10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended September 30, 2017

or

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

For the transition period from              to

Commission file number 0-15886

The Navigators Group, Inc.

(Exact name of registrant as specified in its charter)

Delaware	13-3138397
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)
400 Atlantic Street, Stamford, Connecticut	06901
(Address of principal executive offices)	(Zip Code)

(203) 905-6090

(Registrant’s telephone number, including area code)

(Former name, former address and former fiscal year, if changed since last report.)

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 and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ☒    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 definition of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check One):

Large accelerated filer	☒	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  ☒

The number of common shares outstanding as of October 27, 2017 was 29,503,221.

THE NAVIGATORS GROUP, INC. AND SUBSIDIARIES

INDEX

Contents

PART I. FINANCIAL INFORMATION	3
Item 1.      Financial Statements	3
Consolidated Balance Sheets – September 30, 2017 (Unaudited) and December 31, 2016	3
Consolidated Statements of Income (Loss) (Unaudited) – Three and Nine Months Ended September 30, 2017 and 2016	4
Consolidated Statements of Comprehensive Income (Loss) (Unaudited) – Three and Nine Months Ended September 30, 2017 and 2016	5
Consolidated Statement of Stockholders’ Equity (Unaudited) –Nine Months Ended September 30, 2017	6
Consolidated Statements of Cash Flows (Unaudited) – Nine Months Ended September 30, 2017 and 2016	7
Notes to Interim Consolidated Financial Statements (Unaudited)	8
Item 2.      Management’s Discussion and Analysis of Financial Condition and Results of Operations	22
Item 3.      Quantitative and Qualitative Disclosures about Market Risk	56
Item 4.      Controls and Procedures	56
PART II. OTHER INFORMATION	57
Item 1.      Legal Proceedings	57
Item 1A.   Risk Factors	57
Item 2.      Unregistered Sales of Equity Securities and Use of Proceeds	57
Item 3.      Defaults Upon Senior Securities	57
Item 4.      Mine Safety Disclosures	57
Item 5.      Other Information	57
Item 6.      Exhibits	58
Signatures	59

2

PART I. FINANCIAL INFORMATION

Item 1.  Financial Statements

THE NAVIGATORS GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	September 30,			December 31,
	2017			2016
amounts in thousands, except per share amounts	(Unaudited)
ASSETS
Investments:
Fixed Maturities, available-for-sale, at fair value (amortized cost: 2017:  $2,752,102;    2016: $2,628,225)	$	2,798,185		$	2,635,882
Equity Securities, available-for-sale, at fair value (cost: 2017: $334,739; 2016: $327,911)		375,876			349,142
Other Invested Assets		1,751			1,960
Short-Term Investments, at fair value (amortized cost: 2017: $247,602; 2016: $143,451)		247,607			143,539
Total Investments	$	3,423,419		$	3,130,523
Cash		56,471			64,643
Premiums Receivable		361,272			306,686
Prepaid Reinsurance Premiums		231,174			213,377
Reinsurance Recoverable on Paid Losses		61,054			82,582
Reinsurance Recoverable on Unpaid Losses and Loss Adjustment Expenses		847,505			779,276
Deferred Policy Acquisition Costs		134,625			119,660
Accrued Investment Income		20,420			17,315
Goodwill and Other Intangible Assets		6,591			6,451
Current Income Tax Receivable, Net		48,186			20,556
Deferred Income Tax, Net		13,080			20,938
Other Assets		71,751			52,030
Total Assets	$	5,275,548		$	4,814,037
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities:
Reserves for Losses and Loss Adjustment Expenses	$	2,558,134		$	2,289,727
Unearned Premiums		990,518			887,344
Reinsurance Balances Payable		129,306			108,980
Senior Notes		263,845			263,728
Payable for Investments Purchased		21,862			—
Accounts Payable and Other Liabilities		87,692			86,070
Total Liabilities	$	4,051,357		$	3,635,849
Stockholders' Equity: (1)
Preferred Stock ($.10 par value per share, authorized 1,000 shares, none issued)	$	—		$	—
Common Stock ($.10 par value per share, authorized 50,000 shares, issued    36,526 shares for 2017 and 36,147 shares for 2016)		3,650			3,612
Additional Paid-In Capital		371,512			373,983
Treasury Stock, at cost (7,023 shares for 2017 and 2016)		(155,801	)		(155,801	)
Retained Earnings		956,290			947,519
Accumulated Other Comprehensive Income		48,540			8,875
Total Stockholders' Equity	$	1,224,191		$	1,178,188
Total Liabilities and Stockholders' Equity	$	5,275,548		$	4,814,037

(1) - We completed a two-for-one stock split on January 20, 2017. All share and per share data prior to January 20, 2017 has beenretroactively restated on a post-split basis.

See accompanying Notes to Interim Consolidated Financial Statements.

3

THE NAVIGATORS GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
amounts in thousands, except  per share amounts	2017			2016			2017			2016
Gross Written Premiums	$	402,038		$	374,930		$	1,304,522		$	1,201,372
Revenues:
Net Written Premiums		296,016			277,001			966,461			903,356
Change in Unearned Premiums		5,339			7,009			(85,140	)		(86,996	)
Net Earned Premiums	$	301,355		$	284,010		$	881,321		$	816,360
Net Investment Income		22,598			19,875			66,311			59,344
Total Other-Than-Temporary Impairment Losses		(957	)		23			(2,005	)		(248	)
Portion of Loss Recognized in Other Comprehensive    Income (Before Tax)		(15	)		(23	)		(60	)		98
Net Other-Than-Temporary Impairment Losses Recognized    in Earnings		(972	)		—			(2,065	)		(150	)
Net Realized Gains		5,190			1,586			7,933			5,143
Other Income (Loss)		(1,699	)		(183	)		(1,042	)		6,796
Total Revenues	$	326,472		$	305,288		$	952,458		$	887,493
Expenses:
Net Losses and Loss Adjustment Expenses	$	276,171		$	172,793		$	622,881		$	492,955
Commission Expenses		45,509			42,611			141,526			120,891
Other Operating Expenses		45,773			56,137			165,077			176,020
Interest Expense		3,862			3,859			11,584			11,575
Total Expenses	$	371,315		$	275,400		$	941,068		$	801,441
Income (Loss) Before Income Taxes	$	(44,843	)	$	29,888		$	11,390		$	86,052
Income Tax Expense (Benefit)		(16,864	)		7,875			(2,243	)		24,917
Net Income (Loss)	$	(27,979	)	$	22,013		$	13,633		$	61,135
Net Income (Loss) per Common Share: (1)
Basic	$	(0.95	)	$	0.76		$	0.46		$	2.10
Diluted	$	(0.95	)	$	0.73		$	0.45		$	2.04
Average Common Shares Outstanding: (1)
Basic		29,500			29,115			29,419			29,058
Diluted		29,500			30,141			30,006			29,997
Cash Dividends Declared per Common Share	$	0.06		$	0.045		$	0.165		$	0.09

(1) - We completed a two-for-one stock split on January 20, 2017. All share and per share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

See accompanying Notes to Interim Consolidated Financial Statements.

4

THE NAVIGATORS GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited)

	Three Months Ended September 30,
amounts in thousands	2017			2016
Net Income (Loss)	$	(27,979	)	$	22,013
Other Comprehensive Income (Loss):
Change in Net Unrealized Gains (Losses) on Investments:
Unrealized Gains (Losses) on Investments arising during the period, net    of Deferred Tax of $(5,197) and $1,300 in 2017 and 2016, respectively		9,653			(2,414	)
Reclassification adjustment for Net Realized Gains included    in Net Income net of Deferred Tax of $881 and $279 in 2017 and    2016, respectively		(1,636	)		(519	)
Change in Net Unrealized Gains (Losses) on Investments	$	8,017		$	(2,933	)
Change in Other-Than-Temporary Impairments
Non Credit Other-Than-Temporary Impairments arising during the period,    net of Deferred Tax of $(6) and $(8) in 2017 and 2016, respectively		9			15
Reclassification Adjustment for Other-Than-Temporary Impairment Credit    Losses Recognized in Net Income net of Deferred Tax of $(193) and $0 in    2017 and 2016, respectively		358			—
Change in Other-Than-Temporary Impairments	$	367		$	15
Change in Foreign Currency Translation Gains (Losses), net of Deferred    Tax of $(691) and $175 in 2017 and 2016, respectively		1,284			(335	)
Other Comprehensive Income (Loss)	$	9,668		$	(3,253	)
Comprehensive Income (Loss)	$	(18,311	)	$	18,760

	Nine Months Ended September 30,
amounts in thousands	2017		2016
Net Income	$	13,633	$	61,135
Other Comprehensive Income (Loss):
Change in Net Unrealized Gains on Investments:
Unrealized Gains on Investments arising during the period, net    of Deferred Tax of $(19,884) and $(23,349) in 2017 and 2016, respectively		36,928		43,362
Reclassification adjustment for Net Realized Losses included    in Net Income net of Deferred Tax of $(72) and $(780) in 2017 and    2016, respectively		134		1,449
Change in Net Unrealized Gains on Investments	$	37,062	$	44,811
Change in Other-Than-Temporary Impairments
Non Credit Other-Than-Temporary Impairments arising during the period,    net of Deferred Tax of $(21) and $34 in 2017 and 2016, respectively		39		(64	)
Reclassification Adjustment for Other-Than-Temporary Impairment Credit    Losses Recognized in Net Income net of Deferred Tax of $(410) and $0 in    2017 and 2016, respectively		761		—
Change in Other-Than-Temporary Impairments	$	800	$	(64	)
Change in Foreign Currency Translation Gains (Losses), net of Deferred    Tax of $(971) and $3,322 in 2017 and 2016, respectively		1,803		(6,174	)
Other Comprehensive Income	$	39,665	$	38,573
Comprehensive Income	$	53,298	$	99,708

See accompanying Notes to Interim Consolidated Financial Statements.

5

THE NAVIGATORS GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited)

					Additional											Accumulated Other		Total
	Common Stock				Paid-in			Treasury Stock					Retained			Comprehensive		Stockholders'
amounts in thousands	Shares(1)		Amount		Capital			Shares(1)		Amount			Earnings			Income (Loss)		Equity
Balance, December 31, 2016		36,147	$	3,612	$	373,983			7,023	$	(155,801	)	$	947,519		$	8,875	$	1,178,188
Net Income		—		—		—			—		—			13,633			—		13,633
Dividends Declared		—		—		—			—		—			(4,862	)		—		(4,862	)
Changes in Comprehensive Income:
Change in Net Unrealized Gain on    Investments		—		—		—			—		—			—			37,062		37,062
Change in Net Non-Credit Other-Than-    Temporary Impairment Losses		—		—		—			—		—			—			800		800
Change in Foreign Currency Translation    Gain		—		—		—			—		—			—			1,803		1,803
Total Comprehensive Income		—		—		—			—		—			—			39,665		39,665
Shares Issued(2)		379		38		(10,831	)		—		—			—			—		(10,793	)
Share-Based Compensation		—		—		8,360			—		—			—			—		8,360
Balance, September 30, 2017		36,526	$	3,650	$	371,512			7,023	$	(155,801	)	$	956,290		$	48,540	$	1,224,191

(1) - We completed a two-for-one stock split on January 20, 2017. All share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

(2) - Includes shares issued under the Second Amended and Restated 2005 Stock Incentive Plan to Directors and the Employee Stock Purchase Plan.

See accompanying Notes to Interim Consolidated Financial Statements.

6

THE NAVIGATORS GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

	Nine Months Ended September 30,
amounts in thousands	2017			2016
Operating Activities:
Net Income	$	13,633		$	61,135
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation & Amortization		3,586			4,214
Share-Based Compensation		8,360			13,929
Deferred Income Taxes		(13,920	)		(7,066	)
Net Realized Gains		(7,933	)		(5,143	)
Net Other-Than-Temporary Impairments Recognized in Earnings		2,065			150
Non-Cash Foreign Exchange (Gains) Losses		441			(6,972	)
Changes in Assets And Liabilities:
Reinsurance Recoverable on Paid and Unpaid Losses and Loss Adjustment    Expenses		(40,786	)		(7,580	)
Reserves for Losses and Loss Adjustment Expenses		251,971			78,577
Prepaid Reinsurance Premiums		(17,797	)		9,697
Unearned Premiums		103,174			77,299
Premiums Receivable		(48,985	)		(49,771	)
Deferred Policy Acquisition Costs		(14,965	)		(24,312	)
Accrued Investment Income		(3,105	)		(839	)
Reinsurance Balances Payable		19,058			18,846
Current Income Tax Receivable, Net		(25,073	)		6,389
Other		(6,973	)		22,747
Net Cash Provided by Operating Activities	$	222,751		$	191,300
Investing Activities:
Fixed Maturities
Redemptions and Maturities	$	233,384		$	207,620
Sales		192,417			370,501
Purchases		(560,018	)		(776,086	)
Equity Securities
Sales		59,673			36,918
Purchases		(61,562	)		(58,405	)
Change in Net Payable for Securities		21,761			41,265
Purchase of Other Invested Assets		—			(2,021	)
Net Change in Short-Term Investments		(100,406	)		84,822
Purchase of Property and Equipment		(2,649	)		(3,571	)
Net Cash Used in Investing Activities	$	(217,400	)	$	(98,957	)
Financing Activities:
Proceeds of Stock Issued From Employee Stock Purchase Plan	$	2,289		$	1,840
Payment of Employee Tax Withholding on Stock Compensation		(13,835	)		(5,081	)
Dividends Paid		(4,862	)		(2,619	)
Net Cash Used in Financing Activities	$	(16,408	)	$	(5,860	)
Effect of Exchange Rate on Cash	$	2,885		$	(8,869	)
Change in Cash	$	(8,172	)	$	77,614
Cash at Beginning of Year		64,643			69,901
Cash at End of Period	$	56,471		$	147,515
Supplemental Information:
Income Taxes Paid, Net	$	39,877		$	24,148
Interest Paid	$	7,619		$	7,619
Issuance of Stock to Directors	$	578		$	633

See accompanying Notes to Interim Consolidated Financial Statements.

7

THE NAVIGATORS GROUP, INC. AND SUBSIDIARIES

Notes to Interim Consolidated Financial Statements (Unaudited)

NOTE 1.  ORGANIZATION & SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Unless the context requires otherwise, the terms “we,” “us,” “our” or “our Company” are used to mean The Navigators Group, Inc., a Delaware holding company established in 1982, and its subsidiaries. The term “Parent Company” is used to mean The Navigators Group, Inc. without its subsidiaries.

Organization

We are an international insurance company with a long-standing area of specialization in Marine insurance. We also offer Property and Casualty (“P&C”) insurance, primarily general liability coverage and umbrella & excess liability coverage to commercial enterprises through our Primary and Excess Casualty divisions. We have also developed niches in Professional Liability insurance, through our Directors & Officers (“D&O”) and Errors & Omissions (“E&O”) divisions, as well as assumed reinsurance products.

We operate through various wholly-owned insurance and service companies. Our subsidiaries domiciled in the United States (“U.S.”) include two insurance companies, Navigators Insurance Company (“NIC”) and Navigators Specialty Insurance Company (“NSIC”), as well as our U.S. underwriting agency, Navigators Management Company (“NMC”). NIC includes a branch in the United Kingdom (“U.K”). We also have operations domiciled in the U.K., Hong Kong and Europe. Navigators International Insurance Company Ltd. (“NIIC”), Navigators Management (U.K.) Ltd. (“NMUK”) and Navigators Underwriting Ltd. (“NUL”) are domiciled in the U.K. and NUL includes European branches. Navigators Underwriting Agency Ltd. (“NUAL”), a Lloyd’s of London (“Lloyd’s”) underwriting agency, manages and provides the capital, through Navigators Corporate Underwriters Ltd. (“NCUL”), for our Lloyd’s Syndicate 1221 (the “Syndicate”), and is also domiciled in the U.K. We control 100% of the Syndicate’s stamp capacity.

Effective January 1, 2017, we sold our underwriting agency operations in Sweden and Denmark. The transaction represented a 100% disposition of our Sweden and Denmark corporations, NUAL AB and Navigators A/S, respectively. This transaction did not have a material impact on our financial statements.

Basis of Presentation

The Consolidated Balance Sheet at September 30, 2017 and the Consolidated Statements of Income (Loss), Comprehensive Income (Loss), Stockholders’ Equity and Cash Flows for the periods ended September 30, 2017 and 2016 are unaudited. The Balance Sheet at December 31, 2016 is derived from our audited Financial Statements. The accompanying Interim Consolidated Financial Statements reflect all adjustments, which, in the opinion of management, are necessary to fairly present the results of our Company for the interim periods presented on the basis of U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X as promulgated by the U.S. Securities and Exchange Commission. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. All significant intercompany transactions and balances have been eliminated in consolidation. The preparation of these Financial Statements 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 reported revenues and expenses during the reporting periods. The results of operations for any interim period are not necessarily indicative of results for the full year. The Interim Consolidated Financial Statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2016. Certain amounts for the prior period have been reclassified to conform with the current period presentation.

Income Taxes

The interim income tax provision has been computed based on our estimated annual Effective Tax Rate, which represents our best estimate on a year to date basis for the interim period. As a result, the tax provision for a given quarter equals the difference between the provision recorded cumulatively year to date less the amount recorded cumulatively as of the end of the prior interim period. Our Effective Tax Rate for the quarter and year to date differs from the federal tax rate of 35% primarily due to an excess tax benefit related to the vesting of stock compensation at fair market value, tax-exempt investment income and dividends received deduction.

Starting in the first quarter of 2017, excess tax benefits related to the vesting of stock compensation were recognized as a reduction to Income Tax Expense rather than as an increase to Additional Paid-In Capital as a result of the adoption of the Accounting Standards Update (“ASU”) 2016-09 (see section New Accounting Standards Adopted in 2017 of this footnote for further information on the adoption of this standard).

8

Significant Accounting Policies

There were no changes in our significant accounting policies subsequent to our Annual Report on Form 10-K for the year ended December 31, 2016.

New Accounting Standards Adopted in 2017

Share-Based Compensation Accounting

Effective January 1, 2017, our Company adopted ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting” issued by the Financial Accounting Standards Board (the “FASB”). This guidance requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled, eliminates the requirement that excess tax benefits be realized before companies can recognize them, requires the presentation of excess tax benefits as an operating activity on the statement of cash flows, allows employers to increase the amounts withheld to cover income taxes on share-based compensation awards without requiring liability classification, requires the presentation of employee taxes paid as a financing activity on the statement of cash flows, and requires companies to elect whether they will account for award forfeitures by recognizing forfeitures only as they occur or by estimating the number of awards expected to be forfeited.

The requirement to recognize all income tax effects of awards in the income statement when the awards vest or are settled was adopted on a prospective basis. Previously, these amounts were recorded in Additional Paid-In Capital. This change also prospectively impacts the calculation of potential common shares used to determine Diluted Net Income per Common Share under the treasury stock method. The new standard requires that assumed proceeds under the treasury stock method be modified to exclude the amount of excess tax benefits that previously would have been recognized in Additional Paid-In Capital.

We elected to account for forfeitures of share-based payment awards by recognizing forfeitures of awards as they occur, and upon adoption of this guidance, the payment of employee taxes was retrospectively adjusted on the Consolidated Statements of Cash Flows to be classified as a financing activity. All other changes in the ASU did not result in cumulative-effect or retrospective adjustments. The adoption of this guidance did not materially impact our results of operations, financial condition or liquidity.

Transition to Equity Method of Accounting

Effective January 1, 2017, our Company adopted the ASU 2016-07, “Simplifying the Transition to the Equity Method of Accounting” issued by the FASB. This guidance eliminates the requirement to retrospectively apply equity method accounting when an investment that had been accounted for by another method initially qualifies for the equity method. Our Company did not have any investments transitioning to the equity method of accounting during the nine months ended September 30, 2017. The adoption of this guidance did not impact our results of operations, financial condition or liquidity.

Share-Based Compensation Modification Accounting

During the second quarter of 2017, our Company early adopted the ASU 2017-09, “Scope of Modification Accounting” issued by the FASB. This guidance clarifies when changes to the terms or conditions of a share-based award must be accounted for as modifications. Under the new guidance, modification accounting is required if the value, vesting conditions or classification of the award changes. This guidance will be applied prospectively to awards modified on or after the adoption date. The adoption of this guidance did not impact our results of operations, financial condition or liquidity.

Recently Issued Accounting Standards Not Yet Adopted

Definition of a Business

In January 2017, the FASB issued ASU 2017-01, “Clarifying the Definition of a Business” with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This guidance is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years with early adoption permitted. This guidance will be applied prospectively to any transactions occurring within the period of adoption.

Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment” that eliminates the requirement to calculate the implied fair value of goodwill (i.e., Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, an impairment charge will be based on the excess of a reporting unit’s carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current goodwill impairment test). This guidance is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019, with early adoption permitted for annual and interim goodwill impairment testing dates after January 1, 2017. This guidance will be adopted on a prospective basis.

9

Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, “Premium Amortization on Purchased Callable Debt Securities” that shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. This guidance is effective for annual periods beginning after December 15, 2018, and interim periods within those fiscal years with early adoption permitted. This guidance will be adopted using a modified retrospective transition approach. The adoption of this guidance is not expected to materially impact our results of operations, financial condition or liquidity.

NOTE 2.  SEGMENT INFORMATION

We report our results of operations consistent with the manner in which our Chief Operating Decision Maker reviews the business to assess performance through our reporting segments: U.S. Insurance, International Insurance (“Int’l Insurance”), Global Reinsurance (“GlobalRe”) and Corporate. 

We classify our business into three underwriting segments: U.S. Insurance, Int’l Insurance and GlobalRe.  Both the U.S. Insurance and Int’l Insurance reporting segments are each comprised of three operating segments: Marine, P&C and Professional Liability.

We evaluate the performance of each of the underwriting segments based on underwriting results.  Underwriting results are measured based on Underwriting Profit or Loss and the related Combined Ratio, which are both measures of underwriting profitability.   Underwriting Profit (Loss) is calculated from Net Earned Premiums less the sum of Net Losses and Loss Adjustment Expenses (“LAE”), Commission Expenses, Other Operating Expenses and Other Underwriting Income (Expense).  The Combined Ratio is derived by dividing the sum of Net Losses and LAE, Commission Expenses, Other Operating Expenses and Other Underwriting Income (Expense) by Net Earned Premiums.  A Combined Ratio of less than 100% indicates an Underwriting Profit and greater than 100% indicates an Underwriting Loss.  Our underwriting performance is evaluated separately from the rest of our operations.  

The performance of our investment portfolios, our liquidity and capital resource needs, our foreign currency exposure and our tax planning strategies are evaluated on a consolidated basis within our Corporate segment. We do not allocate our assets by underwriting segment as we evaluate the underwriting results of these segments separately from the results of our investments portfolio.

