commercial loans are with small business owners who have secured the related financing with the assets of the business. Commercial loans primarily earn interest on a fixed basis and have varying maturities generally not exceeding 10 years.

In evaluating the real estate loans, the Company considers their credit quality indicators, including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower’s financial condition and performance with respect to loan terms, the position in the capital structure, the overall leverage in the capital structure and other market conditions. Based on these considerations, none of the real estate loans were considered to be impaired at June 30, 2019, and accordingly, the Company determined that a specific valuation allowance was not required.

14

(13) Net Realized and Unrealized Gains (Losses) on Investments

 Net realized and unrealized gains (losses) on investments are as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2019			2018			2019			2018
Net realized and unrealized gains (losses) on investments in earnings
Fixed maturity securities:
Gains	$	3,157		$	7,921		$	8,403		$	21,260
Losses	(3,377		)	(4,125		)	(6,895		)	(7,865		)
Equity securities (1):
Net realized (losses) gains on investment sales	(6		)	119,422			23,339			241,743
Change in unrealized gains (losses)	69,418			(54,652		)	111,496			(148,857		)
Investment funds	41			(353		)	58			(234		)
Real estate	3,021			(402		)	5,767			7,596
Loans receivable	—			1			(970		)	2,059
Other	1,320			1,819			1,028			2,393
Net realized and unrealized gains on investments in earnings before OTTI	73,574			69,631			142,226			118,095
Other-than-temporary impairments	—			—			—			—
Net realized and unrealized gains on investments in earnings	73,574			69,631			142,226			118,095
Income tax expense	(15,451		)	(14,623		)	(29,867		)	(24,800		)
After-tax net realized and unrealized gains on investments in earnings	$	58,123		$	55,008		$	112,359		$	93,295

Change in unrealized investment gains (losses) of available for sale securities:
Fixed maturity securities	$	146,629		$	(36,848	)	$	321,123		$	(196,575	)
Previously impaired fixed maturity securities	81			(2		)	12			11
Investment funds	361			(3,638		)	(4,804		)	(4,772		)
Total change in unrealized investment gains (losses)	147,071			(40,488		)	316,331			(201,336		)
Income tax (expense) benefit	(28,422		)	8,118			(71,907		)	43,194
Noncontrolling interests	30			37			(18		)	26
After-tax change in unrealized investment gains (losses) of available for sale securities	$	118,679		$	(32,333	)	$	244,406		$	(158,116	)

______________________

(1) The net realized gains or losses on investment sales represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains consists of two components: (i) the reversal of the gain or loss recognized in previous periods on equity securities sold and (ii) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.

15

(14) Fixed Maturity Securities in an Unrealized Loss Position

The following tables summarize all fixed maturity securities in an unrealized loss position at June 30, 2019 and December 31, 2018 by the length of time those securities have been continuously in an unrealized loss position:

	Less Than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
June 30, 2019
U.S. government and government agency	$	6,175	$	37	$	92,729	$	1,381	$	98,904	$	1,418
State and municipal	64,499		838		270,454		3,083		334,953		3,921
Mortgage-backed securities	23,049		112		334,887		5,584		357,936		5,696
Asset-backed securities	1,010,706		17,410		572,110		10,297		1,582,816		27,707
Corporate	139,627		1,095		328,409		12,549		468,036		13,644
Foreign government	140,589		18,942		73,967		4,417		214,556		23,359
Fixed maturity securities	$	1,384,645	$	38,434	$	1,672,556	$	37,311	$	3,057,201	$	75,745
December 31, 2018
U.S. government and government agency	$	195,359	$	933	$	130,815	$	3,977	$	326,174	$	4,910
State and municipal	701,700		6,874		744,905		17,738		1,446,605		24,612
Mortgage-backed securities	334,063		2,911		712,595		21,022		1,046,658		23,933
Asset-backed securities	1,687,665		28,965		342,855		4,722		2,030,520		33,687
Corporate	1,730,513		54,181		954,763		49,129		2,685,276		103,310
Foreign government	246,273		24,197		80,004		914		326,277		25,111
Fixed maturity securities	$	4,895,573	$	118,061	$	2,965,937	$	97,502	$	7,861,510	$	215,563

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at June 30, 2019 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Foreign government	12	$	114,714	$	22,719
Corporate	11	65,905		3,278
Asset-backed securities	7	10,412		1,344
Mortgage-backed securities	4	7,170		63
Total	34	$	198,201	$	27,404

For OTTI of fixed maturity securities that management does not intend to sell or to be required to sell, the portion of the decline in value that is considered to be due to credit factors is recognized in earnings, and the portion of the decline in value that is considered to be due to non-credit factors is recognized in other comprehensive income.

     The Company has evaluated its fixed maturity securities in an unrealized loss position and believes the unrealized losses are due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default under financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due and does not consider any of these securities to be OTTI.

(15) Fair Value Measurements

The Company’s fixed maturity available for sale securities, equity securities and its arbitrage trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:

Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

16

Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.

Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.

Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.

If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.

For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.

17

The following tables present the assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
June 30, 2019
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	777,070	$	—	$	777,070	$	—
State and municipal	3,747,823		—		3,747,823		—
Mortgage-backed securities	1,575,866		—		1,575,866		—
Asset-backed securities	2,701,785		—		2,701,760		25
Corporate	4,036,285		—		4,036,285		—
Foreign government	815,424		—		815,424		—
Total fixed maturity securities available for sale	13,654,253		—		13,654,228		25
Equity securities:
Common stocks	140,226		131,242		—		8,984
Preferred stocks	276,362		—		272,426		3,936
Total equity securities	416,588		131,242		272,426		12,920
Arbitrage trading account	533,442		424,030		83,206		26,206
Total	$	14,604,283	$	555,272	$	14,009,860	$	39,151
Liabilities:
Trading account securities sold but not yet purchased	$	159,349	$	144,420	$	213	$	14,716
December 31, 2018
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	702,240	$	—	$	702,240	$	—
State and municipal	3,872,598		—		3,872,598		—
Mortgage-backed securities	1,594,546		—		1,594,546		—
Asset-backed securities	2,438,747		—		2,438,648		99
Corporate	4,111,311		—		4,111,311		—
Foreign government	808,735		—		808,735		—
Total fixed maturity securities available for sale	13,528,177		—		13,528,078		99
Equity securities:
Common stocks	98,192		89,596		—		8,596
Preferred stocks	180,814		—		176,869		3,945
Total equity securities	279,006		89,596		176,869		12,541
Arbitrage trading account	452,548		353,335		81,905		17,308
Total	$	14,259,731	$	442,931	$	13,786,852	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	38,120	$	37,327	$	—	$	793

18

The following tables summarize changes in Level 3 assets and liabilities for the six months ended June 30, 2019 and for the year ended December 31, 2018:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Loss)		Impairments		Purchases		(Sales)			Paydowns / Maturities		Transfers In / (Out)		Ending Balance
Six Months Ended June 30, 2019
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	99	$	2		$	46	$	—	$	—	$	(122	)	$	—	$	—	$	25
Total	99		2			46		—		—		(122		)	—		—		25
Equity securities:
Common stocks	8,596		388			—		—		—		—			—		—		8,984
Preferred stocks	3,945		(9		)	—		—		—		—			—		—		3,936
Total	12,541		379			—		—		—		—			—		—		12,920
Arbitrage trading account	17,308		409			—		—		14,672		(21,072		)	—		14,889		26,206
Total	$	29,948	$	790		$	46	$	—	$	14,672	$	(21,194	)	$	—	$	14,889	$	39,151
Liabilities:
Trading account securities sold but not yet purchased	$	793	$	9,320		$	—	$	—	$	7,609	$	(3,006	)	$	—	$	—	$	14,716
Year Ended December 31, 2018
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	172	$	(2	)	$	46	$	—	$	—	$	(117	)	$	—	$	—	$	99
Total	172		(2		)	46		—		—		(117		)	—		—		99
Equity securities:
Common stocks	9,370		(548		)	—		—		—		(227		)	—		1		8,596
Preferred stocks	10,843		100			—		—				(6,998		)	—		—		3,945
Total	20,213		(448		)	—		—		—		(7,225		)	—		1		12,541
Arbitrage trading account	—		(6		)	—		—		11,523		(11		)	—		5,802		17,308
Total	$	20,385	$	(456	)	$	46	$	—	$	11,523	$	(7,353	)	$	—	$	5,803	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	(67	)	$	—	$	—	$	860	$	—		$	—	$	—	$	793

Transfers into Level 3 represent cases where a publicly traded price was no longer available for a particular investment.

19

(16) Reserves for Loss and Loss Expenses

The Company's reserves for losses and loss expenses are comprised of case reserves and incurred but not reported liabilities ("IBNR"). When a claim is reported, a case reserve is established for the estimated ultimate payment based upon known information about the claim. As more information about the claim becomes available over time, case reserves are adjusted up or down as appropriate. Reserves are also established on an aggregate basis to provide for IBNR liabilities and expected loss reserve development on reported claims.

Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each operating unit. These methods include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each operating unit.

The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions.

The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is priced and written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each operating unit. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are discounted to their estimated present value based upon such estimated payout patterns.

Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.

Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of businesses with short reporting lags than for lines of business with long reporting lags.

The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed.

20

The table below provides a reconciliation of the beginning and ending reserve balances:

	June 30,
(In thousands)	2019			2018
Net reserves at beginning of period	$	10,248,883		$	10,056,914
Net provision for losses and loss expenses:
Claims occurring during the current year (1)	1,980,138			1,916,140
Increase (decrease) in estimates for claims occurring in prior years (2) (3)	16,764			(246		)
Loss reserve discount accretion	20,577			20,962
Total	2,017,479			1,936,856
Net payments for claims:
Current year	548,589			316,567
Prior years	1,200,906			1,527,522
Total	1,749,495			1,844,089
Foreign currency translation	(2,228		)	(72,351		)
Net reserves at end of period	10,514,639			10,077,330
Ceded reserves at end of period	1,805,639			1,659,245
Gross reserves at end of period	$	12,320,278		$	11,736,575

_______________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $11 million and $13 million for the six months ended June 30, 2019 and 2018.

(2) The change in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years increased by $9 million and decreased by $6 million for the six months ended June 30, 2019 and 2018, respectively.

(3) For certain retrospectively rated insurance policies and reinsurance agreements, reserve development is offset by additional or return premiums. Favorable development, net of additional and return premiums, was $14 million and $19 million for the six months ended June 30, 2019 and 2018, respectively.

During the six months ended June 30, 2019, favorable prior year development (net of additional and return premiums) of $13.6 million included $17.2 million of favorable development for the Insurance segment, offset by $3.6 million of adverse development for the Reinsurance & Monoline Excess segment.

The overall favorable development for the Insurance segment was primarily attributable to favorable development on workers’ compensation business, partially offset by adverse development on other liability business, commercial auto liability business, and medical malpractice business. The favorable workers’ compensation development was spread across many accident years, including prior to 2009, but was most significant in accident years 2015 through 2018. The favorable workers’ compensation development reflects a continuation of the benign loss cost trends experienced during recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure). The adverse other liability development was mainly related to accident years 2014 through 2016. It was driven by a higher than expected number of large losses being reported in the period, including both general liability and professional liability losses. The adverse commercial auto liability development was primarily related to accident year 2018, and was driven by a higher than expected number of large losses. The adverse medical malpractice development was primarily related to accident years 2013 through 2016, and stemmed from a discontinued book of business at one of our profit centers.

The adverse development for the Reinsurance & Monoline Excess segment was mainly driven by U.S. casualty facultative business from accident years 2009 and prior related to construction projects.

During the six months ended June 30, 2018, favorable prior year development (net of additional and return premiums) of $19.3 million included $18.6 million of favorable development for the Insurance segment, and $0.7 million of favorable development for the Reinsurance & Monoline Excess segment. The favorable development for the Insurance segment was primarily attributable to workers’ compensation business. The favorable workers’ compensation development was spread across many accident years, including prior to 2008, but was most significant in accident years 2015 through 2017. The favorable workers’ compensation development reflects a continuation of the benign loss cost trends experienced in recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure).

21

(17) Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:

	June 30, 2019				December 31, 2018
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	13,732,800	$	13,746,972	$	13,606,812	$	13,619,620
Equity securities	416,588		416,588		279,006		279,006
Arbitrage trading account	533,442		533,442		452,548		452,548
Loans receivable	94,697		96,905		94,813		97,073
Cash and cash equivalents	1,258,174		1,258,174		817,602		817,602
Trading account receivables from brokers and clearing organizations	402,361		402,361		347,228		347,228
Liabilities:
Due to broker	39,230		39,230		20,144		20,144
Trading account securities sold but not yet purchased	159,349		159,349		38,120		38,120
Subordinated debentures	907,866		969,172		907,491		840,002
Senior notes and other debt	1,873,799		2,019,430		1,882,028		1,968,996

The estimated fair values of the Company’s fixed maturity securities, equity securities and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 15. The fair value of loans receivable are estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

(18) Reinsurance

The following is a summary of reinsurance financial information:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2019			2018			2019			2018
Written premiums:
Direct	$	1,883,032		$	1,785,266		$	3,712,847		$	3,572,501
Assumed	206,828			162,808			423,243			354,995
Ceded	(346,396		)	(323,970		)	(683,025		)	(638,054		)
Total net premiums written	$	1,743,464		$	1,624,104		$	3,453,065		$	3,289,442
Earned premiums:
Direct	$	1,773,437		$	1,705,277		$	3,497,047		$	3,379,827
Assumed	198,661			180,509			386,852			369,375
Ceded	(325,257		)	(304,733		)	(644,202		)	(600,741		)
Total net premiums earned	$	1,646,841		$	1,581,053		$	3,239,697		$	3,148,461
Ceded losses and loss expenses incurred	$	239,267		$	161,073		$	412,314		$	400,068
Ceded commissions earned	$	73,092		$	65,922		$	144,109		$	132,278

The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. The Company also cedes premiums to state assigned risk plans and captive insurance companies. Estimated amounts due from reinsurers are reported net of reserves for uncollectible reinsurance of $1 million as of both June 30, 2019 and December 31, 2018.

22

(19) Restricted Stock Units

Pursuant to its stock incentive plan, the Company may issue restricted stock units ("RSUs") to employees of the Company and its subsidiaries. The RSUs generally vest three to five years from the award date and are subject to other vesting and forfeiture provisions contained in the award agreement. RSUs are expensed pro-ratably over the vesting period. RSU expenses were $25 million and $18 million for the six months ended June 30, 2019 and 2018, respectively. A summary of RSUs issued in the six months ended June 30, 2019 and 2018 follows:

($ in thousands)	Units	Fair Value
2019	5,141	$	308
2018	19,538	$	963

(20) Litigation and Contingent Liabilities

In the ordinary course of business, the Company is subject to disputes, litigation and arbitration arising from its insurance and reinsurance businesses. These matters are generally related to insurance and reinsurance claims and are considered in the establishment of loss and loss expense reserves. In addition, the Company may also become involved in legal actions which seek extra-contractual damages, punitive damages or penalties, including claims alleging bad faith in handling of insurance claims. The Company expects its ultimate liability with respect to such matters will not be material to its financial condition. However, adverse outcomes on such matters are possible, from time to time, and could be material to the Company’s results of operations in any particular financial reporting period.

(21) Leases

As described in note 3, the Company prospectively adopted ASU 2016-02, Leases, for the quarter ended March 31, 2019, which requires lessees to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months on the balance sheet. All leases disclosed within this footnote are classified as operating leases. Recognized right-of-use asset and lease liability are reported within other assets and other liabilities, respectively, in the consolidated balance sheet. Lease expense is reported in other operating costs and expenses in the consolidated statement of income and accounted for on a straight-line basis over the lease term.

To determine the discount rate used to calculate present value of future minimum lease payments, the Company uses its incremental borrowing rate during the lease commencement period in line with the respective lease duration. In certain cases, the Company has the option to renew the lease. Lease renewal future payments are included in the present value of the future minimum lease payments when the Company determines it is reasonably certain to renew.

The main leases entered into by the Company are for office space used by the Company’s operating units across the world. Additionally, the Company, to a lesser extent, has equipment leases mainly for office equipment. Further information relating to operating lease expense and other operating lease information are as follows:

	For the Three Months Ended June 30, 2019		For the Six Months Ended June 30, 2019
(In thousands)
Leases:
Lease cost	$	10,680	$	22,235
Cash paid for amounts included in the measurement of lease liabilities reported in operating cash flows	$	11,132	$	22,789
Right-of-use assets obtained in exchange for new lease liabilities	$	2,918	$	7,884

($ in thousands)	June 30, 2019
Right-of-use assets	$	179,984
Lease liabilities	$	209,107
Weighted-average remaining lease term	6.6 years
Weighted-average discount rate	5.97		%

Contractual maturities of the Company’s future minimum lease payments are as follows:

23

(In thousands)	June 30, 2019
Contractual Maturities:
2019	$	24,117
2020	44,461
2021	40,681
2022	35,121
2023	31,556
Thereafter	77,578
Total undiscounted future minimum lease payments	253,514
Less: Discount impact	(44,407		)
Total lease liability	$	209,107

(22) Business Segments

The Company’s reportable segments include the following two business segments, plus a corporate segment:

• Insurance - predominantly commercial insurance business, including excess and surplus lines, admitted lines and specialty personal lines throughout the United States, as well as insurance business in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia and Australia.

• Reinsurance & Monoline Excess - reinsurance business on a facultative and treaty basis, primarily in the United States, the United Kingdom, Continental Europe, Australia, the Asia-Pacific Region and South Africa, as well as monoline excess business in the United States.

The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Income tax expense and benefits are calculated based upon the Company's overall effective tax rate.

Summary financial information about the Company's reporting segments is presented in the following tables. Income (loss) before income taxes by segment includes allocated investment income. Identifiable assets by segment are those assets used in or allocated to the operation of each segment.

24

	Revenues
(In thousands)	Earned Premiums (1)		Investment Income		Other		Total (2)		Pre-Tax Income (Loss)			Net Income (Loss) to Common Stockholders
Three months ended June 30, 2019
Insurance	$	1,475,184	$	132,403	$	13,687	$	1,621,274	$	225,871		$	179,241
Reinsurance & Monoline Excess	171,657		44,449		—		216,106		52,635			41,864
Corporate, other and eliminations (3)	—		11,481		100,949		112,430		(78,344		)	(62,519		)
Net realized and unrealized gains on investments	—		—		73,574		73,574		73,574			58,123
Total	$	1,646,841	$	188,333	$	188,210	$	2,023,384	$	273,736		$	216,709
Three months ended June 30, 2018
Insurance	$	1,415,579	$	94,542	$	18,707	$	1,528,828	$	163,181		$	128,693
Reinsurance & Monoline Excess	165,474		41,914		—		207,388		56,174			44,291
Corporate, other and eliminations (3)	—		17,321		87,748		105,069		(59,744		)	(47,917		)
Net realized and unrealized gains on investments	—		—		69,631		69,631		69,631			55,008
Total	$	1,581,053	$	153,777	$	176,086	$	1,910,916	$	229,242		$	180,075
Six months ended June 30, 2019
Insurance	$	2,902,218	$	232,444	$	26,931	$	3,161,593	$	410,387		$	325,234
Reinsurance & Monoline Excess	337,479		84,023		—		421,502		97,490			77,389
Corporate, other and eliminations (3)	—		30,120		204,965		235,085		(146,928		)	(117,551		)
Net realized and unrealized gains on investments	—		—		142,226		142,226		142,226			112,359
Total	$	3,239,697	$	346,587	$	374,122	$	3,960,406	$	503,175		$	397,431
Six Months Ended June 30, 2018
Insurance	$	2,806,868	$	208,040	$	37,675	$	3,052,583	$	362,109		$	286,426
Reinsurance & Monoline Excess	341,593		88,928		—		430,521		100,866			79,838
Corporate, other and eliminations (3)	—		31,327		169,637		200,964		(140,838		)	(113,087		)
Net realized and unrealized gains on investments	—		—		118,095		118,095		118,095			93,295
Total	$	3,148,461	$	328,295	$	325,407	$	3,802,163	$	440,232		$	346,472

_________________

(1)Certain amounts included in earned premiums of each segment are related to inter-segment transactions.

(2)Revenues for Insurance from foreign countries for the three months ended June 30, 2019 and 2018 were $179 million and $176 million, and for the six months ended June 30, 2019 and 2018 were $349 million and $359 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign countries for the three months ended June 30, 2019 and 2018 were $62 million and $55 million, and for the six months ended June 30, 2019 and 2018 were $121 million and $112 million, respectively.

(3) Corporate, other and eliminations represent corporate revenues and expenses that are not allocated to business segments.

Identifiable Assets

(In thousands)	June 30, 2019		December 31, 2018
Insurance	$	19,444,475	$	18,214,293
Reinsurance & Monoline Excess	4,573,446		4,371,151
Corporate, other and eliminations	2,469,982		2,310,533
Consolidated	$	26,487,903	$	24,895,977

25

Net premiums earned by major line of business are as follows:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
(In thousands)	2019		2018		2019		2018
Insurance:
Other liability	$	505,621	$	474,721	$	996,282	$	938,889
Workers’ compensation	330,510		336,996		657,186		661,974
Short-tail lines (1)	305,852		288,320		594,943		583,347
Commercial automobile	188,278		175,812		369,203		351,010
Professional liability	144,923		139,730		284,604		271,648
Total Insurance	1,475,184		1,415,579		2,902,218		2,806,868
Reinsurance & Monoline Excess:
Casualty reinsurance	95,109		86,841		185,939		177,411
Monoline excess (2)	39,400		40,429		78,381		81,477
Property reinsurance	37,148		38,204		73,159		82,705
Total Reinsurance & Monoline Excess	171,657		165,474		337,479		341,593
Total	$	1,646,841	$	1,581,053	$	3,239,697	$	3,148,461

______________

(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery and other lines.

(2) Monoline excess includes operations that solely retain risk on an excess basis.

26

SAFE HARBOR STATEMENT

This is a “Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995. Any forward-looking statements contained herein, including statements related to our outlook for the industry and for our performance for the year 2019 and beyond, are based upon the Company’s historical performance and on current plans, estimates and expectations. The inclusion of this forward-looking information should not be regarded as a representation by us or any other person that the future plans, estimates or expectations contemplated by us will be achieved. They are subject to various risks and uncertainties, including but not limited to: the cyclical nature of the property casualty industry; the impact of significant competition, including new alternative entrants to the industry; the long-tail and potentially volatile nature of the insurance and reinsurance business; product demand and pricing; claims development and the process of estimating reserves; investment risks, including those of our portfolio of fixed maturity securities and investments in equity securities, including investments in financial institutions, municipal bonds, mortgage-backed securities, loans receivable, investment funds, including real estate, merger arbitrage, energy related and private equity investments; the effects of emerging claim and coverage issues; the uncertain nature of damage theories and loss amounts; natural and man-made catastrophic losses, including as a result of terrorist activities; the impact of climate change, which may increase the frequency and severity of catastrophe events; general economic and market activities, including inflation, interest rates, and volatility in the credit and capital markets; the impact of the conditions in the financial markets and the global economy, and the potential effect of legislative, regulatory, accounting or other initiatives taken in response, on our results and financial condition; foreign currency and political risks (including those associated with the United Kingdom's withdrawal from the European Union, or "Brexit") relating to our international operations; our ability to attract and retain key personnel and qualified employees; continued availability of capital and financing; the success of our new ventures or acquisitions and the availability of other opportunities; the availability of reinsurance; our retention under the Terrorism Risk Insurance Program Reauthorization Act of 2015; the ability or willingness of our reinsurers to pay reinsurance recoverables owed to us; other legislative and regulatory developments, including those related to business practices in the insurance industry; credit risk related to our policyholders, independent agents and brokers; changes in the ratings assigned to us or our insurance company subsidiaries by rating agencies; the availability of dividends from our insurance company subsidiaries; potential difficulties with technology and/or cyber security issues; the effectiveness of our controls to ensure compliance with guidelines, policies and legal and regulatory standards; and other risks detailed from time to time in the Company’s filings with the Securities and Exchange Commission.

These risks and uncertainties could cause our actual results for the year 2019 and beyond to differ materially from those expressed in any forward-looking statement we make. Any projections of growth in our revenues would not necessarily result in commensurate levels of earnings. Our future financial performance is dependent upon factors discussed in our Annual Report on Form 10-K, elsewhere in this Form 10-Q and our other SEC filings. Forward-looking statements speak only as of the date on which they are made. Except to the extent required by applicable laws, the Company does not undertake any obligation to update or revise any forward-looking statement, whether as a result of new information, future developments or otherwise.

27

Item 2.     Management’s Discussion and Analysis of Financial Condition and Results of Operations

Overview

W. R. Berkley Corporation is an insurance holding company that is among the largest commercial lines writers in the United States and operates worldwide in two segments of the property and casualty business: Insurance and Reinsurance & Monoline Excess. Our decentralized structure provides us with the flexibility to respond quickly and efficiently to local or specific market conditions and to pursue specialty business niches. It also allows us to be closer to our customers in order to better understand their individual needs and risk characteristics. While providing our business units with certain operating autonomy, our structure allows us to capitalize on the benefits of economies of scale through centralized capital, investment, reinsurance, enterprise risk management, and actuarial, financial and corporate legal staff support. The Company’s primary sources of revenues and earnings are its insurance operations and its investments.

An important part of our strategy is to form new operating units to capitalize on various business opportunities. Over the years, the Company has formed numerous operating units that are focused on important parts of the economy in the U.S., including healthcare, cyber security, energy and agriculture, and on growing international markets, including the Asia-Pacific region, South America and Mexico.

The profitability of the Company’s insurance business is affected primarily by the adequacy of premium rates. The ultimate adequacy of premium rates is not known with certainty at the time an insurance policy is issued because premiums are determined before claims are reported. The ultimate adequacy of premium rates is affected mainly by the severity and frequency of claims, which are influenced by many factors, including natural and other disasters, regulatory measures and court decisions that define and change the extent of coverage and the effects of economic inflation on the amount of compensation for injuries or losses. General insurance prices are also influenced by available insurance capacity, i.e., the level of capital employed in the industry, and the industry’s willingness to deploy that capital.

The Company’s profitability is also affected by its investment income and investment gains. The Company’s invested assets are invested principally in fixed maturity securities. The return on fixed maturity securities is affected primarily by general interest rates, as well as the credit quality and duration of the securities. Returns available on fixed maturity investments have been at low levels for an extended period.

The Company also invests in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets. The Company's investments in investment funds and its other alternative investments have experienced, and the Company expects to continue to experience, greater fluctuations in investment income.

On April 2, 2019, a 3-for-2 common stock split was paid in the form of a stock dividend to holders of record as of March 14, 2019. Shares outstanding and per share amounts in this Form 10-Q reflect this 3-for-2 common stock split effected on April 2, 2019.

Commencing with the first quarter of 2019, the Company renamed the Reinsurance segment to Reinsurance & Monoline Excess, and reclassified the monoline excess business from the Insurance segment. The reclassified business includes operations that solely retain risk on an excess basis. Reclassifications have been made to the Company's 2018 financial information to conform with this presentation.

Critical Accounting Estimates

The following presents a discussion of accounting policies and estimates relating to reserves for losses and loss expenses, assumed premiums and other-than-temporary impairments of investments. Management believes these policies and estimates are the most critical to its operations and require the most difficult, subjective and complex judgments.

Reserves for Losses and Loss Expenses. To recognize liabilities for unpaid losses, either known or unknown, insurers establish reserves, which is a balance sheet account representing estimates of future amounts needed to pay claims and related expenses with respect to insured events which have occurred. Estimates and assumptions relating to reserves for losses and loss expenses are based on complex and subjective judgments, often including the interplay of specific uncertainties with related accounting and actuarial measurements. Such estimates are also susceptible to change as significant periods of time may elapse between the occurrence of an insured loss, the report of the loss to the insurer, the ultimate determination of the cost of the loss and the insurer’s payment of that loss.

In general, when a claim is reported, claims personnel establish a “case reserve” for the estimated amount of the ultimate payment based upon known information about the claim at that time. The estimate represents an informed judgment based on general reserving practices and reflects the experience and knowledge of the claims personnel regarding the nature

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and value of the specific type of claim. Reserves are also established on an aggregate basis to provide for losses incurred but not reported (“IBNR”) to the insurer, potential inadequacy of case reserves and the estimated expenses of settling claims, including legal and other fees and general expenses of administrating the claims adjustment process. Reserves are established based upon the then current legal interpretation of coverage provided.

In examining reserve adequacy, several factors are considered in estimating the ultimate economic value of losses. These factors include, among other things, historical data, legal developments, changes in social attitudes and economic conditions, including the effects of inflation. The actuarial process relies on the basic assumption that past experience, adjusted judgmentally for the effects of current developments and anticipated trends, is an appropriate basis for predicting future outcomes. Reserve amounts are based on management’s informed estimates and judgments using currently available data. As additional experience and other data become available and are reviewed, these estimates and judgments may be revised. This may result in reserve increases or decreases that would be reflected in our results in periods in which such estimates and assumptions are changed.

Reserves do not represent an exact calculation of liability. Rather, reserves represent an estimate of what management expects the ultimate settlement and claim administration will cost. While the methods for establishing reserves are well tested over time, some of the major assumptions about anticipated loss emergence patterns are subject to uncertainty. These estimates, which generally involve actuarial projections, are based on management’s assessment of facts and circumstances then known, as well as estimates of trends in claims severity and frequency, judicial theories of liability and other factors, including the actions of third parties which are beyond the Company’s control. These variables are affected by external and internal events, such as inflation and economic volatility, judicial and litigation trends, reinsurance coverage, legislative changes and claim handling and reserving practices, which make it more difficult to accurately predict claim costs. The inherent uncertainties of estimating reserves are greater for certain types of liabilities where long periods of time elapse before a definitive determination of liability is made. Because setting reserves is inherently uncertain, the Company cannot provide assurance that its current reserves will prove adequate in light of subsequent events.

Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each operating unit. These methods include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. For example, the paid loss and incurred loss development methods rely on historical paid and incurred loss data. For new lines of business, where there is insufficient history of paid and incurred claims data, or in circumstances where there have been significant changes in claim practices, the paid and incurred loss development methods would be less credible than other actuarial methods. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” and in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each operating unit.

The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions. Examples of changes in terms and conditions that can have a significant impact on reserve levels are the use of aggregate policy limits, the expansion of coverage exclusions, whether or not defense costs are within policy limits, and changes in deductibles and attachment points.

The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each operating unit. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are discounted to their estimated present value based upon such estimated payout patterns. Management believes the estimates and assumptions it makes in the reserving process provide the best estimate of the ultimate cost of settling claims and related

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expenses with respect to insured events which have occurred; however, different assumptions and variables could lead to significantly different reserve estimates.

Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.

Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of businesses with short reporting lags than for lines of business with long reporting lags.

The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed. If the actual level of loss frequency and severity are higher or lower than expected, the ultimate losses will be different than management’s estimate. The following table reflects the impact of changes (which could be favorable or unfavorable) in frequency and severity, relative to our assumptions, on our loss estimate for claims occurring in 2018:

(In thousands)	Frequency (+/-)
Severity (+/-)	1%		5%		10%
1%	$	78,922	$	237,553	$	435,840
5%	237,553		402,465		608,606
10%	435,840		608,606		824,563

Our net reserves for losses and loss expenses of approximately $10.5 billion as of June 30, 2019 relate to multiple accident years. Therefore, the impact of changes in frequency or severity for more than one accident year could be higher or lower than the amounts reflected above. The impact of such changes would likely be manifested gradually over the course of many years, as the magnitude of the changes became evident.

Approximately $2.5 billion, or 24%, of the Company’s net loss reserves as of June 30, 2019 relate to the Reinsurance & Monoline Excess segment. There is a higher degree of uncertainty and greater variability regarding estimates of excess workers' compensation and assumed reinsurance loss reserves. In the case of excess workers’ compensation, our policies generally attach at $1 million or higher. The claims which reach our layer therefore tend to involve the most serious injuries and many remain open for the lifetime of the claimant, which extends the claim settlement tail. These claims also occur less frequently but tend to be larger than primary claims, which increases claim variability. In the case of assumed reinsurance our loss reserve estimates are based, in part, upon information received from ceding companies. If information received from ceding companies is not timely or correct, the Company’s estimate of ultimate losses may not be accurate. Furthermore, due to delayed reporting of claim information by ceding companies, the claim settlement tail for assumed reinsurance is also extended. Management considers the impact of delayed reporting and the extended tail in its selection of loss development factors for these lines of business.

Information received from ceding companies is used to set initial expected loss ratios, to establish case reserves and to estimate reserves for incurred but not reported losses on assumed reinsurance business. This information, which is generally provided through reinsurance intermediaries, is gathered through the underwriting process and from periodic claim reports and other correspondence with ceding companies. The Company performs underwriting and claim audits of selected ceding companies to determine the accuracy and completeness of information provided to the Company. The information received from the ceding companies is supplemented by the Company’s own loss development experience with similar lines of business as well as industry loss trends and loss development benchmarks.

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Following is a summary of the Company’s reserves for losses and loss expenses by business segment:

(In thousands)	June 30, 2019		December 31, 2018
Insurance	$	8,007,810	$	7,727,447
Reinsurance & Monoline Excess	2,506,829		2,521,436
Net reserves for losses and loss expenses	10,514,639		10,248,883
Ceded reserves for losses and loss expenses	1,805,639		1,717,565
Gross reserves for losses and loss expenses	$	12,320,278	$	11,966,448

Following is a summary of the Company’s net reserves for losses and loss expenses by major line of business:

(In thousands)	Reported Case Reserves		Incurred But Not Reported		Total
June 30, 2019
Other liability	$	1,351,833	$	2,423,630	$	3,775,463
Workers’ compensation (1)	948,968		975,454		1,924,422
Professional liability	354,166		687,989		1,042,155
Commercial automobile	382,688		307,393		690,081
Short-tail lines (2)	289,208		286,481		575,689
Total Insurance	3,326,863		4,680,947		8,007,810
Reinsurance & Monoline Excess (1) (3)	1,489,128		1,017,701		2,506,829
Total	$	4,815,991	$	5,698,648	$	10,514,639
December 31, 2018
Other liability	$	1,307,068	$	2,329,659	$	3,636,727
Workers’ compensation (1)	962,664		955,711		1,918,375
Professional liability	306,018		659,596		965,614
Commercial automobile	365,253		290,217		655,470
Short-tail lines (2)	294,122		257,139		551,261
Total Insurance	3,235,125		4,492,322		7,727,447
Reinsurance & Monoline Excess (1) (3)	1,479,604		1,041,832		2,521,436
Total	$	4,714,729	$	5,534,154	$	10,248,883

___________

(1) Reserves for workers’ compensation and Reinsurance & Monoline Excess are net of an aggregate net discount of $546 million and $563 million as of June 30, 2019 and December 31, 2018, respectively.

(2) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery and other lines.

(3) Reinsurance & Monoline Excess includes property and casualty reinsurance, as well as operations that solely retain risk on an excess basis.

The Company evaluates reserves for losses and loss adjustment expenses on a quarterly basis. Changes in estimates of prior year losses are reported when such changes are made. The changes in prior year loss reserve estimates are generally the result of ongoing analysis of recent loss development trends. Original estimates are increased or decreased as additional information becomes known regarding individual claims and aggregate claim trends.

Certain of the Company's insurance and reinsurance contracts are retrospectively rated, whereby the Company collects more or less premiums based on the level of loss activity. For those contracts, changes in loss and loss adjustment expenses for prior years may be fully or partially offset by additional or return premiums.

Net prior year development (i.e., the sum of prior year reserve changes and prior year earned premiums changes) for the six months ended June 30, 2019 and 2018 are as follows:

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(In thousands)	2019			2018
Net (increase) decrease in prior year loss reserves	$	(16,764	)	$	246
Increase in prior year earned premiums	30,323			19,102
Net favorable prior year development	$	13,559		$	19,348

During the six months ended June 30, 2019, favorable prior year development (net of additional and return premiums) of $13.6 million included $17.2 million of favorable development for the Insurance segment, offset by $3.6 million of adverse development for the Reinsurance & Monoline Excess segment.

The overall favorable development for the Insurance segment was primarily attributable to favorable development on workers’ compensation business, partially offset by adverse development on other liability business, commercial auto liability business, and medical malpractice business. The favorable workers’ compensation development was spread across many accident years, including prior to 2009, but was most significant in accident years 2015 through 2018. The favorable workers’ compensation development reflects a continuation of the benign loss cost trends experienced during recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure). The adverse other liability development was mainly related to accident years 2014 through 2016. It was driven by a higher than expected number of large losses being reported in the period, including both general liability and professional liability losses. The adverse commercial auto liability development was primarily related to accident year 2018, and was driven by a higher than expected number of large losses. The adverse medical malpractice development was primarily related to accident years 2013 through 2016, and stemmed from a discontinued book of business at one of our profit centers.

The adverse development for the Reinsurance & Monoline Excess segment was mainly driven by U.S. casualty facultative business from accident years 2009 and prior related to construction projects.

During the six months ended June 30, 2018, favorable prior year development (net of additional and return premiums) of $19.3 million included $18.6 million of favorable development for the Insurance segment, and $0.7 million of favorable development for the Reinsurance & Monoline Excess segment. The favorable development for the Insurance segment was primarily attributable to workers’ compensation business. The favorable workers’ compensation development was spread across many accident years, including prior to 2008, but was most significant in accident years 2015 through 2017. The favorable workers’ compensation development reflects a continuation of the benign loss cost trends experienced in recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure).

Reserve Discount. The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,762 million and $1,793 million at June 30, 2019 and December 31, 2018, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $546 million and $563 million at June 30, 2019 and December 31, 2018, respectively. At June 30, 2019, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.7%.

Substantially all of the workers’ compensation discount (97% of total discounted reserves at June 30, 2019) relates to excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.

The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at June 30, 2019), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates permitted by the Department of Insurance of the State of Delaware.

Assumed Reinsurance Premiums. The Company estimates the amount of assumed reinsurance premiums that it will receive under treaty reinsurance agreements at the inception of the contracts. These premium estimates are revised as the actual amount of assumed premiums is reported to the Company by the ceding companies. As estimates of assumed premiums are made or revised, the related amount of earned premiums, commissions and incurred losses associated with those premiums are recorded. Estimated assumed premiums receivable were approximately $37 million at June 30, 2019 and $41 million at December 31, 2018. The assumed premium estimates are based upon terms set forth in reinsurance agreements, information received from ceding companies during the underwriting and negotiation of agreements, reports received from ceding

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companies and discussions and correspondence with reinsurance intermediaries. The Company also considers its own view of market conditions, economic trends and experience with similar lines of business. These premium estimates represent management’s best estimate of the ultimate amount of premiums to be received under its assumed reinsurance agreements.

Other-Than-Temporary Impairments (OTTI) of Investments. The cost of securities is adjusted where appropriate to include a provision for decline in value which is considered to be other-than-temporary. An other-than-temporary decline is considered to occur in investments where there has been a sustained reduction in fair value and where the Company does not expect the fair value to recover prior to the time of sale or maturity.

The Company classifies its fixed maturity securities by credit rating, primarily based on ratings assigned by credit rating agencies. For purposes of classifying securities with different ratings, the Company uses the average of the credit ratings assigned, unless in limited situations the Company’s own analysis indicates an internal rating is more appropriate. Securities that are not rated by a rating agency are evaluated and classified by the Company on a case-by-case basis.

Fixed Maturity Securities – For securities that we intend to sell or, more likely than not, would be required to sell, a decline in value below amortized cost is considered to be OTTI. The amount of OTTI is equal to the difference between amortized cost and fair value at the balance sheet date. For securities that we do not intend to sell or expect to be required to sell, a decline in value below amortized cost is considered to be an OTTI if we do not expect to recover the entire amortized cost basis of a security (i.e., the present value of cash flows expected to be collected is less than the amortized cost basis of the security).

The portion of the decline in value considered to be a credit loss (i.e., the difference between the present value of cash flows expected to be collected and the amortized cost basis of the security) is recognized in earnings. The portion of the decline in value not considered to be a credit loss (i.e., the difference in the present value of cash flows expected to be collected and the fair value of the security) is recognized in other comprehensive income.

Impairment assessments for structured securities, including mortgage-backed securities and asset-backed securities, collateralized debt obligations and corporate debt, are generally evaluated based on the performance of the underlying collateral under various economic and default scenarios that may involve subjective judgments and estimates by management. Modeling these securities involves various factors, such as projected default rates, the nature and realizable value of the collateral, if any, the ability of the issuer to make scheduled payments, historical performance and other relevant economic and performance factors. If an OTTI determination is made, a discounted cash flow analysis is used to ascertain the amount of the credit impairment.

The following table provides a summary of fixed maturity securities in an unrealized loss position as of June 30, 2019:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Unrealized loss less than 20% of amortized cost	464	$	3,042,808	$	67,954
Unrealized loss of 20% or greater of amortized cost:
Less than twelve months	6	4,520		3,044
Twelve months and longer	6	9,873		4,747
Total	476	$	3,057,201	$	75,745

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at June 30, 2019 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Foreign government	12	$	114,714	$	22,719
Corporate	11	65,905		3,278
Asset-backed securities	7	10,412		1,344
Mortgage-backed securities	4	7,170		63
Total	34	$	198,201	$	27,404

The Company has evaluated its fixed maturity securities in an unrealized loss position and believes the unrealized loss is due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default under financial covenants. Based on its assessment of these issuers, the Company expects them to

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continue to meet their contractual payment obligations as they become due and does not consider any of these securities to be OTTI.

Loans Receivable – The Company monitors the performance of its loans receivable, including current market conditions for each loan and the ability to collect principal and interest. For loans where the Company determines it is probable that the contractual terms will not be met, an analysis is performed and a valuation reserve is established, if necessary, with a charge to earnings. Loans receivable are reported net of a valuation reserve of $2 million and $3 million as of June 30, 2019 and December 31, 2018, respectively.

The Company monitors the performance of its loans receivable and assesses the ability of each borrower to pay principal and interest based upon loan structure, underlying property values, cash flow and related financial and operating performance of the property and market conditions. Loans receivable with a potential for default are further assessed using discounted cash flow analysis and comparable cost and sales methodologies, if appropriate.

Fair Value Measurements. The Company’s fixed maturity available for sale securities, equity securities, and its arbitrage trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for similar assets in active markets. Level 3 inputs are unobservable inputs for the asset or liability. Unobservable inputs may only be used to measure fair value to the extent that observable inputs are not available. The fair value of the vast majority of the Company’s portfolio is based on observable data (other than quoted prices) and, accordingly, is classified as Level 2.

In classifying particular financial securities in the fair value hierarchy, the Company uses its judgment to determine whether the market for a security is active and whether significant pricing inputs are observable. The Company determines the existence of an active market by assessing whether transactions occur with sufficient frequency and volume to provide reliable pricing information. The Company determines whether inputs are observable based on the use of such information by pricing services and external investment managers, the uninterrupted availability of such inputs, the need to make significant adjustments to such inputs and the volatility of such inputs over time. If the market for a security is determined to be inactive or if significant inputs used to price a security are determined to be unobservable, the security is categorized in Level 3 of the fair value hierarchy.

Because many fixed maturity securities do not trade on a daily basis, the Company utilizes pricing models and processes which may include benchmark curves, benchmarking of like securities, sector groupings and matrix pricing. Market inputs used to evaluate securities include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data. Quoted prices are often unavailable for recently issued securities that are infrequently traded or securities that are only traded in private transactions. For publicly traded securities for which quoted prices are unavailable, the Company determines fair value based on independent broker quotations and other observable market data. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial data, projections and business developments of the issuer and other relevant information.

The following is a summary of pricing sources for the Company's fixed maturity securities available for sale as of June 30, 2019:

($ in thousands)	Carrying Value		Percent of Total
Pricing source:
Independent pricing services	$	13,472,380	98.7	%
Syndicate manager	35,945		0.3
Directly by the Company based on:
Observable data	145,903		1.0
Cash flow model	25		—
Total	$	13,654,253	100.0	%

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Independent pricing services – Substantially all of the Company’s fixed maturity securities available for sale were priced by independent pricing services (generally one U.S. pricing service plus additional pricing services with respect to a limited number of foreign securities held by the Company). The prices provided by the independent pricing services are generally based on observable market data in active markets (e.g., broker quotes and prices observed for comparable securities). The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness based upon current trading levels for similar securities. If the prices appear unusual to the Company, they are re-examined and the value is either confirmed or revised. In addition, the Company periodically performs independent price tests of a sample of securities to ensure proper valuation and to verify our understanding of how securities are priced. As of June 30, 2019, the Company did not make any adjustments to the prices provided by the pricing services. Based upon the Company’s review of the methodologies used by the independent pricing services, these securities were classified as Level 2.

Syndicate manager – The Company has a 15% participation in a Lloyd’s syndicate, and the Company’s share of the securities owned by the syndicate is priced by the syndicate’s manager. The majority of the securities are liquid, short duration fixed maturity securities. The Company reviews the syndicate manager’s pricing methodology and audited financial statements and holds discussions with the syndicate manager as necessary to confirm its understanding and agreement with security prices. Based upon the Company’s review of the methodologies used by the syndicate manager, these securities were classified as Level 2.

Observable data – If independent pricing is not available, the Company prices the securities directly. Prices are based on observable market data where available, including current trading levels for similar securities and non-binding quotations from brokers. The Company generally requests two or more quotes. If more than one quote is received, the Company sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes obtained from brokers. Since these securities were priced based on observable data, they were classified as Level 2.

Cash flow model – If the above methodologies are not available, the Company prices securities using a discounted cash flow model based upon assumptions as to prevailing credit spreads, interest rates and interest rate volatility, time to maturity and subordination levels. Discount rates are adjusted to reflect illiquidity where appropriate. These securities were classified as Level 3.

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Results of Operations for the Six Months Ended June 30, 2019 and 2018

Business Segment Results

Following is a summary of gross and net premiums written, net premiums earned, loss ratios (losses and loss expenses incurred expressed as a percentage of premiums earned), expense ratios (underwriting expenses expressed as a percentage of premiums earned) and GAAP combined ratios (sum of loss ratio and expense ratio) for each of our business segments for the six months ended June 30, 2019 and 2018. The GAAP combined ratio represents a measure of underwriting profitability, excluding investment income. A GAAP combined ratio in excess of 100 indicates an underwriting loss; a number below 100 indicates an underwriting profit.

($ in thousands)	2019			2018
Insurance:
Gross premiums written	$	3,715,850		$	3,558,247
Net premiums written	3,071,964			2,964,676
Net premiums earned	2,902,218			2,806,868
Loss ratio	62.5		%	61.7		%
Expense ratio	31.4		%	32.9		%
GAAP combined ratio	93.9		%	94.6		%
Reinsurance & Monoline Excess:
Gross premiums written	$	420,240		$	369,248
Net premiums written	381,101			324,766
Net premiums earned	337,479			341,593
Loss ratio	60.0		%	60.3		%
Expense ratio	36.0		%	36.2		%
GAAP combined ratio	96.0		%	96.5		%
Consolidated:
Gross premiums written	$	4,136,090		$	3,927,495
Net premiums written	3,453,065			3,289,442
Net premiums earned	3,239,697			3,148,461
Loss ratio	62.2		%	61.5		%
Expense ratio	31.9		%	33.3		%
GAAP combined ratio	94.1		%	94.8		%

Net Income to Common Stockholders. The following table presents the Company’s net income to common stockholders and net income per diluted share for the six months ended June 30, 2019 and 2018:

(In thousands, except per share data)	2019		2018
Net income to common stockholders	$	397,431	$	346,472
Weighted average diluted shares	192,804		192,284
Net income per diluted share	$	2.06	$	1.80

The Company reported net income to common stockholders of $397 million in 2019 compared to $346 million in 2018. The 15% increase in net income was primarily due to an after-tax increase in underwriting income of $20 million, an after-tax increase in net investment gains of $19 million, an after-tax increase of $14 million in net investment income, an after-tax increase of $2 million in other income, an after-tax increase in foreign currency gains of $1 million, and a decrease of $1 million in tax expense, partially offset by an after-tax increase in corporate expenses of $4 million and an after-tax increase in interest expense of $4 million. The number of weighted average diluted shares remained relatively unchanged for the six months ended June 30, 2019 and 2018.

Premiums. Gross premiums written were $4,136 million in 2019, an increase of 5% from $3,927 million in 2018. The increase was due to a $158 million increase in the Insurance segment and a $51 million increase in the Reinsurance & Monoline Excess segment. Approximately 75.5% of policies expiring in 2019 were renewed, and 75.9% of policies expiring in 2018 were renewed.

Average renewal premium rates for insurance and facultative reinsurance increased 4.1% in 2019 when adjusted for changes in exposures, and increased 5.9% excluding workers' compensation.

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A summary of gross premiums written in 2019 compared with 2018 by line of business within each business segment follows:

• Insurance - gross premiums increased 4% to $3,716 million in 2019 from $3,558 million in 2018. Gross premiums increased $101 million (9%) for other liability, $69 million (17%) for professional liability, $31 million (4%) for short-tail lines and $18 million (4%) for commercial auto, and decreased $61 million (8%) for workers' compensation.

• Reinsurance & Monoline Excess - gross premiums increased 14% to $420 million in 2019 from $369 million in 2018. Gross premiums increased $41 million (23%) for casualty reinsurance, $8 million (9%) for property reinsurance and $2 million (2%) for monoline excess.

Net premiums written were $3,453 million in 2019, an increase of 5% from $3,289 million in 2018. Ceded reinsurance premiums as a percentage of gross written premiums were 17% in 2019 and 16% in 2018.

Premiums earned increased 3% to $3,240 million in 2019 from $3,148 million in 2018. Insurance premiums (including the impact of rate changes) are generally earned evenly over the policy term, and accordingly, recent rate increases will be earned over the upcoming quarters. Premiums earned in 2019 are related to business written during both 2019 and 2018. Audit premiums were $100 million in 2019 compared with $98 million in 2018.

Net Investment Income. Following is a summary of net investment income for the six months ended June 30, 2019 and 2018:

	Amount						Average Annualized Yield
($ in thousands)	2019			2018			2019		2018
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	261,022		$	252,911		3.5	%	3.5	%
Investment funds	58,251			53,070			8.4		8.9
Arbitrage trading account	17,784			13,524			8.5		4.1
Real estate	9,481			9,742			0.9		1.1
Equity securities	2,591			1,205			2.1		1.1
Gross investment income	349,129			330,452			3.7		3.6
Investment expenses	(2,542		)	(2,157		)	—		—
Total	$	346,587		$	328,295		3.6	%	3.6	%

Net investment income increased 6% to $347 million in 2019 from $328 million in 2018 due primarily to a $8 million increase in income from fixed maturity securities mainly driven by growth in the fixed maturity security portfolio, a $5 million increase in income from investment funds, a $4 million increase from the arbitrage trading account, and a $2 million increase from equity securities. The Company has maintained a shortened duration of its fixed maturity security portfolio. This has reduced the potential impact of mark-to-market on the portfolio and positioned the Company to react quickly to changes in the current environment. Average invested assets, at cost (including cash and cash equivalents), were $19.0 billion in 2019 and $18.1 billion in 2018.

Insurance Service Fees. The Company earns fees from an insurance distribution business, a third-party administrator and as a servicing carrier of workers' compensation assigned risk plans for certain states. Insurance service fees decreased to $48 million in 2019 from $60 million in 2018. The decrease is primarily due to the sale of a third party administration business in third quarter of 2018.

Net Realized and Unrealized Gains on Investments. The Company buys and sells securities and other investment assets on a regular basis in order to maximize its total return on investments. Decisions to sell securities and other investment assets are based on management’s view of the underlying fundamentals of specific investments as well as management’s expectations regarding interest rates, credit spreads, currency values and general economic conditions. Net realized and unrealized gains on investments were $142 million in 2019 compared with $118 million in 2018. The gains of $142 million in 2019 reflect net realized gains on investment sales of $31 million and an increase in unrealized gains on equity securities of $111 million.

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Revenues from Non-Insurance Businesses. Revenues from non-insurance businesses were derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions and aviation-related businesses that provide services to aviation markets, including (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenues from non-insurance businesses were $181 million in 2019 and $147 million in 2018. The increase mainly relates to growth in revenues from the aviation-related businesses and the purchase of a promotional merchandise business in the second half of 2018.

Losses and Loss Expenses. Losses and loss expenses increased to $2,017 million in 2019 from $1,937 million in 2018. The consolidated loss ratio was 62.2% in 2019 and 61.5% in 2018. Catastrophe losses, net of reinsurance recoveries and reinstatement premiums, were $38 million in 2019 and $21 million in 2018. Favorable prior year reserve development (net of premium offsets) was $14 million in 2019 and $19 million in 2018. The loss ratio excluding catastrophe losses and prior year reserve development was 61.5% in 2019 and 61.4% in 2018.

A summary of loss ratios in 2019 compared with 2018 by business segment follows:

• Insurance - The loss ratio was 62.5% in 2019 and 61.7% in 2018. Catastrophe losses were $38 million in 2019 compared with $20 million in 2018. Favorable prior year reserve development was $17 million in 2019 and $26 million in 2018. The loss ratio excluding catastrophe losses and prior year reserve development increased 0.4 points to 61.8% in 2019 from 61.4% in 2018.