Financial data by segment for the three and nine months ended September 30, 2017 and 2016 was as follows:

	Three Months Ended September 30, 2017
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	169,150		$	84,407		$	47,798		$	—		$	301,355
Net Losses and LAE		(135,340	)		(81,713	)		(59,118	)		—			(276,171	)
Commission Expenses		(18,286	)		(16,201	)		(11,233	)		211			(45,509	)
Other Operating Expenses		(25,375	)		(16,388	)		(4,010	)		—			(45,773	)
Other Underwriting Income (Expense)		125			—			94			(211	)		8
Underwriting Loss	$	(9,726	)	$	(29,895	)	$	(26,469	)	$	—		$	(66,090	)
Net Investment Income											22,598			22,598
Net Realized Gains											4,218			4,218
Interest Expense											(3,862	)		(3,862	)
Other Loss											(1,707	)		(1,707	)
Loss Before Income Taxes	$	(9,726	)	$	(29,895	)	$	(26,469	)	$	21,247		$	(44,843	)
Income Tax Benefit											16,864			16,864
Net Loss													$	(27,979	)
Losses and LAE Ratio		80.0	%		96.8	%		123.7	%					91.6	%
Commission Expense Ratio		10.8	%		19.2	%		23.5	%					15.1	%
Other Operating Expense Ratio (2)		14.9	%		19.4	%		8.2	%					15.2	%
Combined Ratio		105.7	%		135.4	%		155.4	%					121.9	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

10

	Three Months Ended September 30, 2016
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	161,722		$	79,761		$	42,527		$	—		$	284,010
Net Losses and LAE		(106,320	)		(45,043	)		(21,430	)		—			(172,793	)
Commission Expenses		(18,630	)		(15,348	)		(8,951	)		318			(42,611	)
Other Operating Expenses		(31,517	)		(20,183	)		(4,437	)		—			(56,137	)
Other Underwriting Income (Expense)		240			—			122			(318	)		44
Underwriting Profit (Loss)	$	5,495		$	(813	)	$	7,831		$	—		$	12,513
Net Investment Income											19,875			19,875
Net Realized Gains											1,586			1,586
Interest Expense											(3,859	)		(3,859	)
Other Loss											(227	)		(227	)
Income (Loss) Before Income Taxes	$	5,495		$	(813	)	$	7,831		$	17,375		$	29,888
Income Tax Expense											(7,875	)		(7,875	)
Net Income													$	22,013
Losses and LAE Ratio		65.7	%		56.5	%		50.4	%					60.8	%
Commission Expense Ratio		11.5	%		19.2	%		21.0	%					15.0	%
Other Operating Expense Ratio (2)		19.4	%		25.3	%		10.2	%					19.8	%
Combined Ratio		96.6	%		101.0	%		81.6	%					95.6	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

	Nine Months Ended September 30, 2017
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	500,241		$	250,593		$	130,487		$	—		$	881,321
Net Losses and LAE		(339,436	)		(176,513	)		(106,932	)		—			(622,881	)
Commission Expenses		(59,130	)		(54,435	)		(28,695	)		734			(141,526	)
Other Operating Expenses		(91,987	)		(58,687	)		(14,403	)		—			(165,077	)
Other Underwriting Income (Expense)		335			—			439			(734	)		40
Underwriting Profit (Loss)	$	10,023		$	(39,042	)	$	(19,104	)	$	—		$	(48,123	)
Net Investment Income											66,311			66,311
Net Realized Gains											5,868			5,868
Interest Expense											(11,584	)		(11,584	)
Other Loss											(1,082	)		(1,082	)
Income (Loss) Before Income Taxes	$	10,023		$	(39,042	)	$	(19,104	)	$	59,513		$	11,390
Income Tax Benefit											2,243			2,243
Net Income													$	13,633
Losses and LAE Ratio		67.9	%		70.4	%		81.9	%					70.7	%
Commission Expense Ratio		11.8	%		21.7	%		22.0	%					16.1	%
Other Operating Expense Ratio (2)		18.3	%		23.5	%		10.7	%					18.7	%
Combined Ratio		98.0	%		115.6	%		114.6	%					105.5	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

11

	Nine Months Ended September 30, 2016
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate(1)			Total
Net Earned Premiums	$	462,446		$	235,602		$	118,312		$	—		$	816,360
Net Losses and LAE		(291,260	)		(133,519	)		(68,176	)		—			(492,955	)
Commission Expenses		(50,379	)		(47,524	)		(24,188	)		1,200			(120,891	)
Other Operating Expenses		(96,848	)		(64,997	)		(14,175	)		—			(176,020	)
Other Underwriting Income (Expense)		943			—			374			(1,200	)		117
Underwriting Profit (Loss)	$	24,902		$	(10,438	)	$	12,147		$	—		$	26,611
Net Investment Income											59,344			59,344
Net Realized Gains											4,993			4,993
Interest Expense											(11,575	)		(11,575	)
Other Income											6,679			6,679
Income (Loss) Before Income Taxes	$	24,902		$	(10,438	)	$	12,147		$	59,441		$	86,052
Income Tax Expense											(24,917	)		(24,917	)
Net Income													$	61,135
Losses and LAE Ratio		63.0	%		56.7	%		57.6	%					60.4	%
Commission Expense Ratio		10.9	%		20.2	%		20.4	%					14.8	%
Other Operating Expense Ratio (2)		20.7	%		27.5	%		11.7	%					21.5	%
Combined Ratio		94.6	%		104.4	%		89.7	%					96.7	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

Revenue by operating segment for the three and nine months ended September 30, 2017 and 2016 was as follows:

	Three Months Ended September 30, 2017									Three Months Ended September 30, 2016									% Change
amounts in thousands	Gross Written Premiums		Ceded Written Premiums			NetWritten Premiums		Net Earned Premiums		Gross Written Premiums		Ceded Written Premiums			Net Written Premiums		Net Earned Premiums		Gross Written Premiums			Ceded Written Premiums			NetWritten Premiums			Net Earned Premiums
U.S. Insurance
Marine	$	36,403	$	(18,859	)	$	17,544	$	20,129	$	40,271	$	(17,636	)	$	22,635	$	25,465		(9.6	%)		6.9	%		(22.5	%)		(21.0	%)
P&C		166,097		(39,952	)		126,145		125,931		161,600		(36,011	)		125,589		115,971		2.8	%		10.9	%		0.4	%		8.6	%
ProfessionalLiability		32,552		(5,517	)		27,035		23,090		32,776		(7,712	)		25,064		20,286		(0.7	%)		(28.5	%)		7.9	%		13.8	%
Total	$	235,052	$	(64,328	)	$	170,724	$	169,150	$	234,647	$	(61,359	)	$	173,288	$	161,722		0.2	%		4.8	%		(1.5	%)		4.6	%
Int'l Insurance
Marine	$	41,689	$	(9,948	)	$	31,741	$	39,038	$	38,453	$	(12,631	)	$	25,822	$	34,794		8.4	%		(21.2	%)		22.9	%		12.2	%
P&C		37,415		(19,772	)		17,643		21,775		38,077		(15,331	)		22,746		25,584		(1.7	%)		29.0	%		(22.4	%)		(14.9	%)
Professional Liability		34,497		(9,246	)		25,251		23,594		27,954		(7,232	)		20,722		19,383		23.4	%		27.8	%		21.9	%		21.7	%
Total	$	113,601	$	(38,966	)	$	74,635	$	84,407	$	104,484	$	(35,194	)	$	69,290	$	79,761		8.7	%		10.7	%		7.7	%		5.8	%
GlobalRe	$	53,385	$	(2,728	)	$	50,657	$	47,798	$	35,799	$	(1,376	)	$	34,423	$	42,527		49.1	%		98.3	%		47.2	%		12.4	%
Total	$	402,038	$	(106,022	)	$	296,016	$	301,355	$	374,930	$	(97,929	)	$	277,001	$	284,010		7.2	%		8.3	%		6.9	%		6.1	%

	Nine Months Ended September 30, 2017									Nine Months Ended September 30, 2016									% Change
amounts in thousands	Gross Written Premiums		Ceded Written Premiums			NetWritten Premiums		Net Earned Premiums		Gross Written Premiums		Ceded Written Premiums			NetWritten Premiums		Net Earned Premiums		Gross Written Premiums			Ceded Written Premiums			NetWritten Premiums			Net Earned Premiums
U.S. Insurance
Marine	$	119,040	$	(55,830	)	$	63,210	$	64,635	$	129,621	$	(53,823	)	$	75,798	$	73,636		(8.2	%)		3.7	%		(16.6	%)		(12.2	%)
P&C		524,223		(129,297	)		394,926		366,280		471,532		(103,286	)		368,246		335,342		11.2	%		25.2	%		7.2	%		9.2	%
ProfessionalLiability		86,580		(14,545	)		72,035		69,326		88,065		(21,365	)		66,700		53,468		(1.7	%)		(31.9	%)		8.0	%		29.7	%
Total	$	729,843	$	(199,672	)	$	530,171	$	500,241	$	689,218	$	(178,474	)	$	510,744	$	462,446		5.9	%		11.9	%		3.8	%		8.2	%
Int'l Insurance
Marine	$	160,119	$	(33,410	)	$	126,709	$	116,058	$	151,548	$	(33,274	)	$	118,274	$	109,746		5.7	%		0.4	%		7.1	%		5.8	%
P&C		124,446		(69,780	)		54,666		67,292		145,125		(57,025	)		88,100		70,608		(14.2	%)		22.4	%		(37.9	%)		(4.7	%)
ProfessionalLiability		102,089		(26,178	)		75,911		67,243		87,694		(21,776	)		65,918		55,248		16.4	%		20.2	%		15.2	%		21.7	%
Total	$	386,654	$	(129,368	)	$	257,286	$	250,593	$	384,367	$	(112,075	)	$	272,292	$	235,602		0.6	%		15.4	%		(5.5	%)		6.4	%
GlobalRe	$	188,025	$	(9,021	)	$	179,004	$	130,487	$	127,787	$	(7,467	)	$	120,320	$	118,312		47.1	%		20.8	%		48.8	%		10.3	%
Total	$	1,304,522	$	(338,061	)	$	966,461	$	881,321	$	1,201,372	$	(298,016	)	$	903,356	$	816,360		8.6	%		13.4	%		7.0	%		8.0	%

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NOTE 3.  INVESTMENTS

The following tables set forth our Company’s available-for-sale investments as of September 30, 2017 and December 31, 2016 and include Other-Than-Temporary-Impairment (“OTTI”) securities recognized within Accumulated Other Comprehensive Income (“AOCI”):

	September 30, 2017
			Gross		Gross			Cost or
	Fair		Unrealized		Unrealized			Amortized
amounts in thousands	Value		Gains		(Losses)			Cost
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	269,851	$	8,169	$	(607	)	$	262,289
States, Municipalities and Political Subdivisions		684,792		20,643		(1,481	)		665,630
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		426,441		3,365		(4,298	)		427,374
Residential Mortgage Obligations		34,748		570		(27	)		34,205
Asset-Backed Securities		331,646		2,503		(426	)		329,569
Commercial Mortgage-Backed Securities		140,601		2,742		(1,308	)		139,167
Subtotal	$	933,436	$	9,180	$	(6,059	)	$	930,315
Corporate Exposures (1)		910,106		18,221		(1,983	)		893,868
Total Fixed Maturities	$	2,798,185	$	56,213	$	(10,130	)	$	2,752,102
Equity Securities:
Common Stocks	$	180,771	$	35,179	$	(815	)	$	146,407
Preferred Stocks		195,105		7,418		(645	)		188,332
Total Equity Securities	$	375,876	$	42,597	$	(1,460	)	$	334,739
Short-Term Investments		247,607		5		—			247,602
Total Investments	$	3,421,668	$	98,815	$	(11,590	)	$	3,334,443

(1) - Corporate Exposures consist of investments in corporate bonds, hybrid bonds and redeemable preferred stocks.

	December 31, 2016
			Gross		Gross			Cost or
	Fair		Unrealized		Unrealized			Amortized
amounts in thousands	Value		Gains		(Losses)			Cost
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	273,776	$	2,192	$	(5,128	)	$	276,712
States, Municipalities and Political Subdivisions		547,415		11,542		(4,036	)		539,909
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		487,364		4,016		(6,585	)		489,933
Residential Mortgage Obligations		20,530		453		(55	)		20,132
Asset-Backed Securities		314,601		824		(1,178	)		314,955
Commercial Mortgage-Backed Securities		154,139		2,859		(1,904	)		153,184
Subtotal	$	976,634	$	8,152	$	(9,722	)	$	978,204
Corporate Exposures (1)		838,057		10,185		(5,528	)		833,400
Total Fixed Maturities	$	2,635,882	$	32,071	$	(24,414	)	$	2,628,225
Equity Securities:
Common Stocks	$	164,087	$	24,677	$	(964	)	$	140,374
Preferred Stocks		185,055		2,339		(4,821	)		187,537
Total Equity Securities	$	349,142	$	27,016	$	(5,785	)	$	327,911
Short-Term Investments		143,539		88		—			143,451
Total Investments	$	3,128,563	$	59,175	$	(30,199	)	$	3,099,587

(1) - Corporate Exposures consist of investments in corporate bonds, hybrid bonds and redeemable preferred stocks.

During 2016, our Company made investments in certain companies, which are reported as Other Invested Assets on the Consolidated Balance Sheet and accounted for using the equity method.  In applying the equity method, these investments are initially recorded at

13

cost and are subsequently adjusted based on our Company’s proportionate share of the net income or loss of the investments. Our initial purchase price for these investments was $2.0 million with a current carrying value of $1.8 million at September 30, 2017 as reflected on our Consolidated Balance Sheet.

As of September 30, 2017 and December 31, 2016, our Company did not have a concentration of greater than 5% of invested assets in a single non-government backed issuer.

As of September 30, 2017 and December 31, 2016, Fixed Maturities for which Non-Credit OTTI was previously recognized and included in AOCI were in a Net Unrealized Gain position of $0.5 million and $0.4 million, respectively.

The fair value of our Company’s investment portfolio may fluctuate significantly in response to various factors such as changes in interest rates, investment quality ratings, equity prices, foreign exchange rates and credit spreads. Our Company does not have the intent to sell nor is it more likely than not that it will have to sell Fixed Maturities in unrealized loss positions that are not other-than-temporarily impaired before recovery. For structured securities, default probability and severity assumptions differ based on property type, vintage and the stress of the collateral. Our Company does not intend to sell, and it is more likely than not that our Company will not be required to sell, these securities before the recovery of the amortized cost basis. For Equity Securities, our Company also considers our intent to hold securities as part of the process of evaluating whether a decline in fair value represents an other-than-temporary decline in value. Our Company may realize investment losses to the extent our liquidity needs require the disposition of Fixed Maturity securities in unfavorable interest rate, liquidity or credit spread environments. Significant changes in the factors our Company considers when evaluating investments for impairment losses could result in a significant change in impairment losses reported in the Consolidated Financial Statements.

The contractual maturity dates for Fixed Maturities categorized by the number of years until maturity as of September 30, 2017 are shown in the following table:

	September 30, 2017
	Fair		Amortized
amounts in thousands	Value		Cost
Due in one year or less	$	218,780	$	216,537
Due after one year through five years		708,302		697,520
Due after five years through ten years		333,260		324,180
Due after ten years		604,407		583,550
Mortgage-Backed and Asset-Backed Securities		933,436		930,315
Total	$	2,798,185	$	2,752,102

Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Prepayment assumptions associated with the Mortgage-Backed and Asset-Backed Securities are reviewed on a periodic basis. When changes in prepayment assumptions are deemed necessary as the result of actual prepayments differing from anticipated prepayments, securities are revalued based upon the new prepayment assumptions utilizing the retrospective accounting method. Due to the periodic repayment of principal, our Mortgage-Backed and Asset-Backed Securities are estimated to have an effective maturity of approximately 4.9 years.

14

The following tables summarize all securities in a gross unrealized loss position as of September 30, 2017 and December 31, 2016, showing the aggregate fair value and gross unrealized loss by the length of time those securities have continuously been in a gross unrealized loss position:

	September 30, 2017
	Less than 12 months					Greater than 12 months					Total
			Gross					Gross					Gross
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
amounts in thousands	Value		(Losses)			Value		(Losses)			Value		(Losses)
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	67,562	$	(344	)	$	31,928	$	(263	)	$	99,490	$	(607	)
States, Municipalities and Political Subdivisions		80,570		(732	)		31,125		(749	)		111,695		(1,481	)
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		237,804		(2,846	)		56,656		(1,452	)		294,460		(4,298	)
Residential Mortgage Obligations		7,899		(6	)		586		(21	)		8,485		(27	)
Asset-Backed Securities		69,885		(379	)		4,942		(47	)		74,827		(426	)
Commercial Mortgage-Backed Securities		41,572		(594	)		7,924		(714	)		49,496		(1,308	)
Subtotal	$	357,160	$	(3,825	)	$	70,108	$	(2,234	)	$	427,268	$	(6,059	)
Corporate Exposures		150,289		(915	)		93,463		(1,068	)		243,752		(1,983	)
Total Fixed Maturities	$	655,581	$	(5,816	)	$	226,624	$	(4,314	)	$	882,205	$	(10,130	)
Equity Securities:
Common Stocks	$	15,633	$	(814	)	$	87	$	(1	)	$	15,720	$	(815	)
Preferred Stocks		31,775		(614	)		667		(31	)		32,442		(645	)
Total Equity Securities	$	47,408	$	(1,428	)	$	754	$	(32	)	$	48,162	$	(1,460	)
Total Fixed Maturities and Equity Securities	$	702,989	$	(7,244	)	$	227,378	$	(4,346	)	$	930,367	$	(11,590	)

	December 31, 2016
	Less than 12 months					Greater than 12 months					Total
			Gross					Gross					Gross
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
amounts in thousands	Value		(Losses)			Value		(Losses)			Value		(Losses)
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	150,891	$	(2,570	)	$	16,819	$	(2,558	)	$	167,710	$	(5,128	)
States, Municipalities and Political Subdivisions		137,731		(3,111	)		13,255		(925	)		150,986		(4,036	)
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		349,119		(6,155	)		12,401		(430	)		361,520		(6,585	)
Residential Mortgage Obligations		953		(18	)		926		(37	)		1,879		(55	)
Asset-Backed Securities		95,514		(970	)		48,093		(208	)		143,607		(1,178	)
Commercial Mortgage-Backed Securities		51,932		(1,164	)		7,910		(740	)		59,842		(1,904	)
Subtotal	$	497,518	$	(8,307	)	$	69,330	$	(1,415	)	$	566,848	$	(9,722	)
Corporate Exposures		325,733		(5,086	)		26,005		(442	)		351,738		(5,528	)
Total Fixed Maturities	$	1,111,873	$	(19,074	)	$	125,409	$	(5,340	)	$	1,237,282	$	(24,414	)
Equity Securities:
Common Stocks	$	31,272	$	(634	)	$	1,471	$	(330	)	$	32,743	$	(964	)
Preferred Stocks		113,742		(4,785	)		523		(36	)		114,265		(4,821	)
Total Equity Securities	$	145,014	$	(5,419	)	$	1,994	$	(366	)	$	147,008	$	(5,785	)
Total Fixed Maturities and Equity Securities	$	1,256,887	$	(24,493	)	$	127,403	$	(5,706	)	$	1,384,290	$	(30,199	)

Our Company analyzes impaired securities quarterly to determine if any impairments are other-than-temporary.  The above securities with unrealized losses are deemed to be temporarily impaired based on our evaluation.  

As of September 30, 2017, there were 317 Fixed Maturities and 35 Equity Securities in an unrealized loss position. As of December 31, 2016, there were 413 Fixed Maturities and 75 Equity Securities in an unrealized loss position. As of September 30, 2017, the gross unrealized loss for the greater than 12 months category consists primarily of Agency Mortgage-Backed Securities and Corporate Exposures principally due to an increase in interest rates since the time of purchase. As of December 31, 2016, the gross unrealized

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loss for the greater than 12 months category consists primarily of Agency and Foreign Government Bonds principally due to unfavorable foreign exchange movement.  The gross unrealized loss for the less than 12 months category for the period ended September30, 2017 consists primarily of Agency Mortgage-Backed Securities due to an increase in interest rates since the time of purchase.  The gross unrealized loss for the less than 12 months category for the period ended December 31, 2016 consists primarily of Agency Mortgage-Backed Securities, Corporate Exposures and Preferred Stocks, which are reported as Equity Securities, due to an increase in interest rates since the time of purchase.

As of September 30, 2017 and December 31, 2016, the largest unrealized loss by a non-government backed issuer in the investment portfolio was $0.8 million and $1.0 million, respectively.

Our Company’s ability to hold securities is supported by sufficient cash flow from our operations and from maturities within our investment portfolio in order to meet our claims payments and other disbursement obligations arising from our underwriting operations without selling such investments.  With respect to securities where the decline in value is determined to be temporary and the security’s value is not written down, a subsequent decision may be made to sell that security and realize a loss.  Subsequent decisions on security sales are made within the context of overall risk monitoring, changing information and market conditions.  

Our Company had two credit related OTTI losses of $1.0 million in the equity portfolio during the three months ended September 30, 2017. Our Company had four credit related OTTI losses of $2.1 million in the equity portfolio during the nine months ended September 30, 2017. Our Company had no credit related OTTI losses during the three months ended September 30, 2016 and one credit related OTTI loss of $0.2 million in the Fixed Maturities portfolio during the nine months ended September 30, 2016.

The following table summarizes the cumulative amounts related to our Company’s credit loss portion of the OTTI losses on Fixed Maturities for the three and nine months ended September 30, 2017 and 2016

	Three Months Ended September 30,					Nine Months Ended September 30,
amounts in thousands	2017		2016			2017		2016
Beginning Balance	$	2,361	$	2,511		$	2,361	$	2,361
Additions for Credit Loss Impairments recognized in the    current period on securities not previously impaired		—		—			—		150
Additions for Credit Loss Impairments recognized in the    current period on securities previously impaired		—		—			—		—
Reductions for Credit Loss Impairments previously    recognized  on securities sold during the period		—		(150	)		—		(150	)
Ending Balance	$	2,361	$	2,361		$	2,361	$	2,361

Our Company’s Net Investment Income was derived from the following sources:

	Three Months Ended September 30,						Nine Months Ended September 30,
amounts in thousands	2017			2016			2017			2016
Fixed Maturities	$	19,491		$	17,124		$	57,019		$	50,781
Equity Securities		3,774			3,540			11,337			10,418
Short-Term Investments		250			70			662			568
Total Investment Income	$	23,515		$	20,734		$	69,018		$	61,767
Investment Expenses		(917	)		(859	)		(2,707	)		(2,423	)
Net Investment Income	$	22,598		$	19,875		$	66,311		$	59,344

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Realized Gains and Losses, excluding net OTTI losses recognized in earnings, for the periods indicated, were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
amounts in thousands	2017			2016			2017			2016
Fixed Maturities:
Gains	$	2,589		$	1,356		$	3,401		$	5,200
Losses		(900	)		(1,221	)		(3,114	)		(3,086	)
Fixed Maturities, Net	$	1,689		$	135		$	287		$	2,114
Short-Term:
Gains	$	767		$	128		$	1,014		$	803
Losses		(111	)		(107	)		(371	)		(250	)
Short-Term, Net	$	656		$	21		$	643		$	553
Equity Securities:
Gains	$	2,863		$	1,443		$	7,249		$	3,123
Losses		(18	)		(13	)		(246	)		(647	)
Equity Securities, Net	$	2,845		$	1,430		$	7,003		$	2,476
Net Realized Gains	$	5,190		$	1,586		$	7,933		$	5,143

NOTE 4.  FAIR VALUE MEASUREMENT

The fair value of our financial instruments is determined based on the following fair value hierarchy:

Level 1 – Quoted prices for identical instruments in active markets.  Examples are listed Common Stocks and fixed income securities traded on an exchange.  U.S. Treasury securities are reported as Level 1 and are valued based on unadjusted quoted prices for identical assets in active markets that our Company can access.

Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets.  Examples are Asset-Backed and Mortgage-Backed Securities that are similar to other Asset-Backed or Mortgage-Backed Securities observed in the market. U.S. Government Agency Securities are reported as Level 2 and are valued using yields and spreads that are observable in active markets.

Level 3 – Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.  An example would be a private placement with minimal liquidity.

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The following tables present, for each of the fair value hierarchy levels as defined by the accounting guidance for fair value measurements described above, our Company’s Fixed Maturities and Equity Securities by asset class that are measured at fair value on a recurring basis, as well as the fair value of the 5.75% Senior Notes due October 15, 2023 (the “Senior Notes”) carried at amortized cost as of September 30, 2017 and December 31, 2016:

	September 30, 2017
amounts in thousands	Level 1		Level 2		Level 3		Total
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	51,612	$	218,239	$	—	$	269,851
States, Municipalities and Political Subdivisions		—		684,792		—		684,792
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		—		426,441		—		426,441
Residential Mortgage Obligations		—		34,748		—		34,748
Asset-Backed Securities		—		331,646		—		331,646
Commercial Mortgage-Backed Securities		—		140,601		—		140,601
Subtotal	$	—	$	933,436	$	—	$	933,436
Corporate Exposures		—		910,106		—		910,106
Total Fixed Maturities	$	51,612	$	2,746,573	$	—	$	2,798,185
Equity Securities:
Common Stocks	$	180,771	$	—	$	—	$	180,771
Preferred Stocks		—		195,105		—		195,105
Total Equity Securities	$	180,771	$	195,105	$	—	$	375,876
Short-Term Investments		247,607		—		—		247,607
Total Assets Measured at Fair Value	$	479,990	$	2,941,678	$	—	$	3,421,668
Senior Notes	$	—	$	282,073	$	—	$	282,073
Total Liabilities Measured at Fair Value	$	—	$	282,073	$	—	$	282,073

	December 31, 2016
amounts in thousands	Level 1		Level 2		Level 3		Total
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	47,704	$	226,072	$	—	$	273,776
States, Municipalities and Political Subdivisions		—		547,415		—		547,415
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		—		487,364		—		487,364
Residential Mortgage Obligations		—		20,530		—		20,530
Asset-Backed Securities		—		314,601		—		314,601
Commercial Mortgage-Backed Securities		—		154,139		—		154,139
Subtotal	$	—	$	976,634	$	—	$	976,634
Corporate Exposures		—		838,057		—		838,057
Total Fixed Maturities	$	47,704	$	2,588,178	$	—	$	2,635,882
Equity Securities:
Common Stocks	$	164,087	$	—	$	—	$	164,087
Preferred Stocks		—		185,055		—		185,055
Total Equity Securities	$	164,087	$	185,055	$	—	$	349,142
Short-Term Investments		143,539		—		—		143,539
Total Assets Measured at Fair Value	$	355,330	$	2,773,233	$	—	$	3,128,563
Senior Notes	$	—	$	280,316	$	—	$	280,316
Total Liabilities Measured at Fair Value	$	—	$	280,316	$	—	$	280,316

All other financial assets and liabilities including Cash, Premium Receivable, Reinsurance Recoverable and Reinsurance Balances Payable are carried at cost, which approximates fair value.

Our Company did not have any significant transfers between Level 1 and Level 2 classifications for the three and nine months ended September 30, 2017 and 2016.

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As of September 30, 2017, our Company did nothave any Level 3 assets.

NOTE 5.  LOSS RESERVES

We establish reserves for the estimated unpaid ultimate liability for losses and LAE under the terms of our policies and agreements.  The determination of Reserves for Losses and LAE is partially dependent upon the receipt of information from agents and brokers.  Reserves include estimates for both claims that have been reported and for those that have been incurred but not reported (“IBNR”), and include estimates of expenses associated with processing and settling these claims.  Reserves are recorded in Reserves for Losses and LAE in the Consolidated Balance Sheets.  Our estimates and judgements may be revised as additional experience and other data become available and are reviewed, as new or improved methodologies are developed, or as laws change. Frequency/severity analyses are also performed for certain books of business.  To the extent that reserves are found deficient or redundant, a strengthening or release is recognized as a charge or credit to earnings.

The following table summarizes our Company’s Reserves for Losses and LAE activity for the nine months ended September 30, 2017 and 2016:

	For the Nine Months Ended September 30,
amounts in thousands	2017			2016
Net Reserves for Losses and LAE at Beginning of Year	$	1,510,451		$	1,393,126
Provision for Losses and LAE for Claims Occurring in the Current Year		578,272			504,599
Increase (Decrease) in Estimated Losses and LAE for Claims Occurring in Prior Years		44,609			(11,644	)
Incurred Losses and LAE	$	622,881		$	492,955
Losses and LAE Paid for Claims Occurring During:
Current Year		(75,707	)		(72,897	)
Prior Years		(358,684	)		(323,761	)
Losses and LAE Payments	$	(434,391	)	$	(396,658	)
Foreign Currency Adjustment		11,688			(9,213	)
Net Reserves for Losses and LAE at End of Period		1,710,629			1,480,210
Reinsurance Recoverables on Unpaid Losses and LAE		847,505			787,917
Gross Reserves for Losses and LAE at End of Period	$	2,558,134		$	2,268,127

For the nine months ended September 30, 2017, our Incurred Losses and LAE increased $129.9 million as compared to the same period in 2016.

The Provision for Losses and LAE for Claims Occurring in the Current Year increased primarily due to additional net current accident year (“AY”) loss activity related to a higher level of catastrophe losses during the nine months ended September 30, 2017, including Hurricanes Maria ($26.4 million), Irma ($25.8 million) and Harvey ($17.1 million) and the Puebla, Mexico Earthquake ($3.5 million), as compared to the same period in 2016, which included the Alberta Wildfires, Ecuador Earthquake and Taiwan Earthquake. Additionally, growth in Net Earned Premium over the prior year added to the increase in the Provision for Losses and LAE for Claims Occurring in the Current Year.

In addition, we incurred $44.6 million of net prior AY reserve strengthening for the nine months ended September 30, 2017 primarily related to loss development in our Int’l Insurance reporting segment, large loss activity in our U.S. D&O division, strengthening of our U.S. casualty business and the settlement of a large claim in our GlobalRe reporting segment compared to $11.6 million of net prior AY reserve releases for the same period in 2016attributable to better than expected loss emergence within all three reporting segments.