• Reinsurance & Monoline Excess - The loss ratio was 60.0% in 2019 and 60.3% in 2018. Catastrophe losses were $0.1 million in 2019 compared with $1 million in 2018. Adverse prior year reserve development was $3 million in 2019 and $7 million in 2018. The loss ratio excluding catastrophe losses and prior year reserve development decreased 2.5 points to 58.9% in 2019 from 61.4% in 2018.

Other Operating Costs and Expenses. Following is a summary of other operating costs and expenses:

($ in thousands)	2019			2018
Policy acquisition and insurance operating expenses	$	1,031,951		$	1,047,093
Insurance service expenses	51,343			63,702
Net foreign currency gains	(6,494		)	(4,767		)
Other costs and expenses	103,116			97,553
Total	$	1,179,916		$	1,203,581

Policy acquisition and insurance operating expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Policy acquisition and insurance operating expenses decreased 1% and net premiums earned increased 3% from 2018. The expense ratio (underwriting expenses expressed as a percentage of premiums earned) was 31.9% in 2019 and 33.3% in 2018. The improvement is primarily attributable to higher net premiums earned and lower expenses.

Service expenses, which represent the costs associated with the fee-based businesses, decreased to $51 million in 2019 from $64 million in 2018. The decrease is primarily due to the sale of a third party administration business in third quarter of 2018.

Net foreign currency (gains) losses result from transactions denominated in a currency other than a company's operating functional currency. Net foreign currency gains were $6 million in 2019 compared to gains of $5 million in 2018, mainly resulting from the continued strengthening of the U.S. dollar in relation to the Argentine Peso.

Other costs and expenses represent general and administrative expenses of the parent company and other expenses not allocated to business segments, including the cost of certain long-term incentive plans and new business ventures. Other costs and expenses increased to $103 million in 2019 from $98 million in 2018, primarily due to non-recurring performance-based compensation costs.

Expenses from Non-Insurance Businesses. Expenses from non-insurance businesses represent costs associated with businesses engaged in the distribution of promotional merchandise, world-wide textile solutions and aviation-related businesses that include (i) cost of goods sold related to aircraft and products sold and services provided, and (ii) general and administrative expenses. Expenses from non-insurance businesses were $178 million in 2019 compared to $145 million in 2018. The increase mainly relates to expenses from a business purchased in the second half of 2018.

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Interest Expense. Interest expense was $81 million in 2019 compared with $77 million in 2018. In March 2018, the Company issued $175 million aggregate principal amount of 5.70% subordinated debentures due 2058, and in April 2018, the Company issued another $10 million principal amount of such debentures. Additionally in 2018, the Company issued subsidiary debt of $116 million, which was primarily attributable to a non-recourse mortgage loan on a real estate property in Florida.

Income Taxes. The effective income tax rate was 20.7% in 2019 and 20.9% in 2018. The effective income tax rate differs from the federal income tax rate of 21% primarily because of tax-exempt income and tax on income from foreign jurisdictions with different tax rates.

The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $89 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. In the future, if such earnings were distributed the Company projects that the incremental tax, if any, will be immaterial.

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Results of Operations for the Three Months Ended June 30, 2019 and 2018

Business Segment Results

Following is a summary of gross and net premiums written, net premiums earned, loss ratios (losses and loss expenses incurred expressed as a percentage of premiums earned), expense ratios (underwriting expenses expressed as a percentage of premiums earned) and GAAP combined ratios (sum of loss ratio and expense ratio) for each of our business segments for the three months ended June 30, 2019 and 2018. The GAAP combined ratio represents a measure of underwriting profitability, excluding investment income. A GAAP combined ratio in excess of 100 indicates an underwriting loss; a number below 100 indicates an underwriting profit.

($ in thousands)	2019			2018
Insurance:
Gross premiums written	$	1,905,367		$	1,798,074
Net premiums written	1,574,585			1,491,432
Net premiums earned	1,475,184			1,415,579
Loss ratio	62.9		%	62.4		%
Expense ratio	30.9		%	32.9		%
GAAP combined ratio	93.8		%	95.3		%
Reinsurance & Monoline Excess:
Gross premiums written	$	184,494		$	150,000
Net premiums written	168,879			132,672
Net premiums earned	171,657			165,474
Loss ratio	59.2		%	54.6		%
Expense ratio	36.0		%	36.8		%
GAAP combined ratio	95.2		%	91.4		%
Consolidated:
Gross premiums written	$	2,089,861		$	1,948,074
Net premiums written	1,743,464			1,624,104
Net premiums earned	1,646,841			1,581,053
Loss ratio	62.4		%	61.6		%
Expense ratio	31.5		%	33.3		%
GAAP combined ratio	93.9		%	94.9		%

Net Income to Common Stockholders. The following table presents the Company’s net income to common stockholders and net income per diluted share for the three months ended June 30, 2019 and 2018:

(In thousands, except per share data)	2019		2018
Net income to common stockholders	$	216,709	$	180,075
Weighted average diluted shares	193,059		192,509
Net income per diluted share	$	1.12	$	0.93

The Company reported net income to common stockholders of $217 million in 2019 compared to $180 million in 2018. The 20% increase in net income was primarily due to an after-tax increase in net investment income of $27 million mainly due to investment funds, an after-tax increase in underwriting income of $15 million, an after-tax decrease in corporate expenses of $5 million, an after-tax increase in net investment gains of $3 million, an after-tax increase in other income of $2 million and a decrease in tax expense of $2 million, partially offset by an after-tax increase in foreign currency losses of $15 million, an after-tax decrease in insurance service fee income of $2 million and an after-tax increase in interest expense of $1 million. The number of weighted average diluted shares remained relatively unchanged for the three months ended June 30, 2019 and 2018.

Premiums. Gross premiums written were $2,090 million in 2019, an increase of 7% from $1,948 million in 2018. The increase was due to a $107 million increase in the Insurance segment and a $35 million increase in the Reinsurance & Monoline Excess segment. Approximately 75.5% of policies expiring in 2019 were renewed, and 76.6% of policies expiring in 2018 were renewed.

Average renewal premium rates for insurance and facultative reinsurance increased 3.5% in 2019 when adjusted for changes in exposures, and increased 5.3% excluding workers' compensation.

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A summary of gross premiums written in 2019 compared with 2018 by line of business within each business segment follows:

• Insurance - gross premiums increased 6% to $1,905 million in 2019 from $1,798 million in 2018. Gross premiums increased $59 million (10%) for other liability, $50 million (25%) for professional liability, $24 million (6%) for short-tail lines, and $15 million (8%) for commercial auto, and decreased $41 million (11%) for workers' compensation.

• Reinsurance & Monoline Excess - gross premiums increased 23% to $184 million in 2019 from $150 million in 2018. Gross premiums increased $23 million (26%) for casualty reinsurance, $9 million (24%) for property reinsurance and $2 million (10%) for monoline excess.

Net premiums written were $1,743 million in 2019, an increase of 7% from $1,624 million in 2018. Ceded reinsurance premiums as a percentage of gross written premiums were 17% in both 2019 and 2018.

Premiums earned increased 4% to $1,647 million in 2019 from $1,581 million in 2018. Insurance premiums (including the impact of rate changes) are generally earned evenly over the policy term, and accordingly, recent rate increases will be earned over the upcoming quarters. Premiums earned in 2019 are related to business written during both 2019 and 2018. Audit premiums were $58 million in 2019 compared with $49 million in 2018.

Net Investment Income. Following is a summary of net investment income for the three months ended June 30, 2019 and 2018:

	Amount						Average Annualized Yield
($ in thousands)	2019			2018			2019		2018
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	128,903		$	129,665		3.4	%	3.6	%
Investment funds	46,840			12,716			13.4		4.2
Arbitrage trading account	7,199			8,333			7.0		5.0
Real estate	5,174			3,174			1.0		0.7
Equity securities	1,303			559			2.1		1.0
Gross investment income	189,419			154,447			4.0		3.4
Investment expenses	(1,086		)	(670		)	—		—
Total	$	188,333		$	153,777		3.9	%	3.4	%

Net investment income increased 22% to $188 million in 2019 from $154 million in 2018 due primarily to a $34 million increase in income from investment funds, a $2 million increase in real estate and $1 million increase in equity securities, partially offset by a $1 million decrease in income from fixed maturity securities and a $1 million decrease in arbitrage trading account. The Company has maintained a shortened duration of its fixed maturity security portfolio. This has reduced the potential impact of mark-to-market on the portfolio and positioned the Company to react quickly to changes in the current environment. Average invested assets, at cost (including cash and cash equivalents), were $19.1 billion in 2019 and $18.2 billion in 2018.

Insurance Service Fees. The Company earns fees from an insurance distribution business, a third-party administrator and as a servicing carrier of workers' compensation assigned risk plans for certain states. Insurance service fees decreased to $22 million in 2019 from $30 million in 2018. The decrease is primarily due to the sale of a third party administration business in third quarter of 2018.

Net Realized and Unrealized Gains on Investments. The Company buys and sells securities and other investment assets on a regular basis in order to maximize its total return on investments. Decisions to sell securities and other investment assets are based on management’s view of the underlying fundamentals of specific investments as well as management’s expectations regarding interest rates, credit spreads, currency values and general economic conditions. Net realized and unrealized gains on investments were $74 million in 2019 compared with $70 million in 2018. The gains of $74 million in 2019 reflect net realized gains on investment sales of $4 million and an increase in unrealized gains on equity securities of $70 million.

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Revenues from Non-Insurance Businesses. Revenues from non-insurance businesses were derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions and aviation-related businesses that provide services to aviation markets, including (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenues from non-insurance businesses were $89 million in 2019 and $77 million in 2018. The increase mainly relates to revenues from a business purchased in the second half of 2018.

Losses and Loss Expenses. Losses and loss expenses increased to $1,029 million in 2019 from $974 million in 2018. The consolidated loss ratio was 62.4% in 2019 and 61.6% in 2018. Catastrophe losses, net of reinsurance recoveries and reinstatement premiums, were $26 million in 2019 and $14 million in 2018. Favorable prior year reserve development (net of premium offsets) was $7 million in both 2019 and 2018. The loss ratio excluding catastrophe losses and prior year reserve development was 61.3% in 2019 and 61.2% in 2018.

A summary of loss ratios in 2019 compared with 2018 by business segment follows:

• Insurance - The loss ratio was 62.9% in 2019 and 62.4% in 2018. Catastrophe losses were $25 million in 2019 compared with $13 million in 2018. Favorable prior year reserve development was $8 million in 2019 and $10 million in 2018. The loss ratio excluding catastrophe losses and prior year reserve development increased 0.4 points to 61.7% in 2019 from 61.3% in 2018.

• Reinsurance & Monoline Excess - The loss ratio was 59.2% in 2019 and 54.6% in 2018. Catastrophe losses were $0.1 million in 2019 compared with $1 million in 2018. Adverse prior year reserve development was $1 million in 2019 and $3 million in 2018. The loss ratio excluding catastrophe losses and prior year reserve development decreased 0.3 points to 58.7% in 2019 from 59.0% in 2018.

Other Operating Costs and Expenses. Following is a summary of other operating costs and expenses:

($ in thousands)	2019		2018
Policy acquisition and insurance operating expenses	$	518,160	$	526,862
Insurance service expenses	25,386		30,990
Net foreign currency losses (gains)	470		(18,251		)
Other costs and expenses	47,812		53,541
Total	$	591,828	$	593,142

Policy acquisition and insurance operating expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Policy acquisition and insurance operating expenses decreased 2% and net premiums earned increased 4% from 2018. The expense ratio (underwriting expenses expressed as a percentage of premiums earned) was 31.5% in 2019 and 33.3% in 2018. The improvement is primarily attributable to higher net premiums earned, lower expenses and a non-recurring benefit of approximately 0.5% in 2019.

Service expenses, which represent the costs associated with the fee-based businesses, decreased to $25 million in 2019 from $31 million in 2018. The decrease is primarily due to the sale of a third party administration business in third quarter of 2018.

Net foreign currency (gains) losses result from transactions denominated in a currency other than a company's operating functional currency. Net foreign currency losses were $0.5 million in 2019 compared to gains of $18 million in 2018. The foreign currency gain in 2018 was mainly a result of the strengthening U.S. dollar.

Other costs and expenses represent general and administrative expenses of the parent company and other expenses not allocated to business segments, including the cost of certain long-term incentive plans and new business ventures. Other costs and expenses decreased to $48 million in 2019 from $54 million in 2018, primarily due to non-recurring performance-based compensation costs.

Expenses from Non-Insurance Businesses. Expenses from non-insurance businesses represent costs associated with businesses engaged in the distribution of promotional merchandise, world-wide textile solutions and aviation-related businesses that include (i) cost of goods sold related to aircraft and products sold and services provided, and (ii) general and administrative expenses. Expenses from non-insurance businesses were $88 million in 2019 compared to $75 million in 2018. The increase mainly relates to expenses from a business purchased in the second half of 2018.

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Interest Expense. Interest expense was $41 million in 2019 compared with $40 million in 2018. In March 2018, the Company issued $175 million aggregate principal amount of 5.70% subordinated debentures due 2058, and in April 2018, the Company issued another $10 million principal amount of such debentures. Additionally in 2018, the Company issued subsidiary debt of $116 million, which was primarily attributable to a non-recourse mortgage loan on a real estate property in Florida.

Income Taxes. The effective income tax rate was 20.6% in 2019 and 21.1% in 2018. The effective income tax rate differs from the federal income tax rate of 21% primarily because of tax-exempt income and tax on income from foreign jurisdictions with different tax rates.

The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $89 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. In the future, if such earnings were distributed the Company projects that the incremental tax, if any, will be immaterial.

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Investments

As part of its investment strategy, the Company establishes a level of cash and highly liquid short-term and intermediate-term securities that, combined with expected cash flow, it believes is adequate to meet its payment obligations. Due to the low fixed maturity investment returns, the Company invests in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets. The Company's investments in investment funds and its other alternative investments have experienced, and the Company expects to continue to experience, greater fluctuations in investment income.

The Company also attempts to maintain an appropriate relationship between the average duration of the investment portfolio and the approximate duration of its liabilities (i.e., policy claims and debt obligations). The average duration of the fixed maturity portfolio, including cash and cash equivalents, was 2.6 years at June 30, 2019 and 2.8 years at December 31, 2018. The Company’s fixed maturity investment portfolio and investment-related assets as of June 30, 2019 were as follows:

($ in thousands)	Carrying Value		Percent of Total
Fixed maturity securities:
U.S. government and government agencies	$	777,070	3.9	%
State and municipal:
Special revenue	2,402,349		12.2
Local general obligation	464,109		2.4
State general obligation	381,719		2.0
Pre-refunded (1)	324,068		1.7
Corporate backed	244,745		1.3
Total state and municipal	3,816,990		19.6
Mortgage-backed securities:
Agency	902,565		4.6
Residential-Prime	335,938		1.7
Commercial	309,781		1.6
Residential-Alt A	36,962		0.2
Total mortgage-backed securities	1,585,246		8.1
Asset-backed securities	2,701,785		13.9
Corporate:
Industrial	2,230,207		11.4
Financial	1,453,723		7.5
Utilities	324,322		1.7
Other	28,033		0.1
Total corporate	4,036,285		20.7
Foreign government and foreign government agencies	815,424		4.2
Total fixed maturity securities	13,732,800		70.4
Equity securities:
Preferred stocks	276,362		1.4
Common stocks	140,226		0.7
Total equity securities	416,588		2.1
Real estate	2,067,544		10.6
Investment funds	1,401,571		7.2
Cash and cash equivalents	1,258,174		6.5
Arbitrage trading account	533,442		2.7
Loans receivable	94,697		0.5
Total investments	$	19,504,816	100.0	%

________________________

(1) Pre-refunded securities are securities for which an escrow account has been established to fund the remaining payments of principal and interest through maturity. Such escrow accounts are funded almost exclusively with U.S. Treasury and U.S. government agency securities.

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Fixed Maturity Securities. The Company’s investment policy with respect to fixed maturity securities is generally to purchase instruments with the expectation of holding them to their maturity. However, management of the available for sale portfolio is considered necessary to maintain an approximate matching of assets and liabilities as well as to adjust the portfolio as a result of changes in financial market conditions and tax considerations.

The Company’s philosophy related to holding or selling fixed maturity securities is based on its objective of maximizing total return. The key factors that management considers in its investment decisions as to whether to hold or sell fixed maturity securities are its view of the underlying fundamentals of specific securities as well as its expectations regarding interest rates, credit spreads and currency values. In a period in which management expects interest rates to rise, the Company may sell longer duration securities in order to mitigate the impact of an interest rate rise on the fair value of the portfolio. Similarly, in a period in which management expects credit spreads to widen, the Company may sell lower quality securities, and in a period in which management expects certain foreign currencies to decline in value, the Company may sell securities denominated in those foreign currencies. The sale of fixed maturity securities in order to achieve the objective of maximizing total return may result in realized gains; however, there is no reason to expect these gains to continue in future periods.

Equity Securities. Equity securities primarily represent investments in common and preferred stocks in companies with potential growth opportunities in different sectors, mainly in the financial institutions sector.

Investment Funds. At June 30, 2019, the carrying value of investment funds was $1,402 million, including investments in other funds of $672 million, real estate funds of $655 million, and energy funds of $75 million. Investment funds are generally reported on a one-quarter lag.

Real Estate. Real estate is directly owned property held for investment. At June 30, 2019, real estate properties in operation included a long-term ground lease in Washington D.C., a hotel in Memphis, Tennessee, two office complexes in New York City, office buildings in West Palm Beach and Palm Beach, Florida, and an office building in London. In addition, there is a mixed-use project in Washington D.C. under development. The Company expects to fund further development costs for the project with a combination of its own funds and external financing.

Arbitrage Trading Account. The arbitrage trading account is comprised of direct investments in arbitrage securities. Merger arbitrage is the business of investing in the securities of publicly held companies that are the targets in announced tender offers and mergers.

Loans Receivable. Loans receivable, which are carried at amortized cost, had an aggregate cost of $95 million and an aggregate fair value of $97 million at June 30, 2019. The amortized cost of loans receivable is net of a valuation allowance of $2 million as of June 30, 2019. Loans receivable include real estate loans of $62 million that are secured by commercial real estate located primarily in New York. Real estate loans receivable generally earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025. Loans receivable include commercial loans of $33 million that are secured by business assets and have fixed interest rates and floating LIBOR-based interest rates with varying maturities not exceeding 10 years.

Market Risk. The fair value of the Company’s investments is subject to risks of fluctuations in credit quality and interest rates. The Company uses various models and stress test scenarios to monitor and manage interest rate risk. The Company attempts to manage its interest rate risk by maintaining an appropriate relationship between the effective duration of the investment portfolio and the approximate duration of its liabilities (i.e., policy claims and debt obligations). The effective duration for the fixed maturity portfolio (including cash and cash equivalents) was 2.6 years at June 30, 2019 and 2.8 years at December 31, 2018.

In addition, the fair value of the Company’s international investments is subject to currency risk. The Company attempts to manage its currency risk by matching its foreign currency assets and liabilities where considered appropriate.

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Liquidity and Capital Resources

Cash Flow. Cash flow provided from operating activities was $403 million in the first six months of 2019 as compared to $119 million from operating activities in the first six months of 2018. The increase is primarily due to an increase in net premium receipts and reduced loss and loss expense payments.

The Company's insurance subsidiaries' principal sources of cash are premiums, investment income, service fees and proceeds from sales and maturities of portfolio investments. The principal uses of cash are payments for claims, taxes, operating expenses and dividends. The Company expects its insurance subsidiaries to fund the payment of losses with cash received from premiums, investment income and fees. The Company targets an average duration for its investment portfolio that is within one year of the average duration of its liabilities so that portions of its investment portfolio mature throughout the claim cycle and are available for the payment of claims if necessary. In the event operating cash flow and proceeds from maturities and prepayments of fixed income securities are not sufficient to fund claim payments and other cash requirements, the remainder of the Company's cash and investments is available to pay claims and other obligations as they become due. The Company's investment portfolio is highly liquid, with approximately 77% invested in cash, cash equivalents and marketable fixed maturity securities as of June 30, 2019. If the sale of fixed maturity securities were to become necessary, a realized gain or loss equal to the difference between the cost and sales price of securities sold would be recognized.

Debt. At June 30, 2019, the Company had senior notes, subordinated debentures and other debt outstanding with a carrying value of $2,782 million and a face amount of $2,817 million. The maturities of the outstanding debt are $447 million in 2019, $306 million in 2020, $427 million in 2022, $102 million in 2028, $250 million in 2037, $350 million in 2044, $350 million in 2053, $400 million in 2056, and $185 million in 2058.

Equity. At June 30, 2019, total common stockholders’ equity was $6.0 billion, common shares outstanding were 183,168,398 and stockholders’ equity per outstanding share was $32.63. The number of common shares outstanding excludes shares held in a grantor trust established by the Company for delivery upon settlement of vested but mandatorily deferred RSUs.

Total Capital. Total capitalization (equity, debt and subordinated debentures) was $8.8 billion at June 30, 2019. The percentage of the Company’s capital attributable to senior notes, subordinated debentures and other debt was 32% at June 30, 2019 and 34% at December 31, 2018.

Item 3.     Quantitative and Qualitative Disclosure About Market Risk

Reference is made to the information under “Investments - Market Risk” under the caption “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in this Form 10-Q.

Item 4.     Controls and Procedures

Disclosure Controls and Procedures. The Company’s management, including its Chief Executive Officer and Chief Financial Officer, has conducted an evaluation of the effectiveness of the Company’s disclosure controls and procedures pursuant to Securities Exchange Act Rule 13a-14 as of the end of the period covered by this quarterly report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the Company has in place effective controls and procedures designed to ensure that information required to be disclosed by the Company in the reports it files or submits under the Securities Exchange Act of 1934, as amended, and the rules thereunder, is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.

Changes in Internal Control over Financial Reporting. During the quarter ended June 30, 2019, there were no changes in the Company’s internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

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PART II — OTHER INFORMATION

Item 1. Legal Proceedings

Please see Note 20 to the notes to the interim consolidated financial statements.

Item 1A. Risk Factors

There have been no material changes from the risk factors previously disclosed in the Company's annual report on From 10-K for the fiscal year ended December 31, 2018.

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

The Company did not repurchase any of its shares during the six months ended June 30, 2019, and accordingly the number of shares authorized for purchase by the Company remains 8,911,397.

Item 6. Exhibits

Number
(31.1)	Certification of the Chief Executive Officer pursuant to Rule 13a-14(a)/ 15d-14(a).
(31.2)	Certification of the Chief Financial Officer pursuant to Rule 13a-14(a)/ 15d-14(a).
(32.1)	Certification of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

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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.

		W. R. BERKLEY CORPORATION
Date:	August 5, 2019	/s/ W. Robert Berkley, Jr.
		W. Robert Berkley, Jr.
		President and Chief Executive Officer
Date:	August 5, 2019	/s/ Richard M. Baio
		Richard M. Baio
		Executive Vice President Chief Financial Officer and Treasurer

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EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, W. Robert Berkley, Jr., President and Chief Executive Officer of W. R. Berkley Corporation (the “registrant”), certify that:

1. I have reviewed this quarterly report on Form 10-Q of the registrant;

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: August 5, 2019

/s/ W. Robert Berkley, Jr.

W. Robert Berkley, Jr.

President and

Chief Executive Officer 

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Richard M. Baio, Senior Vice President - Chief Financial Officer and Treasurer of W. R. Berkley Corporation (the “registrant”), certify that:

1. I have reviewed this quarterly report on Form 10-Q of the registrant;

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: August 5, 2019

/s/ Richard M. Baio

Richard M. Baio

Executive Vice President - Chief Financial Officer
and Treasurer

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 of W. R. Berkley Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, W. Robert Berkley, Jr., President and Chief Executive Officer of the Company, and Richard M. Baio, Senior Vice President - Chief Financial Officer and Treasurer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §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.

/s/ W. Robert Berkley, Jr.

W. Robert Berkley, Jr.

President and Chief Executive Officer

/s/ Richard M. Baio

Richard M. Baio

Executive Vice President - Chief Financial Officer and Treasurer

August 5, 2019

A signed original of this written statement required by Section 906 has been provided to W. R. Berkley Corporation (the “Company”) and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Cover Page - shares	6 Months Ended
	Jun. 30, 2019	Jul. 30, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	1-15202
Entity Registrant Name	W. R. BERKLEY CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-1867895
Entity Address, Address Line One	475 Steamboat Road
Entity Address, City or Town	Greenwich
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06830
City Area Code	(203)
Local Phone Number	629-3000
Title of 12(b) Security	Common Stock, par value $.20 per share
Trading Symbol	WRB
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		183,176,414
Entity Central Index Key	0000011544
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
5.625% Subordinated Debentures due 2053
Entity Information [Line Items]
Title of 12(b) Security	5.625% Subordinated Debentures due 2053
Trading Symbol	WRB B
Security Exchange Name	NYSE
5.9% Subordinated Debentures due 2056
Entity Information [Line Items]
Title of 12(b) Security	5.9% Subordinated Debentures due 2056
Trading Symbol	WRB C
Security Exchange Name	NYSE
5.75% Subordinated Debentures due 2056
Entity Information [Line Items]
Title of 12(b) Security	5.75% Subordinated Debentures due 2056
Trading Symbol	WRB D
Security Exchange Name	NYSE
5.70% Subordinated Debentures due 2058
Entity Information [Line Items]
Title of 12(b) Security	5.70% Subordinated Debentures due 2058
Trading Symbol	WRB E
Security Exchange Name	NYSE

XML

Consolidated Balance Sheets Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments:
Fixed maturity securities	$ 13,732,800	$ 13,606,812
Real estate	2,067,544	1,957,092
Investment funds	1,401,571	1,332,818
Arbitrage trading account	533,442	452,548
Equity securities	416,588	279,006
Loans receivable	94,697	94,813
Total investments	18,246,642	17,723,089
Cash and cash equivalents	1,258,174	817,602
Premiums and fees receivable	2,034,036	1,807,762
Due from reinsurers	2,040,250	1,932,291
Deferred policy acquisition costs	520,908	497,629
Prepaid reinsurance premiums	538,358	498,880
Trading account receivables from brokers and clearing organizations	402,361	347,228
Property, furniture and equipment	398,885	416,372
Goodwill	173,037	173,037
Accrued investment income	140,864	144,481
Federal and foreign income taxes	0	36,193
Other assets	734,388	501,413
Total assets	26,487,903	24,895,977
Liabilities:
Reserves for losses and loss expenses	12,320,278	11,966,448
Unearned premiums	3,614,152	3,359,991
Due to reinsurers	294,949	256,917
Trading account securities sold but not yet purchased	159,349	38,120
Federal and foreign income taxes	38,437	0
Other liabilities	1,258,995	1,005,184
Senior notes and other debt	1,873,799	1,882,028
Subordinated debentures	907,866	907,491
Total liabilities	20,467,825	19,416,179
Equity:
Perferred stock, par value $.10 per share: Authorized 5,000,000 shares; issued and outstanding - none	0	0
Common stock, par value $.20 per share: Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 121,716,402 and 121,514,852 shares, respectively	70,535	70,535
Additional paid-in capital	1,058,416	1,039,633
Retained earnings	7,826,015	7,558,619
Accumulated other comprehensive loss	(260,796)	(510,470)
Treasury stock, at cost, 169,508,366 and 169,683,237 shares, respectively	(2,717,410)	(2,720,466)
Total stockholders’ equity	5,976,760	5,437,851
Noncontrolling interests	43,318	41,947
Total equity	6,020,078	5,479,798
Total liabilities and equity	$ 26,487,903	$ 24,895,977

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Consolidated Balance Sheets Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock issued (in shares)	5,000,000	5,000,000
Preferred stock outstanding (in shares)	0	0
Common stock, par value (in dollar per share)	$ 0.2	$ 0.2
Common shares authorized (in shares)	500,000,000	500,000,000
Common shares issued (in shares)	183,168,398	182,993,640
Common shares outstanding (in shares)	183,168,398	182,993,640
Treasury stock issued at cost (in shares)	169,508,366	169,683,237

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Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
REVENUES:
Net premiums written	$ 1,743,464	$ 1,624,104	$ 3,453,065	$ 3,289,442
Change in net unearned premiums	(96,623)	(43,051)	(213,368)	(140,981)
Net premiums earned	1,646,841	1,581,053	3,239,697	3,148,461
Net investment income	188,333	153,777	346,587	328,295
Net realized and unrealized gains on investments	73,574	69,631	142,226	118,095
Revenues from non-insurance businesses	89,297	76,698	181,124	146,869
Insurance service fees	22,446	29,719	47,759	60,393
Other income	2,893	38	3,013	50
Total revenues	2,023,384	1,910,916	3,960,406	3,802,163
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	1,028,830	973,636	2,017,479	1,936,856
Other operating costs and expenses	591,828	593,142	1,179,916	1,203,581
Expenses from non-insurance businesses	88,272	75,191	178,397	144,734
Interest expense	40,718	39,705	81,439	76,760
Total operating costs and expenses	1,749,648	1,681,674	3,457,231	3,361,931
Income before income taxes	273,736	229,242	503,175	440,232
Income tax expense	(56,309)	(48,464)	(104,134)	(91,881)
Net income before noncontrolling interests	217,427	180,778	399,041	348,351
Noncontrolling interests	(718)	(703)	(1,610)	(1,879)
Net income to common stockholders	$ 216,709	$ 180,075	$ 397,431	$ 346,472
NET INCOME PER SHARE:
Basic (in dollar per share)	$ 1.14	$ 0.95	$ 2.09	$ 1.83
Diluted (in dollar per share)	$ 1.12	$ 0.93	$ 2.06	$ 1.80

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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 217,427	$ 180,778	$ 399,041	$ 348,351
Other comprehensive income (loss):
Change in unrealized currency translation adjustments	(14,492)	(104,455)	5,268	(91,656)
Change in unrealized investment gains (losses), net of taxes	118,649	(32,442)	244,424	(158,214)
Other comprehensive income (loss)	104,157	(136,897)	249,692	(249,870)
Comprehensive income	321,584	43,881	648,733	98,481
Noncontrolling interests	(748)	(666)	(1,592)	(1,853)
Comprehensive income to common stockholders	$ 320,836	$ 43,215	$ 647,141	$ 96,628

XML

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated Other Comprehensive Income (Loss)	Unrealized investment gain	Currency Translation Adjustments	Treasury stock	Noncontrolling interest
Beginning of period at Dec. 31, 2017		$ 70,535	$ 1,024,771	$ 6,956,882	$ 68,541	$ 375,421	$ (306,880)	$ (2,709,386)	$ 39,819
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(5,642)
Restricted stock units expensed			17,667
Cumulative effect adjustment resulting from changes in accounting principles				215,939		(214,539)
Net income before noncontrolling interests	$ 348,351			346,472					1,879
Dividends ($0.61, $0.43, $0.71 and $0.53 per share, respectively)				(96,131)
Change in unrealized gains (losses) on securities not other-than-temporarily impaired	(158,214)					(158,199)
Change in unrealized gains (losses) on other-than-temporarily impaired securities						11
Net change in period	(91,656)						(91,656)
Stock exercised/vested								6,963
Stock repurchased								(6,799)
Stock issued								688
Distributions									(2,162)
Other comprehensive income (loss), net of tax	$ (249,870)				(249,870)		(91,656)		(26)
End of period at Jun. 30, 2018			1,036,796	7,423,162	(395,842)	2,694	(398,536)	(2,708,534)	39,510
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividends, per share, cash paid (in dollars per share)	$ 0.53
Beginning of period at Mar. 31, 2018		70,535	1,033,718	7,322,201	(258,982)	35,099	(294,081)	(2,715,697)	40,404
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(5,155)
Restricted stock units expensed			8,233
Cumulative effect adjustment resulting from changes in accounting principles				0		0
Net income before noncontrolling interests	$ 180,778			180,075					703
Dividends ($0.61, $0.43, $0.71 and $0.53 per share, respectively)				(79,114)
Change in unrealized gains (losses) on securities not other-than-temporarily impaired	(32,442)					(32,403)
Change in unrealized gains (losses) on other-than-temporarily impaired securities						(2)
Net change in period	(104,455)						(104,455)
Stock exercised/vested								6,475
Stock repurchased								0
Stock issued								688
Distributions									(1,560)
Other comprehensive income (loss), net of tax	$ (136,897)				(136,897)		(104,455)		(37)
End of period at Jun. 30, 2018			1,036,796	7,423,162	(395,842)	2,694	(398,536)	(2,708,534)	39,510
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividends, per share, cash paid (in dollars per share)	$ 0.43
Beginning of period at Dec. 31, 2018	$ 5,479,798	70,535	1,039,633	7,558,619	(510,470)	(91,491)	(418,979)	(2,720,466)	41,947
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(2,504)
Restricted stock units expensed			21,287
Cumulative effect adjustment resulting from changes in accounting principles				0		0
Net income before noncontrolling interests	399,041			397,431					1,610
Dividends ($0.61, $0.43, $0.71 and $0.53 per share, respectively)				(130,035)
Change in unrealized gains (losses) on securities not other-than-temporarily impaired	244,424					244,393
Change in unrealized gains (losses) on other-than-temporarily impaired securities						13
Net change in period	5,268						5,268
Stock exercised/vested								2,504
Stock repurchased								0
Stock issued								552
Distributions									(221)
Other comprehensive income (loss), net of tax	249,692				249,692		5,268		(18)
End of period at Jun. 30, 2019	$ 6,020,078		1,058,416	7,826,015	(260,796)	152,915	(413,711)	(2,717,410)	43,318
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividends, per share, cash paid (in dollars per share)	$ 0.71
Beginning of period at Mar. 31, 2019		$ 70,535	1,053,372	7,721,039	(364,983)	34,236	(399,219)	(2,720,011)	42,844
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(2,049)
Restricted stock units expensed			7,093
Cumulative effect adjustment resulting from changes in accounting principles				0		0
Net income before noncontrolling interests	$ 217,427			216,709					718
Dividends ($0.61, $0.43, $0.71 and $0.53 per share, respectively)				(111,733)
Change in unrealized gains (losses) on securities not other-than-temporarily impaired	118,649					118,597
Change in unrealized gains (losses) on other-than-temporarily impaired securities						82
Net change in period	(14,492)						(14,492)
Stock exercised/vested								2,049
Stock repurchased								0
Stock issued								552
Distributions									(274)
Other comprehensive income (loss), net of tax	104,157				104,157		(14,492)		30
End of period at Jun. 30, 2019	$ 6,020,078		$ 1,058,416	$ 7,826,015	$ (260,796)	$ 152,915	$ (413,711)	$ (2,717,410)	$ 43,318
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividends, per share, cash paid (in dollars per share)	$ 0.61

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 397,431	$ 346,472
Adjustments to reconcile net income to net cash from (used in) operating activities:
Net realized and unrealized gains on investments	(142,226)	(118,095)
Depreciation and amortization	51,289	56,372
Noncontrolling interests	1,610	1,879
Investment funds	(58,251)	(53,070)
Stock incentive plans	27,340	19,722
Change in:
Arbitrage trading account	(14,797)	(7,871)
Premiums and fees receivable	(223,771)	(152,832)
Reinsurance accounts	(112,681)	(77,140)
Deferred policy acquisition costs	(23,632)	(11,152)
Income taxes	2,759	(39,069)
Reserves for losses and loss expenses	350,981	123,582
Unearned premiums	254,010	171,468
Other	(107,416)	(140,904)
Net cash from operating activities	402,646	119,362
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	1,320,079	2,773,554
Proceeds from sale of equity securities	39,103	284,204
Contributions to investment funds	(2,896)	(4,996)
Proceeds from maturities and prepayments of fixed maturity securities	1,490,772	1,305,805
Purchase of fixed maturity securities	(2,633,251)	(4,062,901)
Purchase of equity securities	(41,849)	(87,059)
Real estate purchased	(117,773)	(419,021)
Change in loans receivable	140	(16,310)
Net additions to property, furniture and equipment	(10,804)	(29,704)
Change in balances due to security brokers	19,096	46,641
Payment for business purchased net of cash acquired	0	6,637
Net cash from (used in) investing activities	62,617	(216,424)
CASH (USED IN) FROM FINANCING ACTIVITIES:
Repayment of senior notes and other debt	0	(23)
Net proceeds from issuance of debt	0	200,838
Cash dividends to common stockholders	(18,302)	(77,873)
Purchase of common treasury shares	0	(6,799)
Other, net	(5,548)	(1,763)
Net cash (used in) from financing activities	(23,850)	114,380
Net impact on cash due to change in foreign exchange rates	(841)	(56,587)
Net change in cash and cash equivalents	440,572	(39,269)
Cash and cash equivalents at beginning of year	817,602	950,471
Cash and cash equivalents at end of period	$ 1,258,174	$ 911,202

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General

6 Months Ended

Jun. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

General

General

The unaudited consolidated financial statements, which include the accounts of W. R. Berkley Corporation and its subsidiaries (the “Company”) have been prepared on the basis of U.S. generally accepted accounting principles (“GAAP”) for interim financial information. Accordingly, they do not include all the information and notes required by GAAP for annual financial statements. The unaudited consolidated financial statements reflect all adjustments, consisting only of normal recurring items, which are necessary to present fairly the Company’s financial position and results of operations on a basis consistent with the prior audited consolidated financial statements. Operating results for interim periods are not necessarily indicative of the results that may be expected for the year. All significant intercompany accounts and transactions have been eliminated. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the revenues and expenses reflected during the reporting period. For further information related to areas of judgment and estimates and other information necessary to understand the Company’s financial position and results of operations, refer to the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

Reclassifications have been made in the 2018 financial statements as originally reported to conform to the presentation of the 2019 financial statements. Shares outstanding and per share amounts have been adjusted to reflect the 3-for-2 common stock split effected on April 2, 2019. Additionally, commencing with the first quarter of 2019, the Company renamed the Reinsurance segment to Reinsurance & Monoline Excess, and reclassified the monoline excess business from the Insurance segment. The reclassified business includes operations that solely retain risk on an excess basis.

The income tax provision has been computed based on the Company’s estimated annual effective tax rate. The effective tax rate for the quarter differs from the federal income tax rate of 21% principally because of tax-exempt investment income, as well as tax on income from foreign jurisdictions with different tax rates.

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Per Share Data

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Per Share Data

Per Share Data

The Company presents both basic and diluted net income per share (“EPS”) amounts. Basic EPS is calculated by dividing net income by the weighted average number of common shares outstanding during the period (including 7,389,781 and 7,270,954 common shares held in a grantor trust as of June 30, 2019 and 2018, respectively). The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since the shares deliverable under vested RSUs were already included in diluted shares outstanding. Diluted EPS is based upon the weighted average number of basic and common equivalent shares outstanding during the period and is calculated using the treasury stock method for stock incentive plans. Common equivalent shares are excluded from the computation in periods in which they have an anti-dilutive effect.

The weighted average number of common shares used in the computation of basic and diluted earnings per share was as follows:

	For the Three Months Ended June 30,		For the Six Months Ended June 30,
(In thousands)	2019	2018	2019	2018
Basic	190,512	189,776	190,456	189,669
Diluted	193,059	192,509	192,804	192,284

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Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Recently adopted accounting pronouncements:

In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02, Leases, which amends the accounting and disclosure guidance for leases. This guidance retains the two classifications of a lease, as either an operating or finance lease, both of which require lessees to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months. The right-of-use asset and the lease liability are determined based upon the present value of cash flows. Finance leases reflect the financial arrangement by recognizing interest expense on the lease liability separately from the amortization expense of the right-of-use asset. Operating leases recognize lease expense (with no separate recognition of interest expense) on a straight-line basis over the term of the lease. The accounting

by lessors is not significantly changed by the updated guidance. The updated guidance was effective for reporting periods beginning after December 15, 2018. As permitted by the rules, the Company adopted the new guidance prospectively for the quarter ended March 31, 2019. The Company elected to use the practical expedient permitted by the transition guidance which allowed companies to not reassess existing lease classifications for already effective leases. The adoption of this guidance resulted in the recognition of a right-of-use asset of $185 million and a lease liability of $215 million (prior to adoption the Company had a $30 million deferred rent liability recognized) reported within other assets and other liabilities, respectively, in the consolidated balance sheet. The adoption of this guidance did not have an impact on the Company's results of operations or liquidity.

All other accounting and reporting standards that have become effective in 2019 were either not applicable to the Company or their adoption did not have a material impact on the Company. 

Accounting and reporting standards that are not yet effective:

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which amends the accounting guidance for credit losses on financial instruments. The updated guidance amends the current other-than-temporary impairment model for available-for-sale debt securities by requiring the recognition of impairments relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. This guidance also applies a new current expected credit loss model for determining credit-related impairments for financial instruments measured at amortized cost, such as reinsurance recoverables. The updated guidance is effective for reporting periods beginning after December 15, 2019. The Company will not be able to determine the impact the adoption of this guidance will have on its results of operations, financial position or liquidity until the year the guidance becomes effective.

All other recently issued but not yet effective accounting and reporting standards are either not applicable to the Company or are not expected to have a material impact on the Company.

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Consolidated Statements of Comprehensive Income

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Consolidated Statements of Comprehensive Income

Consolidated Statement of Comprehensive Income

The following table presents the components of the changes in accumulated other comprehensive (loss) income ("AOCI"):

(In thousands)	Unrealized Investment Gains (Losses)				Currency Translation Adjustments			Accumulated Other Comprehensive (Loss) Income
As of and for the six months ended June 30, 2019
Changes in AOCI
Beginning of period	$	(91,491	)		$	(418,979	)	$	(510,470	)
Other comprehensive income before reclassifications	245,615				5,268			250,883
Amounts reclassified from AOCI	(1,191		)		—			(1,191		)
Other comprehensive income	244,424				5,268			249,692
Unrealized investment loss related to noncontrolling interest	(18		)		—			(18		)
End of period	$	152,915			$	(413,711	)	$	(260,796	)
Amounts reclassified from AOCI
Pre-tax	$	(1,508	)	(1)	$	—		$	(1,508	)
Tax effect	317			(2)	—			317
After-tax amounts reclassified	$	(1,191	)		$	—		$	(1,191	)
Other comprehensive income
Pre-tax	$	316,331			$	5,268		$	321,599
Tax effect	(71,907		)		—			(71,907		)
Other comprehensive income	$	244,424			$	5,268		$	249,692
As of and for the three months ended June 30, 2019
Changes in AOCI
Beginning of period	$	34,236			$	(399,219	)	$	(364,983	)
Other comprehensive income (loss) before reclassifications	118,475				(14,492		)	103,983
Amounts reclassified from AOCI	174				—			174
Other comprehensive income (loss)	118,649				(14,492		)	104,157
Unrealized investment losses related to noncontrolling interest	30				—			30
Ending balance	$	152,915			$	(413,711	)	$	(260,796	)
Amounts reclassified from AOCI
Pre-tax	$	220		(1)	$	—		$	220
Tax effect	(46		)	(2)	—			(46		)
After-tax amounts reclassified	$	174			$	—		$	174
Other comprehensive income (loss)
Pre-tax	$	147,072			$	(14,492	)	$	132,580
Tax effect	(28,423		)		—			(28,423		)
Other comprehensive income (loss)	$	118,649			$	(14,492	)	$	104,157

_________________________

⁽¹⁾ Net realized and unrealized gains on investments in the consolidated statements of income.

⁽²⁾ Income tax expense in the consolidated statements of income.

(In thousands)	Unrealized Investment Gains (Losses)				Currency Translation Adjustments			Accumulated Other Comprehensive (Loss) Income
As of and for the six months ended June 30, 2018
Changes in AOCI
Beginning of period	$	375,421			$	(306,880	)	$	68,541
Cumulative effect adjustment resulting from changes in accounting principles	(214,539		)		—			(214,539		)
Restated beginning of period	160,882				(306,880		)	(145,998		)
Other comprehensive loss before reclassifications	(147,632		)		(91,656		)	(239,288		)
Amounts reclassified from AOCI	(10,582		)		—			(10,582		)
Other comprehensive loss	(158,214		)		(91,656		)	(249,870		)
Unrealized investment loss related to noncontrolling interest	26				—			26
End of period	$	2,694			$	(398,536	)	$	(395,842	)
Amounts reclassified from AOCI
Pre-tax	$	(13,395	)	(1)	$	—		$	(13,395	)
Tax effect	2,813			(2)	—			2,813
After-tax amounts reclassified	$	(10,582	)		$	—		$	(10,582	)
Other comprehensive loss
Pre-tax	$	(201,336	)		$	(91,656	)	$	(292,992	)
Tax effect	43,122				—			43,122
Other comprehensive loss	$	(158,214	)		$	(91,656	)	$	(249,870	)
As of and for the three months ended June 30, 2018
Changes in AOCI
Beginning of period	$	35,099			$	(294,081	)	$	(258,982	)
Other comprehensive loss before reclassifications	(29,443		)		(104,455		)	(133,898		)
Amounts reclassified from AOCI	(2,999		)		—			(2,999		)
Other comprehensive loss	(32,442		)		(104,455		)	(136,897		)
Unrealized investment loss related to noncontrolling interest	37				—			37
Ending balance	$	2,694			$	(398,536	)	$	(395,842	)
Amounts reclassified from AOCI
Pre-tax	$	(3,796	)	(1)	$	—		$	(3,796	)
Tax effect	797			(2)	—			797
After-tax amounts reclassified	$	(2,999	)		$	—		$	(2,999	)
Other comprehensive loss
Pre-tax	$	(40,488	)		$	(104,455	)	$	(144,943	)
Tax effect	8,046				—			8,046
Other comprehensive loss	$	(32,442	)		$	(104,455	)	$	(136,897	)

_________________________

⁽¹⁾ Net realized and unrealized gains on investments in the consolidated statements of income.

⁽²⁾ Income tax expense in the consolidated statements of income.

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Statements of Cash Flow	6 Months Ended
	Jun. 30, 2019
Supplemental Cash Flow Elements [Abstract]
Statements of Cash Flow	Statements of Cash FlowsInterest payments were $77,672,000 and $72,878,000 and income taxes paid were $82,800,000 and $111,000,000 for the six months ended June 30, 2019 and 2018, respectively.

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Investments In Fixed Maturity Securities

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Investments In Fixed Maturity Securities

Investments in Fixed Maturity Securities

At June 30, 2019 and December 31, 2018, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2019
Held to maturity:
State and municipal	$	69,167	$	13,089	$	—		$	82,256	$	69,167
Residential mortgage-backed	9,380		1,083		—			10,463		9,380
Total held to maturity	78,547		14,172		—			92,719		78,547
Available for sale:
U.S. government and government agency	760,247		18,241		(1,418		)	777,070		777,070
State and municipal:
Special revenue	2,322,750		63,204		(2,674		)	2,383,280		2,383,280
State general obligation	320,338		22,108		(43		)	342,403		342,403
Pre-refunded	298,825		19,876		(122		)	318,579		318,579
Corporate backed	238,319		7,065		(639		)	244,745		244,745
Local general obligation	427,233		32,026		(443		)	458,816		458,816
Total state and municipal	3,607,465		144,279		(3,921		)	3,747,823		3,747,823
Mortgage-backed securities:
Residential (1)	1,242,880		28,521		(5,316		)	1,266,085		1,266,085
Commercial	303,332		6,829		(380		)	309,781		309,781
Total mortgage-backed securities	1,546,212		35,350		(5,696		)	1,575,866		1,575,866
Asset-backed	2,719,618		9,874		(27,707		)	2,701,785		2,701,785
Corporate:
Industrial	2,178,339		59,623		(7,755		)	2,230,207		2,230,207
Financial	1,431,612		27,484		(5,373		)	1,453,723		1,453,723
Utilities	312,200		12,548		(426		)	324,322		324,322
Other	27,027		1,096		(90		)	28,033		28,033
Total corporate	3,949,178		100,751		(13,644		)	4,036,285		4,036,285
Foreign government	818,276		20,507		(23,359		)	815,424		815,424
Total available for sale	13,400,996		329,002		(75,745		)	13,654,253		13,654,253
Total investments in fixed maturity securities	$	13,479,543	$	343,174	$	(75,745	)	$	13,746,972	$	13,732,800

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Held to maturity:
State and municipal	$	67,891	$	11,549	$	—		$	79,440	$	67,891
Residential mortgage-backed	10,744		1,259		—			12,003		10,744
Total held to maturity	78,635		12,808		—			91,443		78,635
Available for sale:
U.S. government and government agency	697,931		9,219		(4,910		)	702,240		702,240
State and municipal:
Special revenue	2,396,089		30,507		(19,790		)	2,406,806		2,406,806
State general obligation	335,626		11,951		(1,103		)	346,474		346,474
Pre-refunded	408,141		16,568		(30		)	424,679		424,679
Corporate backed	272,440		4,319		(2,350		)	274,409		274,409
Local general obligation	403,219		18,350		(1,339		)	420,230		420,230
Total state and municipal	3,815,515		81,695		(24,612		)	3,872,598		3,872,598
Mortgage-backed securities:
Residential (1)	1,264,376		7,729		(20,225		)	1,251,880		1,251,880
Commercial	345,070		1,304		(3,708		)	342,666		342,666
Total mortgage-backed securities	1,609,446		9,033		(23,933		)	1,594,546		1,594,546
Asset-backed	2,462,303		10,131		(33,687		)	2,438,747		2,438,747
Corporate:
Industrial	2,295,778		15,355		(53,312		)	2,257,821		2,257,821
Financial	1,502,427		7,178		(45,683		)	1,463,922		1,463,922
Utilities	330,326		2,997		(4,148		)	329,175		329,175
Other	60,238		322		(167		)	60,393		60,393
Total corporate	4,188,769		25,852		(103,310		)	4,111,311		4,111,311
Foreign government	822,093		11,753		(25,111		)	808,735		808,735
Total available for sale	13,596,057		147,683		(215,563		)	13,528,177		13,528,177
Total investments in fixed maturity securities	$	13,674,692	$	160,491	$	(215,563	)	$	13,619,620	$	13,606,812

____________

(1) Gross unrealized losses for residential mortgage-backed securities include $(42,762) and $(55,090) as of June 30, 2019 and December 31, 2018, respectively, related to securities with the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.

The amortized cost and fair value of fixed maturity securities at June 30, 2019, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.

 

(In thousands)	Amortized Cost		Fair Value
Due in one year or less	$	1,017,744	$	1,022,427
Due after one year through five years	4,680,578		4,764,795
Due after five years through ten years	3,226,328		3,347,580
Due after ten years	2,999,301		3,025,841
Mortgage-backed securities	1,555,592		1,586,329
Total	$	13,479,543	$	13,746,972

At June 30, 2019 and December 31, 2018, there were no investments that exceeded 10% of common stockholders' equity, other than investments in United States government and government agency securities.

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Investments in Equity Securities

6 Months Ended

Jun. 30, 2019

Debt Securities, Available-for-sale [Line Items]

Investments in Equity Securities

Investments in Fixed Maturity Securities

At June 30, 2019 and December 31, 2018, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2019
Held to maturity:
State and municipal	$	69,167	$	13,089	$	—		$	82,256	$	69,167
Residential mortgage-backed	9,380		1,083		—			10,463		9,380
Total held to maturity	78,547		14,172		—			92,719		78,547
Available for sale:
U.S. government and government agency	760,247		18,241		(1,418		)	777,070		777,070
State and municipal:
Special revenue	2,322,750		63,204		(2,674		)	2,383,280		2,383,280
State general obligation	320,338		22,108		(43		)	342,403		342,403
Pre-refunded	298,825		19,876		(122		)	318,579		318,579
Corporate backed	238,319		7,065		(639		)	244,745		244,745
Local general obligation	427,233		32,026		(443		)	458,816		458,816
Total state and municipal	3,607,465		144,279		(3,921		)	3,747,823		3,747,823
Mortgage-backed securities:
Residential (1)	1,242,880		28,521		(5,316		)	1,266,085		1,266,085
Commercial	303,332		6,829		(380		)	309,781		309,781
Total mortgage-backed securities	1,546,212		35,350		(5,696		)	1,575,866		1,575,866
Asset-backed	2,719,618		9,874		(27,707		)	2,701,785		2,701,785
Corporate:
Industrial	2,178,339		59,623		(7,755		)	2,230,207		2,230,207
Financial	1,431,612		27,484		(5,373		)	1,453,723		1,453,723
Utilities	312,200		12,548		(426		)	324,322		324,322
Other	27,027		1,096		(90		)	28,033		28,033
Total corporate	3,949,178		100,751		(13,644		)	4,036,285		4,036,285
Foreign government	818,276		20,507		(23,359		)	815,424		815,424
Total available for sale	13,400,996		329,002		(75,745		)	13,654,253		13,654,253
Total investments in fixed maturity securities	$	13,479,543	$	343,174	$	(75,745	)	$	13,746,972	$	13,732,800

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Held to maturity:
State and municipal	$	67,891	$	11,549	$	—		$	79,440	$	67,891
Residential mortgage-backed	10,744		1,259		—			12,003		10,744
Total held to maturity	78,635		12,808		—			91,443		78,635
Available for sale:
U.S. government and government agency	697,931		9,219		(4,910		)	702,240		702,240
State and municipal:
Special revenue	2,396,089		30,507		(19,790		)	2,406,806		2,406,806
State general obligation	335,626		11,951		(1,103		)	346,474		346,474
Pre-refunded	408,141		16,568		(30		)	424,679		424,679
Corporate backed	272,440		4,319		(2,350		)	274,409		274,409
Local general obligation	403,219		18,350		(1,339		)	420,230		420,230
Total state and municipal	3,815,515		81,695		(24,612		)	3,872,598		3,872,598
Mortgage-backed securities:
Residential (1)	1,264,376		7,729		(20,225		)	1,251,880		1,251,880
Commercial	345,070		1,304		(3,708		)	342,666		342,666
Total mortgage-backed securities	1,609,446		9,033		(23,933		)	1,594,546		1,594,546
Asset-backed	2,462,303		10,131		(33,687		)	2,438,747		2,438,747
Corporate:
Industrial	2,295,778		15,355		(53,312		)	2,257,821		2,257,821
Financial	1,502,427		7,178		(45,683		)	1,463,922		1,463,922
Utilities	330,326		2,997		(4,148		)	329,175		329,175
Other	60,238		322		(167		)	60,393		60,393
Total corporate	4,188,769		25,852		(103,310		)	4,111,311		4,111,311
Foreign government	822,093		11,753		(25,111		)	808,735		808,735
Total available for sale	13,596,057		147,683		(215,563		)	13,528,177		13,528,177
Total investments in fixed maturity securities	$	13,674,692	$	160,491	$	(215,563	)	$	13,619,620	$	13,606,812

____________

(1) Gross unrealized losses for residential mortgage-backed securities include $(42,762) and $(55,090) as of June 30, 2019 and December 31, 2018, respectively, related to securities with the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.