For the nine months ended September 30, 2017, our Losses and LAE Payments increased $37.7 million as compared to the same period in 2016, primarily due to increased claim payments in our Int’l Insurance reporting segment.

Our September 30, 2017 Net Reserves for Losses and LAE includes estimated amounts for numerous catastrophe events. We caution that the magnitude and complexity of losses arising from these events inherently increases the level of uncertainty and therefore the level of management judgment involved in arriving at our estimated Net Reserves for Losses and LAE. As a result, our actual losses for these events may ultimately differ materially from our current estimates.

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NOTE 6. CEDED REINSURANCE

The following table lists our Company’s 10 largest reinsurers measured by the amount of total reinsurance recoverables as of September 30, 2017, and the reinsurers’ ratings from A.M. Best and S&P:

	Reinsurance Recoverables
	Unearned		Paid/Unpaid				Collateral
amounts in thousands	Premium		Losses (1)		Total		Held		A.M. Best	S&P
Everest Reinsurance Company	$	28,539		87,285		115,824		11,731	A+	A+
Swiss Reinsurance America Corporation		23,116		73,548		96,664		7,088	A+	AA-
National Indemnity Company		6,363		68,539		74,902		6,482	A++	AA+
Transatlantic Reinsurance Company		8,522		52,237		60,759		2,543	A+	A+
Munich Reinsurance America Inc.		11,094		46,158		57,252		4,898	A+	AA-
Aspen Insurance UK Ltd.		10,050		29,700		39,750		8,057	A	A
Employers Mutual Casualty Company		10,623		27,670		38,293		11,100	A	NR
Allied World Reinsurance		6,531		31,684		38,215		1,937	A	A-
Partner Reinsurance Europe		5,699		28,532		34,231		11,095	A	A+
Ace Property and Casualty Insurance Company		6,720		23,288		30,008		1,556	A++	AA
Top 10 Reinsurers	$	117,257		468,641		585,898		66,487
Others		113,917		439,918		553,835		105,129
Total	$	231,174		908,559		1,139,733		171,616

(1) - Net of reserve for uncollectable reinsurance of approximately $12.4 million.

We have established reserves for uncollectible reinsurance in the amounts of $12.4 million and $12.1 million as of September 30, 2017 and December 31, 2016, respectively.

Our Company holds collateral of $171.6 million, which consists of $129.3 million in ceded balances payable, $39.7 million in letters of credit and $2.6 million of funds held as trust account balances.   NIC and NSIC are required to collateralize reinsurance obligations due to us from reinsurers not authorized by their respective states of domicile.

The following table summarizes the components of Net losses and LAE incurred:

	Nine Months Ended September 30,
amounts in thousands	2017			2016
Direct	$	747,759		$	586,100
Assumed		124,730			69,657
Ceded		(249,608	)		(162,802	)
Net losses and LAE	$	622,881		$	492,955

NOTE 7.  COMMITMENTS AND CONTINGENCIES

In 2013, the State of Connecticut (“the State”) awarded our Company up to $11.5 million ($8.0 million in loans and $3.5 million in grants) to move our corporate headquarters to Stamford, Connecticut.  The loan is non-interest bearing, has a term of 10 years and is subject to forgiveness based on our compliance with certain conditions set forth in the agreement with the State.  The amount of the loan to be received is dependent on our Company reaching certain milestones for creation of new jobs over a five-year period, and the funds are to be used to offset certain equipment purchases, facility costs, training of employees and other eligible project-related costs.  As of September 30, 2017, our Company has received $9.9 million of the award ($7.5 million in loans and $2.4 million of the grant) and earned a loan forgiveness credit of $7.0 million with the State. Our Company is recognizing the amount of loan and grants received over the period in which offsetting expenses are recognized. Our Company recognized $0.4 million and $0.9 million of the incentive for the three and nine months ended September 30, 2017. As of September 30, 2017 and December 31, 2016, our Company has deferred revenue of $4.8 million for both periods, which is included in Other Liabilities on the Consolidated Balance Sheets.

On February 16, 2017, our Company entered into a guarantee, pursuant to which it guaranteed all of the liabilities and obligations of NIIC (the “Guarantee”). The Guarantee will remain effective until all of such liabilities and obligations are discharged, and in the event that our Company does not meet its obligations under the Guarantee, any person who is covered by an insurance policy, certificate of coverage or reinsurance contract issued by NIIC will be a third party beneficiary under the Guarantee.  Our Company’s obligations under the Guarantee may be terminated by providing twelve months prior written notice to NIIC. However the obligations

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of our Company under the Guarantee terminate immediately in the event that (i) the majority of the outstanding voting capital stock in NIIC is sold to any non-affiliated entity; (ii) A.M. Best has confirmed that NIIC will receive the same financial strength rating as NIC or NSIC, without the benefit of the Guarantee; or (iii) NIIC withdraws its request to be rated by A.M. Best, provided that NIIC has not been downgraded within the prior twelve months.

In the ordinary course of conducting business, our Parent Company’s subsidiaries are involved in various legal proceedings. Most of these proceedings consist of claims litigation involving our Parent Company’s subsidiaries as either: (a) liability insurers defending or providing indemnity for third party claims brought against insureds or (b) insurers defending first party coverage claims brought against them. In general, our Company believes we have valid defenses to these cases. Our Company’s management believes that the ultimate liability, if any, with respect to these legal proceedings, after consideration of provisions made for potential losses and cost of defense, will not be material to our Company’s Consolidated Balance Sheets, Statements of Income and Statements of Cash Flows.

NOTE 8.  STOCK-BASED COMPENSATION

Stock-based compensation granted under our Company’s stock plans is expensed in tranches over the vesting period. Non-performance based grants generally vest equally over a three or four-year period. Performance units generally cliff vest three years after they are granted. For the nine months ended September 30, 2017, we granted 279,630 stock incentive units at a weighted average grant price of $55.74. Each performance unit and restricted stock unit represents a contingent right to receive one share of Common Stock as of the vesting date. Such Common Stock may be subject to forfeiture for the payment of any required tax withholding.

NOTE 9. STOCKHOLDERS’ EQUITY

On September 14, 2017 our Company paid a dividend of $0.06 per share on The Navigators Group, Inc. Common Stock to Stockholders of record on August 24, 2017. 

The declaration and amount of any future dividend will be at the discretion of the Board of Directors, and will depend upon many factors, including financial condition, results of operations, business requirements, regulatory, legal constraints and other factors the Board of Directors deems relevant.

NOTE 10. SUBSEQUENT EVENTS

On November 2, 2017, our Board of Directors declared a cash dividend on our Company’s Common Stock of $0.06 per share, payable on December 15, 2017 to stockholders of record on November 24, 2017.

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

FORWARD-LOOKING STATEMENTS

Some of the statements in this Quarterly Report on Form 10-Q are “forward-looking statements” as defined in the Private Securities Litigation Reform Act of 1995. All statements other than statements of historical fact included in or incorporated by reference in this Quarterly Report are forward-looking statements.  Whenever used in this report, the words “estimate,” “expect,” “believe,” “may,” “will,” “intend,” “continue” or similar expressions or their negative are intended to identify such forward-looking statements.  Forward-looking statements are derived from information that we currently have and assumptions that we make, and are subject to a number of risks and uncertainties, including those described in the “Risk Factors” section of our 2016 Annual Report on Form 10-K.  We operate in a competitive environment, with new risks emerging from time to time. We cannot assure you that anticipated results will be achieved, since actual results may differ materially because of both known and unknown risks and uncertainties which we face.

In light of these risks, uncertainties and assumptions, any forward-looking events discussed in this Form 10-Q may not occur, and we undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law. You are cautioned not to place undue reliance on any forward-looking statements, which speak only as of their respective dates.

U.S. GAAP and Non-GAAP Financial Performance Metrics

Throughout this Quarterly Report, we present our operations in the way we believe will be most meaningful, useful and transparent to anyone using this financial information to evaluate our performance. In addition to the presentation of Net Income (Loss), Book Value, Book Value per Share, Net Losses and LAE Reserves and Combined Ratio, we show certain non-GAAP financial measures as defined in Regulation G that we believe are valuable in managing our business and drawing comparisons to our peers. These non-GAAP measures are Net Operating Earnings (Loss), Underwriting Profit (Loss), and Adjusted Net Losses and LAE Ratio.

The following is a list of GAAP and non-GAAP measures found throughout this report with their definitions, relationships to GAAP measures and explanations of their importance to our operations:

Book Value and Book Value Per Share

Book Value is equivalent to Stockholders’ Equity and Book Value per Share is calculated by dividing Stockholders’ Equity by the number of outstanding shares at the end of the interim period.

Net Losses and LAE Reserves

Reserves for Losses and LAE, as shown in the liabilities section of our Consolidated Balance Sheets, represents the total gross obligations to claimants for both estimates of known claims and estimates for IBNR claims. The related asset item, Reinsurance Recoverable on Unpaid Losses and LAE, is the estimate of both known claims and IBNR that we expect to recover from reinsurers. The net of these two items is generally referred to as Net Losses and LAE Reserves and is commonly used in our disclosures regarding the process of establishing these various estimated amounts.

Combined Ratio

The Combined Ratio is a common insurance industry measure of profitability for any underwriting operation and is calculated in three components. First, the Loss Ratio is represented by Net Losses and LAE divided by Net Earned Premiums. The second component is the Commission Expense Ratio, which is Commission Expenses divided by Net Earned Premiums. The third component is the Other Operating Expense Ratio, which reflects the sum of Other Operating Expenses and Other Underwriting Income (Expense), divided by Net Earned Premiums. All items included in these components of the Combined Ratio are presented in our GAAP Consolidated Financial Statements. The sum of the Loss, Commission Expense and Other Operating Expense Ratios is the Combined Ratio. The difference between the Combined Ratio and 100% reflects the rate of Underwriting Profit (Loss). For example, a Combined Ratio of 85% implies that for every $100 of premium we earn, we record $15 of Underwriting Profit.

Net Operating Earnings (Loss)

Net Operating Earnings (Loss) is a “non-GAAP financial measure” as defined in Regulation G. Net Operating Earnings is comprised of Net Income (Loss) excluding After-Tax Net Realized Gains (Losses), After-Tax Net OTTI Losses Recognized in Earnings, and After-Tax Foreign Exchange Gains and Losses recognized in our Consolidated Statements of Income (Loss). We believe that showing Net Income (Loss) exclusive of Realized Gains and Losses, Net OTTI Losses Recognized in Earnings, and Foreign Exchange Gains and Losses reflects the underlying fundamentals of our business.

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A reconciliation of Net Income (Loss) (the nearest GAAP financial measure) to Net Operating Earnings (Loss) can be found in Item 2, Results of Operations. We believe this presentation enhances the understanding of our results of operations by highlighting the underlying profitability of our business and enables investors and other users of our financial information to analyze underlying business performance in a manner similar to management. We also believe this measure follows industry practice and, therefore facilitates comparison of our performance with our peer group.

Underwriting Profit (Loss)

Underwriting Profit (Loss) represents one measure of the pre-tax profitability of our insurance operations and is derived by subtracting the following from Net Earned Premiums: Net Losses and LAE Incurred, Commission Expenses, Other Operating Expenses and Other Underwriting Income (Expense). This information is available in total and by segment in Note 2 – Segment Information in the Interim Consolidated Financial Statements. The nearest comparable GAAP measure is Income (Loss) Before Income Taxes which, in addition to Net Underwriting Profit (Loss), includes Net Investment Income, OTTI, Net Realized Gains (Losses) on Investments, Interest Expense and Other Income (Loss). While this measure is presented in the footnotes to the Interim Consolidated Financial Statements, it is considered a “non-GAAP financial measure” as defined in Regulation G when presented elsewhere on a consolidated basis.

A reconciliation of total Net Underwriting Profit (Loss) and its components to Income (Loss) Before Income Taxes (the nearest GAAP financial measure) can be found in Item 1, Note 2 to the Interim Consolidated Financial Statements and in Item 2, Segment Results. We believe that presentation of Net Underwriting Profit (Loss) provides investors with an enhanced understanding of our results of operations, by highlighting the underlying pre-tax profitability of our underwriting activities.

Adjusted Net Losses and LAE Ratio

The Net Losses and LAE ratio is a major component of our Underwriting Profit (Loss). In order to better understand the impact of this ratio on Underwriting Profit (Loss), we present the impact of reinsurance reinstatement premiums (“RRPs”), development on current AY results and development on prior AY results to arrive at our Adjusted Net Losses and LAE Ratio.

A reconciliation of the Net Losses and LAE Ratio (the nearest GAAP financial measure) to the Adjusted Net Losses and LAE ratio can be found in Item 2, Results of Operations and Segment Results. We believe that presentation of the Adjusted Net Losses and LAE Ratio allows investors to more easily analyze our Company’s results of operations and understand our underlying business performance.

Overview

The discussion and analysis of our financial condition and results of operations contained herein should be read in conjunction with our 2016 Annual Report on Form 10-K in its entirety as well as the statements under “Forward-Looking Statements” and the Interim Consolidated Financial Statements included elsewhere in this Quarterly Report on Form 10-Q for a complete description of events, trends, uncertainties, risks and critical accounting estimates affecting us.

Unless the context requires otherwise, the terms “we,” “us,”  “our” or “our Company” are used to mean The Navigators Group, Inc., a Delaware holding company established in 1982, and its subsidiaries. The term “Parent Company” is used to mean The Navigators Group, Inc. without its subsidiaries.

We are an international insurance company with a long-standing area of specialization in Marine insurance. We also offer P&C insurance, primarily general liability coverage and umbrella & excess liability coverage to commercial enterprises through our Primary and Excess Casualty divisions. We have also developed niches in Professional Liability insurance, through our D&O and E&O divisions, as well as assumed reinsurance products.

On December 6, 2016, our Board of Directors declared a two-for-one stock split of The Navigators Group, Inc. Common Stock that was effected in the form of a stock dividend. Stockholders of record at the close of business on December 30, 2016 received one additional share of Common Stock for every share of Common Stock held. The additional shares of Common Stock were issued on January 20, 2017. All disclosures of shares and per share data have been retroactively adjusted to reflect the stock split for all periods presented.

Effective January 1, 2017, we sold our underwriting agency operations in Sweden and Denmark. The transaction represented a 100% disposition of our Sweden and Denmark corporations, NUAL AB and Navigators A/S, respectively. This transaction did not materially impact our results of operation, financial condition or liquidity.

Additionally, our new U.K. based insurance company, NIIC,which is a wholly-owned direct subsidiary of our Parent Company, began writing business in the first quarter of 2017.

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Financial Highlights – Selected Indicators

	Three Months Ended					Nine Months Ended
amounts in thousands, except per share amounts	September 30, 2017			September 30, 2016		September 30, 2017			September 30, 2016
Results of Operations Data:
Net Earned Premiums	$	301,355		$	284,010	$	881,321		$	816,360
Net Investment Income		22,598			19,875		66,311			59,344
Underwriting Profit (Loss)		(66,090	)		12,513		(48,123	)		26,611
Net Income (Loss)		(27,979	)		22,013		13,633			61,135
Net Income (Loss) per Diluted Share (1)	$	(0.95	)	$	0.73	$	0.45		$	2.04
Net Cash provided by Operating Activities	$	149,847		$	72,806	$	222,751		$	191,300

amounts in thousands, except per share amounts	As of September 30, 2017		As of December 31, 2016
Balance Sheet Data:
Total Assets	$	5,275,548	$	4,814,037
Total Shareholders' Equity	$	1,224,191	$	1,178,188
Book Value per Share (1)	$	41.49	$	40.45

(1) - We completed a two-for-one stock split on January 20, 2017. All share and per share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

Our revenue is primarily comprised of premiums and investment income. Cash flow is generated from premiums collected and investment income received less paid losses and loss expenses, commission and administrative expenses as well as the timing of reinsurance receipts and payments. Our products are distributed through multiple channels, utilizing global, national and regional retail and wholesale insurance brokers.

We report our results of operations consistent with the manner in which our Chief Operating Decision Maker reviews the business to assess performance by our four reportable segments: U.S. Insurance, Int’l Insurance, GlobalRe and Corporate.  

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Results of Operations

The following table presents a summary of our consolidated financial results for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,						Nine Months Ended September 30,						%Change
amounts in thousands, except per share amounts	2017			2016			2017			2016			QTD			YTD
Gross Written Premiums	$	402,038		$	374,930		$	1,304,522		$	1,201,372			7.2	%		8.6	%
Ceded Written Premiums		(106,022	)		(97,929	)		(338,061	)		(298,016	)		8.3	%		13.4	%
Net Written Premiums		296,016			277,001			966,461			903,356			6.9	%		7.0	%
Net Earned Premiums		301,355			284,010			881,321			816,360			6.1	%		8.0	%
Net Losses and LAE		(276,171	)		(172,793	)		(622,881	)		(492,955	)		59.8	%		26.4	%
Commission Expenses		(45,509	)		(42,611	)		(141,526	)		(120,891	)		6.8	%		17.1	%
Other Operating Expenses		(45,773	)		(56,137	)		(165,077	)		(176,020	)		(18.5	%)		(6.2	%)
Other Underwriting Income		8			44			40			117			(81.8	%)		(65.8	%)
Underwriting Profit (Loss)	$	(66,090	)	$	12,513		$	(48,123	)	$	26,611		NM			NM
Net Investment Income		22,598			19,875			66,311			59,344			13.7	%		11.7	%
Net Realized Gains		4,218			1,586			5,868			4,993		NM				17.5	%
Interest Expense		(3,862	)		(3,859	)		(11,584	)		(11,575	)		0.1	%		0.1	%
Other Income (Loss)		(1,707	)		(227	)		(1,082	)		6,679		NM			NM
Income (Loss) Before Income Taxes	$	(44,843	)	$	29,888		$	11,390		$	86,052		NM				(86.8	%)
Income Tax (Expense) Benefit		16,864			(7,875	)		2,243			(24,917	)	NM			NM
Net Income (Loss)	$	(27,979	)	$	22,013		$	13,633		$	61,135		NM				(77.7	%)
Net Income (Loss) per Basic Share (1)	$	(0.95	)	$	0.76		$	0.46		$	2.10
Net Income (Loss) per Diluted Share (1)	$	(0.95	)	$	0.73		$	0.45		$	2.04
Effective Tax Rate		37.6	%		26.3	%		(19.7	%)		29.0	%
Losses and LAE Ratio		91.6	%		60.8	%		70.7	%		60.4	%
Commission Expense Ratio		15.1	%		15.0	%		16.1	%		14.8	%
Other Operating Expense Ratio (2)		15.2	%		19.8	%		18.7	%		21.5	%
Combined Ratio		121.9	%		95.6	%		105.5	%		96.7	%

NM - Percentage change not meaningful

(1) - We completed a two-for-one stock split on January 20, 2017. All per share data has been retroactively restated on a post-split basis.

(2) - Includes Other Operating Expenses and Other Underwriting Income.

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The following tables calculate our Net Operating Earnings (Loss) for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30, 2017									Three Months Ended September 30, 2016									% Change
amounts in thousands, except per share amounts	Pre-Tax			Tax (1)			After-Tax			Pre-Tax			Tax (1)			After-Tax			QTD
Net Income (Loss)	$	(44,843	)	$	16,864		$	(27,979	)	$	29,888		$	(7,875	)	$	22,013		NM
Adjustments to Net Income (Loss):
Realized Losses (Gains)		(4,218	)		1,477			(2,741	)		(1,586	)		555			(1,031	)	NM
FX Losses (Gains)		1,675			(586	)		1,089			227			(80	)		147		NM
Net Operating Earnings (Loss)	$	(47,386	)	$	17,755		$	(29,631	)	$	28,529		$	(7,400	)	$	21,129		NM
Average Common Shares Outstanding: (2)
Basic								29,500									29,115
Diluted								29,500									30,141
Net Operating Earnings (Loss) per Common Share: (2)
Basic							$	(1.00	)							$	0.73
Diluted							$	(1.00	)							$	0.70

	Nine Months Ended September 30, 2017									Nine Months Ended September 30, 2016									% Change
amounts in thousands, except per share amounts	Pre-Tax			Tax (1)			After-Tax			Pre-Tax			Tax (1)			After-Tax			YTD
Net Income	$	11,390		$	2,243		$	13,633		$	86,052		$	(24,917	)	$	61,135			(77.7	%)
Adjustments to Net Income:
Realized Losses (Gains)		(5,868	)		2,055			(3,813	)		(4,993	)		1,747			(3,246	)		17.5	%
FX Losses (Gains)		1,015			(355	)		660			(6,679	)		2,337			(4,342	)	NM
Net Operating Earnings	$	6,537		$	3,943		$	10,480		$	74,380		$	(20,833	)	$	53,547			(80.4	%)
Average Common Shares Outstanding: (2)
Basic								29,419									29,058
Diluted								30,006									29,997
Net Operating Earnings per Common Share: (2)
Basic							$	0.36								$	1.84
Diluted							$	0.35								$	1.79

NM - Percentage change not meaningful

(1) - Tax impact is estimated by applying the statutory rates of applicable jurisdictions, after consideration of any other relevant factors.

(2) - We completed a two-for-one stock split on January 20, 2017. All per share data has been retroactively restated on a post-split basis.

Underwriting Profit (Loss)

Quarter to Date Variance

Underwriting Profit decreased $78.6 million from $12.5 million for the three months ended September 30, 2016 to an Underwriting Loss of $66.1 million for the three months ended September 30, 2017. This was driven by Underwriting Losses of $9.7 million, $29.9 million and $26.5 million in our U.S. Insurance, Int’l Insurance and GlobalRe reporting segments, respectively, for the three months ended September 30, 2017 compared to an Underwriting Profit of $5.5 million in our U.S. Insurance reporting segment, an Underwriting Loss of $0.8 million in our Int’l Insurance reporting segment and Underwriting Profit of $7.8 million in our GlobalRe reporting segment for the same period in 2016.

The decrease from Underwriting Profit to an Underwriting Loss for our U.S. Insurance reporting segment for the three months ended September 30, 2017 compared to the same period in 2016 was primarily due to Net Prior AY Reserve Strengthening in our Professional Liability and P&C operating segments as well as Additional Net Current AY Reserve Development and related RRPs associated with Hurricanes Harvey, Irma and Maria and large loss activity in our Marine operating segment. These decreases to Underwriting Profit were partially offset by lower Other Operating Expenses as a result of reductions to performance-based incentive compensation, the impact of increased Earned Premium and a decrease in the Commission Expense Ratio.

The increase in Underwriting Loss for our Int’l Insurance reporting segment for the three months ended September 30, 2017 compared to the same period in 2016 was due to Additional Net Current AY Reserve Development and related RRPs primarily associated with Hurricanes Maria, Irma and Harvey and the Puebla, Mexico Earthquake as well as Net Prior AY Reserve Strengthening primarily in the Marine operating segment during the three months ended September 30, 2017. These increases to the Underwriting Loss were partially offset by lower Other Operating Expenses as a result of reductions to performance-based incentive compensation and the impact of increased Earned Premiums.

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The decrease in Underwriting Profit to an Underwriting Loss in our GlobalRe reporting segment for the three months ended September 30, 2017 compared to the same period in 2016 was primarily due to Additional Net Current AY Reserve Development primarily associated with Hurricanes Maria, Irma and Harvey and the Puebla, Mexico Earthquake. An increase in profit commissions, resulting in a higher Commission Expense Ratio compared to the prior period, also contributed to the decrease in Underwriting Profit. These decreases were partially offset by the impact of increased Net Earned Premiums, lower Other Operating Expenses as a result of reductions to performance-based incentive compensation and net assumed RRPs primarily related to the catastrophe events this quarter.

Year to Date Variance

Underwriting Profit decreased $74.7 million from $26.6 million for the nine months ended September 30, 2016 to an Underwriting Loss of $48.1 million for the nine months ended September 30, 2017. This was driven by an Underwriting Profit of $10.0 million in our U.S. Insurance reporting segment, an Underwriting Loss of $39.0 million in our Int’l Insurance reporting segment and an Underwriting Loss of $19.1 million in our GlobalRe reporting segment for the nine months ended September 30, 2017 compared to an Underwriting Profit of $24.9 million in our U.S. Insurance reporting segment, an Underwriting Loss of $10.4 million in our Int’l Insurance reporting segment and an Underwriting Profit of $12.1 million in our GlobalRe reporting segment, for the same period in 2016.

The decrease in Underwriting Profit for our U.S. Insurance reporting segment for the nine months ended September 30, 2017 compared to the same period in 2016 was primarily due to Net Prior AY Reserve Strengthening mostly in our Professional Liability operating segment and Additional Net Current AY Reserve Development and related RRPs associated with Hurricanes Harvey, Irma and Maria and large loss activity in our Marine and P&C operating segments, partially offset by a decrease in the Adjusted Net Losses and LAE Ratio. An increase in the Commission Expense Ratio compared to the prior period also contributed to the decrease. These decreases to Underwriting Profit were partially offset by the impact of increased Earned Premium and lower Other Operating Expenses as a result of reductions to performance-based incentive compensation.

The increase in Underwriting Losses for our Int’l Insurance reporting segment for the nine months ended September 30, 2017 compared to the same period in 2016 was primarily due to Net Prior AY Reserve Strengthening during the nine months ended September 30, 2017 compared to Net Prior AY Reserve Releases during the same period in 2016 as well as Additional Net Current AY Reserve Development and related RRPs primarily associated with Hurricanes Maria, Irma and Harvey and the Puebla, Mexico Earthquake, partially offset by a decrease in the Adjusted Net Losses and LAE Ratio during the nine months ended September 30, 2017 compared to the same period in 2016. An increase in the Commission Expense Ratio compared to the prior period also contributed to the decrease. These increases to the Underwriting Loss were partially offset by lower Other Operating Expenses as a result of reductions to performance-based incentive compensation and the impact of increased Earned Premiums.

The decrease in Underwriting Profit to an Underwriting Loss for our GlobalRe reporting segment for the nine months ended September 30, 2017 compared to the same period in 2016 was primarily due to Additional Net Current AY Reserve Development primarily associated with Hurricanes Maria, Irma and Harvey and the Puebla, Mexico Earthquake as well as Net Prior AY Reserve Strengthening during the nine months ended September 30, 2017 compared to Net Prior AY Reserve Releases during the same period in 2016, partially offset by a decrease in the Adjusted Net Losses and LAE Ratio during the nine months ended September 30, 2017 compared to the same period in 2016 due to changes in the mix of business. An increase in the Commission Expense Ratio compared to the prior period due to higher profit commissions also contributed to the decrease in Underwriting Profit, partially offset by the impact of increased Earned Premium and net assumed RRPs primarily related to the catastrophe events this quarter.

For more detail on Underwriting Profit (Loss), see the U.S. Insurance, Int’l Insurance and GlobalRe reporting segment results sections included herein.

A major component of our Underwriting Profit (Loss) is Net Losses and LAE.  The following table presents the impact of changes in reserves and RRPs on our Net Losses and LAE Ratio for the three months ended September 30, 2017 and 2016:

	Three Months Ended September 30,						Point
	2017			2016			Change
Reported Net Losses and LAE Ratio		91.6	%		60.8	%		30.8
Net RRPs		(0.7	%)		0.1	%		(0.8	)
Additional Net Current AY Reserve Release/(Development)		(26.0	%)		(4.3	%)		(21.7	)
Net Prior AY Reserve Release/(Strengthening)		(9.7	%)		0.4	%		(10.1	)
Adjusted Net Losses and LAE Ratio		55.2	%		57.0	%		(1.8	)

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Quarter to Date Variance

For the three months ended September 30, 2017, our Reported Net Losses and LAE Ratio increased 30.8 points as compared to the same period in 2016 primarily driven by:

• $79.1 million of Additional Net Current AY Reserve Development for the three months ended September 30, 2017 primarily attributable to catastrophe losses of $69.3 million from Hurricanes Maria ($26.4 million), Irma ($25.8 million) and Harvey ($17.1 million) as well as $3.5 million from the Puebla, Mexico Earthquake and $6.3 million primarily related to large Marine losses in our U.S and Int’l Insurance reporting segments. This compares to $12.3 million for the same period in 2016, primarily related to a large Marine loss in our Int’l Insurance reporting segment and weather-related losses in our Int’l Insurance and GlobalRe reporting segments.

• $29.5 million of Net Prior AY Reserve Strengthening for the three months ended September 30, 2017 related to our Professional Liability and P&C operating segments within our U.S. Insurance reporting segment and our Marine, P&C and Professional Liability operating segments within our Int’l Insurance reporting segment. This compares to $1.0 million of Net Prior AY Reserve Releases related to better than expected loss emergence in our Int’l Marine operating segment and GlobalRe reporting segment, partially offset by strengthening in our U.S and Int’l Professional Liability operating segments and Int’l P&C operating segment for the same period in 2016.

• A net $2.2 million RRP expense generated primarily by the catastrophe losses this quarter (with the quarter events consisting of $6.6 million ceded, partially offset by $4.3 million assumed), compared to a net $0.9 million benefit for the same period in 2016.

Partially offsetting these decreases to the Reported Net Losses and LAE Ratio;

• Changes in the mix of business drove the 1.8 point decrease in the Adjusted Net Loss and LAE Ratio.

The following table presents the impact of changes in reserves and RRPs on our Net Losses and LAE Ratio for the nine months ended September 30, 2017 and 2016 :

	Nine Months Ended September 30,						Point
	2017			2016			Change
Reported Net Losses and LAE Ratio		70.7	%		60.4	%		10.3
Net RRPs		(0.1	%)		(0.1	%)		(0.0	)
Additional Net Current AY Reserve Release/(Development)		(10.4	%)		(4.4	%)		(6.0	)
Net Prior AY Reserve Release/(Strengthening)		(5.1	%)		1.4	%		(6.5	)
Adjusted Net Losses and LAE Ratio		55.1	%		57.3	%		(2.2	)

Year to Date Variance

For the nine months ended September 30, 2017, our Reported Net Losses and LAE Ratio increased 10.3 points as compared to the same period in 2016 primarily driven by:

• $44.6 million of Net Prior AY Reserve Strengthening for the nine months ended September 30, 2017 related to strengthening of our Professional Liability and P&C operating segments within our U.S. Insurance reporting segment, strengthening our Marine, P&C and Professional Liability operating segments within our Int’l Insurance reporting segment and the settlement of a large Accident and Health (“A&H”) claim in our GlobalRe reporting segment. This compares to $11.6 million of Net Prior AY Reserve Releases related to better than expected loss emergence in our Int’l and U.S Marine operating segments and our GlobalRe reporting segment, partially offset by strengthening in our Professional Liability and P&C operating segments within our U.S. and Int’l Insurance reporting segments for the same period in 2016.

• $91.5 million of Additional Net Current AY Reserve Development for the nine months ended September 30, 2017 primarily attributable to catastrophe losses of $69.3 million from Hurricanes Harvey, Irma and Maria, $3.5 million from the Puebla, Mexico Earthquake and $18.7 million primarily related to Marine and Property large losses in our U.S. and Int’l Insurance reporting segments and additional weather-related losses in our GlobalRe reporting segment. This compares to $35.6 million for the same period in 2016 primarily related to the Alberta Wildfires, Ecuador Earthquake and Taiwan Earthquake, a large Marine loss in our Int’l Insurance reporting segment and weather-related losses in our Int’l Insurance and GlobalRe reporting segments.

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• A net $1.5 million RRP expense was generated primarily by the catastrophe losses this quarter (with the quarter events consisting of $6.6 million ceded, partially offset by $4.3 million assumed), compared to a net $1.4 million expense for the same period in 2016.

Partially offsetting these decreases to the Reported Net Losses and LAE Ratio;

• Changes in the mix of business drove the 2.2 point decrease in Adjusted Net Loss and LAE Ratio.

Net Investment Income

Our Net Investment Income was derived from the following sources:

	Three Months Ended September 30,						Nine Months Ended September 30,
amounts in thousands	2017			2016			2017			2016
Fixed Maturities	$	19,491		$	17,124		$	57,019		$	50,781
Equity Securities		3,774			3,540			11,337			10,418
Short-Term Investments		250			70			662			568
Total Investment Income	$	23,515		$	20,734		$	69,018		$	61,767
Investment Expenses		(917	)		(859	)		(2,707	)		(2,423	)
Net Investment Income	$	22,598		$	19,875		$	66,311		$	59,344

Quarter and Year to Date Variance

The increase in total Net Investment Income for the three and nine months ended September 30, 2017 as compared to the same periods in the prior year was due to growth of invested assets coupled with higher yields. The annualized pre-tax yield, excluding Net Realized Gains and Losses and OTTI Losses Recognized in Earnings, for the three months ended September 30, 2017 and 2016, was 2.7% and 2.5%, respectively.  The annualized pre-tax yield, excluding Net Realized Gains and Losses and OTTI Losses Recognized in Earnings, for the nine months ended September 30, 2017 and 2016, was 2.7% and 2.6%, respectively.  

As part of our overall investment strategy, we seek to build a tax efficient investment portfolio by maintaining an allocation of tax- exempt municipal bonds. The tax-exempt portion of our Fixed Maturities portfolio was 20.2% at September 30, 2017 as compared to 18.1% at September 30, 2016. Additionally, substantially all of our equity portfolio is invested in tax efficient securities which qualify for the dividends received deduction. The tax equivalent yield for the three months ended September 30, 2017 and 2016 was 3.1% and 2.8%, respectively. The tax equivalent yield for the nine months ended September 30, 2017 and 2016 was 3.1% and 2.8%, respectively.

OTTI Losses Recognized in Earnings

Quarter and Year to Date Variance

Our Company had two credit related OTTI losses of $1.0 million in our equity portfolio during the three months ended September 30, 2017.  Our Company had four credit related OTTI losses of $2.1 million in our equity portfolio during the nine months ended September 30, 2017. Our Company had no credit related OTTI losses during the three  months ended September 30, 2016 and one credit related OTTI loss of $0.2 million in the Fixed Maturities portfolio during the nine months ended September 30, 2016.

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Net Realized Gains and Losses

Net Realized Gains and Losses, excluding OTTI Losses Recognized in Earnings, for the periods indicated were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
amounts in thousands	2017			2016			2017			2016
Fixed Maturities:
Gains	$	2,589		$	1,356		$	3,401		$	5,200
Losses		(900	)		(1,221	)		(3,114	)		(3,086	)
Fixed Maturities, Net	$	1,689		$	135		$	287		$	2,114
Short-Term:
Gains	$	767		$	128		$	1,014		$	803
Losses		(111	)		(107	)		(371	)		(250	)
Short-Term, Net	$	656		$	21		$	643		$	553
Equity Securities:
Gains	$	2,863		$	1,443		$	7,249		$	3,123
Losses		(18	)		(13	)		(246	)		(647	)
Equity Securities, Net	$	2,845		$	1,430		$	7,003		$	2,476
Net Realized Gains	$	5,190		$	1,586		$	7,933		$	5,143

Quarter to Date Variance

Net Realized Gains and Losses are generated as part of the normal ongoing management of our investment portfolio. Net Realized Gains of $5.2 million for the three months ended September 30, 2017 are due to the sale of Common and Preferred Stocks and Corporate Bonds, coupled with realized foreign exchange gains coming from our Sterling denominated fixed income portfolio. Realized gains for the third quarter were partially offset by foreign currency losses on our Canadian denominated Foreign Government Bonds. Net Realized Gains of $1.6 million for the three months ended September 30, 2016 are primarily due to the sale of Equity Securities and Government Bonds, partially offset by realized losses in the Fixed Maturities portfolio primarily driven by foreign currency losses on our Canadian Foreign Government Bonds.

Year to Date Variance

Net Realized Gains of $7.9 million for the nine months ended September 30, 2017 are due to the sale of Common and Preferred Stocks and Corporate Bonds, coupled with realized foreign exchange gains coming from our Sterling denominated fixed income portfolio. Realized gains for the nine months ended September 30, 2017 were partially offset by foreign currency losses on our Canadian denominated Foreign Government Bonds. Net Realized Gains of $5.1 million for the nine months ended September 30, 2016 are primarily due to the sale of Corporate and Municipal Bonds, offset by realized losses in the Fixed Maturities portfolio primarily driven by foreign currency losses in our Canadian denominated Foreign Government Bonds.

Interest Expense

Quarter and Year to Date Variance

Interest Expense was $3.9 million and $11.6 million for the three and nine months ended September 30, 2017, respectively, relating to our $265.0 million principal amount of the Senior Notes.  The effective interest rate related to the Senior Notes, based on the proceeds net of discount and all issuance costs, is approximately 5.86%.

Other Income

Quarter and Year to Date Variance

Other Income (Loss) for the three and nine months ended September 30, 2017 was $(1.7) million and (1.0) million, respectively, compared to $(0.2) million and $6.8 million for the same periods in 2016, respectively. Other Income (Loss) primarily consists of realized and unrealized foreign exchange gains and losses. The losses in 2017 were mostly driven by the weakening of the U.S. Dollar against the Great British pound (“GBP”). The gain for the nine months ended September 30, 2016 was mostly driven by the strengthening of the U.S. Dollar against the GBP.

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Income Taxes

Quarter and Year to Date Variance

The Effective Tax Rate was 37.6% and (19.7%) for the three and nine months ended September 30, 2017, respectively. This compares to 26.3% and 29.0% for the same periods in 2016, respectively. The Effective Tax Rate differs from the U.S statutory tax rate of 35% primarily as a result of tax-exempt investment income and the excess tax benefit related to the vesting of stock compensation at fair market value. Catastrophic losses incurred in the third quarter of 2017 resulted in significantly lower pretax earnings and caused the tax favored adjustments to have a larger percentage impact than they did in 2016.

Starting in the first quarter of 2017, excess tax benefits related to the vesting of stock compensation were recognized as a reduction to Income Tax Expense rather than as an increase to Additional Paid-In Capital as a result of the adoption of ASU 2016-09 (see Item 1, Note 1 to the Interim Consolidated Financial Statements for further information on the adoption of this standard).

Segment Results

The following tables summarize our Consolidated Financial Results by reporting segment for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30, 2017
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	169,150		$	84,407		$	47,798		$	—		$	301,355
Net Losses and LAE		(135,340	)		(81,713	)		(59,118	)		—			(276,171	)
Commission Expenses		(18,286	)		(16,201	)		(11,233	)		211			(45,509	)
Other Operating Expenses		(25,375	)		(16,388	)		(4,010	)		—			(45,773	)
Other Underwriting Income (Expense)		125			—			94			(211	)		8
Underwriting Loss	$	(9,726	)	$	(29,895	)	$	(26,469	)	$	—		$	(66,090	)
Net Investment Income											22,598			22,598
Net Realized Gains											4,218			4,218
Interest Expense											(3,862	)		(3,862	)
Other Loss											(1,707	)		(1,707	)
Loss Before Income Taxes	$	(9,726	)	$	(29,895	)	$	(26,469	)	$	21,247		$	(44,843	)
Income Tax Benefit											16,864			16,864
Net Loss													$	(27,979	)
Losses and LAE Ratio		80.0	%		96.8	%		123.7	%					91.6	%
Commission Expense Ratio		10.8	%		19.2	%		23.5	%					15.1	%
Other Operating Expense Ratio (2)		14.9	%		19.4	%		8.2	%					15.2	%
Combined Ratio		105.7	%		135.4	%		155.4	%					121.9	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

31

	Three Months Ended September 30, 2016
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	161,722		$	79,761		$	42,527		$	—		$	284,010
Net Losses and LAE		(106,320	)		(45,043	)		(21,430	)		—			(172,793	)
Commission Expenses		(18,630	)		(15,348	)		(8,951	)		318			(42,611	)
Other Operating Expenses		(31,517	)		(20,183	)		(4,437	)		—			(56,137	)
Other Underwriting Income (Expense)		240			—			122			(318	)		44
Underwriting Profit (Loss)	$	5,495		$	(813	)	$	7,831		$	—		$	12,513
Net Investment Income											19,875			19,875
Net Realized Gains											1,586			1,586
Interest Expense											(3,859	)		(3,859	)
Other Loss											(227	)		(227	)
Income (Loss) Before Income Taxes	$	5,495		$	(813	)	$	7,831		$	17,375		$	29,888
Income Tax Expense											(7,875	)		(7,875	)
Net Income													$	22,013
Losses and LAE Ratio		65.7	%		56.5	%		50.4	%					60.8	%
Commission Expense Ratio		11.5	%		19.2	%		21.0	%					15.0	%
Other Operating Expense Ratio (2)		19.4	%		25.3	%		10.2	%					19.8	%
Combined Ratio		96.6	%		101.0	%		81.6	%					95.6	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

	Nine Months Ended September 30, 2017
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	500,241		$	250,593		$	130,487		$	—		$	881,321
Net Losses and LAE		(339,436	)		(176,513	)		(106,932	)		—			(622,881	)
Commission Expenses		(59,130	)		(54,435	)		(28,695	)		734			(141,526	)
Other Operating Expenses		(91,987	)		(58,687	)		(14,403	)		—			(165,077	)
Other Underwriting Income (Expense)		335			—			439			(734	)		40
Underwriting Profit (Loss)	$	10,023		$	(39,042	)	$	(19,104	)	$	—		$	(48,123	)
Net Investment Income											66,311			66,311
Net Realized Gains											5,868			5,868
Interest Expense											(11,584	)		(11,584	)
Other Loss											(1,082	)		(1,082	)
Income (Loss) Before Income Taxes	$	10,023		$	(39,042	)	$	(19,104	)	$	59,513		$	11,390
Income Tax Benefit											2,243			2,243
Net Income													$	13,633
Losses and LAE Ratio		67.9	%		70.4	%		81.9	%					70.7	%
Commission Expense Ratio		11.8	%		21.7	%		22.0	%					16.1	%
Other Operating Expense Ratio (2)		18.3	%		23.5	%		10.7	%					18.7	%
Combined Ratio		98.0	%		115.6	%		114.6	%					105.5	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

32

	Nine Months Ended September 30, 2016
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	462,446		$	235,602		$	118,312		$	—		$	816,360
Net Losses and LAE		(291,260	)		(133,519	)		(68,176	)		—			(492,955	)
Commission Expenses		(50,379	)		(47,524	)		(24,188	)		1,200			(120,891	)
Other Operating Expenses		(96,848	)		(64,997	)		(14,175	)		—			(176,020	)
Other Underwriting Income (Expense)		943			—			374			(1,200	)		117
Underwriting Profit (Loss)	$	24,902		$	(10,438	)	$	12,147		$	—		$	26,611
Net Investment Income											59,344			59,344
Net Realized Gains											4,993			4,993
Interest Expense											(11,575	)		(11,575	)
Other Income											6,679			6,679
Income (Loss) Before Income Taxes	$	24,902		$	(10,438	)	$	12,147		$	59,441		$	86,052
Income Tax Expense											(24,917	)		(24,917	)
Net Income													$	61,135
Losses and LAE Ratio		63.0	%		56.7	%		57.6	%					60.4	%
Commission Expense Ratio		10.9	%		20.2	%		20.4	%					14.8	%
Other Operating Expense Ratio (2)		20.7	%		27.5	%		11.7	%					21.5	%
Combined Ratio		94.6	%		104.4	%		89.7	%					96.7	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

U.S. Insurance

The following tables summarize our Underwriting Profit (Loss) by operating segment for our U.S. Insurance reporting segment for the three and nine months ended September 30, 2017 and 2016:

	U.S. Insurance
	Three Months Ended September 30, 2017
amounts in thousands	Marine			P&C			Professional Liability			Total			%Change Total
Gross Written Premiums	$	36,403		$	166,097		$	32,552		$	235,052			0.2	%
Ceded Written Premiums		(18,859	)		(39,952	)		(5,517	)		(64,328	)		4.8	%
Net Written Premiums		17,544			126,145			27,035			170,724			(1.5	%)
Net Earned Premiums	$	20,129		$	125,931		$	23,090		$	169,150			4.6	%
Net Losses and LAE		(18,325	)		(89,568	)		(27,447	)		(135,340	)		27.3	%
Commission Expenses		(967	)		(13,515	)		(3,804	)		(18,286	)		(1.8	%)
Other Operating Expenses		(4,661	)		(16,897	)		(3,817	)		(25,375	)		(19.5	%)
Other Underwriting Income		105			18			2			125			(47.9	%)
Underwriting Profit (Loss)	$	(3,719	)	$	5,969		$	(11,976	)	$	(9,726	)	NM
Losses and LAE Ratio		91.0	%		71.1	%		118.9	%		80.0	%
Commission Expense Ratio		4.8	%		10.7	%		16.5	%		10.8	%
Other Operating Expense Ratio (1)		22.7	%		13.5	%		16.5	%		14.9	%
Combined Ratio		118.5	%		95.3	%		151.9	%		105.7	%

(1) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

NM – Percentage change not meaningful

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	U.S. Insurance
	Three Months Ended September 30, 2016
amounts in thousands	Marine			P&C			Professional Liability			Total
Gross Written Premiums	$	40,271		$	161,600		$	32,776		$	234,647
Ceded Written Premiums		(17,636	)		(36,011	)		(7,712	)		(61,359	)
Net Written Premiums		22,635			125,589			25,064			173,288
Net Earned Premiums	$	25,465		$	115,971		$	20,286		$	161,722
Net Losses and LAE		(14,974	)		(74,129	)		(17,217	)		(106,320	)
Commission Expenses		(2,117	)		(13,664	)		(2,849	)		(18,630	)
Other Operating Expenses		(6,767	)		(19,997	)		(4,753	)		(31,517	)
Other Underwriting Income		126			104			10			240
Underwriting Profit (Loss)	$	1,733		$	8,285		$	(4,523	)	$	5,495
Losses and LAE Ratio		58.8	%		63.9	%		84.9	%		65.7	%
Commission Expense Ratio		8.3	%		11.8	%		14.0	%		11.5	%
Other Operating Expense Ratio (1)		26.1	%		17.2	%		23.4	%		19.4	%
Combined Ratio		93.2	%		92.9	%		122.3	%		96.6	%

(1) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

	U.S. Insurance
	Nine Months Ended September 30, 2017
amounts in thousands	Marine			P&C			Professional Liability			Total			%Change Total
Gross Written Premiums	$	119,040		$	524,223		$	86,580		$	729,843			5.9	%
Ceded Written Premiums		(55,830	)		(129,297	)		(14,545	)		(199,672	)		11.9	%
Net Written Premiums		63,210			394,926			72,035			530,171			3.8	%
Net Earned Premiums	$	64,635		$	366,280		$	69,326		$	500,241			8.2	%
Net Losses and LAE		(44,867	)		(239,175	)		(55,394	)		(339,436	)		16.5	%
Commission Expenses		(4,014	)		(44,113	)		(11,003	)		(59,130	)		17.4	%
Other Operating Expenses		(18,280	)		(60,356	)		(13,351	)		(91,987	)		(5.0	%)
Other Underwriting Income		270			45			20			335			(64.5	%)
Underwriting Profit (Loss)	$	(2,256	)	$	22,681		$	(10,402	)	$	10,023			(59.8	%)
Losses and LAE Ratio		69.4	%		65.3	%		79.9	%		67.9	%
Commission Expense Ratio		6.2	%		12.0	%		15.9	%		11.8	%
Other Operating Expense Ratio (1)		27.9	%		16.5	%		19.2	%		18.3	%
Combined Ratio		103.5	%		93.8	%		115.0	%		98.0	%

(1) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

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	U.S. Insurance
	Nine Months Ended September 30, 2016
amounts in thousands	Marine			P&C			Professional Liability			Total
Gross Written Premiums	$	129,621		$	471,532		$	88,065		$	689,218
Ceded Written Premiums		(53,823	)		(103,286	)		(21,365	)		(178,474	)
Net Written Premiums		75,798			368,246			66,700			510,744
Net Earned Premiums	$	73,636		$	335,342		$	53,468		$	462,446
Net Losses and LAE		(35,448	)		(217,898	)		(37,914	)		(291,260	)
Commission Expenses		(5,775	)		(38,337	)		(6,267	)		(50,379	)
Other Operating Expenses		(20,956	)		(61,568	)		(14,324	)		(96,848	)
Other Underwriting Income		357			550			36			943
Underwriting Profit (Loss)	$	11,814		$	18,089		$	(5,001	)	$	24,902
Losses and LAE Ratio		48.1	%		65.0	%		70.9	%		63.0	%
Commission Expense Ratio		7.8	%		11.4	%		11.7	%		10.9	%
Other Operating Expense Ratio (1)		28.1	%		18.2	%		26.8	%		20.7	%
Combined Ratio		84.0	%		94.6	%		109.4	%		94.6	%

(1) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

Gross Written Premiums

Quarter to Date Variance

Gross Written Premiums increased $0.4 million for the three months ended September 30, 2017 as compared to the same period in 2016 driven by a $4.5 million increase in our P&C operating segment, partially offset by decreases in our Marine and Professional Liability operating segments of $3.9 million and $0.2 million, respectively.

The decrease in our Marine operating segment was impacted by our decision to exit certain Hull and War products. Additionally, the renewal of certain business now being managed in our Int’l Insurance reporting segment as well as a transfer of the management of our Custom Bonds product to the Other P&C division impacted the decrease.

The increase in our P&C operating segment was driven by increases in our Other P&C and Environmental divisions, partially offset by a decrease in our Primary Casualty division. The increase in our Other P&C division was driven by new business production in our Auto product and strong rates on renewals, an increase in our Property product driven by new business production as well as the transfer of the management of our Custom Bonds product from the Marine operating segment to our Surety product in our Other P&C division. The increase in our Environmental division was attributable to new business with increased opportunities in the market. The decrease in our Primary Casualty division was driven by the nonrenewal of underperforming accounts.

The decrease in our Professional Liability operating segment was primarily due to a lesser amount of renewals from business not meeting our underwriting pricing requirements and the impact of a challenging rate environment.

Average renewal premium rates for our U.S. Insurance reporting segment for the three months ended September 30, 2017 increased 0.4%, driven by increases of 1.0% and 0.5% within our Marine and P&C operating segments, respectively, partially offset by a decrease of 0.6% in our Professional Liability operating segment.

Year to Date Variance

Gross Written Premiums increased $40.6 million for the nine months ended September 30, 2017 as compared to the same period in 2016 driven by a $52.7 million increase in our P&C operating segment, partially offset by decreases in our Marine and Professional Liability operating segments of $10.6 million and $1.5 million, respectively.

The decrease in our Marine and Professional Liability operating segments was attributable to the same drivers as the quarter to date variance.

The increase in our P&C operating segment was primarily driven by increases in our Other P&C, Excess Casualty and Environmental divisions, partially offset by a decrease in our Primary Casualty division. The increases in our Other P&C and Environmental

35

divisions and the decrease in our Primary Casualty division were attributable to the same drivers as the quarter to date variances. The increase in our Excess Casualty division was primarily attributable to an increase in our Specialty Wholesale Excess Casualty product resulting from increases in construction project coverage recorded in the first quarter of 2017.

Average renewal premium rates for our U.S. Insurance reporting segment for the nine months ended September 30, 2017 increased 1.0%, driven by increases of 1.2% and 1.0% within our P&C and Marine operating segments, respectively.

Ceded Written Premiums

Quarter and Year to Date Variances

Ceded Written Premiums were $64.3 million and $199.7 million, resulting in a retention ratio of 72.6% of Net Written Premiums to Gross Written Premiums for the three and nine months ended September 30, 2017, respectively. This compares to $61.4 million, resulting in a retention ratio of 73.9%, and $178.5 million, resulting in a retention ratio of 74.1%, for the three and nine months ended September 30, 2016, respectively. The decrease in the retention ratio for both periods was driven by our P&C and Marine operating segments, partially offset by an increase in the retention ratio for our Professional Liability operating segment.

The decrease in our Marine operating segment’s retention ratio was driven by changes in the business mix and the impact of an increase in ceded RRPs related to Hurricanes Irma and Harvey.

The decrease in our P&C operating segment’s retention ratio was primarily the result of increased proportional reinsurance on our Property product purchased during the second quarter of 2017 and changes in the mix of business with less premium written in our Primary Casualty division which has a high retention ratio.

The increase in our Professional Liability operating segment’s retention ratio was primarily attributable to a reduction in proportional reinsurance coverage that supports our D&O business.

Net Earned Premiums

Quarter and Year to Date Variances

Net Earned Premiums increased $7.4 million and $37.8 million for the three and nine months ended September 30, 2017, respectively, as compared to the same periods in 2016 primarily due to growth within our P&C operating segment and recent reductions to the level of proportional reinsurance within our Professional Liability operating segment. These increases to Net Earned Premiums were partially offset by increased proportional reinsurance on our Property product, a decrease in the amount of premium written in our Marine operating segment and an increase in ceded RRPs related to Hurricanes Irma and Harvey.