The amortized cost and fair value of fixed maturity securities at June 30, 2019, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.

 

(In thousands)	Amortized Cost		Fair Value
Due in one year or less	$	1,017,744	$	1,022,427
Due after one year through five years	4,680,578		4,764,795
Due after five years through ten years	3,226,328		3,347,580
Due after ten years	2,999,301		3,025,841
Mortgage-backed securities	1,555,592		1,586,329
Total	$	13,479,543	$	13,746,972

At June 30, 2019 and December 31, 2018, there were no investments that exceeded 10% of common stockholders' equity, other than investments in United States government and government agency securities.

Equity securities

Debt Securities, Available-for-sale [Line Items]

Investments in Equity Securities

Investments in Equity Securities

At June 30, 2019 and December 31, 2018, investments in equity securities were as follows:

 

(In thousands)	Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2019
Common stocks	$	153,440	$	8,092	$	(21,306	)	$	140,226	$	140,226
Preferred stocks	101,423		180,316		(5,377		)	276,362		276,362
Total	$	254,863	$	188,408	$	(26,683	)	$	416,588	$	416,588
December 31, 2018
Common stocks	$	113,576	$	4,335	$	(19,719	)	$	98,192	$	98,192
Preferred stocks	115,201		72,364		(6,751		)	180,814		180,814
Total	$	228,777	$	76,699	$	(26,470	)	$	279,006	$	279,006

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Arbitrage Trading Account

6 Months Ended

Jun. 30, 2019

Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]

Arbitrage Trading Account

Arbitrage Trading Account

At June 30, 2019 and December 31, 2018, the fair and carrying values of the arbitrage trading account were $533 million and $453 million, respectively. The primary focus of the trading account is merger arbitrage. Merger arbitrage is the business of investing in the securities of publicly held companies which are the targets in announced tender offers and mergers. Arbitrage investing differs from other types of investing in its focus on transactions and events believed likely to bring about a change in value over a relatively short time period (usually four months or less).

The Company uses put options, call options and swap contracts in order to mitigate the impact of potential changes in market conditions on the merger arbitrage trading account. These options and contracts are reported at fair value. As of June 30, 2019, the fair value of long option contracts outstanding was $313 thousand (notional amount of $9.9 million) and the fair value of short option contracts outstanding was $291 thousand (notional amount of $15.6 million). Other than with respect to the use of these trading account securities, the Company does not make use of derivatives.

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Net Investment Income

6 Months Ended

Jun. 30, 2019

Net Investment Income [Abstract]

Net Investment Income

Net Investment Income

Net investment income consists of the following: 

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2019			2018			2019			2018
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	128,903		$	129,665		$	261,022		$	252,911
Investment funds	46,840			12,716			58,251			53,070
Arbitrage trading account	7,199			8,333			17,784			13,524
Real estate	5,174			3,174			9,481			9,742
Equity securities	1,303			559			2,591			1,205
Gross investment income	189,419			154,447			349,129			330,452
Investment expense	(1,086		)	(670		)	(2,542		)	(2,157		)
Net investment income	$	188,333		$	153,777		$	346,587		$	328,295

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Investment Funds

6 Months Ended

Jun. 30, 2019

Equity Method Investments and Joint Ventures [Abstract]

Investment Funds

Investment Funds

The Company evaluates whether it is an investor in a variable interest entity ("VIE"). Such entities do not have sufficient equity at risk to finance their activities without additional subordinated financial support, or the equity investors, as a group, do not have the characteristics of a controlling financial interest (primary beneficiary).  The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose, and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE and on an ongoing basis. The Company is not the primary beneficiary in any of its investment funds, and accordingly, carries its interests in investment funds under the equity method of accounting.

The Company’s maximum exposure to loss with respect to these investments is limited to the carrying amount reported on the Company’s consolidated balance sheet and its unfunded commitments, which were $241 million as of June 30, 2019.

Investment funds consisted of the following:

	Carrying Value as of				Income (Loss) from Investment Funds
	June 30,		December 31,		For the Six Months Ended June 30,
(In thousands)	2019		2018		2019			2018
Real estate	$	654,610	$	642,137	$	13,078		$	35,826
Energy	75,053		75,213		(7,100		)	(1,256		)
Other funds	671,908		615,468		52,273			18,500
Total	$	1,401,571	$	1,332,818	$	58,251		$	53,070

The Company's share of the earnings or losses of investment funds is generally reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.

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Real Estate

6 Months Ended

Jun. 30, 2019

Real Estate [Abstract]

Real Estate

Real Estate

Investment in real estate represents directly owned property held for investment, as follows:

	Carrying Value
	June 30,		December 31,
(In thousands)	2019		2018
Properties in operation	$	1,310,149	$	1,279,584
Properties under development	757,395		677,508
Total	$	2,067,544	$	1,957,092

In 2019, properties in operation included a long-term ground lease in Washington, D.C., a hotel in Memphis, Tennessee, two office complexes in New York City, office buildings in West Palm Beach and Palm Beach, Florida, and an office building in London. Properties in operation are net of accumulated depreciation and amortization of $55,515,000 and $46,250,000 as of June 30, 2019 and December 31, 2018, respectively. Related depreciation expense was $8,931,000 and $10,784,000 for the six months ended June 30, 2019 and 2018, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $32,963,388 in 2019, $66,249,918 in 2020, $68,157,589 in 2021, $71,308,839 in 2022, $64,897,648 in 2023, $62,673,400 in 2024 and $666,203,503 thereafter.

The Company borrowed $101,750,000 through a non-recourse loan secured by the West Palm Beach office building in 2018. The loan matures in November 2028 and carries a fixed interest rate of 4.21%. The carrying value does not reflect the outstanding financing, but rather is reflected within senior notes and other debt on the Company's consolidated balance sheet.

A mixed-use project in Washington, D.C. has been under development in 2018 and 2019.

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Loans Receivable

6 Months Ended

Jun. 30, 2019

Receivables [Abstract]

Loans Receivable

Loans Receivable

Loans receivable are as follows:

(In thousands)	June 30, 2019			December 31, 2018
Amortized cost (net of valuation allowance):
Real estate loans	$	61,830		$	62,289
Commercial loans	32,867			32,524
Total	$	94,697		$	94,813
Fair value:
Real estate loans	$	62,536		$	63,047
Commercial loans	34,369			34,026
Total	$	96,905		$	97,073
Valuation allowance:
Specific	$	341		$	1,200
General	1,949			2,183
Total	$	2,290		$	3,383
	For the Three Months Ended June 30,
	2019			2018
Change in valuation allowance	$	(1,093	)	$	—
	For the Six Months Ended June 30,
	2019			2018
Change in valuation allowance	$	(1,093	)	$	—

Loans receivable in non-accrual status were $0.4 million and $1.2 million as of June 30, 2019 and December 31, 2018.

The Company monitors the performance of its loans receivable and assesses the ability of the borrower to pay principal and interest based upon loan structure, underlying property values, cash flow and related financial and operating performance of the property and market conditions. Loans receivable with a potential for default are further assessed using discounted cash flow analysis and comparable cost and sales methodologies, if appropriate.

The real estate loans are secured by commercial real estate primarily located in New York. These loans generally earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025. The commercial loans are with small business owners who have secured the related financing with the assets of the business. Commercial loans primarily earn interest on a fixed basis and have varying maturities generally not exceeding 10 years.

In evaluating the real estate loans, the Company considers their credit quality indicators, including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower’s financial condition and performance with respect to loan terms, the position in the capital structure, the overall leverage in the capital structure and other market conditions. Based on these considerations, none of the real estate loans were considered to be impaired at June 30, 2019, and accordingly, the Company determined that a specific valuation allowance was not required.

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Realized And Unrealized Investment Gains (Losses) on Investments

6 Months Ended

Jun. 30, 2019

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized And Unrealized Investment Gains (Losses) on Investments

Net Realized and Unrealized Gains (Losses) on Investments

 Net realized and unrealized gains (losses) on investments are as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2019			2018			2019			2018
Net realized and unrealized gains (losses) on investments in earnings
Fixed maturity securities:
Gains	$	3,157		$	7,921		$	8,403		$	21,260
Losses	(3,377		)	(4,125		)	(6,895		)	(7,865		)
Equity securities (1):
Net realized (losses) gains on investment sales	(6		)	119,422			23,339			241,743
Change in unrealized gains (losses)	69,418			(54,652		)	111,496			(148,857		)
Investment funds	41			(353		)	58			(234		)
Real estate	3,021			(402		)	5,767			7,596
Loans receivable	—			1			(970		)	2,059
Other	1,320			1,819			1,028			2,393
Net realized and unrealized gains on investments in earnings before OTTI	73,574			69,631			142,226			118,095
Other-than-temporary impairments	—			—			—			—
Net realized and unrealized gains on investments in earnings	73,574			69,631			142,226			118,095
Income tax expense	(15,451		)	(14,623		)	(29,867		)	(24,800		)
After-tax net realized and unrealized gains on investments in earnings	$	58,123		$	55,008		$	112,359		$	93,295

Change in unrealized investment gains (losses) of available for sale securities:
Fixed maturity securities	$	146,629		$	(36,848	)	$	321,123		$	(196,575	)
Previously impaired fixed maturity securities	81			(2		)	12			11
Investment funds	361			(3,638		)	(4,804		)	(4,772		)
Total change in unrealized investment gains (losses)	147,071			(40,488		)	316,331			(201,336		)
Income tax (expense) benefit	(28,422		)	8,118			(71,907		)	43,194
Noncontrolling interests	30			37			(18		)	26
After-tax change in unrealized investment gains (losses) of available for sale securities	$	118,679		$	(32,333	)	$	244,406		$	(158,116	)

______________________

(1) The net realized gains or losses on investment sales represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains consists of two components: (i) the reversal of the gain or loss recognized in previous periods on equity securities sold and (ii) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.

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Fixed Maturity Securities In An Unrealized Loss Position

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Fixed Maturity Securities In An Unrealized Loss Position

Fixed Maturity Securities in an Unrealized Loss Position

The following tables summarize all fixed maturity securities in an unrealized loss position at June 30, 2019 and December 31, 2018 by the length of time those securities have been continuously in an unrealized loss position:

	Less Than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
June 30, 2019
U.S. government and government agency	$	6,175	$	37	$	92,729	$	1,381	$	98,904	$	1,418
State and municipal	64,499		838		270,454		3,083		334,953		3,921
Mortgage-backed securities	23,049		112		334,887		5,584		357,936		5,696
Asset-backed securities	1,010,706		17,410		572,110		10,297		1,582,816		27,707
Corporate	139,627		1,095		328,409		12,549		468,036		13,644
Foreign government	140,589		18,942		73,967		4,417		214,556		23,359
Fixed maturity securities	$	1,384,645	$	38,434	$	1,672,556	$	37,311	$	3,057,201	$	75,745
December 31, 2018
U.S. government and government agency	$	195,359	$	933	$	130,815	$	3,977	$	326,174	$	4,910
State and municipal	701,700		6,874		744,905		17,738		1,446,605		24,612
Mortgage-backed securities	334,063		2,911		712,595		21,022		1,046,658		23,933
Asset-backed securities	1,687,665		28,965		342,855		4,722		2,030,520		33,687
Corporate	1,730,513		54,181		954,763		49,129		2,685,276		103,310
Foreign government	246,273		24,197		80,004		914		326,277		25,111
Fixed maturity securities	$	4,895,573	$	118,061	$	2,965,937	$	97,502	$	7,861,510	$	215,563

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at June 30, 2019 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Foreign government	12	$	114,714	$	22,719
Corporate	11	65,905		3,278
Asset-backed securities	7	10,412		1,344
Mortgage-backed securities	4	7,170		63
Total	34	$	198,201	$	27,404

For OTTI of fixed maturity securities that management does not intend to sell or to be required to sell, the portion of the decline in value that is considered to be due to credit factors is recognized in earnings, and the portion of the decline in value that is considered to be due to non-credit factors is recognized in other comprehensive income.

     The Company has evaluated its fixed maturity securities in an unrealized loss position and believes the unrealized losses are due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default under financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due and does not consider any of these securities to be OTTI.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company’s fixed maturity available for sale securities, equity securities and its arbitrage trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:

Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.

Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.

Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.

If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.

For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.

The following tables present the assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
June 30, 2019
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	777,070	$	—	$	777,070	$	—
State and municipal	3,747,823		—		3,747,823		—
Mortgage-backed securities	1,575,866		—		1,575,866		—
Asset-backed securities	2,701,785		—		2,701,760		25
Corporate	4,036,285		—		4,036,285		—
Foreign government	815,424		—		815,424		—
Total fixed maturity securities available for sale	13,654,253		—		13,654,228		25
Equity securities:
Common stocks	140,226		131,242		—		8,984
Preferred stocks	276,362		—		272,426		3,936
Total equity securities	416,588		131,242		272,426		12,920
Arbitrage trading account	533,442		424,030		83,206		26,206
Total	$	14,604,283	$	555,272	$	14,009,860	$	39,151
Liabilities:
Trading account securities sold but not yet purchased	$	159,349	$	144,420	$	213	$	14,716
December 31, 2018
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	702,240	$	—	$	702,240	$	—
State and municipal	3,872,598		—		3,872,598		—
Mortgage-backed securities	1,594,546		—		1,594,546		—
Asset-backed securities	2,438,747		—		2,438,648		99
Corporate	4,111,311		—		4,111,311		—
Foreign government	808,735		—		808,735		—
Total fixed maturity securities available for sale	13,528,177		—		13,528,078		99
Equity securities:
Common stocks	98,192		89,596		—		8,596
Preferred stocks	180,814		—		176,869		3,945
Total equity securities	279,006		89,596		176,869		12,541
Arbitrage trading account	452,548		353,335		81,905		17,308
Total	$	14,259,731	$	442,931	$	13,786,852	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	38,120	$	37,327	$	—	$	793

The following tables summarize changes in Level 3 assets and liabilities for the six months ended June 30, 2019 and for the year ended December 31, 2018:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Loss)		Impairments		Purchases		(Sales)			Paydowns / Maturities		Transfers In / (Out)		Ending Balance
Six Months Ended June 30, 2019
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	99	$	2		$	46	$	—	$	—	$	(122	)	$	—	$	—	$	25
Total	99		2			46		—		—		(122		)	—		—		25
Equity securities:
Common stocks	8,596		388			—		—		—		—			—		—		8,984
Preferred stocks	3,945		(9		)	—		—		—		—			—		—		3,936
Total	12,541		379			—		—		—		—			—		—		12,920
Arbitrage trading account	17,308		409			—		—		14,672		(21,072		)	—		14,889		26,206
Total	$	29,948	$	790		$	46	$	—	$	14,672	$	(21,194	)	$	—	$	14,889	$	39,151
Liabilities:
Trading account securities sold but not yet purchased	$	793	$	9,320		$	—	$	—	$	7,609	$	(3,006	)	$	—	$	—	$	14,716
Year Ended December 31, 2018
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	172	$	(2	)	$	46	$	—	$	—	$	(117	)	$	—	$	—	$	99
Total	172		(2		)	46		—		—		(117		)	—		—		99
Equity securities:
Common stocks	9,370		(548		)	—		—		—		(227		)	—		1		8,596
Preferred stocks	10,843		100			—		—				(6,998		)	—		—		3,945
Total	20,213		(448		)	—		—		—		(7,225		)	—		1		12,541
Arbitrage trading account	—		(6		)	—		—		11,523		(11		)	—		5,802		17,308
Total	$	20,385	$	(456	)	$	46	$	—	$	11,523	$	(7,353	)	$	—	$	5,803	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	(67	)	$	—	$	—	$	860	$	—		$	—	$	—	$	793

Transfers into Level 3 represent cases where a publicly traded price was no longer available for a particular investment.

Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:

	June 30, 2019				December 31, 2018
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	13,732,800	$	13,746,972	$	13,606,812	$	13,619,620
Equity securities	416,588		416,588		279,006		279,006
Arbitrage trading account	533,442		533,442		452,548		452,548
Loans receivable	94,697		96,905		94,813		97,073
Cash and cash equivalents	1,258,174		1,258,174		817,602		817,602
Trading account receivables from brokers and clearing organizations	402,361		402,361		347,228		347,228
Liabilities:
Due to broker	39,230		39,230		20,144		20,144
Trading account securities sold but not yet purchased	159,349		159,349		38,120		38,120
Subordinated debentures	907,866		969,172		907,491		840,002
Senior notes and other debt	1,873,799		2,019,430		1,882,028		1,968,996

The estimated fair values of the Company’s fixed maturity securities, equity securities and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 15. The fair value of loans receivable are estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

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Reserves for Loss and Loss Expenses

6 Months Ended

Jun. 30, 2019

Insurance [Abstract]

Reserves for Loss and Loss Expenses

Reserves for Loss and Loss Expenses

The Company's reserves for losses and loss expenses are comprised of case reserves and incurred but not reported liabilities ("IBNR"). When a claim is reported, a case reserve is established for the estimated ultimate payment based upon known information about the claim. As more information about the claim becomes available over time, case reserves are adjusted up or down as appropriate. Reserves are also established on an aggregate basis to provide for IBNR liabilities and expected loss reserve development on reported claims.

Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each operating unit. These methods include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each operating unit.

The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions.

The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is priced and written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each operating unit. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are discounted to their estimated present value based upon such estimated payout patterns.

Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.

Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of businesses with short reporting lags than for lines of business with long reporting lags.

The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed.

The table below provides a reconciliation of the beginning and ending reserve balances:

	June 30,
(In thousands)	2019			2018
Net reserves at beginning of period	$	10,248,883		$	10,056,914
Net provision for losses and loss expenses:
Claims occurring during the current year (1)	1,980,138			1,916,140
Increase (decrease) in estimates for claims occurring in prior years (2) (3)	16,764			(246		)
Loss reserve discount accretion	20,577			20,962
Total	2,017,479			1,936,856
Net payments for claims:
Current year	548,589			316,567
Prior years	1,200,906			1,527,522
Total	1,749,495			1,844,089
Foreign currency translation	(2,228		)	(72,351		)
Net reserves at end of period	10,514,639			10,077,330
Ceded reserves at end of period	1,805,639			1,659,245
Gross reserves at end of period	$	12,320,278		$	11,736,575

_______________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $11 million and $13 million for the six months ended June 30, 2019 and 2018.

(2) The change in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years increased by $9 million and decreased by $6 million for the six months ended June 30, 2019 and 2018, respectively.

(3) For certain retrospectively rated insurance policies and reinsurance agreements, reserve development is offset by additional or return premiums. Favorable development, net of additional and return premiums, was $14 million and $19 million for the six months ended June 30, 2019 and 2018, respectively.

During the six months ended June 30, 2019, favorable prior year development (net of additional and return premiums) of $13.6 million included $17.2 million of favorable development for the Insurance segment, offset by $3.6 million of adverse development for the Reinsurance & Monoline Excess segment.

The overall favorable development for the Insurance segment was primarily attributable to favorable development on workers’ compensation business, partially offset by adverse development on other liability business, commercial auto liability business, and medical malpractice business. The favorable workers’ compensation development was spread across many accident years, including prior to 2009, but was most significant in accident years 2015 through 2018. The favorable workers’ compensation development reflects a continuation of the benign loss cost trends experienced during recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure). The adverse other liability development was mainly related to accident years 2014 through 2016. It was driven by a higher than expected number of large losses being reported in the period, including both general liability and professional liability losses. The adverse commercial auto liability development was primarily related to accident year 2018, and was driven by a higher than expected number of large losses. The adverse medical malpractice development was primarily related to accident years 2013 through 2016, and stemmed from a discontinued book of business at one of our profit centers.

The adverse development for the Reinsurance & Monoline Excess segment was mainly driven by U.S. casualty facultative business from accident years 2009 and prior related to construction projects.

During the six months ended June 30, 2018, favorable prior year development (net of additional and return premiums) of $19.3 million included $18.6 million of favorable development for the Insurance segment, and $0.7 million of favorable development for the Reinsurance & Monoline Excess segment. The favorable development for the Insurance segment was primarily attributable to workers’ compensation business. The favorable workers’ compensation development was spread across many accident years, including prior to 2008, but was most significant in accident years 2015 through 2017. The favorable workers’ compensation development reflects a continuation of the benign loss cost trends experienced in recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure).

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Fair Value Of Financial Instruments

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Of Financial Instruments

Fair Value Measurements

The Company’s fixed maturity available for sale securities, equity securities and its arbitrage trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:

Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.

Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.

Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.

If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.

For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.

The following tables present the assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
June 30, 2019
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	777,070	$	—	$	777,070	$	—
State and municipal	3,747,823		—		3,747,823		—
Mortgage-backed securities	1,575,866		—		1,575,866		—
Asset-backed securities	2,701,785		—		2,701,760		25
Corporate	4,036,285		—		4,036,285		—
Foreign government	815,424		—		815,424		—
Total fixed maturity securities available for sale	13,654,253		—		13,654,228		25
Equity securities:
Common stocks	140,226		131,242		—		8,984
Preferred stocks	276,362		—		272,426		3,936
Total equity securities	416,588		131,242		272,426		12,920
Arbitrage trading account	533,442		424,030		83,206		26,206
Total	$	14,604,283	$	555,272	$	14,009,860	$	39,151
Liabilities:
Trading account securities sold but not yet purchased	$	159,349	$	144,420	$	213	$	14,716
December 31, 2018
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	702,240	$	—	$	702,240	$	—
State and municipal	3,872,598		—		3,872,598		—
Mortgage-backed securities	1,594,546		—		1,594,546		—
Asset-backed securities	2,438,747		—		2,438,648		99
Corporate	4,111,311		—		4,111,311		—
Foreign government	808,735		—		808,735		—
Total fixed maturity securities available for sale	13,528,177		—		13,528,078		99
Equity securities:
Common stocks	98,192		89,596		—		8,596
Preferred stocks	180,814		—		176,869		3,945
Total equity securities	279,006		89,596		176,869		12,541
Arbitrage trading account	452,548		353,335		81,905		17,308
Total	$	14,259,731	$	442,931	$	13,786,852	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	38,120	$	37,327	$	—	$	793

The following tables summarize changes in Level 3 assets and liabilities for the six months ended June 30, 2019 and for the year ended December 31, 2018:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Loss)		Impairments		Purchases		(Sales)			Paydowns / Maturities		Transfers In / (Out)		Ending Balance
Six Months Ended June 30, 2019
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	99	$	2		$	46	$	—	$	—	$	(122	)	$	—	$	—	$	25
Total	99		2			46		—		—		(122		)	—		—		25
Equity securities:
Common stocks	8,596		388			—		—		—		—			—		—		8,984
Preferred stocks	3,945		(9		)	—		—		—		—			—		—		3,936
Total	12,541		379			—		—		—		—			—		—		12,920
Arbitrage trading account	17,308		409			—		—		14,672		(21,072		)	—		14,889		26,206
Total	$	29,948	$	790		$	46	$	—	$	14,672	$	(21,194	)	$	—	$	14,889	$	39,151
Liabilities:
Trading account securities sold but not yet purchased	$	793	$	9,320		$	—	$	—	$	7,609	$	(3,006	)	$	—	$	—	$	14,716
Year Ended December 31, 2018
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	172	$	(2	)	$	46	$	—	$	—	$	(117	)	$	—	$	—	$	99
Total	172		(2		)	46		—		—		(117		)	—		—		99
Equity securities:
Common stocks	9,370		(548		)	—		—		—		(227		)	—		1		8,596
Preferred stocks	10,843		100			—		—				(6,998		)	—		—		3,945
Total	20,213		(448		)	—		—		—		(7,225		)	—		1		12,541
Arbitrage trading account	—		(6		)	—		—		11,523		(11		)	—		5,802		17,308
Total	$	20,385	$	(456	)	$	46	$	—	$	11,523	$	(7,353	)	$	—	$	5,803	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	(67	)	$	—	$	—	$	860	$	—		$	—	$	—	$	793

Transfers into Level 3 represent cases where a publicly traded price was no longer available for a particular investment.

Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:

	June 30, 2019				December 31, 2018
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	13,732,800	$	13,746,972	$	13,606,812	$	13,619,620
Equity securities	416,588		416,588		279,006		279,006
Arbitrage trading account	533,442		533,442		452,548		452,548
Loans receivable	94,697		96,905		94,813		97,073
Cash and cash equivalents	1,258,174		1,258,174		817,602		817,602
Trading account receivables from brokers and clearing organizations	402,361		402,361		347,228		347,228
Liabilities:
Due to broker	39,230		39,230		20,144		20,144
Trading account securities sold but not yet purchased	159,349		159,349		38,120		38,120
Subordinated debentures	907,866		969,172		907,491		840,002
Senior notes and other debt	1,873,799		2,019,430		1,882,028		1,968,996

The estimated fair values of the Company’s fixed maturity securities, equity securities and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 15. The fair value of loans receivable are estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

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Reinsurance

6 Months Ended

Jun. 30, 2019

Insurance [Abstract]

Reinsurance

Reinsurance

The following is a summary of reinsurance financial information:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2019			2018			2019			2018
Written premiums:
Direct	$	1,883,032		$	1,785,266		$	3,712,847		$	3,572,501
Assumed	206,828			162,808			423,243			354,995
Ceded	(346,396		)	(323,970		)	(683,025		)	(638,054		)
Total net premiums written	$	1,743,464		$	1,624,104		$	3,453,065		$	3,289,442
Earned premiums:
Direct	$	1,773,437		$	1,705,277		$	3,497,047		$	3,379,827
Assumed	198,661			180,509			386,852			369,375
Ceded	(325,257		)	(304,733		)	(644,202		)	(600,741		)
Total net premiums earned	$	1,646,841		$	1,581,053		$	3,239,697		$	3,148,461
Ceded losses and loss expenses incurred	$	239,267		$	161,073		$	412,314		$	400,068
Ceded commissions earned	$	73,092		$	65,922		$	144,109		$	132,278

The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. The Company also cedes premiums to state assigned risk plans and captive insurance companies. Estimated amounts due from reinsurers are reported net of reserves for uncollectible reinsurance of $1 million as of both June 30, 2019 and December 31, 2018.