Net Losses and LAE

The Net Losses and LAE reserves as of September 30, 2017 and December 31, 2016 are as follows:

	U.S. Insurance
	As of September 30, 2017								As of December 31, 2016
amounts in thousands	Marine		P&C		Professional Liability		Total		Marine		P&C		Professional Liability		Total		Total % Change
Case Reserves	$	62,475	$	197,009	$	32,385	$	291,869	$	56,701	$	201,368	$	24,555	$	282,624		3.3	%
IBNR Reserves		47,364		680,855		84,753		812,972		54,259		603,509		70,559		728,327		11.6	%
Total	$	109,839	$	877,864	$	117,138	$	1,104,841	$	110,960	$	804,877	$	95,114	$	1,010,951		9.3	%

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The following table presents the impact of net RRPs and Reserve Releases or (Development/Strengthening) on our Net Losses and LAE Ratio for the three months ended September 30, 2017 and 2016:

	U.S. Insurance
	Three Months Ended September 30, 2017												Three Months Ended September 30, 2016
							Professional												Professional						Point
	Marine			P&C			Liability			Total			Marine			P&C			Liability			Total			Change
Reported Net Losses and LAE Ratio		91.0	%		71.1	%		118.9	%		80.0	%		58.8	%		63.9	%		84.9	%		65.7	%		14.3
Net RRPs		(6.5	%)		(0.1	%)		0.0	%		(0.8	%)		(0.0	%)		0.0	%		0.0	%		0.0	%		(0.8	)
Additional Net Current AY Reserve    Release/(Development)		(28.2	%)		(5.6	%)		0.0	%		(7.7	%)		(0.1	%)		(0.1	%)		0.0	%		(0.1	%)		(7.6	)
Net Prior AY Reserve    Release/(Strengthening)		0.6	%		(3.8	%)		(59.5	%)		(10.8	%)		0.1	%		0.1	%		(24.8	%)		(3.0	%)		(7.8	)
Adjusted Net Losses and LAE Ratio		56.9	%		61.6	%		59.4	%		60.7	%		58.8	%		63.9	%		60.1	%		62.6	%		(1.9	)

Quarter to Date Variance

For the three months ended September 30, 2017, our Reported Net Losses and LAE Ratio increased 14.3 points as compared to the same period in 2016 driven by our P&C, Professional Liability and Marine operating segments.

For the three months ended September 30, 2017, our Reported Net Losses and LAE Ratio for our Marine operating segment increased 32.2 points as compared to the same period in 2016, primarily driven by:

• $6.1 million of Additional Net Current AY Reserve Development for the three months ended September 30, 2017 primarily attributable to losses of $4.0 million related to a large loss in our Hull product and $2.1 million of catastrophe losses from Hurricanes Harvey, Maria and Irma.

• $1.6 million of ceded RRP expense primarily due to the catastrophe losses this quarter.

Partially offsetting these increases to the Reported Net Losses and LAE Ratio;

• Changes in the mix of business driving the decrease in Adjusted Net Losses and LAE Ratio.

For the three months ended September 30, 2017, the Reported Net Losses and LAE Ratio for our P&C operating segment increased 7.2 points as compared to the same period in 2016. This was primarily driven by:

• $4.8 million of Net Prior AY Reserve Strengthening for the three months ended September 30, 2017 primarily related to strengthening of our casualty business.

• $7.1 million of Additional Net Current AY Reserve Development for the three months ended September 30, 2017 primarily attributable to catastrophe losses of $6.8 million from Hurricanes Irma and Harvey.

Partially offsetting these increases to the Reported Net Losses and LAE Ratio;

• Favorable performance across certain divisions, coupled with changes in the mix of business driving the decrease in Adjusted Net Losses and LAE Ratio.

For the three months ended September 30, 2017, our Reported Net Losses and LAE Ratio for our Professional Liability operating segment increased 34.0 points as compared to the same period in 2016, primarily due to:

• $13.7 million of Net Prior AY Reserve Strengthening for the three months ended September 30, 2017 mostly related to large loss activity within our D&O division. This compares to $5.0 million of Net Prior AY Reserve Strengthening within our D&O division due to large loss activity and bad debt expense due to lower expectations of recoveries from a large reinsurer for the same period in 2016.

Partially offsetting this increase to the Reported Net Losses and LAE Ratio;

• Changes in the mix of business driving the overall decrease in Adjusted Net Losses and LAE Ratio.

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The following table presents the impact of net RRPs and Reserve Releases or (Development/Strengthening) on our Net Losses and LAE Ratio for the nine months ended September 30, 2017 and 2016:

	U.S. Insurance
	Nine Months Ended September 30, 2017												Nine Months Ended September 30, 2016
							Professional												Professional						Point
	Marine			P&C			Liability			Total			Marine			P&C			Liability			Total			Change
Reported Net Losses and LAE Ratio		69.4	%		65.3	%		79.9	%		67.9	%		48.1	%		65.0	%		70.9	%		63.0	%		4.9
Net RRPs		(2.1	%)		(0.1	%)		0.0	%		(0.3	%)		(0.2	%)		0.0	%		0.0	%		(0.0	%)		(0.3	)
Additional Net Current AY Reserve    Release/(Development)		(9.2	%)		(2.6	%)		0.0	%		(3.1	%)		(0.0	%)		(0.5	%)		0.0	%		(0.3	%)		(2.8	)
Net Prior AY Reserve    Release/(Strengthening)		(1.2	%)		(1.0	%)		(19.8	%)		(3.6	%)		10.5	%		(0.3	%)		(9.4	%)		0.4	%		(4.0	)
Adjusted Net Losses and LAE Ratio		56.9	%		61.6	%		60.1	%		60.9	%		58.4	%		64.2	%		61.5	%		63.1	%		(2.2	)

Year to Date Variance

For the nine months ended September 30, 2017, our Reported Net Losses and LAE Ratio increased 4.9 points as compared to the same period in 2016 driven by our Marine, Professional Liability and P&C operating segments

For the nine months ended September 30, 2017, our Reported Net Losses and LAE Ratio for our Marine operating segment increased 21.3 points as compared to the same period in 2016, primarily driven by:

• $6.1 million of Additional Net Current AY Reserve Development for the three months ended September 30, 2017 primarily attributable to losses of $4.0 million related to a large loss in our Hull product and $2.1 million of catastrophe losses from Hurricanes Harvey, Maria and Irma.

• $2.0 million of ceded RRP expense primarily due to the catastrophe losses for the nine months ended September 30, 2017.

• $0.8 million of Net Prior AY Reserve Strengthening for the nine months ended September 30, 2017 compared to $7.7 million of Net Prior AY reserve releases due to better than expected loss emergence for the same period in 2016.

Partially offsetting these increases to the Reported Net Losses and LAE Ratio;

• Favorable performance within certain products driving the decrease in Adjusted Net Losses and LAE Ratio.

The Reported Net Losses and LAE Ratio for our P&C operating segment increased 0.3 points as compared to the same period in 2016. This was primarily driven by:

• $3.7 million of Net Prior AY Reserve Strengthening for the nine months ended September 30, 2017 related to strengthening our casualty business. This compares to $1.0 million of Net Prior AY Reserve Strengthening related to large loss activity in our Primary Casualty division for the same period in 2016.

• $9.7 million of Additional Net Current AY Reserve Development for the nine months ended September 30, 2017 primarily attributable to catastrophe losses of $6.8 million from Hurricanes Harvey and Irma and $2.6 million of large losses in our Property product. This compared to $1.5 million of Additional Net Current AY Reserve Development for the same period in 2016, mostly related to our Energy & Engineering product.

Partially offsetting this decrease to the Reported Net Losses and LAE Ratio;

• Favorable performance across certain divisions, coupled with changes in the mix of business driving the decrease in Adjusted Net Losses and LAE Ratio.

For the nine months ended September 30, 2017, our Reported Net Losses and LAE Ratio for our Professional Liability operating segment increased 9.0 points as compared to the same period in 2016, due to the same drivers as the quarter to date variance.

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Commission Expenses

Quarter to Date Variances

Our Commission Expense Ratio for the three months ended September 30, 2017 decreased 0.7 points as compared to the same period in 2016. The decrease was driven by our P&C and Marine operating segments, partially offset by an increase in our Professional Liability operating segment.

Our Marine operating segment’s Commission Expense Ratio decreased due to changes in business mix, partially offset by the impact of ceded RRPs related to Hurricanes Irma and Harvey.

Our P&C operating segment’s Commission Expense Ratio decreased due to a reduction in enhanced commissions compared to the prior period and greater ceding commission income from the proportional reinsurance on our Property product purchased during the second quarter of 2017.

Our Professional Liability operating segment’s Commission Expense Ratio increased due to the impact of reducing proportional reinsurance and the related ceding commission benefits.

Year to Date Variances

Our Commission Expense Ratio for the nine months ended September 30, 2017 increased 0.9 points as compared to the same period in 2016. The increase was driven by increases in our Professional Liability and P&C operating segments, partially offset by a decrease in our Marine operating segment.

The decrease in our Marine operating segment’s Commission Expense Ratio was driven by the same drivers as the quarter to date variance.

Our P&C operating segment’s Commission Expense Ratio increased due to changes in the business mix partially offset by greater ceding commission income from the proportional reinsurance on our Property product purchased during the second quarter of 2017.

The increase in our Professional Liability operating segment’s Commission Expense Ratio was driven by the same drivers as the quarter to date variance.

Other Operating Expenses

Quarter and Year to Date Variances

Other Operating Expenses for the three and nine months ended September 30, 2017 decreased $6.1 million and $4.9 million, respectively, as compared to the same periods in 2016, primarily due to a reduction in performance-based incentive compensation costs and a decrease in project specific information technology expenses, partially offset by an increase in costs associated with new business initiatives.  

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Int’l Insurance

The following tables summarize our Underwriting Profit (Loss) by operating segment for our Int’l Insurance reporting segment for the three and nine months ended September 30, 2017 and 2016: 

	Int'l Insurance
	Three Months Ended September 30, 2017
amounts in thousands	Marine			P&C			Professional Liability			Total			%Change Total
Gross Written Premiums	$	41,689		$	37,415		$	34,497		$	113,601			8.7	%
Ceded Written Premiums		(9,948	)		(19,772	)		(9,246	)		(38,966	)		10.7	%
Net Written Premiums		31,741			17,643			25,251			74,635			7.7	%
Net Earned Premiums	$	39,038		$	21,775		$	23,594		$	84,407			5.8	%
Net Losses and LAE		(39,457	)		(29,918	)		(12,338	)		(81,713	)		81.4	%
Commission Expenses		(8,532	)		(2,666	)		(5,003	)		(16,201	)		5.6	%
Other Operating Expenses		(6,788	)		(5,614	)		(3,986	)		(16,388	)		(18.8	%)
Underwriting Profit (Loss)	$	(15,739	)	$	(16,423	)	$	2,267		$	(29,895	)	NM
Losses and LAE Ratio		101.1	%		137.4	%		52.3	%		96.8	%
Commission Expense Ratio		21.9	%		12.2	%		21.2	%		19.2	%
Other Operating Expense Ratio (1)		17.3	%		25.8	%		16.9	%		19.4	%
Combined Ratio		140.3	%		175.4	%		90.4	%		135.4	%

(1) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

NM – Percentage change not meaningful

	Int'l Insurance
	Three Months Ended September 30, 2016
amounts in thousands	Marine			P&C			Professional Liability			Total
Gross Written Premiums	$	38,453		$	38,077		$	27,954		$	104,484
Ceded Written Premiums		(12,631	)		(15,331	)		(7,232	)		(35,194	)
Net Written Premiums		25,822			22,746			20,722			69,290
Net Earned Premiums	$	34,794		$	25,584		$	19,383		$	79,761
Net Losses and LAE		(17,289	)		(16,080	)		(11,674	)		(45,043	)
Commission Expenses		(8,358	)		(3,502	)		(3,488	)		(15,348	)
Other Operating Expenses		(7,654	)		(7,913	)		(4,616	)		(20,183	)
Underwriting Profit (Loss)	$	1,493		$	(1,911	)	$	(395	)	$	(813	)
Losses and LAE Ratio		49.7	%		62.8	%		60.2	%		56.5	%
Commission Expense Ratio		24.0	%		13.7	%		18.0	%		19.2	%
Other Operating Expense Ratio (1)		22.0	%		31.0	%		23.8	%		25.3	%
Combined Ratio		95.7	%		107.5	%		102.0	%		101.0	%

(1) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

40

	Int'l Insurance
	Nine Months Ended September 30, 2017
amounts in thousands	Marine			P&C			Professional Liability			Total			% Change Total
Gross Written Premiums	$	160,119		$	124,446		$	102,089		$	386,654			0.6	%
Ceded Written Premiums		(33,410	)		(69,780	)		(26,178	)		(129,368	)		15.4	%
Net Written Premiums		126,709			54,666			75,911			257,286			(5.5	%)
Net Earned Premiums	$	116,058		$	67,292		$	67,243		$	250,593			6.4	%
Net Losses and LAE		(83,906	)		(54,654	)		(37,953	)		(176,513	)		32.2	%
Commission Expenses		(27,590	)		(10,985	)		(15,860	)		(54,435	)		14.5	%
Other Operating Expenses		(24,454	)		(19,983	)		(14,250	)		(58,687	)		(9.7	%)
Underwriting Loss	$	(19,892	)	$	(18,330	)	$	(820	)	$	(39,042	)	NM
Losses and LAE Ratio		72.3	%		81.2	%		56.4	%		70.4	%
Commission Expense Ratio		23.8	%		16.3	%		23.6	%		21.7	%
Other Operating Expense Ratio (1)		21.0	%		29.7	%		21.2	%		23.5	%
Combined Ratio		117.1	%		127.2	%		101.2	%		115.6	%

(1) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

NM – Percentage change not meaningful

	Int'l Insurance
	Nine Months Ended September 30, 2016
amounts in thousands	Marine			P&C			Professional Liability			Total
Gross Written Premiums	$	151,548		$	145,125		$	87,694		$	384,367
Ceded Written Premiums		(33,274	)		(57,025	)		(21,776	)		(112,075	)
Net Written Premiums		118,274			88,100			65,918			272,292
Net Earned Premiums	$	109,746		$	70,608		$	55,248		$	235,602
Net Losses and LAE		(54,398	)		(49,174	)		(29,947	)		(133,519	)
Commission Expenses		(26,124	)		(11,427	)		(9,973	)		(47,524	)
Other Operating Expenses		(24,794	)		(25,686	)		(14,517	)		(64,997	)
Underwriting Profit (Loss)	$	4,430		$	(15,679	)	$	811		$	(10,438	)
Losses and LAE Ratio		49.6	%		69.6	%		54.2	%		56.7	%
Commission Expense Ratio		23.8	%		16.2	%		18.1	%		20.2	%
Other Operating Expense Ratio (1)		22.6	%		36.4	%		26.2	%		27.5	%
Combined Ratio		96.0	%		122.2	%		98.5	%		104.4	%

(1) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

Gross Written Premiums

Quarter to Date Variance

Gross Written Premiums increased $9.1 million for the three months ended September 30, 2017 compared to the same period in 2016, driven by increases in our Professional Liability and Marine operating segments of $6.5 million and $3.2 million, respectively, partially offset by a decrease in our P&C operating segment of $0.7 million.

The increase in our Marine operating segment was largely due to an increase in our Marine Liability product driven by premium estimate decreases booked in the prior year, growth in our Protection & Indemnity products attributable to new business and an increase in our Craft product related to the renewal of certain business previously managed in our U.S. Insurance reporting segment now managed in our Int’l Insurance reporting segment. These increases were partially offset by a decrease in our Hull product due to timing differences and a reduction in new business production in our Transport product.

The decrease in our P&C operating segment was primarily driven by a decline in our Property division, partially offset by increases in our Energy & Engineering and General Liability divisions. The decrease in our Property division was related to strategic actions taken

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to exit our North American Property business. Our Energy & Engineering division increase was primarily related to new business production including several large new Offshore Energy accounts. The increase in our General Liability division was driven by new business and premium estimate increases.

The increase in our Professional Liability operating segment was primarily driven by new business production in our Other Professional Liability and E&O divisions.

Average renewal premium rates for our Int’l Insurance reporting segment for the three months ended September 30, 2017 decreased 3.5% compared to the same period in 2016, driven by decreases of 6.5%, 3.0% and 1.6% in our P&C, Professional Liability and Marine operating segments, respectively.

Year to Date Variance

Gross Written Premiums increased $2.3 million for the nine months ended September 30, 2017 compared to the same period in 2016, driven by increases in our Professional Liability and Marine operating segments of $14.4 million and $8.6 million, respectively, partially offset by a decline in our P&C operating segment of $20.7 million.

The increase in our Marine operating segment was largely due to growth in our Protection & Indemnity and Hull products driven by new business, an increase in our Craft product related to the renewal of certain business previously managed by our U.S. Insurance reporting segment now managed in our Int’l Insurance reporting segment, and an increase in our Transport product related to an increased premium estimate. These increases were partially offset by a decline in our Specie product driven by non-renewals and rate reductions as a result of difficult market conditions.

The decrease in our P&C operating segment was primarily driven by a decline in our Property and Energy & Engineering divisions, partially offset by increases in our Political Violence & Terrorism product and General Liability division. The decrease in our Property division was related to strategic actions taken to exit our North American Property business. Our Energy & Engineering division decrease was primarily related to a lower premium volume in our Other Energy & Engineering product, partially offset by new business production during the third quarter in our Offshore Energy product. The increase in our Political Violence & Terrorism product was driven by new business. The increase in our General Liability division was driven by new business and an increased premium estimate.

The increase in our Professional Liability operating segment was attributable to the same drivers as the quarter to date variance.

Average renewal premium rates for our Int’l Insurance reporting segment for the nine months ended September 30, 2017 decreased 2.7% compared to the same period in 2016, driven by decreases of 4.5%, 2.3% and 1.6% in our P&C, Professional Liability and Marine operating segments, respectively.

Ceded Written Premiums

Quarter to Date Variance

Ceded Written Premiums were $39.0 million, resulting in a retention ratio of 65.7% of Net Written Premiums to Gross Written Premiums for the three months ended September 30, 2017 compared to $35.2 million and a retention ratio of 66.3%, for the same period in 2016. The decrease in the retention ratio was driven by the P&C operating segment, partially offset by an increase in the retention ratio of our Marine operating segment.

The increase in the retention ratio in our Marine operating segment was the result of an increased ceded premium estimate booked in the prior year impacting our Protection & Indemnity product, Marine Liability premium estimate decreases booked in the prior year and changes in our proportional reinsurance programs. These increases in the retention ratio were partially offset by the impact of an increase in ceded RRPs related to Hurricanes Irma and Harvey.

The reduction in the retention ratio in our P&C operating segment was primarily driven by a reinsurance arrangement to cede 100% of the unexpired risk on our North American Property business effective January 1, 2017 as part of strategic actions taken to exit this book of business, the impact of an increase in ceded RRPs related to Hurricanes Irma, Maria and Harvey and an increase in excess of loss reinsurance.

Year to Date Variance

Ceded Written Premiums were $129.4 million, resulting in a retention ratio of 66.5%, for the nine months ended September 30, 2017 compared to $112.1 million and a retention ratio of 70.8%, for the same period in 2016. The reduction in the retention ratio was driven

42

by our P&C operating segment attributable to the same drivers as the quarter to date variance. This was partially offset by an increase in our Marine operating segment, attributable to the same drivers as the quarter to date variance.

Net Earned Premiums

Quarter and Year to Date Variances

Net Earned Premiums increased $4.6 million and $15.0 million for the three and nine months ended September 30, 2017 as compared to the same periods in 2016 driven by increases in our Marine and Professional Liability operating segments, partially offset by a decrease in our P&C operating segment.

The increase in our Marine operating segment’s Net Earned Premium was primarily driven by growth in this segment along with an increased ceded premium estimate booked in the prior year impacting our Protection & Indemnity product and Marine Liability premium estimate decreases booked in the prior year. These increases in Net Earned Premiums were partially offset by an increase in ceded RRPs related to Hurricanes Irma and Harvey.

The decrease in our P&C operating segment’s Net Earned Premium was primarily due to lower premium volume and increased cessions related to strategic actions taken to exit our North American Property business and an increase in ceded RRPs related to Hurricanes Irma, Maria and Harvey. This decrease was partially offset by growth in our Political Violence & Terrorism and General Liability products.

The increase in our Professional Liability operating segment’s Net Earned Premium was driven by growth in our Other Professional Liability and E&O divisions.

Net Losses and LAE

The Net Losses and LAE Reserves as of September 30, 2017 and December 31, 2016 are as follows:

	Int'l Insurance
	As of September 30, 2017								As of December 31, 2016
amounts in thousands	Marine		P&C		Professional Liability		Total		Marine		P&C		Professional Liability		Total		Total% Change
Case Reserves	$	170,658	$	64,255	$	40,178	$	275,091	$	163,124	$	66,496	$	30,106	$	259,726		5.9	%
IBNR Reserves		51,094		42,680		76,618		170,392		36,118		18,192		70,103		124,413		37.0	%
Total	$	221,752	$	106,935	$	116,796	$	445,483	$	199,242	$	84,688	$	100,209	$	384,139		16.0	%

The following table presents the impact of net RRPs and Reserve Releases or (Development/Strengthening) on our Net Losses and LAE Ratio for the three months ended September 30, 2017 and 2016:

	Int'l Insurance
	Three Months Ended September 30, 2017												Three Months Ended September 30, 2016
							Professional												Professional						Point
	Marine			P&C			Liability			Total			Marine			P&C			Liability			Total			Change
Reported Net Losses and LAE Ratio		101.1	%		137.4	%		52.3	%		96.8	%		49.7	%		62.8	%		60.2	%		56.5	%		40.3
Net RRPs		(3.1	%)		(11.5	%)		0.0	%		(3.5	%)		0.0	%		0.2	%		0.0	%		0.1	%		(3.6	)
Additional Net Current AY Reserve    Release/(Development)		(29.8	%)		(72.8	%)		0.0	%		(33.4	%)		(24.1	%)		(9.6	%)		0.0	%		(13.6	%)		(19.8	)
Net Prior AY Reserve    Release/(Strengthening)		(17.6	%)		(8.3	%)		(7.0	%)		(12.2	%)		23.2	%		(12.1	%)		(10.9	%)		3.6	%		(15.8	)
Adjusted Net Losses and LAE Ratio		50.6	%		44.8	%		45.3	%		47.7	%		48.8	%		41.3	%		49.3	%		46.6	%		1.1

Quarter to Date Variance

For the three months ended September 30, 2017, our Reported Net Losses and LAE Ratio increased 40.3 points as compared to the same period in 2016 driven by increases in our Marine and P&C operating segments, partially offset by a decrease in our Professional Liability operating segment.

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For the three months ended September 30, 2017, our Reported Net Losses and LAE Ratio for our Marine operating segment increased 51.4 points as compared to the same period in 2016, primarily driven by:

• $7.1 million of Net Prior AY Reserve Strengthening due to adverse loss development for the three months ended September 30, 2017 related to our Cargo, Protection & Indemnity and Specie products. This compares to $8.1 million of Net Prior AY Reserve Releases due to better than expected loss emergence for the same period in 2016.

• $12.0 million of Additional Net Current AY Reserve Development for the three months ended September 30, 2017 primarily attributable to catastrophe losses of $10.8 million from Hurricanes Maria, Harvey and Irma. This compared to $8.4 million for the same period in 2016, mostly related to a satellite loss.

• A $1.2 million ceded RRP expense generated by the catastrophe losses this quarter.

• Changes in the mix of business are driving the 1.8 point increase in the Adjusted Net Losses and LAE Ratio.

For the three months ended September 30, 2017, the Reported Net Losses and LAE Ratio for our P&C operating segment increased 74.6 points as compared to the same period in 2016. This was primarily driven by:

• $17.3 million of Additional Net Current AY Reserve Development for the three months ended September 30, 2017 primarily attributable to catastrophe losses of $15.5 million from Hurricanes Irma, Maria and Harvey and $1.8 million from the Puebla, Mexico Earthquake. This compares to $2.4 million for the same period in 2016, mostly attributable to weather-related losses in our Property division.

• A $2.0 million ceded RRP expense was generated by the catastrophe losses this quarter.

• Changes in the mix of business in our Energy and Engineering divisions are driving the 3.5 point increase in the Adjusted Net Losses and LAE Ratio.

Partially offsetting these increases to the Reported Net Losses and LAE Ratio;

• $2.0 million of Net Prior AY Reserve Strengthening for the three months ended September 30, 2017 related to our Property product, compared to $3.2 million of Net Prior AY Reserve Strengthening for the same period in 2016 ($7.7 million of adverse development attributable to increased weather-related losses in our Property division, partially offset by $4.5 million of better than expected loss emergence in our Offshore Energy product).

For the three months ended September 30, 2017, our Reported Net Losses and LAE Ratio for our Professional Liability operating segment decreased 7.9 points as compared to the same period in 2016, primarily due to:

• Favorable performance across certain key divisions and changes in the mix of business driving the 4.0 point decrease in Adjusted Net Losses and LAE Ratio.

• $1.7 million of Net Prior AY Reserve Strengthening for the three months ended September 30, 2017 related to a large loss in our E&O product. This compares to $2.1 million of Net Prior AY Reserve Strengthening related to bad debt expense due to lower expectations of recoveries from a large reinsurer for the same period in 2016.

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The following table presents the impact of net RRPs and Reserve Releases or (Development/Strengthening) on our Net Losses and LAE Ratio for the nine months ended September 30, 2017 and 2016:

	Int'l Insurance
	Nine Months Ended September 30, 2017												Nine Months Ended September 30, 2016
							Professional												Professional						Point
	Marine			P&C			Liability			Total			Marine			P&C			Liability			Total			Change
Reported Net Losses and LAE Ratio		72.3	%		81.2	%		56.4	%		70.4	%		49.6	%		69.6	%		54.2	%		56.7	%		13.7
Net RRPs		(0.8	%)		(1.6	%)		0.0	%		(0.7	%)		(0.2	%)		(1.7	%)		0.0	%		(0.5	%)		(0.2	)
Additional Net Current AY Reserve    Release/(Development)		(14.9	%)		(26.7	%)		0.0	%		(14.1	%)		(9.1	%)		(21.4	%)		0.0	%		(10.7	%)		(3.4	)
Net Prior AY Reserve    Release/(Strengthening)		(8.7	%)		(8.0	%)		(9.5	%)		(8.7	%)		10.5	%		(5.6	%)		(3.8	%)		2.3	%		(11.0	)
Adjusted Net Losses and LAE Ratio		47.9	%		44.9	%		46.9	%		46.9	%		50.8	%		40.9	%		50.4	%		47.8	%		(0.9	)

Year to Date Variance

For the nine months ended September 30, 2017, our Reported Net Losses and LAE Ratio increased 13.7 points as compared to the same period in 2016 driven by our Marine, P&C and Professional Liability operating segments.