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Restricted Stock Units

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Restricted Stock Units

Restricted Stock Units

Pursuant to its stock incentive plan, the Company may issue restricted stock units ("RSUs") to employees of the Company and its subsidiaries. The RSUs generally vest three to five years from the award date and are subject to other vesting and forfeiture provisions contained in the award agreement. RSUs are expensed pro-ratably over the vesting period. RSU expenses were $25 million and $18 million for the six months ended June 30, 2019 and 2018, respectively. A summary of RSUs issued in the six months ended June 30, 2019 and 2018 follows:

($ in thousands)	Units	Fair Value
2019	5,141	$	308
2018	19,538	$	963

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Litigation and Contingent Liabilities

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Litigation and Contingent Liabilities

Litigation and Contingent Liabilities

In the ordinary course of business, the Company is subject to disputes, litigation and arbitration arising from its insurance and reinsurance businesses. These matters are generally related to insurance and reinsurance claims and are considered in the establishment of loss and loss expense reserves. In addition, the Company may also become involved in legal actions which seek extra-contractual damages, punitive damages or penalties, including claims alleging bad faith in handling of insurance claims. The Company expects its ultimate liability with respect to such matters will not be material to its financial condition. However, adverse outcomes on such matters are possible, from time to time, and could be material to the Company’s results of operations in any particular financial reporting period.

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Leases

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Leases

Leases

As described in note 3, the Company prospectively adopted ASU 2016-02, Leases, for the quarter ended March 31, 2019, which requires lessees to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months on the balance sheet. All leases disclosed within this footnote are classified as operating leases. Recognized right-of-use asset and lease liability are reported within other assets and other liabilities, respectively, in the consolidated balance sheet. Lease expense is reported in other operating costs and expenses in the consolidated statement of income and accounted for on a straight-line basis over the lease term.

To determine the discount rate used to calculate present value of future minimum lease payments, the Company uses its incremental borrowing rate during the lease commencement period in line with the respective lease duration. In certain cases, the Company has the option to renew the lease. Lease renewal future payments are included in the present value of the future minimum lease payments when the Company determines it is reasonably certain to renew.

The main leases entered into by the Company are for office space used by the Company’s operating units across the world. Additionally, the Company, to a lesser extent, has equipment leases mainly for office equipment. Further information relating to operating lease expense and other operating lease information are as follows:

	For the Three Months Ended June 30, 2019		For the Six Months Ended June 30, 2019
(In thousands)
Leases:
Lease cost	$	10,680	$	22,235
Cash paid for amounts included in the measurement of lease liabilities reported in operating cash flows	$	11,132	$	22,789
Right-of-use assets obtained in exchange for new lease liabilities	$	2,918	$	7,884

($ in thousands)	June 30, 2019
Right-of-use assets	$	179,984
Lease liabilities	$	209,107
Weighted-average remaining lease term	6.6 years
Weighted-average discount rate	5.97		%

Contractual maturities of the Company’s future minimum lease payments are as follows:

(In thousands)	June 30, 2019
Contractual Maturities:
2019	$	24,117
2020	44,461
2021	40,681
2022	35,121
2023	31,556
Thereafter	77,578
Total undiscounted future minimum lease payments	253,514
Less: Discount impact	(44,407		)
Total lease liability	$	209,107

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Business Segments

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Business Segments

Business Segments

The Company’s reportable segments include the following two business segments, plus a corporate segment:

• Insurance - predominantly commercial insurance business, including excess and surplus lines, admitted lines and specialty personal lines throughout the United States, as well as insurance business in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia and Australia.

• Reinsurance & Monoline Excess - reinsurance business on a facultative and treaty basis, primarily in the United States, the United Kingdom, Continental Europe, Australia, the Asia-Pacific Region and South Africa, as well as monoline excess business in the United States.

The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Income tax expense and benefits are calculated based upon the Company's overall effective tax rate.

Summary financial information about the Company's reporting segments is presented in the following tables. Income (loss) before income taxes by segment includes allocated investment income. Identifiable assets by segment are those assets used in or allocated to the operation of each segment.

	Revenues
(In thousands)	Earned Premiums (1)		Investment Income		Other		Total (2)		Pre-Tax Income (Loss)			Net Income (Loss) to Common Stockholders
Three months ended June 30, 2019
Insurance	$	1,475,184	$	132,403	$	13,687	$	1,621,274	$	225,871		$	179,241
Reinsurance & Monoline Excess	171,657		44,449		—		216,106		52,635			41,864
Corporate, other and eliminations (3)	—		11,481		100,949		112,430		(78,344		)	(62,519		)
Net realized and unrealized gains on investments	—		—		73,574		73,574		73,574			58,123
Total	$	1,646,841	$	188,333	$	188,210	$	2,023,384	$	273,736		$	216,709
Three months ended June 30, 2018
Insurance	$	1,415,579	$	94,542	$	18,707	$	1,528,828	$	163,181		$	128,693
Reinsurance & Monoline Excess	165,474		41,914		—		207,388		56,174			44,291
Corporate, other and eliminations (3)	—		17,321		87,748		105,069		(59,744		)	(47,917		)
Net realized and unrealized gains on investments	—		—		69,631		69,631		69,631			55,008
Total	$	1,581,053	$	153,777	$	176,086	$	1,910,916	$	229,242		$	180,075
Six months ended June 30, 2019
Insurance	$	2,902,218	$	232,444	$	26,931	$	3,161,593	$	410,387		$	325,234
Reinsurance & Monoline Excess	337,479		84,023		—		421,502		97,490			77,389
Corporate, other and eliminations (3)	—		30,120		204,965		235,085		(146,928		)	(117,551		)
Net realized and unrealized gains on investments	—		—		142,226		142,226		142,226			112,359
Total	$	3,239,697	$	346,587	$	374,122	$	3,960,406	$	503,175		$	397,431
Six Months Ended June 30, 2018
Insurance	$	2,806,868	$	208,040	$	37,675	$	3,052,583	$	362,109		$	286,426
Reinsurance & Monoline Excess	341,593		88,928		—		430,521		100,866			79,838
Corporate, other and eliminations (3)	—		31,327		169,637		200,964		(140,838		)	(113,087		)
Net realized and unrealized gains on investments	—		—		118,095		118,095		118,095			93,295
Total	$	3,148,461	$	328,295	$	325,407	$	3,802,163	$	440,232		$	346,472

_________________

(1)Certain amounts included in earned premiums of each segment are related to inter-segment transactions.

(2)Revenues for Insurance from foreign countries for the three months ended June 30, 2019 and 2018 were $179 million and $176 million, and for the six months ended June 30, 2019 and 2018 were $349 million and $359 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign countries for the three months ended June 30, 2019 and 2018 were $62 million and $55 million, and for the six months ended June 30, 2019 and 2018 were $121 million and $112 million, respectively.

(3) Corporate, other and eliminations represent corporate revenues and expenses that are not allocated to business segments.

Identifiable Assets

(In thousands)	June 30, 2019		December 31, 2018
Insurance	$	19,444,475	$	18,214,293
Reinsurance & Monoline Excess	4,573,446		4,371,151
Corporate, other and eliminations	2,469,982		2,310,533
Consolidated	$	26,487,903	$	24,895,977

Net premiums earned by major line of business are as follows:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
(In thousands)	2019		2018		2019		2018
Insurance:
Other liability	$	505,621	$	474,721	$	996,282	$	938,889
Workers’ compensation	330,510		336,996		657,186		661,974
Short-tail lines (1)	305,852		288,320		594,943		583,347
Commercial automobile	188,278		175,812		369,203		351,010
Professional liability	144,923		139,730		284,604		271,648
Total Insurance	1,475,184		1,415,579		2,902,218		2,806,868
Reinsurance & Monoline Excess:
Casualty reinsurance	95,109		86,841		185,939		177,411
Monoline excess (2)	39,400		40,429		78,381		81,477
Property reinsurance	37,148		38,204		73,159		82,705
Total Reinsurance & Monoline Excess	171,657		165,474		337,479		341,593
Total	$	1,646,841	$	1,581,053	$	3,239,697	$	3,148,461

______________

(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery and other lines.

(2) Monoline excess includes operations that solely retain risk on an excess basis.

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Recent Accounting Pronouncements (Policies)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Per Share Data

Per Share Data

The Company presents both basic and diluted net income per share (“EPS”) amounts. Basic EPS is calculated by dividing net income by the weighted average number of common shares outstanding during the period (including 7,389,781 and 7,270,954 common shares held in a grantor trust as of June 30, 2019 and 2018, respectively). The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since the shares deliverable under vested RSUs were already included in diluted shares outstanding. Diluted EPS is based upon the weighted average number of basic and common equivalent shares outstanding during the period and is calculated using the treasury stock method for stock incentive plans. Common equivalent shares are excluded from the computation in periods in which they have an anti-dilutive effect.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Recently adopted accounting pronouncements:

In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02, Leases, which amends the accounting and disclosure guidance for leases. This guidance retains the two classifications of a lease, as either an operating or finance lease, both of which require lessees to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months. The right-of-use asset and the lease liability are determined based upon the present value of cash flows. Finance leases reflect the financial arrangement by recognizing interest expense on the lease liability separately from the amortization expense of the right-of-use asset. Operating leases recognize lease expense (with no separate recognition of interest expense) on a straight-line basis over the term of the lease. The accounting

by lessors is not significantly changed by the updated guidance. The updated guidance was effective for reporting periods beginning after December 15, 2018. As permitted by the rules, the Company adopted the new guidance prospectively for the quarter ended March 31, 2019. The Company elected to use the practical expedient permitted by the transition guidance which allowed companies to not reassess existing lease classifications for already effective leases. The adoption of this guidance resulted in the recognition of a right-of-use asset of $185 million and a lease liability of $215 million (prior to adoption the Company had a $30 million deferred rent liability recognized) reported within other assets and other liabilities, respectively, in the consolidated balance sheet. The adoption of this guidance did not have an impact on the Company's results of operations or liquidity.

All other accounting and reporting standards that have become effective in 2019 were either not applicable to the Company or their adoption did not have a material impact on the Company. 

Accounting and reporting standards that are not yet effective:

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which amends the accounting guidance for credit losses on financial instruments. The updated guidance amends the current other-than-temporary impairment model for available-for-sale debt securities by requiring the recognition of impairments relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. This guidance also applies a new current expected credit loss model for determining credit-related impairments for financial instruments measured at amortized cost, such as reinsurance recoverables. The updated guidance is effective for reporting periods beginning after December 15, 2019. The Company will not be able to determine the impact the adoption of this guidance will have on its results of operations, financial position or liquidity until the year the guidance becomes effective.

All other recently issued but not yet effective accounting and reporting standards are either not applicable to the Company or are not expected to have a material impact on the Company.

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Per Share Data (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Weighted average number of common shares

The weighted average number of common shares used in the computation of basic and diluted earnings per share was as follows:

	For the Three Months Ended June 30,		For the Six Months Ended June 30,
(In thousands)	2019	2018	2019	2018
Basic	190,512	189,776	190,456	189,669
Diluted	193,059	192,509	192,804	192,284

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Consolidated Statements of Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Components of changes in accumulated other comprehensive income (loss)

The following table presents the components of the changes in accumulated other comprehensive (loss) income ("AOCI"):

(In thousands)	Unrealized Investment Gains (Losses)				Currency Translation Adjustments			Accumulated Other Comprehensive (Loss) Income
As of and for the six months ended June 30, 2019
Changes in AOCI
Beginning of period	$	(91,491	)		$	(418,979	)	$	(510,470	)
Other comprehensive income before reclassifications	245,615				5,268			250,883
Amounts reclassified from AOCI	(1,191		)		—			(1,191		)
Other comprehensive income	244,424				5,268			249,692
Unrealized investment loss related to noncontrolling interest	(18		)		—			(18		)
End of period	$	152,915			$	(413,711	)	$	(260,796	)
Amounts reclassified from AOCI
Pre-tax	$	(1,508	)	(1)	$	—		$	(1,508	)
Tax effect	317			(2)	—			317
After-tax amounts reclassified	$	(1,191	)		$	—		$	(1,191	)
Other comprehensive income
Pre-tax	$	316,331			$	5,268		$	321,599
Tax effect	(71,907		)		—			(71,907		)
Other comprehensive income	$	244,424			$	5,268		$	249,692
As of and for the three months ended June 30, 2019
Changes in AOCI
Beginning of period	$	34,236			$	(399,219	)	$	(364,983	)
Other comprehensive income (loss) before reclassifications	118,475				(14,492		)	103,983
Amounts reclassified from AOCI	174				—			174
Other comprehensive income (loss)	118,649				(14,492		)	104,157
Unrealized investment losses related to noncontrolling interest	30				—			30
Ending balance	$	152,915			$	(413,711	)	$	(260,796	)
Amounts reclassified from AOCI
Pre-tax	$	220		(1)	$	—		$	220
Tax effect	(46		)	(2)	—			(46		)
After-tax amounts reclassified	$	174			$	—		$	174
Other comprehensive income (loss)
Pre-tax	$	147,072			$	(14,492	)	$	132,580
Tax effect	(28,423		)		—			(28,423		)
Other comprehensive income (loss)	$	118,649			$	(14,492	)	$	104,157

_________________________

⁽¹⁾ Net realized and unrealized gains on investments in the consolidated statements of income.

⁽²⁾ Income tax expense in the consolidated statements of income.

(In thousands)	Unrealized Investment Gains (Losses)				Currency Translation Adjustments			Accumulated Other Comprehensive (Loss) Income
As of and for the six months ended June 30, 2018
Changes in AOCI
Beginning of period	$	375,421			$	(306,880	)	$	68,541
Cumulative effect adjustment resulting from changes in accounting principles	(214,539		)		—			(214,539		)
Restated beginning of period	160,882				(306,880		)	(145,998		)
Other comprehensive loss before reclassifications	(147,632		)		(91,656		)	(239,288		)
Amounts reclassified from AOCI	(10,582		)		—			(10,582		)
Other comprehensive loss	(158,214		)		(91,656		)	(249,870		)
Unrealized investment loss related to noncontrolling interest	26				—			26
End of period	$	2,694			$	(398,536	)	$	(395,842	)
Amounts reclassified from AOCI
Pre-tax	$	(13,395	)	(1)	$	—		$	(13,395	)
Tax effect	2,813			(2)	—			2,813
After-tax amounts reclassified	$	(10,582	)		$	—		$	(10,582	)
Other comprehensive loss
Pre-tax	$	(201,336	)		$	(91,656	)	$	(292,992	)
Tax effect	43,122				—			43,122
Other comprehensive loss	$	(158,214	)		$	(91,656	)	$	(249,870	)
As of and for the three months ended June 30, 2018
Changes in AOCI
Beginning of period	$	35,099			$	(294,081	)	$	(258,982	)
Other comprehensive loss before reclassifications	(29,443		)		(104,455		)	(133,898		)
Amounts reclassified from AOCI	(2,999		)		—			(2,999		)
Other comprehensive loss	(32,442		)		(104,455		)	(136,897		)
Unrealized investment loss related to noncontrolling interest	37				—			37
Ending balance	$	2,694			$	(398,536	)	$	(395,842	)
Amounts reclassified from AOCI
Pre-tax	$	(3,796	)	(1)	$	—		$	(3,796	)
Tax effect	797			(2)	—			797
After-tax amounts reclassified	$	(2,999	)		$	—		$	(2,999	)
Other comprehensive loss
Pre-tax	$	(40,488	)		$	(104,455	)	$	(144,943	)
Tax effect	8,046				—			8,046
Other comprehensive loss	$	(32,442	)		$	(104,455	)	$	(136,897	)

_________________________

⁽¹⁾ Net realized and unrealized gains on investments in the consolidated statements of income.

⁽²⁾ Income tax expense in the consolidated statements of income.

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Investments in Fixed Maturity Securities (Tables)

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of investments in fixed maturity securities

At June 30, 2019 and December 31, 2018, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2019
Held to maturity:
State and municipal	$	69,167	$	13,089	$	—		$	82,256	$	69,167
Residential mortgage-backed	9,380		1,083		—			10,463		9,380
Total held to maturity	78,547		14,172		—			92,719		78,547
Available for sale:
U.S. government and government agency	760,247		18,241		(1,418		)	777,070		777,070
State and municipal:
Special revenue	2,322,750		63,204		(2,674		)	2,383,280		2,383,280
State general obligation	320,338		22,108		(43		)	342,403		342,403
Pre-refunded	298,825		19,876		(122		)	318,579		318,579
Corporate backed	238,319		7,065		(639		)	244,745		244,745
Local general obligation	427,233		32,026		(443		)	458,816		458,816
Total state and municipal	3,607,465		144,279		(3,921		)	3,747,823		3,747,823
Mortgage-backed securities:
Residential (1)	1,242,880		28,521		(5,316		)	1,266,085		1,266,085
Commercial	303,332		6,829		(380		)	309,781		309,781
Total mortgage-backed securities	1,546,212		35,350		(5,696		)	1,575,866		1,575,866
Asset-backed	2,719,618		9,874		(27,707		)	2,701,785		2,701,785
Corporate:
Industrial	2,178,339		59,623		(7,755		)	2,230,207		2,230,207
Financial	1,431,612		27,484		(5,373		)	1,453,723		1,453,723
Utilities	312,200		12,548		(426		)	324,322		324,322
Other	27,027		1,096		(90		)	28,033		28,033
Total corporate	3,949,178		100,751		(13,644		)	4,036,285		4,036,285
Foreign government	818,276		20,507		(23,359		)	815,424		815,424
Total available for sale	13,400,996		329,002		(75,745		)	13,654,253		13,654,253
Total investments in fixed maturity securities	$	13,479,543	$	343,174	$	(75,745	)	$	13,746,972	$	13,732,800

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Held to maturity:
State and municipal	$	67,891	$	11,549	$	—		$	79,440	$	67,891
Residential mortgage-backed	10,744		1,259		—			12,003		10,744
Total held to maturity	78,635		12,808		—			91,443		78,635
Available for sale:
U.S. government and government agency	697,931		9,219		(4,910		)	702,240		702,240
State and municipal:
Special revenue	2,396,089		30,507		(19,790		)	2,406,806		2,406,806
State general obligation	335,626		11,951		(1,103		)	346,474		346,474
Pre-refunded	408,141		16,568		(30		)	424,679		424,679
Corporate backed	272,440		4,319		(2,350		)	274,409		274,409
Local general obligation	403,219		18,350		(1,339		)	420,230		420,230
Total state and municipal	3,815,515		81,695		(24,612		)	3,872,598		3,872,598
Mortgage-backed securities:
Residential (1)	1,264,376		7,729		(20,225		)	1,251,880		1,251,880
Commercial	345,070		1,304		(3,708		)	342,666		342,666
Total mortgage-backed securities	1,609,446		9,033		(23,933		)	1,594,546		1,594,546
Asset-backed	2,462,303		10,131		(33,687		)	2,438,747		2,438,747
Corporate:
Industrial	2,295,778		15,355		(53,312		)	2,257,821		2,257,821
Financial	1,502,427		7,178		(45,683		)	1,463,922		1,463,922
Utilities	330,326		2,997		(4,148		)	329,175		329,175
Other	60,238		322		(167		)	60,393		60,393
Total corporate	4,188,769		25,852		(103,310		)	4,111,311		4,111,311
Foreign government	822,093		11,753		(25,111		)	808,735		808,735
Total available for sale	13,596,057		147,683		(215,563		)	13,528,177		13,528,177
Total investments in fixed maturity securities	$	13,674,692	$	160,491	$	(215,563	)	$	13,619,620	$	13,606,812

____________

(1) Gross unrealized losses for residential mortgage-backed securities include $(42,762) and $(55,090) as of June 30, 2019 and December 31, 2018, respectively, related to securities with the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.

Amortized cost and fair value of fixed maturity securities by contractual maturity

The amortized cost and fair value of fixed maturity securities at June 30, 2019, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.

 

(In thousands)	Amortized Cost		Fair Value
Due in one year or less	$	1,017,744	$	1,022,427
Due after one year through five years	4,680,578		4,764,795
Due after five years through ten years	3,226,328		3,347,580
Due after ten years	2,999,301		3,025,841
Mortgage-backed securities	1,555,592		1,586,329
Total	$	13,479,543	$	13,746,972

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Investments in Equity Securities (Tables)

6 Months Ended

Jun. 30, 2019

Equity securities

Debt Securities, Available-for-sale [Line Items]

Schedule of Investments in Equity Securities

At June 30, 2019 and December 31, 2018, investments in equity securities were as follows:

 

(In thousands)	Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2019
Common stocks	$	153,440	$	8,092	$	(21,306	)	$	140,226	$	140,226
Preferred stocks	101,423		180,316		(5,377		)	276,362		276,362
Total	$	254,863	$	188,408	$	(26,683	)	$	416,588	$	416,588
December 31, 2018
Common stocks	$	113,576	$	4,335	$	(19,719	)	$	98,192	$	98,192
Preferred stocks	115,201		72,364		(6,751		)	180,814		180,814
Total	$	228,777	$	76,699	$	(26,470	)	$	279,006	$	279,006

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Net Investment Income (Tables)

6 Months Ended

Jun. 30, 2019

Net Investment Income [Abstract]

Schedule of Net Investment Income

Net investment income consists of the following: 

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2019			2018			2019			2018
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	128,903		$	129,665		$	261,022		$	252,911
Investment funds	46,840			12,716			58,251			53,070
Arbitrage trading account	7,199			8,333			17,784			13,524
Real estate	5,174			3,174			9,481			9,742
Equity securities	1,303			559			2,591			1,205
Gross investment income	189,419			154,447			349,129			330,452
Investment expense	(1,086		)	(670		)	(2,542		)	(2,157		)
Net investment income	$	188,333		$	153,777		$	346,587		$	328,295

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Investment Funds (Tables)

6 Months Ended

Jun. 30, 2019

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Investment Funds

Investment funds consisted of the following:

	Carrying Value as of				Income (Loss) from Investment Funds
	June 30,		December 31,		For the Six Months Ended June 30,
(In thousands)	2019		2018		2019			2018
Real estate	$	654,610	$	642,137	$	13,078		$	35,826
Energy	75,053		75,213		(7,100		)	(1,256		)
Other funds	671,908		615,468		52,273			18,500
Total	$	1,401,571	$	1,332,818	$	58,251		$	53,070

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Real Estate (Tables)

6 Months Ended

Jun. 30, 2019

Real Estate [Abstract]

Schedule of Real Estate Investments

Investment in real estate represents directly owned property held for investment, as follows:

	Carrying Value
	June 30,		December 31,
(In thousands)	2019		2018
Properties in operation	$	1,310,149	$	1,279,584
Properties under development	757,395		677,508
Total	$	2,067,544	$	1,957,092

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Loans Receivable Loans Receivable (Tables)

6 Months Ended

Jun. 30, 2019

Receivables [Abstract]

Schedule of Loans Receivable

Loans receivable are as follows:

(In thousands)	June 30, 2019			December 31, 2018
Amortized cost (net of valuation allowance):
Real estate loans	$	61,830		$	62,289
Commercial loans	32,867			32,524
Total	$	94,697		$	94,813
Fair value:
Real estate loans	$	62,536		$	63,047
Commercial loans	34,369			34,026
Total	$	96,905		$	97,073
Valuation allowance:
Specific	$	341		$	1,200
General	1,949			2,183
Total	$	2,290		$	3,383
	For the Three Months Ended June 30,
	2019			2018
Change in valuation allowance	$	(1,093	)	$	—
	For the Six Months Ended June 30,
	2019			2018
Change in valuation allowance	$	(1,093	)	$	—

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Realized And Unrealized Investment Gains (Losses) on Investments (Tables)

6 Months Ended

Jun. 30, 2019

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized And Unrealized Investment Gains (Losses)

Net realized and unrealized gains (losses) on investments are as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2019			2018			2019			2018
Net realized and unrealized gains (losses) on investments in earnings
Fixed maturity securities:
Gains	$	3,157		$	7,921		$	8,403		$	21,260
Losses	(3,377		)	(4,125		)	(6,895		)	(7,865		)
Equity securities (1):
Net realized (losses) gains on investment sales	(6		)	119,422			23,339			241,743
Change in unrealized gains (losses)	69,418			(54,652		)	111,496			(148,857		)
Investment funds	41			(353		)	58			(234		)
Real estate	3,021			(402		)	5,767			7,596
Loans receivable	—			1			(970		)	2,059
Other	1,320			1,819			1,028			2,393
Net realized and unrealized gains on investments in earnings before OTTI	73,574			69,631			142,226			118,095
Other-than-temporary impairments	—			—			—			—
Net realized and unrealized gains on investments in earnings	73,574			69,631			142,226			118,095
Income tax expense	(15,451		)	(14,623		)	(29,867		)	(24,800		)
After-tax net realized and unrealized gains on investments in earnings	$	58,123		$	55,008		$	112,359		$	93,295

Change in unrealized investment gains (losses) of available for sale securities:
Fixed maturity securities	$	146,629		$	(36,848	)	$	321,123		$	(196,575	)
Previously impaired fixed maturity securities	81			(2		)	12			11
Investment funds	361			(3,638		)	(4,804		)	(4,772		)
Total change in unrealized investment gains (losses)	147,071			(40,488		)	316,331			(201,336		)
Income tax (expense) benefit	(28,422		)	8,118			(71,907		)	43,194
Noncontrolling interests	30			37			(18		)	26
After-tax change in unrealized investment gains (losses) of available for sale securities	$	118,679		$	(32,333	)	$	244,406		$	(158,116	)

______________________

(1) The net realized gains or losses on investment sales represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains consists of two components: (i) the reversal of the gain or loss recognized in previous periods on equity securities sold and (ii) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.