For the nine months ended September 30, 2017, our Reported Net Losses and LAE Ratio for our Marine operating segment increased 22.7 points as compared to the same period in 2016, primarily driven by:

• $10.2 million of Net Prior AY Reserve Strengthening due to adverse loss development for the nine months ended September 30, 2017 primarily related to our Cargo, Specie and Protection & Indemnity products. This compares to $11.5 million of Net Prior AY Reserve Releases due to better than expected loss emergence for the same period in 2016.

• $17.4 million of Additional Net Current AY Reserve Development for the nine months ended September 30, 2017 primarily attributable to catastrophe losses of $10.8 million from Hurricanes Maria, Harvey and Irma, and $6.6 million due to large loss activity in our P&I product. This compares to $10.0 million for the same period in 2016, consisting primarily of $1.7 million attributable to the Ecuador Earthquake and $7.9 million from our Cargo product relating to a satellite loss.

• A $1.3 million ceded RRP expense primarily due to the catastrophe losses for the nine months ended September 30, 2017, compared to a $0.4 million expense for the same period in 2016.

Partially offsetting these increases to the Reported Net Losses and LAE Ratio;

• Changes in the mix of business are driving the 2.9 point decrease in Adjusted Net Losses and LAE Ratio.

The Reported Net Losses and LAE Ratio for our P&C operating segment increased 11.6 points as compared to the same period in 2016. This was primarily driven by:

• $18.3 million of Additional Net Current AY Reserve Development for the nine months ended September 30, 2017 primarily attributable to catastrophe losses of $15.5 million from Hurricanes Irma, Maria and Harvey and $1.8 million from the Puebla, Mexico Earthquake and $1.0 million of large losses in our Property product. This compares to $15.5 million for the same period in 2016, consisting of catastrophe losses of $8.8 million attributable to the Alberta Wildfires and Taiwan Earthquake, $5.7 million from our Property division due to weather-related losses and $1.0 million of adverse loss emergence from our Energy & Engineering division.

• The impact of additional ceded protection on Net Earned Premiums driving the 4.0 point increase in Adjusted Net Losses and LAE Ratio.

• $5.5 million of Net Prior AY Reserve Strengthening for the nine months ended September 30, 2017 related to loss development in our Property division primarily resulting from late reported claims, partially offset by releases related to better than expected loss emergence within our Offshore Energy business. This compares to $4.0 million of Net Prior AY reserve strengthening due to $10.1 million of increased weather-related losses in our Property division, partially offset by $6.0 million of favorable loss emergence in our Offshore Energy product for the same period in 2016.

Partially offsetting these increases to the Reported Net Losses and LAE Ratio;

45

• A $1.4 million RRP expense primarily due to the catastrophe losses this quarter, compared to a $1.8 million expense for the same period in 2016.

For the nine months ended September 30, 2017, our Reported Net Losses and LAE Ratio for our Professional Liability operating segment increased 2.2 points as compared to the same period in 2016, primarily due to:

• $6.4 million of Net Prior AY Reserve Strengthening for the three months ended September 30, 2017 related to large loss development on our D&O and E&O business. This compares to $2.1 million of Net Prior AY Reserve Strengthening related to bad debt expense due to lower expectations of recoveries from a large reinsurer for the same period in 2016.

Partially offsetting this decrease to the Reported Net Losses and LAE Ratio;

• Favorable performance across certain key divisions and changes in the mix of business driving the 3.5 point decrease in Adjusted Net Losses and LAE Ratio.

Commission Expenses

Quarter to Date Variance

Our Commission Expense Ratio for the three months ended September 30, 2017 was comparable to the same period in 2016. A decrease in our Marine and P&C operating segments was offset by an increase in our Professional Liability operating segment.

Our Marine operating segment’s Commission Expense Ratio decreased due to lower profit commissions compared to the prior year and the Net Earned Premiums impact of RRPs related to Hurricanes Irma and Harvey.

The decrease in our P&C operating segment’s Commission Expense Ratio was due to the impact of increased cessions on our Property business and the Net Earned Premiums impact of RRPs related to Hurricanes Irma, Maria and Harvey, partially offset by an increase in our Political Violence & Terrorism product, which has a higher commission rate, and an increase in profit commissions.

The increase in our Professional Liability operating segment’s Commission Expense Ratio was due to increased gross costs and changes in the mix of business as a result of increased growth in our Warranties and Indemnity product, which attracts a higher commission rate, partially offset by a decrease in profit commission expense.

Year to Date Variance

Our Commission Expense Ratio for the nine months ended September 30, 2017 increased 1.5 points as compared to the same period in 2016, primarily from our Professional Liability operating segment attributable to the same drivers as the quarter to date variance.

Other Operating Expenses

Quarter and Year to Date Variances

For the three and nine months ended September 30, 2017, Other Operating Expenses decreased $3.8 million and $6.3 million, respectively, as compared to the same periods in 2016 due to a reduction in performance-based incentive compensation costs, reduced employee expenses and favorable foreign exchange rates, partially offset by increased Lloyd’s expenses.

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GlobalRe

The following tables summarize our Underwriting Profit for our GlobalRe reporting segment for the three and nine months ended September 30, 2017 and 2016:

	GlobalRe
	Three Months Ended September 30,
amounts in thousands	2017			2016			% Change
Gross Written Premiums	$	53,385		$	35,799			49.1	%
Ceded Written Premiums		(2,728	)		(1,376	)		98.3	%
Net Written Premiums		50,657			34,423			47.2	%
Net Earned Premiums	$	47,798		$	42,527			12.4	%
Net Losses and LAE		(59,118	)		(21,430	)	NM
Commission Expenses		(11,233	)		(8,951	)		25.5	%
Other Operating Expenses		(4,010	)		(4,437	)		(9.6	%)
Other Underwriting Income		94			122			(23.0	%)
Underwriting Profit (Loss)	$	(26,469	)	$	7,831		NM
Losses and LAE Ratio		123.7	%		50.4	%
Commission Expense Ratio		23.5	%		21.0	%
Other Operating Expense Ratio (1)		8.2	%		10.2	%
Combined Ratio		155.4	%		81.6	%

(1) - Includes Other Operating Expenses and Other Underwriting Income.

NM - Percentage change not meaningful

	GlobalRe
	Nine Months Ended September 30,
amounts in thousands	2017			2016			% Change
Gross Written Premiums	$	188,025		$	127,787			47.1	%
Ceded Written Premiums		(9,021	)		(7,467	)		20.8	%
Net Written Premiums		179,004			120,320			48.8	%
Net Earned Premiums	$	130,487		$	118,312			10.3	%
Net Losses and LAE		(106,932	)		(68,176	)		56.8	%
Commission Expenses		(28,695	)		(24,188	)		18.6	%
Other Operating Expenses		(14,403	)		(14,175	)		1.6	%
Other Underwriting Income		439			374			17.4	%
Underwriting Profit (Loss)	$	(19,104	)	$	12,147		NM
Losses and LAE Ratio		81.9	%		57.6	%
Commission Expense Ratio		22.0	%		20.4	%
Other Operating Expense Ratio (1)		10.7	%		11.7	%
Combined Ratio		114.6	%		89.7	%

(1) - Includes Other Operating Expenses and Other Underwriting Income.

NM - Percentage change not meaningful

Gross Written Premiums

Quarter To Date Variance

Gross Written Premiums increased $17.6 million for the three months ended September 30, 2017, compared to the same period in 2016, primarily due to increases in our A&H, P&C, Surety and Agriculture products. The increase in our A&H product was driven by new business and the timing of one large renewal, partially offset by a decreased premium estimate. The increase in our P&C product was due to assumed RRPs related to Hurricanes Irma, Maria and Harvey and new business, partially offset by increased premium estimates that occurred in the prior year with minor corresponding adjustments in the current period. The increase in our Surety product is driven primarily by increased renewal business along with increased premium estimates. The increase in our Agriculture product is due to new business, partially offset by nonrenewals.

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Year To Date Variance

Gross Written Premiums increased $60.2 million for the nine months ended September 30, 2017, compared to the same period in 2016, with growth across all of our segment’s products. Our A&H product had significant growth increasing $31.8 million attributable to new business, increased renewal business and the timing of one large renewal. Growth in our P&C, Agriculture and Surety businesses as well as expansion of our Professional Liability product to offer various assumed general, umbrella and auto liability business further contributed to new business growth, period over period.

Ceded Written Premiums

Quarter To Date Variance

Ceded Written Premiums were $2.7 million, resulting in a retention ratio of 94.9% of Net Written Premiums to Gross Written Premiums for the three months ended September 30, 2017 compared to $1.4 million and a retention ratio of 96.2%, for the same period in 2016. The decrease in the retention ratio was primarily driven by the impact of ceded RRPs resulting from Hurricane Maria. This decrease was partially offset by changes in the mix of business with proportionately more A&H and Agriculture premium, which have 100% retention.

Year To Date Variance

Ceded Written Premiums were $9.0 million, resulting in a retention ratio of 95.2%, for the nine months ended September 30, 2017 compared to $7.5 million and a retention ratio of 94.2%, for the same period in 2016. The increase in the retention ratio was primarily due to changes in the mix of business with proportionately more A&H, Agriculture and Professional Liability premium, which have 100% retention. This increase was partially offset by the impact of ceded RRPs resulting from Hurricane Maria.

Net Earned Premiums

Quarter and Year To Date Variances

Net Earned Premiums for the three and nine months ended September 30, 2017 increased $5.3 million and $12.2 million, respectively, as compared to the same periods in 2016, primarily due to continued growth in our Agriculture, P&C, Professional Liability and Surety products and an increase in net assumed RRPs related to Hurricanes Irma and Harvey (assumed RRPs of $4.3 million, partially offset by ceded RRPs of $1.8 million), partially offset by a lower volume of premium from our A&H products earning into 2017 as compared to 2016, due to non-renewals in 2016.

Net Losses and LAE

The Net Losses and LAE Reserves as of September 30, 2017 and December 31, 2016 are as follows:

	GlobalRe
	As of
	September 30,		December 31,
amounts in thousands	2017		2016		% Change
Case Reserves	$	50,351	$	47,505		6.0	%
IBNR Reserves		109,954		67,856		62.0	%
Total	$	160,305	$	115,361		39.0	%

The following table presents the impact of net RRPs and Reserve Releases or (Development/Strengthening) on our Net Losses and LAE Ratio for the three months ended September 30, 2017 and 2016: 

	GlobalRe
	Three Months Ended September 30,						Point
	2017			2016			Change
Reported Net Losses and LAE Ratio		123.7	%		50.4	%		73.3
Net RRPs		7.6	%		0.5	%		7.1
Additional Net Current AY Reserve Release/(Development)		(81.2	%)		(3.4	%)		(77.8	)
Net Prior AY Reserve Release/(Strengthening)		(0.9	%)		7.3	%		(8.2	)
Adjusted Net Losses and LAE Ratio		49.2	%		54.8	%		(5.6	)

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Quarter To Date Variance

For the three months ended September 30, 2017, our Reported Net Losses and LAE Ratio increased 73.3 points as compared to the same period in 2016. This was primarily driven by:

• $36.6 million of Additional Net Current AY Reserve Development for the three months ended September 30, 2017 primarily attributable to catastrophe losses of $34.1 million from Hurricanes Maria, Irma and Harvey and $1.8 million from the Puebla, Mexico Earthquake. This compares to $1.4 million of losses for the same period in 2016 on our P&C product.

• $0.4 million of Net Prior AY Reserve Strengthening for the three months ended September 30, 2017, as compared to $3.1 million of Net Prior AY Reserve Releases for the same period in 2016, primarily related to our A&H product for the three months ended September 30, 2016.

Partially offsetting these decreases to the Reported Net Losses and LAE Ratio,

• A net $2.8 million RRP expense primarily due to the catastrophe losses this quarter (with the quarter events consisting of $4.3 million of assumed RRPs, partially offset by $1.8 million of ceded RRPs), compared to a $0.7 million net RRP benefit for the same period in 2016.

• The Adjusted Net Losses and LAE Ratio decreased 5.6 points due to changes in mix of business with proportionally less earnings coming from our A&H product, which carries a higher loss ratio, and an increase in earnings from our P&C and Surety products, which carry lower loss ratios.

The following table presents the impact of net RRPs and Reserve Releases or (Development/Strengthening) on our Net Losses and LAE Ratio for the nine months ended September 30, 2017 and 2016: 

	GlobalRe
	Nine Months Ended September 30,						Point
	2017			2016			Change
Reported Net Losses and LAE Ratio		81.9	%		57.6	%		24.3
Net RRPs		2.3	%		0.4	%		1.9
Additional Net Current AY Reserve Release/(Development)		(31.5	%)		(7.3	%)		(24.2	)
Net Prior AY Reserve Release/(Strengthening)		(3.4	%)		3.8	%		(7.2	)
Adjusted Net Losses and LAE Ratio		49.3	%		54.5	%		(5.2	)

Year To Date Variance

For the nine months ended September 30, 2017, our Reported Net Losses and LAE Ratio increased 24.3 points as compared to the same period in 2016. This was primarily driven by:

• $40.0 million of Additional Net Current AY Reserve Development for the nine months ended September 30, 2017 primarily attributable to catastrophe losses of $34.1 million from Hurricanes Maria, Irma and Harvey, $1.8 million from the Puebla, Mexico Earthquake, and $3.4 million from other weather-related losses during the year. This is compared to $8.6 million for the same period in 2016, mostly related to catastrophe losses including the Alberta Wildfires, Ecuador Earthquake and the Taiwan Earthquake.

• $4.3 million of Net Prior AY Reserve Strengthening for the nine months ended September 30, 2017 mostly related to a $4.7 million loss as a result of a large A&H claim, compared to $4.5 million of Net Prior AY Reserve Releases for the same period in 2016, related to our A&H product.

Partially offsetting these decreases to the Reported Net Losses and LAE Ratio,

• A $3.6 million net RRP benefit was primarily due to the catastrophe losses this quarter (with the quarter events consisting of $4.3 million of assumed RRPs, partially offset by $1.8 million of ceded RRPs), compared to a $1.1 million RRP benefit for the same period in 2016.

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• The Adjusted Net Losses and LAE Ratio decreased 5.2 points year over year due to changes in mix of business with proportionally less earnings coming from our A&H product, which carries a higher loss ratio, and an increase in earnings from our P&C and Surety products, which carry lower loss ratios.

Commission Expenses

Quarter To Date Variances

Our Commission Expense Ratio for the three months ended September 30, 2017 increased 2.5 points compared to the same period in 2016, due to higher profit commission expense particularly in our Surety, A&H and Professional Liability products and changes in the mix of business, partially offset by the effect of fully earned net RRPs from Hurricanes Irma, Harvey and Maria.

Year To Date Variance

Our Commission Expense Ratio for the nine months ended September 30, 2017 increased 1.6 points compared to the same period in 2016. The year to date increase was attributable to the same drivers as the quarter to date variance.

Other Operating Expenses

Quarter and Year To Date Variances

Other Operating Expenses for the three months ended September 30, 2017 decreased $0.4 million as compared to the same period in 2016, primarily due to a reduction in performance-based incentive compensation costs, partially offset by costs associated with new business initiatives.

Year To Date Variances

Other Operating Expenses for the nine months ended September 30, 2017 increased $0.2 million as compared to the same period in 2016, primarily due to costs associated with new business initiatives, partially offset by a reduction in performance-based incentive compensation costs.

Capital Resources and Liquidity

Capital Resources

Our capital resources consist of funds deployed or available to be deployed to support our business operations.  As of September 30, 2017 and December 31, 2016, our capital resources were as follows:

	As of
amounts in thousands	September 30, 2017			December 31, 2016
Senior Notes	$	263,845		$	263,728
Stockholders' Equity		1,224,191			1,178,188
Total Capitalization	$	1,488,036		$	1,441,916
Ratio of Debt to Total Capitalization		17.7	%		18.3	%

As part of our capital management program, we may seek to raise additional capital or may seek to return capital to our stockholders through share repurchases, cash dividends or other methods (or a combination of such methods).  Any such determination will be at the discretion of our Parent Company’s Board of Directors and will be dependent upon our profits, financial requirements and other factors, including legal restrictions, rating agency requirements, credit facility limitations and such other factors as our Board of Directors deems relevant.

We primarily rely upon dividends from our subsidiaries to meet our Parent Company’s obligations.  Our Parent Company’s cash obligations primarily consist of semi-annual (April and October) interest payments of $7.6 million on the Senior Notes.

NIC may pay dividends to our Parent Company out of its statutory earned surplus subject to statutory restrictions imposed under the New York insurance law.  As of September 30, 2017, the maximum amount available for the payment of dividends by NIC in 2017 without prior regulatory approval is $102.7 million.

NCUL, our wholly-owned corporate member at Lloyd’s, may pay dividends to our Parent Company up to the extent of available profits that have been distributed from the Syndicate.  As of September 30, 2017, that amount was $678.5 million (£ 506.5 million).

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Senior Notes and Credit Facility

As of September 30, 2017, letters of credit with an aggregate face amount of 14.0 million Australian Dollars were outstanding under the credit facility with Barclays Bank PLC that we entered into on November 4, 2016 (the “Australian Facility”).

As of September 30, 2017, letters of credit with an aggregate face amount of $135.0 million and £60.0 million were outstanding under the credit facility with ING Bank N.V., London Branch, individually and as administrative agent for a syndicate of lenders, that we entered into on November 7, 2016 (the “Club Facility”), and we had an aggregate of $1.1 million of cash collateral posted.  

As of September 30, 2017, there were no letters of credit outstanding under the credit facility with ING Bank N.V., London Branch, we entered into on November 20, 2015 and amended on November 7, 2016 (the “Bilateral Facility”).

As of September 30, 2017, our Company was in compliance with all covenants for our Senior Notes, Australian Facility, Club Facility and Bilateral Facility.

Consolidated Cash Flows

We believe that the cash flow generated by the operating activities of our subsidiaries will provide sufficient funds for us to meet our liquidity needs over the next twelve months.  Beyond the next twelve months, cash flow available to us may be influenced by a variety of factors, including general economic conditions and conditions in the insurance and reinsurance markets, as well as fluctuations from year to year in claims experience.

We believe that we have adequately managed our cash flow requirements related to reinsurance recoveries from their positive cash flows and the use of available short-term funds when applicable.  However, there can be no assurances that we will be able to continue to adequately manage such recoveries in the future or that collection disputes or reinsurer insolvencies will not arise that could materially increase the collection time lags or result in recoverable write-offs causing additional incurred losses and liquidity constraints to our Company.  The payment of gross claims and related collections from reinsurers with respect to large losses could significantly impact our liquidity needs.  However, in general, we expect to collect our paid reinsurance recoverables under the terms described above.  

Net Cash Provided by Operating Activities was $222.8 million for the nine months ended September 30, 2017 compared to $191.3 million for the same period in 2016. Operating cash flows increased from the prior year due to higher underwriting cash flows associated with the growth of our business, coupled with increased investment income collections due to growth in invested assets and higher yields. These increases were partially offset by higher estimated federal tax payments in the current year due to less overpayment carryforwards which were used to offset tax payments in the prior year.

Net Cash Used in Investing Activities was $217.4 million for the nine months ended September 30, 2017 compared to $99.0 million for the comparable period in 2016.  The increase in cash used in investing activities is primarily related to the sale of short-term investments in 2016 which were used to capitalize our U.K. based insurance company, NIIC. In comparison, purchases of short-term investments were made during 2017 as we look to shorten duration following the September Treasury market rally and hold additional liquidity to fund catastrophe related claims arising in the third quarter. The remaining fluctuation in investing cash flows is the result of changes in operating cash flows and the associated ongoing management of our investment portfolio.

Net Cash Used in Financing Activities was $16.4 million for the nine months ended September 30, 2017 compared to $5.9  million for the same period in 2016. The increase in cash used in financing activities is primarily related to increased tax withholding payments on vested stock compensation in 2017 as compared with 2016. To a lesser extent 2017 financing cash flows were impacted by the institution of a quarterly stockholder dividend which was paid for the first time in the third quarter of 2016.

Investments

Our investment portfolio is invested primarily in publicly traded, investment grade, fixed income securities with an average credit quality of “AA-/Aa3” as rated by S&P or Moody’s.  As of September 30, 2017, our portfolio had a duration of 3.6 years.  Management periodically projects cash flow of the investment portfolio and other sources in order to maintain the appropriate levels of liquidity in an effort to ensure our ability to satisfy claims.  As of September 30, 2017 and December 31, 2016, all Fixed Maturities and Equity Securities held by us were classified as available-for-sale.

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The portfolio is externally managed by independent, professional investment managers and is broadly diversified across geographies, sectors, and issuers. The primary objectives are to maximize total investment return in the context of preserving and enhancing stockholder value and the statutory surplus of our regulated insurance companies.  As part of our overall investment strategy, we seek to build a tax efficient investment portfolio by maintaining an allocation to tax-exempt municipal bonds. The tax-exempt portion of our Fixed Maturities portfolio at September 30, 2017 was 20.2% compared to 17.1% at December 31, 2016.  Additionally, substantially all of our equity portfolio is invested in tax efficient securities which qualify for the dividends received deduction.  The investments are subject to the oversight of the respective insurance companies’ Boards of Directors and the Finance Committee of our Parent Company’s Board of Directors.

We are a specialty insurance company and periods of moderate economic recession or inflation tend not to have a significant direct effect on underwriting operations.  They do, however, impact our investment portfolio.  A decrease in interest rates will tend to decrease our yield and have a positive effect on the fair value of our invested assets.  An increase in interest rates will tend to increase our yield and have a negative effect on the fair value of our invested assets.

The following table summarizes the composition of our available-for-sale investments at fair value:

	Fair Value as of
amounts in thousands	September 30, 2017		December 31, 2016		% Change
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	269,851	$	273,776		(1.4	%)
States, Municipalities and Political Subdivisions		684,792		547,415		25.1	%
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		426,441		487,364		(12.5	%)
Residential Mortgage Obligations		34,748		20,530		69.3	%
Asset-Backed Securities		331,646		314,601		5.4	%
Commercial Mortgage-Backed Securities		140,601		154,139		(8.8	%)
Subtotal	$	933,436	$	976,634		(4.4	%)
Corporate Exposures		910,106		838,057		8.6	%
Total Fixed Maturities	$	2,798,185	$	2,635,882		6.2	%
Equity Securities:
Common Stocks	$	180,771	$	164,087		10.2	%
Preferred Stocks		195,105		185,055		5.4	%
Total Equity Securities	$	375,876	$	349,142		7.7	%
Short-Term Investments		247,607		143,539		72.5	%
Total Investments	$	3,421,668	$	3,128,563		9.4	%

Invested assets increased from December 31, 2016 due to positive cash flow from operations, and to a lesser extent an increase in unrealized gains. Operating cash flows were primarily directed to Corporate Exposures and Municipal Bonds.  Additionally, Corporate Exposures, Municipal Bonds and Equity Securities benefitted from a rally in the Treasury and equity markets which resulted in increased unrealized gains for these asset classes. The increase in Short-Term Investments is due to operating cash flows invested in Short-Term Investments as we shortened duration following the September Treasury market rally.

The following table sets forth the amount of our Fixed Maturities as of September 30, 2017 by S&P credit rating or, if an S&P rating is not available, the equivalent Moody’s rating. The total rating is the weighted average quality rating for the Fixed Maturities portfolio as a whole.

		As of September 30, 2017
amounts in thousands	Rating	Fair Value		AmortizedCost
Rating Description:
Extremely Strong	AAA	$	399,400	$	391,695
Very Strong	AA		1,161,524		1,147,367
Strong	A		740,483		730,446
Adequate	BBB		370,468		361,547
Speculative	BB & Below		118,844		113,664
Not Rated	NR		7,466		7,383
Total	AA-	$	2,798,185	$	2,752,102

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The following table sets forth the composition of the non-government guaranteed Fixed Maturities categorized by asset class and generally equivalent S&P and Moody’s ratings (not all securities in our portfolio are rated by both S&P and Moody’s) as of September 30, 2017:

	As of September 30, 2017
amounts in thousands	AAA		AA		A		BBB		BBand below		Not Rated		FairValue		Amortized Cost
Municipal Bonds	$	60,788	$	435,553	$	166,560	$	21,891	$	—	$	—	$	684,792	$	665,630
Agency Residential Mortgage-Backed		—		426,441		—		—		—		—		426,441		427,374
Residential Mortgage-Backed		10,600		5,204		65		14,099		4,314		466		34,748		34,205
Asset-Backed		126,121		60,202		109,437		28,886		—		7,000		331,646		329,569
Commercial Mortgage-Backed		92,685		33,766		14,150		—		—		—		140,601		139,167
Corporate Exposures		6,821		54,997		428,166		305,592		114,530		—		910,106		893,868
Total	$	297,015	$	1,016,163	$	718,378	$	370,468	$	118,844	$	7,466	$	2,528,334	$	2,489,813

The following table sets forth our U.S. Treasury Bonds, Agency Bonds and Foreign Government Bonds, as well as our State, Municipality and Political Subdivision bond holdings by type:

	As of September 30, 2017
amounts in thousands	FairValue		AmortizedCost
U.S. Treasury Bonds, Agency Bonds and Foreign Government    Bonds:
U.S. Treasury Bonds	$	51,612	$	50,792
Agency Bonds		88,075		87,536
Foreign Government Bonds		130,164		123,961
Total U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	269,851	$	262,289
States, Municipalities and Political Subdivisions:
General Obligation	$	171,690	$	167,516
Prerefunded		28,053		26,896
Revenue		364,365		351,485
Taxable		120,684		119,733
Total States, Municipalities and Political Subdivisions	$	684,792	$	665,630

As of September 30, 2017, we own $49.3 million of municipal securities, which are credit enhanced by various financial guarantors that have an average underlying credit rating of A+.  