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Fixed Maturity Securities In An Unrealized Loss Position (Tables)

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Securities in an unrealized loss position

The following tables summarize all fixed maturity securities in an unrealized loss position at June 30, 2019 and December 31, 2018 by the length of time those securities have been continuously in an unrealized loss position:

	Less Than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
June 30, 2019
U.S. government and government agency	$	6,175	$	37	$	92,729	$	1,381	$	98,904	$	1,418
State and municipal	64,499		838		270,454		3,083		334,953		3,921
Mortgage-backed securities	23,049		112		334,887		5,584		357,936		5,696
Asset-backed securities	1,010,706		17,410		572,110		10,297		1,582,816		27,707
Corporate	139,627		1,095		328,409		12,549		468,036		13,644
Foreign government	140,589		18,942		73,967		4,417		214,556		23,359
Fixed maturity securities	$	1,384,645	$	38,434	$	1,672,556	$	37,311	$	3,057,201	$	75,745
December 31, 2018
U.S. government and government agency	$	195,359	$	933	$	130,815	$	3,977	$	326,174	$	4,910
State and municipal	701,700		6,874		744,905		17,738		1,446,605		24,612
Mortgage-backed securities	334,063		2,911		712,595		21,022		1,046,658		23,933
Asset-backed securities	1,687,665		28,965		342,855		4,722		2,030,520		33,687
Corporate	1,730,513		54,181		954,763		49,129		2,685,276		103,310
Foreign government	246,273		24,197		80,004		914		326,277		25,111
Fixed maturity securities	$	4,895,573	$	118,061	$	2,965,937	$	97,502	$	7,861,510	$	215,563

Non-Investment Grade Fixed Maturity Securities

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at June 30, 2019 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Foreign government	12	$	114,714	$	22,719
Corporate	11	65,905		3,278
Asset-backed securities	7	10,412		1,344
Mortgage-backed securities	4	7,170		63
Total	34	$	198,201	$	27,404

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair value, On A Recurring Basis

The following tables present the assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
June 30, 2019
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	777,070	$	—	$	777,070	$	—
State and municipal	3,747,823		—		3,747,823		—
Mortgage-backed securities	1,575,866		—		1,575,866		—
Asset-backed securities	2,701,785		—		2,701,760		25
Corporate	4,036,285		—		4,036,285		—
Foreign government	815,424		—		815,424		—
Total fixed maturity securities available for sale	13,654,253		—		13,654,228		25
Equity securities:
Common stocks	140,226		131,242		—		8,984
Preferred stocks	276,362		—		272,426		3,936
Total equity securities	416,588		131,242		272,426		12,920
Arbitrage trading account	533,442		424,030		83,206		26,206
Total	$	14,604,283	$	555,272	$	14,009,860	$	39,151
Liabilities:
Trading account securities sold but not yet purchased	$	159,349	$	144,420	$	213	$	14,716
December 31, 2018
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	702,240	$	—	$	702,240	$	—
State and municipal	3,872,598		—		3,872,598		—
Mortgage-backed securities	1,594,546		—		1,594,546		—
Asset-backed securities	2,438,747		—		2,438,648		99
Corporate	4,111,311		—		4,111,311		—
Foreign government	808,735		—		808,735		—
Total fixed maturity securities available for sale	13,528,177		—		13,528,078		99
Equity securities:
Common stocks	98,192		89,596		—		8,596
Preferred stocks	180,814		—		176,869		3,945
Total equity securities	279,006		89,596		176,869		12,541
Arbitrage trading account	452,548		353,335		81,905		17,308
Total	$	14,259,731	$	442,931	$	13,786,852	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	38,120	$	37,327	$	—	$	793

Summarize Changes In Level 3 Assets

The following tables summarize changes in Level 3 assets and liabilities for the six months ended June 30, 2019 and for the year ended December 31, 2018:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Loss)		Impairments		Purchases		(Sales)			Paydowns / Maturities		Transfers In / (Out)		Ending Balance
Six Months Ended June 30, 2019
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	99	$	2		$	46	$	—	$	—	$	(122	)	$	—	$	—	$	25
Total	99		2			46		—		—		(122		)	—		—		25
Equity securities:
Common stocks	8,596		388			—		—		—		—			—		—		8,984
Preferred stocks	3,945		(9		)	—		—		—		—			—		—		3,936
Total	12,541		379			—		—		—		—			—		—		12,920
Arbitrage trading account	17,308		409			—		—		14,672		(21,072		)	—		14,889		26,206
Total	$	29,948	$	790		$	46	$	—	$	14,672	$	(21,194	)	$	—	$	14,889	$	39,151
Liabilities:
Trading account securities sold but not yet purchased	$	793	$	9,320		$	—	$	—	$	7,609	$	(3,006	)	$	—	$	—	$	14,716
Year Ended December 31, 2018
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	172	$	(2	)	$	46	$	—	$	—	$	(117	)	$	—	$	—	$	99
Total	172		(2		)	46		—		—		(117		)	—		—		99
Equity securities:
Common stocks	9,370		(548		)	—		—		—		(227		)	—		1		8,596
Preferred stocks	10,843		100			—		—				(6,998		)	—		—		3,945
Total	20,213		(448		)	—		—		—		(7,225		)	—		1		12,541
Arbitrage trading account	—		(6		)	—		—		11,523		(11		)	—		5,802		17,308
Total	$	20,385	$	(456	)	$	46	$	—	$	11,523	$	(7,353	)	$	—	$	5,803	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	(67	)	$	—	$	—	$	860	$	—		$	—	$	—	$	793

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Reserves for Loss and Loss Expenses (Tables)

6 Months Ended

Jun. 30, 2019

Insurance [Abstract]

Reserve Balances

The table below provides a reconciliation of the beginning and ending reserve balances:

	June 30,
(In thousands)	2019			2018
Net reserves at beginning of period	$	10,248,883		$	10,056,914
Net provision for losses and loss expenses:
Claims occurring during the current year (1)	1,980,138			1,916,140
Increase (decrease) in estimates for claims occurring in prior years (2) (3)	16,764			(246		)
Loss reserve discount accretion	20,577			20,962
Total	2,017,479			1,936,856
Net payments for claims:
Current year	548,589			316,567
Prior years	1,200,906			1,527,522
Total	1,749,495			1,844,089
Foreign currency translation	(2,228		)	(72,351		)
Net reserves at end of period	10,514,639			10,077,330
Ceded reserves at end of period	1,805,639			1,659,245
Gross reserves at end of period	$	12,320,278		$	11,736,575

_______________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $11 million and $13 million for the six months ended June 30, 2019 and 2018.

(2) The change in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years increased by $9 million and decreased by $6 million for the six months ended June 30, 2019 and 2018, respectively.

(3) For certain retrospectively rated insurance policies and reinsurance agreements, reserve development is offset by additional or return premiums. Favorable development, net of additional and return premiums, was $14 million and $19 million for the six months ended June 30, 2019 and 2018, respectively.

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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Carrying Amounts And Estimated Fair Values Of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:

	June 30, 2019				December 31, 2018
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	13,732,800	$	13,746,972	$	13,606,812	$	13,619,620
Equity securities	416,588		416,588		279,006		279,006
Arbitrage trading account	533,442		533,442		452,548		452,548
Loans receivable	94,697		96,905		94,813		97,073
Cash and cash equivalents	1,258,174		1,258,174		817,602		817,602
Trading account receivables from brokers and clearing organizations	402,361		402,361		347,228		347,228
Liabilities:
Due to broker	39,230		39,230		20,144		20,144
Trading account securities sold but not yet purchased	159,349		159,349		38,120		38,120
Subordinated debentures	907,866		969,172		907,491		840,002
Senior notes and other debt	1,873,799		2,019,430		1,882,028		1,968,996

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Reinsurance (Tables)

6 Months Ended

Jun. 30, 2019

Insurance [Abstract]

Reinsurance Financial Information

The following is a summary of reinsurance financial information:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2019			2018			2019			2018
Written premiums:
Direct	$	1,883,032		$	1,785,266		$	3,712,847		$	3,572,501
Assumed	206,828			162,808			423,243			354,995
Ceded	(346,396		)	(323,970		)	(683,025		)	(638,054		)
Total net premiums written	$	1,743,464		$	1,624,104		$	3,453,065		$	3,289,442
Earned premiums:
Direct	$	1,773,437		$	1,705,277		$	3,497,047		$	3,379,827
Assumed	198,661			180,509			386,852			369,375
Ceded	(325,257		)	(304,733		)	(644,202		)	(600,741		)
Total net premiums earned	$	1,646,841		$	1,581,053		$	3,239,697		$	3,148,461
Ceded losses and loss expenses incurred	$	239,267		$	161,073		$	412,314		$	400,068
Ceded commissions earned	$	73,092		$	65,922		$	144,109		$	132,278

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Restricted Stock Units (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Summary Of Restricted Stock Units Issued

A summary of RSUs issued in the six months ended June 30, 2019 and 2018 follows:

($ in thousands)	Units	Fair Value
2019	5,141	$	308
2018	19,538	$	963

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Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Lease, Cost

Further information relating to operating lease expense and other operating lease information are as follows:

	For the Three Months Ended June 30, 2019		For the Six Months Ended June 30, 2019
(In thousands)
Leases:
Lease cost	$	10,680	$	22,235
Cash paid for amounts included in the measurement of lease liabilities reported in operating cash flows	$	11,132	$	22,789
Right-of-use assets obtained in exchange for new lease liabilities	$	2,918	$	7,884

Supplemental Balance Sheet Information

($ in thousands)	June 30, 2019
Right-of-use assets	$	179,984
Lease liabilities	$	209,107
Weighted-average remaining lease term	6.6 years
Weighted-average discount rate	5.97		%

Maturities of Operating Lease Liabilities

Contractual maturities of the Company’s future minimum lease payments are as follows:

(In thousands)	June 30, 2019
Contractual Maturities:
2019	$	24,117
2020	44,461
2021	40,681
2022	35,121
2023	31,556
Thereafter	77,578
Total undiscounted future minimum lease payments	253,514
Less: Discount impact	(44,407		)
Total lease liability	$	209,107

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Business Segments (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Financial Information Of Company Operating Segments

	Revenues
(In thousands)	Earned Premiums (1)		Investment Income		Other		Total (2)		Pre-Tax Income (Loss)			Net Income (Loss) to Common Stockholders
Three months ended June 30, 2019
Insurance	$	1,475,184	$	132,403	$	13,687	$	1,621,274	$	225,871		$	179,241
Reinsurance & Monoline Excess	171,657		44,449		—		216,106		52,635			41,864
Corporate, other and eliminations (3)	—		11,481		100,949		112,430		(78,344		)	(62,519		)
Net realized and unrealized gains on investments	—		—		73,574		73,574		73,574			58,123
Total	$	1,646,841	$	188,333	$	188,210	$	2,023,384	$	273,736		$	216,709
Three months ended June 30, 2018
Insurance	$	1,415,579	$	94,542	$	18,707	$	1,528,828	$	163,181		$	128,693
Reinsurance & Monoline Excess	165,474		41,914		—		207,388		56,174			44,291
Corporate, other and eliminations (3)	—		17,321		87,748		105,069		(59,744		)	(47,917		)
Net realized and unrealized gains on investments	—		—		69,631		69,631		69,631			55,008
Total	$	1,581,053	$	153,777	$	176,086	$	1,910,916	$	229,242		$	180,075
Six months ended June 30, 2019
Insurance	$	2,902,218	$	232,444	$	26,931	$	3,161,593	$	410,387		$	325,234
Reinsurance & Monoline Excess	337,479		84,023		—		421,502		97,490			77,389
Corporate, other and eliminations (3)	—		30,120		204,965		235,085		(146,928		)	(117,551		)
Net realized and unrealized gains on investments	—		—		142,226		142,226		142,226			112,359
Total	$	3,239,697	$	346,587	$	374,122	$	3,960,406	$	503,175		$	397,431
Six Months Ended June 30, 2018
Insurance	$	2,806,868	$	208,040	$	37,675	$	3,052,583	$	362,109		$	286,426
Reinsurance & Monoline Excess	341,593		88,928		—		430,521		100,866			79,838
Corporate, other and eliminations (3)	—		31,327		169,637		200,964		(140,838		)	(113,087		)
Net realized and unrealized gains on investments	—		—		118,095		118,095		118,095			93,295
Total	$	3,148,461	$	328,295	$	325,407	$	3,802,163	$	440,232		$	346,472

_________________

(1)Certain amounts included in earned premiums of each segment are related to inter-segment transactions.

(2)Revenues for Insurance from foreign countries for the three months ended June 30, 2019 and 2018 were $179 million and $176 million, and for the six months ended June 30, 2019 and 2018 were $349 million and $359 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign countries for the three months ended June 30, 2019 and 2018 were $62 million and $55 million, and for the six months ended June 30, 2019 and 2018 were $121 million and $112 million, respectively.

(3)

Corporate, other and eliminations represent corporate revenues and expenses that are not allocated to business segments

Identifiable Assets By Segment

(In thousands)	June 30, 2019		December 31, 2018
Insurance	$	19,444,475	$	18,214,293
Reinsurance & Monoline Excess	4,573,446		4,371,151
Corporate, other and eliminations	2,469,982		2,310,533
Consolidated	$	26,487,903	$	24,895,977

Net Premiums Earned By Major Line Of Business

Net premiums earned by major line of business are as follows:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
(In thousands)	2019		2018		2019		2018
Insurance:
Other liability	$	505,621	$	474,721	$	996,282	$	938,889
Workers’ compensation	330,510		336,996		657,186		661,974
Short-tail lines (1)	305,852		288,320		594,943		583,347
Commercial automobile	188,278		175,812		369,203		351,010
Professional liability	144,923		139,730		284,604		271,648
Total Insurance	1,475,184		1,415,579		2,902,218		2,806,868
Reinsurance & Monoline Excess:
Casualty reinsurance	95,109		86,841		185,939		177,411
Monoline excess (2)	39,400		40,429		78,381		81,477
Property reinsurance	37,148		38,204		73,159		82,705
Total Reinsurance & Monoline Excess	171,657		165,474		337,479		341,593
Total	$	1,646,841	$	1,581,053	$	3,239,697	$	3,148,461

______________

(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery and other lines.

(2) Monoline excess includes operations that solely retain risk on an excess basis.

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General (Details)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Federal Income Tax Rate	21.00%

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Per Share Data (Narrative) (Details) - shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Weighted average number of shares held in grantor trust	7,389,781	7,270,954

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Per Share Data (Weighted Average Number of Common Shares Used In the Computation of Basic and Diluted Earnings per Share) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Basic (shares)	190,512	189,776	190,456	189,669
Diluted (shares)	193,059	192,509	192,804	192,284

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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use asset	$ 179,984
Operating lease, liability	$ 209,107
Deferred rent liability			$ 30,000
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use asset		$ 185,000
Operating lease, liability		$ 215,000

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Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period				$ 5,479,798
Other comprehensive income (loss)		$ 104,157	$ (136,897)	249,692	$ (249,870)
End of period		6,020,078		6,020,078
Net realized and unrealized gains on investments		73,574	69,631	142,226	118,095
Income before income taxes		273,736	229,242	503,175	440,232
Tax effect		(56,309)	(48,464)	(104,134)	(91,881)
Net income before noncontrolling interests		217,427	180,778	399,041	348,351
Total change in unrealized investment gains (losses)		147,071	(40,488)	316,331	(201,336)
Net change in period		(14,492)	(104,455)	5,268	(91,656)
Other comprehensive income (loss), pre-tax		132,580	(144,943)	321,599	(292,992)
Other comprehensive income (loss), tax effect		(28,423)	8,046	(71,907)	43,122
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	$ 68,541	(364,983)	(258,982)	(510,470)	68,541
Cumulative effect adjustment resulting from changes in accounting principles	(214,539)
Restated beginning of period	(145,998)
Other comprehensive income (loss) before reclassifications		103,983	(133,898)	250,883	(239,288)
Amounts reclassified from AOCI		174	(2,999)	(1,191)	(10,582)
Other comprehensive income (loss)		104,157	(136,897)	249,692	(249,870)
End of period		(260,796)	(395,842)	(260,796)	(395,842)
Unrealized investment loss related to noncontrolling interest		30	37	(18)	26
Accumulated Other Comprehensive Income (Loss) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes		220	(3,796)	(1,508)	(13,395)
Tax effect		(46)	797	317	2,813
Net income before noncontrolling interests		174	(2,999)	(1,191)	(10,582)
Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	375,421	34,236	35,099	(91,491)	375,421
Cumulative effect adjustment resulting from changes in accounting principles	(214,539)
Restated beginning of period	160,882
Other comprehensive income (loss) before reclassifications		118,475	(29,443)	245,615	(147,632)
Amounts reclassified from AOCI		174	(2,999)	(1,191)	(10,582)
Other comprehensive income (loss)		118,649	(32,442)	244,424	(158,214)
End of period		152,915	2,694	152,915	2,694
Unrealized investment loss related to noncontrolling interest		30	37	(18)	26
Total change in unrealized investment gains (losses)		147,072	(40,488)	316,331	(201,336)
Unrealized investment gains, tax effect		(28,423)	8,046	(71,907)	43,122
Unrealized investment gains (losses), after-tax amounts		118,649	(32,442)	244,424	(158,214)
Unrealized Investment Gains (Losses) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net realized and unrealized gains on investments		220	(3,796)	(1,508)	(13,395)
Tax effect		(46)	797	317	2,813
Net income before noncontrolling interests		174	(2,999)	(1,191)	(10,582)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(306,880)	(399,219)	(294,081)	(418,979)	(306,880)
Cumulative effect adjustment resulting from changes in accounting principles	0
Restated beginning of period	$ (306,880)
Other comprehensive income (loss) before reclassifications		(14,492)	(104,455)	5,268	(91,656)
Amounts reclassified from AOCI		0	0	0	0
Other comprehensive income (loss)		(14,492)	(104,455)	5,268	(91,656)
End of period		(413,711)	(398,536)	(413,711)	(398,536)
Unrealized investment loss related to noncontrolling interest		0	0	0	0
Currency translation adjustment, pre-tax		(14,492)	(104,455)	5,268	(91,656)
Currency translation adjustment, tax effect		0	0	0	0
Net change in period		(14,492)	(104,455)	5,268	(91,656)
Currency Translation Adjustments | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes		0	0	0	0
Tax effect		0	0	0	0
Net income before noncontrolling interests		$ 0	$ 0	$ 0	$ 0

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Statements of Cash Flow (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Interest payments	$ 77,672,000	$ 72,878,000
Income taxes paid	$ 82,800,000	$ 111,000,000

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Investments in Fixed Maturity Securities (Investments in fixed maturity securities) (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Total held to maturity, Amortized Cost	$ 78,547,000	$ 78,635,000
Held to maturity, Gross Unrealized Gains	14,172,000	12,808,000
Held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	92,719,000	91,443,000
Total held to maturity, Carrying Value	78,547,000	78,635,000
Total available for sale, Amortized Cost	13,400,996,000	13,596,057,000
Total available for sale, Gross Unrealized Gains	329,002,000	147,683,000
Total available for sale, Gross Unrealized Losses	(75,745,000)	(215,563,000)
Total available for sale, Fair Value	13,654,253,000	13,528,177,000
Total available for sale, Carrying Value	13,654,253,000	13,528,177,000
Total investments in fixed maturity securities, Amortized Value	13,479,543,000	13,674,692,000
Total investments in fixed maturity securities, Gross Unrealized Gains	343,174,000	160,491,000
Total investments in fixed maturity securities, Gross Unrealized Losses	(75,745,000)	(215,563,000)
Total investments in fixed maturity securities, Fair Value	13,746,972,000	13,619,620,000
Total investments in fixed maturity securities, Carrying Value	13,732,800,000	13,606,812,000
State and municipal
Debt Securities, Available-for-sale [Line Items]
Total held to maturity, Amortized Cost	69,167,000	67,891,000
Held to maturity, Gross Unrealized Gains	13,089,000	11,549,000
Held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	82,256,000	79,440,000
Total held to maturity, Carrying Value	69,167,000	67,891,000
Total available for sale, Amortized Cost	3,607,465,000	3,815,515,000
Total available for sale, Gross Unrealized Gains	144,279,000	81,695,000
Total available for sale, Gross Unrealized Losses	(3,921,000)	(24,612,000)
Total available for sale, Fair Value	3,747,823,000	3,872,598,000
Total available for sale, Carrying Value	3,747,823,000	3,872,598,000
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Total held to maturity, Amortized Cost	9,380,000	10,744,000
Held to maturity, Gross Unrealized Gains	1,083,000	1,259,000
Held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	10,463,000	12,003,000
Total held to maturity, Carrying Value	9,380,000	10,744,000
Total available for sale, Amortized Cost	1,242,880,000	1,264,376,000
Total available for sale, Gross Unrealized Gains	28,521,000	7,729,000
Total available for sale, Gross Unrealized Losses	(5,316,000)	(20,225,000)
Total available for sale, Fair Value	1,266,085,000	1,251,880,000
Total available for sale, Carrying Value	1,266,085,000	1,251,880,000
Gross unrealized gains (losses) related to securities	(42,762)	(55,090)
U.S. government and government agency
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	760,247,000	697,931,000
Total available for sale, Gross Unrealized Gains	18,241,000	9,219,000
Total available for sale, Gross Unrealized Losses	(1,418,000)	(4,910,000)
Total available for sale, Fair Value	777,070,000	702,240,000
Total available for sale, Carrying Value	777,070,000	702,240,000
Special revenue
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	2,322,750,000	2,396,089,000
Total available for sale, Gross Unrealized Gains	63,204,000	30,507,000
Total available for sale, Gross Unrealized Losses	(2,674,000)	(19,790,000)
Total available for sale, Fair Value	2,383,280,000	2,406,806,000
Total available for sale, Carrying Value	2,383,280,000	2,406,806,000
State general obligation
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	320,338,000	335,626,000
Total available for sale, Gross Unrealized Gains	22,108,000	11,951,000
Total available for sale, Gross Unrealized Losses	(43,000)	(1,103,000)
Total available for sale, Fair Value	342,403,000	346,474,000
Total available for sale, Carrying Value	342,403,000	346,474,000
Pre-refunded
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	298,825,000	408,141,000
Total available for sale, Gross Unrealized Gains	19,876,000	16,568,000
Total available for sale, Gross Unrealized Losses	(122,000)	(30,000)
Total available for sale, Fair Value	318,579,000	424,679,000
Total available for sale, Carrying Value	318,579,000	424,679,000
Corporate backed
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	238,319,000	272,440,000
Total available for sale, Gross Unrealized Gains	7,065,000	4,319,000
Total available for sale, Gross Unrealized Losses	(639,000)	(2,350,000)
Total available for sale, Fair Value	244,745,000	274,409,000
Total available for sale, Carrying Value	244,745,000	274,409,000
Local general obligation
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	427,233,000	403,219,000
Total available for sale, Gross Unrealized Gains	32,026,000	18,350,000
Total available for sale, Gross Unrealized Losses	(443,000)	(1,339,000)
Total available for sale, Fair Value	458,816,000	420,230,000
Total available for sale, Carrying Value	458,816,000	420,230,000
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	303,332,000	345,070,000
Total available for sale, Gross Unrealized Gains	6,829,000	1,304,000
Total available for sale, Gross Unrealized Losses	(380,000)	(3,708,000)
Total available for sale, Fair Value	309,781,000	342,666,000
Total available for sale, Carrying Value	309,781,000	342,666,000
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	1,546,212,000	1,609,446,000
Total available for sale, Gross Unrealized Gains	35,350,000	9,033,000
Total available for sale, Gross Unrealized Losses	(5,696,000)	(23,933,000)
Total available for sale, Fair Value	1,575,866,000	1,594,546,000
Total available for sale, Carrying Value	1,575,866,000	1,594,546,000
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	2,719,618,000	2,462,303,000
Total available for sale, Gross Unrealized Gains	9,874,000	10,131,000
Total available for sale, Gross Unrealized Losses	(27,707,000)	(33,687,000)
Total available for sale, Fair Value	2,701,785,000	2,438,747,000
Total available for sale, Carrying Value	2,701,785,000	2,438,747,000
Industrial
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	2,178,339,000	2,295,778,000
Total available for sale, Gross Unrealized Gains	59,623,000	15,355,000
Total available for sale, Gross Unrealized Losses	(7,755,000)	(53,312,000)
Total available for sale, Fair Value	2,230,207,000	2,257,821,000
Total available for sale, Carrying Value	2,230,207,000	2,257,821,000
Financial
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	1,431,612,000	1,502,427,000
Total available for sale, Gross Unrealized Gains	27,484,000	7,178,000
Total available for sale, Gross Unrealized Losses	(5,373,000)	(45,683,000)
Total available for sale, Fair Value	1,453,723,000	1,463,922,000
Total available for sale, Carrying Value	1,453,723,000	1,463,922,000
Utilities
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	312,200,000	330,326,000
Total available for sale, Gross Unrealized Gains	12,548,000	2,997,000
Total available for sale, Gross Unrealized Losses	(426,000)	(4,148,000)
Total available for sale, Fair Value	324,322,000	329,175,000
Total available for sale, Carrying Value	324,322,000	329,175,000
Other
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	27,027,000	60,238,000
Total available for sale, Gross Unrealized Gains	1,096,000	322,000
Total available for sale, Gross Unrealized Losses	(90,000)	(167,000)
Total available for sale, Fair Value	28,033,000	60,393,000
Total available for sale, Carrying Value	28,033,000	60,393,000
Corporate
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	3,949,178,000	4,188,769,000
Total available for sale, Gross Unrealized Gains	100,751,000	25,852,000
Total available for sale, Gross Unrealized Losses	(13,644,000)	(103,310,000)
Total available for sale, Fair Value	4,036,285,000	4,111,311,000
Total available for sale, Carrying Value	4,036,285,000	4,111,311,000
Foreign government
Debt Securities, Available-for-sale [Line Items]
Total available for sale, Amortized Cost	818,276,000	822,093,000
Total available for sale, Gross Unrealized Gains	20,507,000	11,753,000
Total available for sale, Gross Unrealized Losses	(23,359,000)	(25,111,000)
Total available for sale, Fair Value	815,424,000	808,735,000
Total available for sale, Carrying Value	$ 815,424,000	$ 808,735,000

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Investments in Fixed Maturity Securities (Amortized cost and fair value of fixed maturity securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 1,017,744
Amortized Cost, Due after one year through five years	4,680,578
Amortized Cost, Due after five years through ten years	3,226,328
Amortized Cost, Due after ten years	2,999,301
Amortized Cost, Mortgaged-backed securities	1,555,592
Total investments in fixed maturity securities, Amortized Value	13,479,543	$ 13,674,692
Fair Value, Due in one year or less	1,022,427
Fair Value, Due after one year through five years	4,764,795
Fair Value, Due after five years through ten years	3,347,580
Fair Value, Due after ten years	3,025,841
Fair Value, Mortgage-backed securities	1,586,329
Total investments in fixed maturity securities, Fair Value	$ 13,746,972	$ 13,619,620

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Investments in Equity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 416,588	$ 279,006
Fair Value
Debt Securities, Available-for-sale [Line Items]
Cost	254,863	228,777
Gross Unrealized, Gains	188,408	76,699
Gross Unrealized, Losses	(26,683)	(26,470)
Equity securities	416,588	279,006
Fair Value | Common stock
Debt Securities, Available-for-sale [Line Items]
Cost	153,440	113,576
Gross Unrealized, Gains	8,092	4,335
Gross Unrealized, Losses	(21,306)	(19,719)
Equity securities	140,226	98,192
Fair Value | Preferred stocks
Debt Securities, Available-for-sale [Line Items]
Cost	101,423	115,201
Gross Unrealized, Gains	180,316	72,364
Gross Unrealized, Losses	(5,377)	(6,751)
Equity securities	276,362	180,814
Carrying Value
Debt Securities, Available-for-sale [Line Items]
Equity securities	416,588	279,006
Carrying Value | Common stock
Debt Securities, Available-for-sale [Line Items]
Equity securities	140,226	98,192
Carrying Value | Preferred stocks
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 276,362	$ 180,814

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Arbitrage Trading Account (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Arbitrage trading account	$ 533,442	$ 452,548
Long | Options held
Derivative [Line Items]
Fair value of derivative	313
Notional amount of derivative	9,900
Short | Options held
Derivative [Line Items]
Fair value of derivative	291
Notional amount of derivative	$ 15,600

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Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Investment Income [Line Items]
Gross investment income	$ 189,419	$ 154,447	$ 349,129	$ 330,452
Investment expense	(1,086)	(670)	(2,542)	(2,157)
Net investment income	188,333	153,777	346,587	328,295
Fixed maturity securities, including cash and cash equivalents and loans receivable
Net Investment Income [Line Items]
Gross investment income	128,903	129,665	261,022	252,911
Investment funds
Net Investment Income [Line Items]
Gross investment income	46,840	12,716	58,251	53,070
Arbitrage trading account
Net Investment Income [Line Items]
Gross investment income	7,199	8,333	17,784	13,524
Real estate
Net Investment Income [Line Items]
Gross investment income	5,174	3,174	9,481	9,742
Equity securities
Net Investment Income [Line Items]
Gross investment income	$ 1,303	$ 559	$ 2,591	$ 1,205

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Investment Funds (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Unfunded commitments		$ 241,000
Investment funds		1,401,571	$ 1,332,818
Income (Loss) from Investment Funds	$ 53,070	58,251
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds		654,610	642,137
Income (Loss) from Investment Funds	35,826	13,078
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds		75,053	75,213
Income (Loss) from Investment Funds	(1,256)	(7,100)
Other funds
Schedule of Equity Method Investments [Line Items]
Investment funds		671,908	$ 615,468
Income (Loss) from Investment Funds	$ 18,500	$ 52,273

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Real Estate (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Real Estate [Abstract]
Properties in operation	$ 1,310,149	$ 1,279,584
Properties under development	757,395	677,508
Total	$ 2,067,544	$ 1,957,092

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Real Estate (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Accumulated depreciation and amortization on properties	$ 55,515,000		$ 46,250,000
Real estate depreciation expense	8,931,000	$ 10,784,000
Lease future minimum payments 2019	32,963,388
Lease future minimum payments 2020	66,249,918
Lease future minimum payments 2021	68,157,589
Lease future minimum payments 2022	71,308,839
Lease future minimum payments 2023	64,897,648
Lease future minimum payments 2024	62,673,400
Lease future minimum payments there after	$ 666,203,503
Secured Debt
Debt Instrument [Line Items]
Fae value of debt			$ 101,750,000,000
Interest rate, percent			4.21%

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Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 94,697		$ 94,697		$ 94,813
Loans receivable	96,905		96,905		97,073
Valuation allowance, specific	341		341		1,200
Valuation allowance, general	1,949		1,949		2,183
Valuation allowance of loans receivable	2,290		2,290		3,383
Change in valuation allowance	(1,093)	$ 0	(1,093)	$ 0
Loans in nonaccrual status	400		400		1,200
Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	61,830		61,830		62,289
Loans receivable	62,536		62,536		63,047
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	32,867		32,867		32,524
Loans receivable	$ 34,369		$ 34,369		$ 34,026

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Realized And Unrealized Investment Gains (Losses) on Investments (Realized and Unrealized Investments Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, gains	$ 3,157	$ 7,921	$ 8,403	$ 21,260
Fixed maturity securities, losses	(3,377)	(4,125)	(6,895)	(7,865)
Net realized (losses) gains on investment sales	(6)	119,422	23,339	241,743
Change in unrealized gains (losses)	69,418	(54,652)	111,496	(148,857)
Investment funds	41	(353)	58	(234)
Real estate	3,021	(402)	5,767	7,596
Loans receivable	0	1	(970)	2,059
Other	1,320	1,819	1,028	2,393
Net realized and unrealized gains on investments in earnings before OTTI	73,574	69,631	142,226	118,095
Other-than-temporary impairments	0	0	0	0
Net realized and unrealized gains on investments in earnings	73,574	69,631	142,226	118,095
Income tax expense	(15,451)	(14,623)	(29,867)	(24,800)
After-tax net realized and unrealized gains on investments in earnings	$ 58,123	$ 55,008	$ 112,359	$ 93,295

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Realized And Unrealized Investment Gains (Losses) on Investments (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment gains (losses)	$ 147,071	$ (40,488)	$ 316,331	$ (201,336)
Income tax (expense) benefit	(28,422)	8,118	(71,907)	43,194
Noncontrolling interests	30	37	(18)	26
Total change in unrealized gains	118,679	(32,333)	244,406	(158,116)
Debt securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment gains (losses)	146,629	(36,848)	321,123	(196,575)
Previously impaired fixed maturity securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment gains (losses)	81	(2)	12	11
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment gains (losses)	$ 361	$ (3,638)	$ (4,804)	$ (4,772)

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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt securities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	$ 1,384,645	$ 4,895,573
Gross Unrealized Losses, Less than 12 Months	38,434	118,061
Fair Value, 12 Months or Greater	1,672,556	2,965,937
Gross Unrealized Losses, 12 Months or Greater	37,311	97,502
Fair Value, Total	3,057,201	7,861,510
Gross Unrealized Losses, Total	75,745	215,563
U.S. government and government agency
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	6,175	195,359
Gross Unrealized Losses, Less than 12 Months	37	933
Fair Value, 12 Months or Greater	92,729	130,815
Gross Unrealized Losses, 12 Months or Greater	1,381	3,977
Fair Value, Total	98,904	326,174
Gross Unrealized Losses, Total	1,418	4,910
State and municipal
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	64,499	701,700
Gross Unrealized Losses, Less than 12 Months	838	6,874
Fair Value, 12 Months or Greater	270,454	744,905
Gross Unrealized Losses, 12 Months or Greater	3,083	17,738
Fair Value, Total	334,953	1,446,605
Gross Unrealized Losses, Total	3,921	24,612
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	23,049	334,063
Gross Unrealized Losses, Less than 12 Months	112	2,911
Fair Value, 12 Months or Greater	334,887	712,595
Gross Unrealized Losses, 12 Months or Greater	5,584	21,022
Fair Value, Total	357,936	1,046,658
Gross Unrealized Losses, Total	5,696	23,933
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	1,010,706	1,687,665
Gross Unrealized Losses, Less than 12 Months	17,410	28,965
Fair Value, 12 Months or Greater	572,110	342,855
Gross Unrealized Losses, 12 Months or Greater	10,297	4,722
Fair Value, Total	1,582,816	2,030,520
Gross Unrealized Losses, Total	27,707	33,687
Corporate
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	139,627	1,730,513
Gross Unrealized Losses, Less than 12 Months	1,095	54,181
Fair Value, 12 Months or Greater	328,409	954,763
Gross Unrealized Losses, 12 Months or Greater	12,549	49,129
Fair Value, Total	468,036	2,685,276
Gross Unrealized Losses, Total	13,644	103,310
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	140,589	246,273
Gross Unrealized Losses, Less than 12 Months	18,942	24,197
Fair Value, 12 Months or Greater	73,967	80,004
Gross Unrealized Losses, 12 Months or Greater	4,417	914
Fair Value, Total	214,556	326,277
Gross Unrealized Losses, Total	$ 23,359	$ 25,111

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Fixed Maturity Securities In An Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) $ in Thousands	Jun. 30, 2019 USD ($) position	Dec. 31, 2018 USD ($)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Aggregate Fair Value	$ 357,936	$ 1,046,658
Corporate
Debt Securities, Available-for-sale [Line Items]
Aggregate Fair Value	468,036	2,685,276
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Aggregate Fair Value	$ 1,582,816	$ 2,030,520
Noninvestment Grade Investments at Loss Position
Debt Securities, Available-for-sale [Line Items]
Number of Securities | position	34
Aggregate Fair Value	$ 198,201
Gross Unrealized Loss	$ 27,404
Noninvestment Grade Investments at Loss Position | Foreign government
Debt Securities, Available-for-sale [Line Items]
Number of Securities | position	12
Aggregate Fair Value	$ 114,714
Gross Unrealized Loss	$ 22,719
Noninvestment Grade Investments at Loss Position | Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Number of Securities | position	4
Aggregate Fair Value	$ 7,170
Gross Unrealized Loss	$ 63
Noninvestment Grade Investments at Loss Position | Corporate
Debt Securities, Available-for-sale [Line Items]
Number of Securities | position	11
Aggregate Fair Value	$ 65,905
Gross Unrealized Loss	$ 3,278
Noninvestment Grade Investments at Loss Position | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Number of Securities | position	7
Aggregate Fair Value	$ 10,412
Gross Unrealized Loss	$ 1,344

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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Total fixed maturity securities available for sale	$ 13,654,253	$ 13,528,177
Equity securities	416,588	279,006
Arbitrage trading account	533,442	452,548
Fair Value, Measurements, Recurring
Assets:
Total fixed maturity securities available for sale	13,654,253	13,528,177
Equity securities	416,588	279,006
Arbitrage trading account	533,442	452,548
Assets, fair value disclosure	14,604,283	14,259,731
Liabilities:
Securities sold but not yet purchased	159,349	38,120
Fair Value, Measurements, Recurring | U.S. government and government agency
Assets:
Total fixed maturity securities available for sale	777,070	702,240
Fair Value, Measurements, Recurring | State and municipal
Assets:
Total fixed maturity securities available for sale	3,747,823	3,872,598
Fair Value, Measurements, Recurring | Mortgage-backed securities
Assets:
Total fixed maturity securities available for sale	1,575,866	1,594,546
Fair Value, Measurements, Recurring | Asset-backed
Assets:
Total fixed maturity securities available for sale	2,701,785	2,438,747
Fair Value, Measurements, Recurring | Corporate
Assets:
Total fixed maturity securities available for sale	4,036,285	4,111,311
Fair Value, Measurements, Recurring | Foreign government
Assets:
Total fixed maturity securities available for sale	815,424	808,735
Fair Value, Measurements, Recurring | Common stocks
Assets:
Equity securities	140,226	98,192
Fair Value, Measurements, Recurring | Preferred stocks
Assets:
Equity securities	276,362	180,814
Level 1 | Fair Value, Measurements, Recurring
Assets:
Total fixed maturity securities available for sale	0	0
Equity securities	131,242	89,596
Arbitrage trading account	424,030	353,335
Assets, fair value disclosure	555,272	442,931
Liabilities:
Securities sold but not yet purchased	144,420	37,327
Level 1 | Fair Value, Measurements, Recurring | U.S. government and government agency
Assets:
Total fixed maturity securities available for sale	0	0
Level 1 | Fair Value, Measurements, Recurring | State and municipal
Assets:
Total fixed maturity securities available for sale	0	0
Level 1 | Fair Value, Measurements, Recurring | Mortgage-backed securities
Assets:
Total fixed maturity securities available for sale	0	0
Level 1 | Fair Value, Measurements, Recurring | Asset-backed
Assets:
Total fixed maturity securities available for sale	0	0
Level 1 | Fair Value, Measurements, Recurring | Corporate
Assets:
Total fixed maturity securities available for sale	0	0
Level 1 | Fair Value, Measurements, Recurring | Foreign government
Assets:
Total fixed maturity securities available for sale	0	0
Level 1 | Fair Value, Measurements, Recurring | Common stocks
Assets:
Equity securities	131,242	89,596
Level 1 | Fair Value, Measurements, Recurring | Preferred stocks
Assets:
Equity securities	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets:
Total fixed maturity securities available for sale	13,654,228	13,528,078
Equity securities	272,426	176,869
Arbitrage trading account	83,206	81,905
Assets, fair value disclosure	14,009,860	13,786,852
Liabilities:
Securities sold but not yet purchased	213	0
Level 2 | Fair Value, Measurements, Recurring | U.S. government and government agency
Assets:
Total fixed maturity securities available for sale	777,070	702,240
Level 2 | Fair Value, Measurements, Recurring | State and municipal
Assets:
Total fixed maturity securities available for sale	3,747,823	3,872,598
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed securities
Assets:
Total fixed maturity securities available for sale	1,575,866	1,594,546
Level 2 | Fair Value, Measurements, Recurring | Asset-backed
Assets:
Total fixed maturity securities available for sale	2,701,760	2,438,648
Level 2 | Fair Value, Measurements, Recurring | Corporate
Assets:
Total fixed maturity securities available for sale	4,036,285	4,111,311
Level 2 | Fair Value, Measurements, Recurring | Foreign government
Assets:
Total fixed maturity securities available for sale	815,424	808,735
Level 2 | Fair Value, Measurements, Recurring | Common stocks
Assets:
Equity securities	0	0
Level 2 | Fair Value, Measurements, Recurring | Preferred stocks
Assets:
Equity securities	272,426	176,869
Level 3 | Fair Value, Measurements, Recurring
Assets:
Total fixed maturity securities available for sale	25	99
Equity securities	12,920	12,541
Arbitrage trading account	26,206	17,308
Assets, fair value disclosure	39,151	29,948
Liabilities:
Securities sold but not yet purchased	14,716	793
Level 3 | Fair Value, Measurements, Recurring | U.S. government and government agency
Assets:
Total fixed maturity securities available for sale	0	0
Level 3 | Fair Value, Measurements, Recurring | State and municipal
Assets:
Total fixed maturity securities available for sale	0	0
Level 3 | Fair Value, Measurements, Recurring | Mortgage-backed securities
Assets:
Total fixed maturity securities available for sale	0	0
Level 3 | Fair Value, Measurements, Recurring | Asset-backed
Assets:
Total fixed maturity securities available for sale	25	99
Level 3 | Fair Value, Measurements, Recurring | Corporate
Assets:
Total fixed maturity securities available for sale	0	0
Level 3 | Fair Value, Measurements, Recurring | Foreign government
Assets:
Total fixed maturity securities available for sale	0	0
Level 3 | Fair Value, Measurements, Recurring | Common stocks
Assets:
Equity securities	8,984	8,596
Level 3 | Fair Value, Measurements, Recurring | Preferred stocks
Assets:
Equity securities	$ 3,936	$ 3,945

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Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, impairments	$ 0	$ 0
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	29,948,000	20,385,000	$ 20,385,000
Assets, earnings	790,000	(456,000)	0
Assets, other comprehensive income	46,000	46,000
Assets, purchases	14,672,000	11,523,000
Assets, (sales)	(21,194,000)	(7,353,000)
Assets. transfers out	14,889,000	5,803,000
Assets, ending balance	39,151,000		29,948,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, beginning balance	793,000	0	0
Liabilities, earnings	9,320,000		(67,000)
Liabilities, other comprehensive income	0		0
Liabilities, impairments	0
Liabilities, purchases	7,609,000		860,000
Liabilities, (sales)	(3,006,000)		0
Liabilities, maturities	0		0
Liabilities, ending balance	14,716,000		793,000
Level 3 | Debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	99,000	172,000	172,000
Assets, earnings	2,000	(2,000)
Assets, other comprehensive income	46,000	46,000
Assets, impairments	0	0
Assets, purchases	0	0
Assets, (sales)	(122,000)	(117,000)
Assets. transfers out	0	0
Assets, ending balance	25,000		99,000
Level 3 | Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	99,000	172,000	172,000
Assets, earnings	2,000	(2,000)
Assets, other comprehensive income	46,000	46,000
Assets, impairments	0	0
Assets, purchases	0	0
Assets, (sales)	(122,000)	(117,000)
Assets, maturities	0	0
Assets. transfers out	0	0
Assets, ending balance	25,000		99,000
Level 3 | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	12,541,000	20,213,000	20,213,000
Assets, earnings	379,000	(448,000)
Assets, other comprehensive income	0	0
Assets, impairments	0	0
Assets, purchases	0	0
Assets, (sales)	0	(7,225,000)
Assets, maturities		0
Assets. transfers out	0	1,000
Assets, ending balance	12,920,000		12,541,000
Level 3 | Common stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	8,596,000	9,370,000	9,370,000
Assets, earnings	388,000	(548,000)
Assets, other comprehensive income	0	0
Assets, impairments	0	0
Assets, purchases	0	0
Assets, (sales)	0	(227,000)
Assets. transfers out	0	1,000
Assets, ending balance	8,984,000		8,596,000
Level 3 | Preferred stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	3,945,000	10,843,000	10,843,000
Assets, earnings	(9,000)	100,000
Assets, other comprehensive income	0	0
Assets, impairments	0	0
Assets, purchases	0
Assets, (sales)	0	(6,998,000)
Assets. transfers out	0	0
Assets, ending balance	3,936,000		3,945,000
Level 3 | Arbitrage trading account
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	17,308,000	0	0
Assets, earnings	409,000	(6,000)
Assets, other comprehensive income	0	0
Assets, impairments	0	0
Assets, purchases	14,672,000	11,523,000
Assets, (sales)	(21,072,000)	(11,000)
Assets. transfers out	14,889,000	$ 5,802,000
Assets, ending balance	26,206,000		17,308,000
Level 3 | Securities Sold, Not yet Purchased [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets. transfers out			$ 0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, transfers out	$ 0

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Reserves for Loss and Loss Expenses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Net reserves at beginning of period	$ 10,248,883	$ 10,056,914
Net provision for losses and loss expenses:
Claims occurring during the current year	1,980,138	1,916,140
Decrease in estimates for claims occurring in prior years	16,764	(246)
Loss reserve discount accretion	20,577	20,962
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	2,017,479	1,936,856
Net payments for claims:
Current year	548,589	316,567
Prior years	1,200,906	1,527,522
Total	1,749,495	1,844,089
Foreign currency translation	(2,228)	(72,351)
Net reserves at end of period	$ 10,248,883	$ 10,056,914	$ 10,514,639	$ 10,248,883	$ 10,077,330
Ceded reserves at end of period			1,805,639		1,659,245
Gross reserves at end of period			$ 12,320,278	$ 11,966,448	$ 11,736,575

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Reserves for Loss and Loss Expenses (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Net of loss reserve discounts	$ 11.0	$ 13.0
Increase (decrease) in estimates for claims	9.0	(6.0)
Adjustment expense	14.0	19.0
Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Adjustment expense	13.6	19.3
Favorable reserve development net of premium offsets	17.2	18.6
Reinsurance & Monoline Excess
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable reserve development net of premium offsets	$ 3.6	$ 0.7

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Fair Value of Financial Instruments (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Arbitrage trading account	$ 533,442	$ 452,548
Loans receivable	96,905	97,073
Carrying Value
Assets:
Fixed maturity securities	13,732,800	13,606,812
Equity securities	416,588	279,006
Arbitrage trading account	533,442	452,548
Loans receivable	94,697	94,813
Cash and cash equivalents	1,258,174	817,602
Trading account receivables from brokers and clearing organizations	402,361	347,228
Liabilities:
Due to broker	39,230	20,144
Trading account securities sold but not yet purchased	159,349	38,120
Subordinated debentures	907,866	907,491
Senior notes and other debt	1,873,799	1,882,028
Fair Value
Assets:
Fixed maturity securities	13,746,972	13,619,620
Equity securities	416,588	279,006
Arbitrage trading account	533,442	452,548
Loans receivable	96,905	97,073
Cash and cash equivalents	1,258,174	817,602
Trading account receivables from brokers and clearing organizations	402,361	347,228
Liabilities:
Due to broker	39,230	20,144
Trading account securities sold but not yet purchased	159,349	38,120
Subordinated debentures	969,172	840,002
Senior notes and other debt	$ 2,019,430	$ 1,968,996

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Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Written premiums:
Written premiums, direct	$ 1,883,032	$ 1,785,266	$ 3,712,847	$ 3,572,501
Written premiums, assumed	206,828	162,808	423,243	354,995
Written premiums, ceded	(346,396)	(323,970)	(683,025)	(638,054)
Total net premiums written	1,743,464	1,624,104	3,453,065	3,289,442
Earned premiums:
Earned premiums, direct	1,773,437	1,705,277	3,497,047	3,379,827
Earned premiums, assumed	198,661	180,509	386,852	369,375
Earned premiums, ceded	(325,257)	(304,733)	(644,202)	(600,741)
Net premiums earned	1,646,841	1,581,053	3,239,697	3,148,461
Ceded losses and loss expenses incurred	239,267	161,073	412,314	400,068
Ceded commissions earned	73,092	$ 65,922	144,109	$ 132,278
Uncollectible reinsurance	$ 1,000		$ 1,000		$ 1,000

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Restricted Stock Units (Summary of Restricted Stock Units Issued) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Share based compensation expense	$ 25,000	$ 18,000
Restricted stock
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Restricted stock units (in units)	5,141	19,538
Fair Value	$ 308	$ 963
Minimum | Restricted stock
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Award vesting period	3 years
Maximum | Restricted stock
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Award vesting period	5 years

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Leases (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Lease cost	$ 10,680	$ 22,235
Cash paid for amounts included in the measurement of lease liabilities reported in operating cash flows	11,132	22,789
Right-of-use assets obtained in exchange for new lease liabilities	$ 2,918	$ 7,884

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Leases (Supplemental Balance Sheet Information) (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease, right-of-use asset	$ 179,984
Operating lease, liability	$ 209,107
Weighted-average remaining lease term	6 years 7 months 6 days
Weighted-average discount rate	5.97%

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Leases (Maturities of Operating Lease Liabilities) (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
Remainder of 2019	$ 24,117
2020	44,461
2021	40,681
2022	35,121
2023	31,556
Thereafter	77,578
Total undiscounted future minimum lease payments	253,514
Less: Discount impact	(44,407)
Total lease liability	$ 209,107

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Business Segments (Financial Information of Company Operating Segments) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Earned Premiums (1)	$ 1,646,841	$ 1,581,053	$ 3,239,697	$ 3,148,461
Investment Income	188,333	153,777	346,587	328,295
Other	188,210	176,086	374,122	325,407
Total revenues	2,023,384	1,910,916	3,960,406	3,802,163
Pre-Tax Income (Loss)	273,736	229,242	503,175	440,232
Net Income (Loss) to Common Stockholders	216,709	180,075	397,431	346,472
Net investment gains	73,574	69,631	142,226	118,095
Net investment gains, net of tax	58,123	55,008	112,359	93,295
Corporate, other and eliminations
Segment Reporting Information [Line Items]
Earned Premiums (1)	0	0	0	0
Investment Income	11,481	17,321	30,120	31,327
Other	100,949	87,748	204,965	169,637
Total revenues	112,430	105,069	235,085	200,964
Pre-Tax Income (Loss)	(78,344)	(59,744)	(146,928)	(140,838)
Net Income (Loss) to Common Stockholders	(62,519)	(47,917)	(117,551)	(113,087)
Insurance
Segment Reporting Information [Line Items]
Earned Premiums (1)	1,475,184	1,415,579	2,902,218	2,806,868
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Earned Premiums (1)	1,475,184	1,415,579	2,902,218	2,806,868
Investment Income	132,403	94,542	232,444	208,040
Other	13,687	18,707	26,931	37,675
Total revenues	1,621,274	1,528,828	3,161,593	3,052,583
Pre-Tax Income (Loss)	225,871	163,181	410,387	362,109
Net Income (Loss) to Common Stockholders	179,241	128,693	325,234	286,426
Reinsurance & Monoline Excess
Segment Reporting Information [Line Items]
Earned Premiums (1)	171,657	165,474	337,479	341,593
Reinsurance & Monoline Excess | Operating Segments
Segment Reporting Information [Line Items]
Earned Premiums (1)	171,657	165,474	337,479	341,593
Investment Income	44,449	41,914	84,023	88,928
Other	0	0	0	0
Total revenues	216,106	207,388	421,502	430,521
Pre-Tax Income (Loss)	52,635	56,174	97,490	100,866
Net Income (Loss) to Common Stockholders	41,864	44,291	77,389	79,838
Re-insurance - International | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	62,000	55,000	121,000	112,000
Net investment gains
Segment Reporting Information [Line Items]
Earned Premiums (1)	0	0	0	0
Investment Income	0	0	0	0
Insurance-International Segment | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	$ 179,000	$ 176,000	$ 349,000	$ 359,000

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Business Segments (Identifiable Assets by Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	$ 26,487,903	$ 24,895,977
Operating Segments | Insurance
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	19,444,475	18,214,293
Operating Segments | Reinsurance & Monoline Excess
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	4,573,446	4,371,151
Corporate, other and eliminations
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	$ 2,469,982	$ 2,310,533

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Business Segments (Net Premiums Earned By Major Line of Business) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from External Customer [Line Items]
Net premiums earned	$ 1,646,841	$ 1,581,053	$ 3,239,697	$ 3,148,461
Insurance
Revenue from External Customer [Line Items]
Net premiums earned	1,475,184	1,415,579	2,902,218	2,806,868
Insurance | Other liability
Revenue from External Customer [Line Items]
Net premiums earned	505,621	474,721	996,282	938,889
Insurance | Workers’ compensation
Revenue from External Customer [Line Items]
Net premiums earned	330,510	336,996	657,186	661,974
Insurance | Property reinsurance
Revenue from External Customer [Line Items]
Net premiums earned	305,852	288,320	594,943	583,347
Insurance | Commercial automobile
Revenue from External Customer [Line Items]
Net premiums earned	188,278	175,812	369,203	351,010
Insurance | Professional liability
Revenue from External Customer [Line Items]
Net premiums earned	144,923	139,730	284,604	271,648
Reinsurance & Monoline Excess
Revenue from External Customer [Line Items]
Net premiums earned	171,657	165,474	337,479	341,593
Reinsurance & Monoline Excess | Property reinsurance
Revenue from External Customer [Line Items]
Net premiums earned	37,148	38,204	73,159	82,705
Reinsurance & Monoline Excess | Casualty reinsurance
Revenue from External Customer [Line Items]
Net premiums earned	95,109	86,841	185,939	177,411
Reinsurance & Monoline Excess | Monoline Excess
Revenue from External Customer [Line Items]
Net premiums earned	$ 39,400	$ 40,429	$ 78,381	$ 81,477