The following table sets forth our Agency Mortgage-Backed Securities (“AMBS”) issued by the Government National Mortgage Association (“GNMA”), Federal National Mortgage Association (“FNMA”) and Federal Home Loan Mortgage Corporation (“FHLMC”) and the quality category (Prime, Alternative A-paper (“Alt-A”), Non-U.S. RMBS and Other Non-Agency) for Residential Mortgage-Backed Securities (“RMBS”) as of September 30, 2017:

	As of September 30, 2017
amounts in thousands	Fair Value		AmortizedCost
AMBS:
GNMA	$	45,698	$	44,866
FNMA		268,683		270,210
FHLMC		112,060		112,298
Total Agency Mortgage-Backed Securities	$	426,441	$	427,374
RMBS:
Prime	$	23,204	$	22,754
Alt-A		944		860
Other  Non-Agency		10,600		10,591
Total Residential Mortgage-Backed Securities	$	34,748	$	34,205

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We analyze our Mortgage-Backed Securities by credit quality of the underlying collateral distinguishing between the securities issued by FNMA, FHLMC and GNMA, which are federal government sponsored entities, and non-agency backed securities broken out by Prime, Alt-A, Non-U.S and Other Non-Agency collateral. The securities issued by FNMA and FHLMC are the obligations of each respective entity. The U.S. Department of the Treasury has agreed to provide support to FNMA and FHLMC under a Preferred Stock Purchase Agreement by committing to make quarterly payments to these enterprises, if needed, to maintain a zero net worth.

Prime collateral consists of mortgages or other collateral from the most creditworthy borrowers. Alt-A collateral consists of mortgages or other collateral from borrowers, which have a risk potential greater than Prime but less than subprime. The subprime collateral consists of mortgages or other collateral from borrowers with low credit ratings. We have no exposure to subprime RMBS at September 30, 2017. Prime, subprime and Alt-A categories are as defined by S&P.

Details of the collateral of our Asset-Backed Securities portfolio as of September 30, 2017 are presented below:

	As of September 30, 2017
amounts in thousands	Fair Value		AmortizedCost
Auto Loans	$	29,910	$	29,808
Single Family Rentals	$	33,191	$	32,751
Consumer Loans		47,555		47,490
Credit Cards		23,330		23,265
Collateralized Loan Obligations		112,481		112,237
Time Share		35,451		35,665
Miscellaneous		49,728		48,353
Total Asset-Backed Securities	$	331,646	$	329,569

Details of our Corporate Exposures portfolio as of September 30, 2017 are presented below:

	As of September 30, 2017
amounts in thousands	Fair Value		AmortizedCost
Corporate Exposures:
Corporate Bonds	$	730,032	$	721,125
Hybrid Bonds		152,311		146,438
Redeemable Preferred Stocks		27,763		26,305
Total Corporate Exposures	$	910,106	$	893,868

We hold non-sovereign securities where the issuer is located in the Euro Area, an economic and monetary union of certain member states within the European Union, that have adopted the Euro as their common currency. As of September 30, 2017, the fair value of such securities was $102.4 million, with an amortized cost of $101.9 million, representing 3.2% of our total Fixed Maturities and equity portfolio. Our largest exposure is in The Netherlands with a total of $36.7 million followed by France with a total of $31.6 million.  We have no direct exposure to Greece, Portugal, Italy or Spain within the Euro Area as of September 30, 2017.

The following table summarizes the gross unrealized investment losses as of September 30, 2017 by length of time where the fair value was less than 80% of amortized cost:

	As of September 30, 2017
	Fixed		Equity
amounts in thousands	Maturities		Securities		Total
Less than twelve months	$	—	$	41	$	41
Twelve months or longer		—		—		—
Total	$	—	$	41	$	41

Our Company had two credit related OTTI losses of $1.0 million in the equity portfolio during the three months ended September 30, 2017. Our Company had four credit related OTTI losses totaling $2.1 million in the equity portfolio during the nine months ended September 30, 2017. Our Company had no credit related OTTI losses during the three months ended September 30, 2016 and one credit related OTTI loss of $0.2 million in the Fixed Maturities portfolio for the nine months ended September 30, 2016.  

The fair value of our investment portfolio may fluctuate significantly in response to various factors such as changes in interest rates, investment quality ratings, equity prices, foreign exchange rates and credit spreads. We do not have the intent to sell nor is it more

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likely than not that we will have to sell Fixed Maturities in unrealized loss positions that are not other-than-temporarily impaired before recovery. For structured securities, default probability and severity assumptions differ based on property type, vintage and the stress of the collateral. We do not intend to sell any of these securities and it is more likely than not that we will not be required to sell these securities before the recovery of the amortized cost basis. For Equity Securities, we also consider our intent to hold securities as part of the process of evaluating whether a decline in fair value represents an other-than-temporary decline in value. We may realize investment losses to the extent our liquidity needs require the disposition of Fixed Maturity securities in unfavorable interest rate, liquidity or credit spread environments. Significant changes in the factors we consider when evaluating investments for impairment losses could result in a significant change in impairment losses reported in the Consolidated Financial Statements.

Reserves for Losses and LAE for Loss Events

Our Company monitors the development of paid and reported claims activities in relation to the estimate of ultimate losses established for loss events. Actual losses from such loss events may differ materially from the estimated losses generally due to the receipt of additional information from insureds or brokers, inflation in repair cost due to limited availability of labor and materials or the attribution of losses to coverages, which our Company assumed we would not have exposure to.

Hurricanes Harvey, Irma and Maria

Hurricanes Harvey, Irma and Maria occurred in the third quarter and generated substantial losses within our underwriting segments. The following table sets forth our gross and net losses and LAE reserves, incurred losses and LAE, and payments as of September 30, 2017:

	Three and Nine Months Ended September 30, 2017
amounts in thousands	Harvey		Irma		Maria
Gross of Reinsurance
Beginning Gross Reserves	$	—	$	—	$	—
Plus:  Incurred Losses & LAE		42,274		66,126		57,456
Less:  Calendar Year Payments		168		1,474		—
Less:  Foreign Currency Exchange Impact		—		—		—
Ending Gross Reserves	$	42,106	$	64,652	$	57,456
Gross Case Loss Reserves	$	7,765	$	1,337	$	1
Gross IBNR Loss Reserves		34,341		63,315		57,455
Ending Gross Reserves	$	42,106	$	64,652	$	57,456
Net of Reinsurance
Beginning Net Reserves	$	—	$	—	$	—
Plus:  Net Incurred Losses & LAE		17,101		25,805		26,391
Less:  Calendar Year Payments		—		1,391		—
Less:  Foreign Currency Exchange Impact		—		—		—
Ending Net Reserves	$	17,101	$	24,414	$	26,391
Net Case Loss Reserves	$	4,373	$	1,290	$	1
Net IBNR Loss Reserves		12,728		23,124		26,390
Ending Net Reserves	$	17,101	$	24,414	$	26,391

Our estimated net losses in relation to these events were derived from ground-up analysis of our in-force contracts providing coverage in the affected regions. These analyses include information from brokers or customers and also consider catastrophe modeling analyses, underwriter’s review of certain contracts and industry and/or statistical estimates. Our estimates remain subject to change as additional data becomes available.

The magnitude and complexity of losses arising from these events inherently increases the level of uncertainty as well as management judgment involved in determining our estimated net reserve for loss expenses. As a result, our actual losses from these events may ultimately differ materially from our current estimates.

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Critical Accounting Estimates

Our Company’s Annual Report on Form 10-K for the year ended December 31, 2016 discloses our critical accounting estimates (refer to Item 7 – Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Estimates).

We believe the items that require the most subjective and complex estimates involve the reporting of:

• Reserves for Losses and LAE (including losses that have occurred but were not reported to us by the financial reporting date);

• Reinsurance Recoverables, including a provision for uncollectible reinsurance;

• Written and Unearned Premiums;

• The recoverability of Deferred Tax Assets;

• The impairment of investment securities; and

• Valuation of invested assets.

We believe that the critical accounting estimates discussion in Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2016 continues to describe the significant estimates and judgements included in the preparation of our Consolidated Financial Statements.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Refer to Item 7A included in our Company’s 2016 Annual Report on Form 10-K. There have been no material changes to this item since December 31, 2016.

Item 4. Controls and Procedures

(a) Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, have evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), as of the end of the period covered by this Quarterly Report.  Based on such evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that as of the end of such period our Company’s disclosure controls and procedures are effective in identifying, on a timely basis, material information required to be disclosed in our reports filed or submitted under the Exchange Act.

(b) There have been no changes during our third fiscal quarter in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our Company’s internal control over financial reporting.

(c) In designing and evaluating the disclosure controls and procedures and internal control over financial reporting, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures and internal control over financial reporting must reflect the fact that management is required to apply judgment in evaluating the benefits of possible controls and procedures relative to their costs.

56

PART II - OTHER INFORMATION

Item 1. Legal Proceedings

In the ordinary course of conducting business, our subsidiaries are involved in various legal proceedings, either indirectly as insurers for parties or directly as defendants. Most of these proceedings consist of claims litigation involving our subsidiaries as either: (a) liability insurers defending or providing indemnity for third party claims brought against insureds or (b) insurers defending first party coverage claims brought against us. Our Company accounts for such activity through the establishment of unpaid losses and LAE reserves. Our Company’s management believes that our ultimate liability, if any, with respect to such ordinary-course claims litigation, after consideration of provisions made for potential losses and cost of defense, will not be material to the consolidated financial condition, results of operations, or cash flows of our Company.

Our subsidiaries are also occasionally involved with other legal actions, some of which assert claims for substantial amounts. These actions include claims asserting extra contractual obligations, such as claims involving allegations of bad faith in the handling of claims or the underwriting of policies. In general, our Company believes we have valid defenses to these cases. Our Company’s management expects that the ultimate liability, if any, with respect to such extra-contractual matters will not be material to our consolidated financial position. Nonetheless, given the large or indeterminate amounts sought in certain of these matters, and the inherent unpredictability of litigation, an adverse outcome in such matters could, from time to time, have a material adverse outcome on our consolidated results of operations or cash flows in a particular fiscal quarter or year.

Item 1A. Risk Factors

There have been no material changes from the risk factors as previously disclosed in our Company’s 2016 Annual Report on Form 10-K.

On March 29, 2017, the Prime Minister of the U.K. provided formal notification to the E.U. of the U.K’s intent to exit the E.U. The notification started the two-year process of negotiation between the U.K. and the E.U. to conclude the terms of the U.K’s exit. Please refer to the risk factor titled “The withdrawal of the U.K. from the E.U. could have a material adverse effect on our business, business opportunities, results of operations, financial condition and cash flows.” in our 2016 Annual Report on Form 10-K for additional information on the impact of such an event on our Company.

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

None

Item 3. Defaults Upon Senior Securities

None

Item 4. Mine Safety Disclosures

Not applicable

Item 5. Other Information

None

57

Item 6. Exhibits

Exhibit No.	Description of Exhibit
11-1	Computation of Per Share Earnings	*
31-1	Certification of CEO per Section 302 of the Sarbanes-Oxley Act	*
31-2	Certification of CFO per Section 302 of the Sarbanes-Oxley Act	*
32-1	Certification of CEO per Section 906 of the Sarbanes-Oxley Act (This exhibit is intended to be furnished in accordance with Regulation S-K item 601(b)(32)(ii) and shall not be deemed to be filed for purposes of section 18 of the Securities Exchange Act of 1934, as amended, or incorporated by reference into any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference).	*
32-2	Certification of CFO per Section 906 of the Sarbanes-Oxley Act (This exhibit is intended to be furnished in accordance with Regulation S-K item 601(b)(32)(ii) and shall not be deemed to be filed for purposes of section 18 of the Securities Exchange Act of 1934, as amended, or incorporated by reference into any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference).	*
101.INS	XBRL Instance Document	*
101.SCH	XBRL Taxonomy Extension Scheme	*
101.CAL	XBRL Taxonomy Extension Calculation Database	*
101.LAB	XBRL Taxonomy Extension Label Linkbase	*
101.PRE	XBRL Taxonomy Extension Presentation Linkbase	*
101.DEF	XBRL Taxonomy Extension Definition Linkbase	*

* Included herein

58

Signatures

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

	The Navigators Group, Inc.
	(Company)
Dated:  November 3, 2017	By:	/s/ Ciro M. DeFalco
		Ciro M. DeFalco
		Executive Vice President and Chief Financial Officer

59

EX-11.1

Exhibit 11-1

THE NAVIGATORS GROUP, INC. AND SUBSIDIARIES

Computation of Per Share Earnings

The following table presents the computation of Basic and Diluted Earnings (Loss) per Share for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,					Nine Months Ended September 30,
amounts in thousands, except per share amounts	2017			2016		2017		2016
Net Income (Loss)	$	(27,979	)	$	22,013	$	13,633	$	61,135
Basic Weighted Average Shares (1)		29,500			29,115		29,419		29,058
Effect of Common Stock Equivalents:
Assumed Exercise of Stock Options and Vesting of Stock Grants		—			1,026		587		939
Diluted Weighted Average Shares		29,500			30,141		30,006		29,997
Net Income (Loss) per Common Share:
Basic	$	(0.95	)	$	0.76	$	0.46	$	2.10
Diluted	$	(0.95	)	$	0.73	$	0.45	$	2.04
Anti-dilutive Shares Excluded from the Dilutive Computation		1,165			—		—		—

(1) - We completed a two-for-one stock split on January 20, 2017. All share and per share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

EX-31.1

Exhibit 31-1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PER

SECTION 302 OF THE SARBANES-OXLEY ACT

I, Stanley A. Galanski, certify that:

1. I have reviewed this report on Form 10-Q of The Navigators Group, Inc.;

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 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 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 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: November 3, 2017	/s/ Stanley A. Galanski
	Name:	Stanley A. Galanski
	Title:	President and Chief Executive Officer
		(Principal Executive Officer)

EX-31.2

Exhibit 31-2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PER

SECTION 302 OF THE SARBANES-OXLEY ACT

I, Ciro M. DeFalco, certify that:

1. I have reviewed this report on Form 10-Q of The Navigators Group, Inc.;

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 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 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 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: November 3, 2017	/s/ Ciro M. DeFalco
	Name:	Ciro M. DeFalco
	Title:	Executive Vice President and Chief Financial Officer
		(Principal Financial Officer)

EX-32.1

Exhibit 32-1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of The Navigators Group, Inc. (the “Company”) on Form 10-Q for the period ending September 30, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Stanley A. Galanski, 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/ Stanley A. Galanski

Stanley A. Galanski

President and Chief Executive Officer

November 3, 2017

A signed original of this written statement required by Section 906 has been provided to The Navigators Group, Inc. and will be retained by The Navigators Group, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32-2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of The Navigators Group, Inc. (the “Company”) on Form 10-Q for the period ending September 30, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Ciro M. DeFalco, 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/ Ciro M. DeFalco

Ciro M. DeFalco

Executive Vice President and Chief Financial Officer

November 3, 2017

A signed original of this written statement required by Section 906 has been provided to The Navigators Group, Inc. and will be retained by The Navigators Group, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 27, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Trading Symbol	NAVG
Entity Registrant Name	NAVIGATORS GROUP INC
Entity Central Index Key	0000793547
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		29,503,221

XML

Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Investments:
Fixed Maturities, available-for-sale, at fair value (amortized cost: 2017: $2,752,102; 2016: $2,628,225)		$ 2,798,185	$ 2,635,882
Equity Securities, available-for-sale, at fair value (cost: 2017: $334,739; 2016: $327,911)		375,876	349,142
Other Invested Assets		1,751	1,960
Short-Term Investments, at fair value (amortized cost: 2017: $247,602; 2016: $143,451)		247,607	143,539
Total Investments		3,423,419	3,130,523
Cash		56,471	64,643
Premiums Receivable		361,272	306,686
Prepaid Reinsurance Premiums		231,174	213,377
Reinsurance Recoverable on Paid Losses		61,054	82,582
Reinsurance Recoverable on Unpaid Losses and Loss Adjustment Expenses		847,505	779,276
Deferred Policy Acquisition Costs		134,625	119,660
Accrued Investment Income		20,420	17,315
Goodwill and Other Intangible Assets		6,591	6,451
Current Income Tax Receivable, Net		48,186	20,556
Deferred Income Tax, Net		13,080	20,938
Other Assets		71,751	52,030
Total Assets		5,275,548	4,814,037
Liabilities:
Reserves for Losses and Loss Adjustment Expenses		2,558,134	2,289,727
Unearned Premiums		990,518	887,344
Reinsurance Balances Payable		129,306	108,980
Senior Notes		263,845	263,728
Payable for Investments Purchased		21,862	0
Accounts Payable and Other Liabilities		87,692	86,070
Total Liabilities		4,051,357	3,635,849
Stockholders' Equity:
Preferred Stock ($.10 par value per share, authorized 1,000 shares, none issued)	[1]	0	0
Common Stock ($.10 par value per share, authorized 50,000 shares, issued 36,526 shares for 2017 and 36,147 shares for 2016)	[1]	3,650	3,612
Additional Paid-In Capital	[1]	371,512	373,983
Treasury Stock, at cost (7,023 shares for 2017 and 2016)	[1]	(155,801)	(155,801)
Retained Earnings	[1]	956,290	947,519
Accumulated Other Comprehensive Income	[1]	48,540	8,875
Total Stockholders' Equity	[1]	1,224,191	1,178,188
Total Liabilities and Stockholders' Equity		$ 5,275,548	$ 4,814,037

[1] We completed a two-for-one stock split on January 20, 2017. All share and per share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

XML

Consolidated Balance Sheets (Parenthetical) $ in Thousands	Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Statement Of Financial Position [Abstract]
Fixed Maturities, available-for-sale, amortized cost | $	$ 2,752,102	$ 2,628,225
Equity Securities, available-for-sale, cost | $	334,739	327,911
Short-Term Investments, amortized cost | $	$ 247,602	$ 143,451
Preferred Stock, par value | $ / shares	$ 0.10	$ 0.10
Preferred Stock, authorized shares	1,000,000	1,000,000
Preferred Stock, issued shares	0	0
Common Stock, par value | $ / shares	$ 0.10	$ 0.10
Common Stock, authorized shares	50,000,000	50,000,000
Common Stock, issued shares	36,526,000	36,147,000
Treasury Stock, shares	7,023,000	7,023,000

XML

Consolidated Statements of Income (Loss) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Gross Written Premiums		$ 402,038	$ 374,930	$ 1,304,522	$ 1,201,372
Revenues:
Net Written Premiums		296,016	277,001	966,461	903,356
Change in Unearned Premiums		5,339	7,009	(85,140)	(86,996)
Net Earned Premiums		301,355	284,010	881,321	816,360
Net Investment Income		22,598	19,875	66,311	59,344
Total Other-Than-Temporary Impairment Losses		(957)	23	(2,005)	(248)
Portion of Loss Recognized in Other Comprehensive Income (Before Tax)		(15)	(23)	(60)	98
Net Other-Than-Temporary Impairment Losses Recognized in Earnings		(972)	0	(2,065)	(150)
Net Realized Gains		5,190	1,586	7,933	5,143
Other Income (Loss)		(1,699)	(183)	(1,042)	6,796
Total Revenues		326,472	305,288	952,458	887,493
Expenses:
Net Losses and Loss Adjustment Expenses		276,171	172,793	622,881	492,955
Commission Expenses		45,509	42,611	141,526	120,891
Other Operating Expenses		45,773	56,137	165,077	176,020
Interest Expense		3,862	3,859	11,584	11,575
Total Expenses		371,315	275,400	941,068	801,441
Income (Loss) Before Income Taxes		(44,843)	29,888	11,390	86,052
Income Tax Expense (Benefit)		(16,864)	7,875	(2,243)	24,917
Net Income (Loss)		$ (27,979)	$ 22,013	$ 13,633	$ 61,135
Net Income (Loss) per Common Share:
Basic	[1]	$ (0.95)	$ 0.76	$ 0.46	$ 2.10
Diluted	[1]	$ (0.95)	$ 0.73	$ 0.45	$ 2.04
Average common shares outstanding:
Basic	[1]	29,500	29,115	29,419	29,058
Diluted	[1]	29,500	30,141	30,006	29,997
Cash Dividends Declared per Common Share		$ 0.06	$ 0.045	$ 0.165	$ 0.09

[1] We completed a two-for-one stock split on January 20, 2017. All share and per share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

XML

Consolidated Statements of Income (Loss) (Parenthetical)		9 Months Ended
	Jan. 20, 2017	Sep. 30, 2017
Income Statement [Abstract]
Stock split ratio	2
Stockholders equity, stock split		We completed a two-for-one stock split on January 20, 2017.

XML

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net Income (Loss)	$ (27,979)	$ 22,013	$ 13,633	$ 61,135
Change in Net Unrealized Gains (Losses) on Investments:
Unrealized Gains (Losses) on Investments arising during the period, net of Deferred Tax	9,653	(2,414)	36,928	43,362
Reclassification adjustment for Net Realized Gains included in Net Income net of Deferred Tax	(1,636)	(519)	134	1,449
Change in Net Unrealized Gains (Losses) on Investments	8,017	(2,933)	37,062	44,811
Change in Other-Than-Temporary Impairments
Non Credit Other-Than-Temporary Impairments arising during the period, net of Deferred Tax	9	15	39	(64)
Reclassification Adjustment for Other-Than-Temporary Impairment Credit Losses Recognized in Net Income net of Deferred Tax	358	0	761	0
Change in Other-Than-Temporary Impairments	367	15	800	(64)
Change in Foreign Currency Translation Gains (Losses), net of Deferred Tax	1,284	(335)	1,803	(6,174)
Other Comprehensive Income (Loss)	9,668	(3,253)	39,665	38,573
Comprehensive Income (Loss)	$ (18,311)	$ 18,760	$ 53,298	$ 99,708

XML

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Unrealized Gains on Investments arising during the period, Deferred Tax	$ (5,197)	$ 1,300	$ (19,884)	$ (23,349)
Reclassification adjustment for Net Realized (Gains) Losses included in Net Income, Deferred Tax	881	279	(72)	(780)
Non Credit Other-Than-Temporary Impairments arising during the period, Deferred Tax	(6)	(8)	(21)	34
Reclassification Adjustment for Other-Than-Temporary Impairment Credit Losses Recognized in Net Income, Deferred Tax	(193)	0	(410)	0
Change in Foreign Currency Translation Gains (Losses), Deferred Tax	$ (691)	$ 175	$ (971)	$ 3,322

XML

Consolidated Statement of Stockholders' Equity - 9 months ended Sep. 30, 2017 - USD ($) shares in Thousands, $ in Thousands		Total		Common Stock		Additional Paid-in Capital	Treasury Stock		Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2016		$ 1,178,188	[1]	$ 3,612		$ 373,983	$ (155,801)		$ 947,519	$ 8,875
Beginning balance (in shares) at Dec. 31, 2016		36,147		36,147	[2]		7,023	[2]
Net Income		$ 13,633							13,633
Dividends Declared		(4,862)							(4,862)
Changes in Comprehensive Income:
Change in Net Unrealized Gain on Investments		37,062								37,062
Change in Net Non-Credit Other-Than- Temporary Impairment Losses		800								800
Change in Foreign Currency Translation Gain		1,803								1,803
Total Comprehensive Income		39,665								39,665
Shares Issued	[3]	(10,793)		$ 38		(10,831)
Shares issued (in shares)	[2],[3]			379
Share-Based Compensation		8,360				8,360
Ending balance at Sep. 30, 2017		$ 1,224,191	[1]	$ 3,650		$ 371,512	$ (155,801)		$ 956,290	$ 48,540
Ending balance (in shares) at Sep. 30, 2017		36,526		36,526	[2]		7,023	[2]

[1] We completed a two-for-one stock split on January 20, 2017. All share and per share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

[2] We completed a two-for-one stock split on January 20, 2017. All share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

[3] Includes shares issued under the Second Amended and Restated 2005 Stock Incentive Plan to Directors and the Employee Stock Purchase Plan.

XML

Consolidated Statement of Stockholders' Equity (Parenthetical)		9 Months Ended
	Jan. 20, 2017	Sep. 30, 2017
Statement Of Stockholders Equity [Abstract]
Stock split ratio	2
Stockholders equity, stock split		We completed a two-for-one stock split on January 20, 2017.

XML

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities:
Net Income	$ 13,633	$ 61,135
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation & Amortization	3,586	4,214
Share-Based Compensation	8,360	13,929
Deferred Income Taxes	(13,920)	(7,066)
Net Realized Gains	(7,933)	(5,143)
Net Other-Than-Temporary Impairments Recognized in Earnings	2,065	150
Non-Cash Foreign Exchange (Gains) Losses	441	(6,972)
Changes in Assets And Liabilities:
Reinsurance Recoverable on Paid and Unpaid Losses and Loss Adjustment Expenses	(40,786)	(7,580)
Reserves for Losses and Loss Adjustment Expenses	251,971	78,577
Prepaid Reinsurance Premiums	(17,797)	9,697
Unearned Premiums	103,174	77,299
Premiums Receivable	(48,985)	(49,771)
Deferred Policy Acquisition Costs	(14,965)	(24,312)
Accrued Investment Income	(3,105)	(839)
Reinsurance Balances Payable	19,058	18,846
Current Income Tax Receivable, Net	(25,073)	6,389
Other	(6,973)	22,747
Net Cash Provided by Operating Activities	222,751	191,300
Fixed Maturities
Redemptions and Maturities	233,384	207,620
Sales	192,417	370,501
Purchases	(560,018)	(776,086)
Equity Securities
Sales	59,673	36,918
Purchases	(61,562)	(58,405)
Change in Net Payable for Securities	21,761	41,265
Purchase of Other Invested Assets	0	(2,021)
Net Change in Short-Term Investments	(100,406)	84,822
Purchase of Property and Equipment	(2,649)	(3,571)
Net Cash Used in Investing Activities	(217,400)	(98,957)
Financing Activities:
Proceeds of Stock Issued From Employee Stock Purchase Plan	2,289	1,840
Payment of Employee Tax Withholding on Stock Compensation	(13,835)	(5,081)
Dividends Paid	(4,862)	(2,619)
Net Cash Used in Financing Activities	(16,408)	(5,860)
Effect of Exchange Rate on Cash	2,885	(8,869)
Change in Cash	(8,172)	77,614
Cash at Beginning of Year	64,643	69,901
Cash at End of Period	56,471	147,515
Supplemental Information:
Income Taxes Paid, Net	39,877	24,148
Interest Paid	7,619	7,619
Issuance of Stock to Directors	$ 578	$ 633

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Organization and Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Organization and Summary of Significant Accounting Policies

NOTE 1.  ORGANIZATION & SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Unless the context requires otherwise, the terms “we,” “us,” “our” or “our Company” are used to mean The Navigators Group, Inc., a Delaware holding company established in 1982, and its subsidiaries. The term “Parent Company” is used to mean The Navigators Group, Inc. without its subsidiaries.

Organization

We are an international insurance company with a long-standing area of specialization in Marine insurance. We also offer Property and Casualty (“P&C”) insurance, primarily general liability coverage and umbrella & excess liability coverage to commercial enterprises through our Primary and Excess Casualty divisions. We have also developed niches in Professional Liability insurance, through our Directors & Officers (“D&O”) and Errors & Omissions (“E&O”) divisions, as well as assumed reinsurance products.

We operate through various wholly-owned insurance and service companies. Our subsidiaries domiciled in the United States (“U.S.”) include two insurance companies, Navigators Insurance Company (“NIC”) and Navigators Specialty Insurance Company (“NSIC”), as well as our U.S. underwriting agency, Navigators Management Company (“NMC”). NIC includes a branch in the United Kingdom (“U.K”). We also have operations domiciled in the U.K., Hong Kong and Europe. Navigators International Insurance Company Ltd. (“NIIC”), Navigators Management (U.K.) Ltd. (“NMUK”) and Navigators Underwriting Ltd. (“NUL”) are domiciled in the U.K. and NUL includes European branches. Navigators Underwriting Agency Ltd. (“NUAL”), a Lloyd’s of London (“Lloyd’s”) underwriting agency, manages and provides the capital, through Navigators Corporate Underwriters Ltd. (“NCUL”), for our Lloyd’s Syndicate 1221 (the “Syndicate”), and is also domiciled in the U.K. We control 100% of the Syndicate’s stamp capacity.

Effective January 1, 2017, we sold our underwriting agency operations in Sweden and Denmark. The transaction represented a 100% disposition of our Sweden and Denmark corporations, NUAL AB and Navigators A/S, respectively. This transaction did not have a material impact on our financial statements.

Basis of Presentation

The Consolidated Balance Sheet at September 30, 2017 and the Consolidated Statements of Income (Loss), Comprehensive Income (Loss), Stockholders’ Equity and Cash Flows for the periods ended September 30, 2017 and 2016 are unaudited. The Balance Sheet at December 31, 2016 is derived from our audited Financial Statements. The accompanying Interim Consolidated Financial Statements reflect all adjustments, which, in the opinion of management, are necessary to fairly present the results of our Company for the interim periods presented on the basis of U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X as promulgated by the U.S. Securities and Exchange Commission. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. All significant intercompany transactions and balances have been eliminated in consolidation. The preparation of these Financial Statements 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 reported revenues and expenses during the reporting periods. The results of operations for any interim period are not necessarily indicative of results for the full year. The Interim Consolidated Financial Statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2016. Certain amounts for the prior period have been reclassified to conform with the current period presentation.

Income Taxes

The interim income tax provision has been computed based on our estimated annual Effective Tax Rate, which represents our best estimate on a year to date basis for the interim period. As a result, the tax provision for a given quarter equals the difference between the provision recorded cumulatively year to date less the amount recorded cumulatively as of the end of the prior interim period. Our Effective Tax Rate for the quarter and year to date differs from the federal tax rate of 35% primarily due to an excess tax benefit related to the vesting of stock compensation at fair market value, tax-exempt investment income and dividends received deduction.

Starting in the first quarter of 2017, excess tax benefits related to the vesting of stock compensation were recognized as a reduction to Income Tax Expense rather than as an increase to Additional Paid-In Capital as a result of the adoption of the Accounting Standards Update (“ASU”) 2016-09 (see section New Accounting Standards Adopted in 2017 of this footnote for further information on the adoption of this standard).

Significant Accounting Policies

There were no changes in our significant accounting policies subsequent to our Annual Report on Form 10-K for the year ended December 31, 2016.

New Accounting Standards Adopted in 2017

Share-Based Compensation Accounting

Effective January 1, 2017, our Company adopted ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting” issued by the Financial Accounting Standards Board (the “FASB”). This guidance requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled, eliminates the requirement that excess tax benefits be realized before companies can recognize them, requires the presentation of excess tax benefits as an operating activity on the statement of cash flows, allows employers to increase the amounts withheld to cover income taxes on share-based compensation awards without requiring liability classification, requires the presentation of employee taxes paid as a financing activity on the statement of cash flows, and requires companies to elect whether they will account for award forfeitures by recognizing forfeitures only as they occur or by estimating the number of awards expected to be forfeited.

The requirement to recognize all income tax effects of awards in the income statement when the awards vest or are settled was adopted on a prospective basis. Previously, these amounts were recorded in Additional Paid-In Capital. This change also prospectively impacts the calculation of potential common shares used to determine Diluted Net Income per Common Share under the treasury stock method. The new standard requires that assumed proceeds under the treasury stock method be modified to exclude the amount of excess tax benefits that previously would have been recognized in Additional Paid-In Capital.

We elected to account for forfeitures of share-based payment awards by recognizing forfeitures of awards as they occur, and upon adoption of this guidance, the payment of employee taxes was retrospectively adjusted on the Consolidated Statements of Cash Flows to be classified as a financing activity. All other changes in the ASU did not result in cumulative-effect or retrospective adjustments. The adoption of this guidance did not materially impact our results of operations, financial condition or liquidity.

Transition to Equity Method of Accounting

Effective January 1, 2017, our Company adopted the ASU 2016-07, “Simplifying the Transition to the Equity Method of Accounting” issued by the FASB. This guidance eliminates the requirement to retrospectively apply equity method accounting when an investment that had been accounted for by another method initially qualifies for the equity method. Our Company did not have any investments transitioning to the equity method of accounting during the nine months ended September 30, 2017. The adoption of this guidance did not impact our results of operations, financial condition or liquidity.

Share-Based Compensation Modification Accounting

During the second quarter of 2017, our Company early adopted the ASU 2017-09, “Scope of Modification Accounting” issued by the FASB. This guidance clarifies when changes to the terms or conditions of a share-based award must be accounted for as modifications. Under the new guidance, modification accounting is required if the value, vesting conditions or classification of the award changes. This guidance will be applied prospectively to awards modified on or after the adoption date. The adoption of this guidance did not impact our results of operations, financial condition or liquidity.

Recently Issued Accounting Standards Not Yet Adopted

Definition of a Business

In January 2017, the FASB issued ASU 2017-01, “Clarifying the Definition of a Business” with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This guidance is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years with early adoption permitted. This guidance will be applied prospectively to any transactions occurring within the period of adoption.

Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment” that eliminates the requirement to calculate the implied fair value of goodwill (i.e., Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, an impairment charge will be based on the excess of a reporting unit’s carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current goodwill impairment test). This guidance is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019, with early adoption permitted for annual and interim goodwill impairment testing dates after January 1, 2017. This guidance will be adopted on a prospective basis.

Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, “Premium Amortization on Purchased Callable Debt Securities” that shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. This guidance is effective for annual periods beginning after December 15, 2018, and interim periods within those fiscal years with early adoption permitted. This guidance will be adopted using a modified retrospective transition approach. The adoption of this guidance is not expected to materially impact our results of operations, financial condition or liquidity.

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Segment Information

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Segment Information

NOTE 2.  SEGMENT INFORMATION

We report our results of operations consistent with the manner in which our Chief Operating Decision Maker reviews the business to assess performance through our reporting segments: U.S. Insurance, International Insurance (“Int’l Insurance”), Global Reinsurance (“GlobalRe”) and Corporate. 

We classify our business into three underwriting segments: U.S. Insurance, Int’l Insurance and GlobalRe.  Both the U.S. Insurance and Int’l Insurance reporting segments are each comprised of three operating segments: Marine, P&C and Professional Liability.

We evaluate the performance of each of the underwriting segments based on underwriting results.  Underwriting results are measured based on Underwriting Profit or Loss and the related Combined Ratio, which are both measures of underwriting profitability.   Underwriting Profit (Loss) is calculated from Net Earned Premiums less the sum of Net Losses and Loss Adjustment Expenses (“LAE”), Commission Expenses, Other Operating Expenses and Other Underwriting Income (Expense).  The Combined Ratio is derived by dividing the sum of Net Losses and LAE, Commission Expenses, Other Operating Expenses and Other Underwriting Income (Expense) by Net Earned Premiums.  A Combined Ratio of less than 100% indicates an Underwriting Profit and greater than 100% indicates an Underwriting Loss.  Our underwriting performance is evaluated separately from the rest of our operations.  

The performance of our investment portfolios, our liquidity and capital resource needs, our foreign currency exposure and our tax planning strategies are evaluated on a consolidated basis within our Corporate segment. We do not allocate our assets by underwriting segment as we evaluate the underwriting results of these segments separately from the results of our investments portfolio.

Financial data by segment for the three and nine months ended September 30, 2017 and 2016 was as follows:

	Three Months Ended September 30, 2017
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	169,150		$	84,407		$	47,798		$	—		$	301,355
Net Losses and LAE		(135,340	)		(81,713	)		(59,118	)		—			(276,171	)
Commission Expenses		(18,286	)		(16,201	)		(11,233	)		211			(45,509	)
Other Operating Expenses		(25,375	)		(16,388	)		(4,010	)		—			(45,773	)
Other Underwriting Income (Expense)		125			—			94			(211	)		8
Underwriting Loss	$	(9,726	)	$	(29,895	)	$	(26,469	)	$	—		$	(66,090	)
Net Investment Income											22,598			22,598
Net Realized Gains											4,218			4,218
Interest Expense											(3,862	)		(3,862	)
Other Loss											(1,707	)		(1,707	)
Loss Before Income Taxes	$	(9,726	)	$	(29,895	)	$	(26,469	)	$	21,247		$	(44,843	)
Income Tax Benefit											16,864			16,864
Net Loss													$	(27,979	)
Losses and LAE Ratio		80.0	%		96.8	%		123.7	%					91.6	%
Commission Expense Ratio		10.8	%		19.2	%		23.5	%					15.1	%
Other Operating Expense Ratio (2)		14.9	%		19.4	%		8.2	%					15.2	%
Combined Ratio		105.7	%		135.4	%		155.4	%					121.9	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

	Three Months Ended September 30, 2016
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	161,722		$	79,761		$	42,527		$	—		$	284,010
Net Losses and LAE		(106,320	)		(45,043	)		(21,430	)		—			(172,793	)
Commission Expenses		(18,630	)		(15,348	)		(8,951	)		318			(42,611	)
Other Operating Expenses		(31,517	)		(20,183	)		(4,437	)		—			(56,137	)
Other Underwriting Income (Expense)		240			—			122			(318	)		44
Underwriting Profit (Loss)	$	5,495		$	(813	)	$	7,831		$	—		$	12,513
Net Investment Income											19,875			19,875
Net Realized Gains											1,586			1,586
Interest Expense											(3,859	)		(3,859	)
Other Loss											(227	)		(227	)
Income (Loss) Before Income Taxes	$	5,495		$	(813	)	$	7,831		$	17,375		$	29,888
Income Tax Expense											(7,875	)		(7,875	)
Net Income													$	22,013
Losses and LAE Ratio		65.7	%		56.5	%		50.4	%					60.8	%
Commission Expense Ratio		11.5	%		19.2	%		21.0	%					15.0	%
Other Operating Expense Ratio (2)		19.4	%		25.3	%		10.2	%					19.8	%
Combined Ratio		96.6	%		101.0	%		81.6	%					95.6	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

	Nine Months Ended September 30, 2017
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	500,241		$	250,593		$	130,487		$	—		$	881,321
Net Losses and LAE		(339,436	)		(176,513	)		(106,932	)		—			(622,881	)
Commission Expenses		(59,130	)		(54,435	)		(28,695	)		734			(141,526	)
Other Operating Expenses		(91,987	)		(58,687	)		(14,403	)		—			(165,077	)
Other Underwriting Income (Expense)		335			—			439			(734	)		40
Underwriting Profit (Loss)	$	10,023		$	(39,042	)	$	(19,104	)	$	—		$	(48,123	)
Net Investment Income											66,311			66,311
Net Realized Gains											5,868			5,868
Interest Expense											(11,584	)		(11,584	)
Other Loss											(1,082	)		(1,082	)
Income (Loss) Before Income Taxes	$	10,023		$	(39,042	)	$	(19,104	)	$	59,513		$	11,390
Income Tax Benefit											2,243			2,243
Net Income													$	13,633
Losses and LAE Ratio		67.9	%		70.4	%		81.9	%					70.7	%
Commission Expense Ratio		11.8	%		21.7	%		22.0	%					16.1	%
Other Operating Expense Ratio (2)		18.3	%		23.5	%		10.7	%					18.7	%
Combined Ratio		98.0	%		115.6	%		114.6	%					105.5	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

	Nine Months Ended September 30, 2016
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate(1)			Total
Net Earned Premiums	$	462,446		$	235,602		$	118,312		$	—		$	816,360
Net Losses and LAE		(291,260	)		(133,519	)		(68,176	)		—			(492,955	)
Commission Expenses		(50,379	)		(47,524	)		(24,188	)		1,200			(120,891	)
Other Operating Expenses		(96,848	)		(64,997	)		(14,175	)		—			(176,020	)
Other Underwriting Income (Expense)		943			—			374			(1,200	)		117
Underwriting Profit (Loss)	$	24,902		$	(10,438	)	$	12,147		$	—		$	26,611
Net Investment Income											59,344			59,344
Net Realized Gains											4,993			4,993
Interest Expense											(11,575	)		(11,575	)
Other Income											6,679			6,679
Income (Loss) Before Income Taxes	$	24,902		$	(10,438	)	$	12,147		$	59,441		$	86,052
Income Tax Expense											(24,917	)		(24,917	)
Net Income													$	61,135
Losses and LAE Ratio		63.0	%		56.7	%		57.6	%					60.4	%
Commission Expense Ratio		10.9	%		20.2	%		20.4	%					14.8	%
Other Operating Expense Ratio (2)		20.7	%		27.5	%		11.7	%					21.5	%
Combined Ratio		94.6	%		104.4	%		89.7	%					96.7	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

Revenue by operating segment for the three and nine months ended September 30, 2017 and 2016 was as follows:

	Three Months Ended September 30, 2017									Three Months Ended September 30, 2016									% Change
amounts in thousands	Gross Written Premiums		Ceded Written Premiums			NetWritten Premiums		Net Earned Premiums		Gross Written Premiums		Ceded Written Premiums			Net Written Premiums		Net Earned Premiums		Gross Written Premiums			Ceded Written Premiums			NetWritten Premiums			Net Earned Premiums
U.S. Insurance
Marine	$	36,403	$	(18,859	)	$	17,544	$	20,129	$	40,271	$	(17,636	)	$	22,635	$	25,465		(9.6	%)		6.9	%		(22.5	%)		(21.0	%)
P&C		166,097		(39,952	)		126,145		125,931		161,600		(36,011	)		125,589		115,971		2.8	%		10.9	%		0.4	%		8.6	%
ProfessionalLiability		32,552		(5,517	)		27,035		23,090		32,776		(7,712	)		25,064		20,286		(0.7	%)		(28.5	%)		7.9	%		13.8	%
Total	$	235,052	$	(64,328	)	$	170,724	$	169,150	$	234,647	$	(61,359	)	$	173,288	$	161,722		0.2	%		4.8	%		(1.5	%)		4.6	%
Int'l Insurance
Marine	$	41,689	$	(9,948	)	$	31,741	$	39,038	$	38,453	$	(12,631	)	$	25,822	$	34,794		8.4	%		(21.2	%)		22.9	%		12.2	%
P&C		37,415		(19,772	)		17,643		21,775		38,077		(15,331	)		22,746		25,584		(1.7	%)		29.0	%		(22.4	%)		(14.9	%)
Professional Liability		34,497		(9,246	)		25,251		23,594		27,954		(7,232	)		20,722		19,383		23.4	%		27.8	%		21.9	%		21.7	%
Total	$	113,601	$	(38,966	)	$	74,635	$	84,407	$	104,484	$	(35,194	)	$	69,290	$	79,761		8.7	%		10.7	%		7.7	%		5.8	%
GlobalRe	$	53,385	$	(2,728	)	$	50,657	$	47,798	$	35,799	$	(1,376	)	$	34,423	$	42,527		49.1	%		98.3	%		47.2	%		12.4	%
Total	$	402,038	$	(106,022	)	$	296,016	$	301,355	$	374,930	$	(97,929	)	$	277,001	$	284,010		7.2	%		8.3	%		6.9	%		6.1	%

	Nine Months Ended September 30, 2017									Nine Months Ended September 30, 2016									% Change
amounts in thousands	Gross Written Premiums		Ceded Written Premiums			NetWritten Premiums		Net Earned Premiums		Gross Written Premiums		Ceded Written Premiums			NetWritten Premiums		Net Earned Premiums		Gross Written Premiums			Ceded Written Premiums			NetWritten Premiums			Net Earned Premiums
U.S. Insurance
Marine	$	119,040	$	(55,830	)	$	63,210	$	64,635	$	129,621	$	(53,823	)	$	75,798	$	73,636		(8.2	%)		3.7	%		(16.6	%)		(12.2	%)
P&C		524,223		(129,297	)		394,926		366,280		471,532		(103,286	)		368,246		335,342		11.2	%		25.2	%		7.2	%		9.2	%
ProfessionalLiability		86,580		(14,545	)		72,035		69,326		88,065		(21,365	)		66,700		53,468		(1.7	%)		(31.9	%)		8.0	%		29.7	%
Total	$	729,843	$	(199,672	)	$	530,171	$	500,241	$	689,218	$	(178,474	)	$	510,744	$	462,446		5.9	%		11.9	%		3.8	%		8.2	%
Int'l Insurance
Marine	$	160,119	$	(33,410	)	$	126,709	$	116,058	$	151,548	$	(33,274	)	$	118,274	$	109,746		5.7	%		0.4	%		7.1	%		5.8	%
P&C		124,446		(69,780	)		54,666		67,292		145,125		(57,025	)		88,100		70,608		(14.2	%)		22.4	%		(37.9	%)		(4.7	%)
ProfessionalLiability		102,089		(26,178	)		75,911		67,243		87,694		(21,776	)		65,918		55,248		16.4	%		20.2	%		15.2	%		21.7	%
Total	$	386,654	$	(129,368	)	$	257,286	$	250,593	$	384,367	$	(112,075	)	$	272,292	$	235,602		0.6	%		15.4	%		(5.5	%)		6.4	%
GlobalRe	$	188,025	$	(9,021	)	$	179,004	$	130,487	$	127,787	$	(7,467	)	$	120,320	$	118,312		47.1	%		20.8	%		48.8	%		10.3	%
Total	$	1,304,522	$	(338,061	)	$	966,461	$	881,321	$	1,201,372	$	(298,016	)	$	903,356	$	816,360		8.6	%		13.4	%		7.0	%		8.0	%

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Investments

9 Months Ended

Sep. 30, 2017

Investments Debt And Equity Securities [Abstract]

Investments

NOTE 3.  INVESTMENTS

The following tables set forth our Company’s available-for-sale investments as of September 30, 2017 and December 31, 2016 and include Other-Than-Temporary-Impairment (“OTTI”) securities recognized within Accumulated Other Comprehensive Income (“AOCI”):

	September 30, 2017
			Gross		Gross			Cost or
	Fair		Unrealized		Unrealized			Amortized
amounts in thousands	Value		Gains		(Losses)			Cost
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	269,851	$	8,169	$	(607	)	$	262,289
States, Municipalities and Political Subdivisions		684,792		20,643		(1,481	)		665,630
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		426,441		3,365		(4,298	)		427,374
Residential Mortgage Obligations		34,748		570		(27	)		34,205
Asset-Backed Securities		331,646		2,503		(426	)		329,569
Commercial Mortgage-Backed Securities		140,601		2,742		(1,308	)		139,167
Subtotal	$	933,436	$	9,180	$	(6,059	)	$	930,315
Corporate Exposures (1)		910,106		18,221		(1,983	)		893,868
Total Fixed Maturities	$	2,798,185	$	56,213	$	(10,130	)	$	2,752,102
Equity Securities:
Common Stocks	$	180,771	$	35,179	$	(815	)	$	146,407
Preferred Stocks		195,105		7,418		(645	)		188,332
Total Equity Securities	$	375,876	$	42,597	$	(1,460	)	$	334,739
Short-Term Investments		247,607		5		—			247,602
Total Investments	$	3,421,668	$	98,815	$	(11,590	)	$	3,334,443

(1) - Corporate Exposures consist of investments in corporate bonds, hybrid bonds and redeemable preferred stocks.

	December 31, 2016
			Gross		Gross			Cost or
	Fair		Unrealized		Unrealized			Amortized
amounts in thousands	Value		Gains		(Losses)			Cost
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	273,776	$	2,192	$	(5,128	)	$	276,712
States, Municipalities and Political Subdivisions		547,415		11,542		(4,036	)		539,909
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		487,364		4,016		(6,585	)		489,933
Residential Mortgage Obligations		20,530		453		(55	)		20,132
Asset-Backed Securities		314,601		824		(1,178	)		314,955
Commercial Mortgage-Backed Securities		154,139		2,859		(1,904	)		153,184
Subtotal	$	976,634	$	8,152	$	(9,722	)	$	978,204
Corporate Exposures (1)		838,057		10,185		(5,528	)		833,400
Total Fixed Maturities	$	2,635,882	$	32,071	$	(24,414	)	$	2,628,225
Equity Securities:
Common Stocks	$	164,087	$	24,677	$	(964	)	$	140,374
Preferred Stocks		185,055		2,339		(4,821	)		187,537
Total Equity Securities	$	349,142	$	27,016	$	(5,785	)	$	327,911
Short-Term Investments		143,539		88		—			143,451
Total Investments	$	3,128,563	$	59,175	$	(30,199	)	$	3,099,587

(1) - Corporate Exposures consist of investments in corporate bonds, hybrid bonds and redeemable preferred stocks.

During 2016, our Company made investments in certain companies, which are reported as Other Invested Assets on the Consolidated Balance Sheet and accounted for using the equity method.  In applying the equity method, these investments are initially recorded at cost and are subsequently adjusted based on our Company’s proportionate share of the net income or loss of the investments. Our initial purchase price for these investments was $2.0 million with a current carrying value of $1.8 million at September 30, 2017 as reflected on our Consolidated Balance Sheet.

As of September 30, 2017 and December 31, 2016, our Company did not have a concentration of greater than 5% of invested assets in a single non-government backed issuer.

As of September 30, 2017 and December 31, 2016, Fixed Maturities for which Non-Credit OTTI was previously recognized and included in AOCI were in a Net Unrealized Gain position of $0.5 million and $0.4 million, respectively.

The fair value of our Company’s investment portfolio may fluctuate significantly in response to various factors such as changes in interest rates, investment quality ratings, equity prices, foreign exchange rates and credit spreads. Our Company does not have the intent to sell nor is it more likely than not that it will have to sell Fixed Maturities in unrealized loss positions that are not other-than-temporarily impaired before recovery. For structured securities, default probability and severity assumptions differ based on property type, vintage and the stress of the collateral. Our Company does not intend to sell, and it is more likely than not that our Company will not be required to sell, these securities before the recovery of the amortized cost basis. For Equity Securities, our Company also considers our intent to hold securities as part of the process of evaluating whether a decline in fair value represents an other-than-temporary decline in value. Our Company may realize investment losses to the extent our liquidity needs require the disposition of Fixed Maturity securities in unfavorable interest rate, liquidity or credit spread environments. Significant changes in the factors our Company considers when evaluating investments for impairment losses could result in a significant change in impairment losses reported in the Consolidated Financial Statements.

The contractual maturity dates for Fixed Maturities categorized by the number of years until maturity as of September 30, 2017 are shown in the following table:

	September 30, 2017
	Fair		Amortized
amounts in thousands	Value		Cost
Due in one year or less	$	218,780	$	216,537
Due after one year through five years		708,302		697,520
Due after five years through ten years		333,260		324,180
Due after ten years		604,407		583,550
Mortgage-Backed and Asset-Backed Securities		933,436		930,315
Total	$	2,798,185	$	2,752,102

Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Prepayment assumptions associated with the Mortgage-Backed and Asset-Backed Securities are reviewed on a periodic basis. When changes in prepayment assumptions are deemed necessary as the result of actual prepayments differing from anticipated prepayments, securities are revalued based upon the new prepayment assumptions utilizing the retrospective accounting method. Due to the periodic repayment of principal, our Mortgage-Backed and Asset-Backed Securities are estimated to have an effective maturity of approximately 4.9 years.

The following tables summarize all securities in a gross unrealized loss position as of September 30, 2017 and December 31, 2016, showing the aggregate fair value and gross unrealized loss by the length of time those securities have continuously been in a gross unrealized loss position:

	September 30, 2017
	Less than 12 months					Greater than 12 months					Total
			Gross					Gross					Gross
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
amounts in thousands	Value		(Losses)			Value		(Losses)			Value		(Losses)
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	67,562	$	(344	)	$	31,928	$	(263	)	$	99,490	$	(607	)
States, Municipalities and Political Subdivisions		80,570		(732	)		31,125		(749	)		111,695		(1,481	)
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		237,804		(2,846	)		56,656		(1,452	)		294,460		(4,298	)
Residential Mortgage Obligations		7,899		(6	)		586		(21	)		8,485		(27	)
Asset-Backed Securities		69,885		(379	)		4,942		(47	)		74,827		(426	)
Commercial Mortgage-Backed Securities		41,572		(594	)		7,924		(714	)		49,496		(1,308	)
Subtotal	$	357,160	$	(3,825	)	$	70,108	$	(2,234	)	$	427,268	$	(6,059	)
Corporate Exposures		150,289		(915	)		93,463		(1,068	)		243,752		(1,983	)
Total Fixed Maturities	$	655,581	$	(5,816	)	$	226,624	$	(4,314	)	$	882,205	$	(10,130	)
Equity Securities:
Common Stocks	$	15,633	$	(814	)	$	87	$	(1	)	$	15,720	$	(815	)
Preferred Stocks		31,775		(614	)		667		(31	)		32,442		(645	)
Total Equity Securities	$	47,408	$	(1,428	)	$	754	$	(32	)	$	48,162	$	(1,460	)
Total Fixed Maturities and Equity Securities	$	702,989	$	(7,244	)	$	227,378	$	(4,346	)	$	930,367	$	(11,590	)

	December 31, 2016
	Less than 12 months					Greater than 12 months					Total
			Gross					Gross					Gross
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
amounts in thousands	Value		(Losses)			Value		(Losses)			Value		(Losses)
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	150,891	$	(2,570	)	$	16,819	$	(2,558	)	$	167,710	$	(5,128	)
States, Municipalities and Political Subdivisions		137,731		(3,111	)		13,255		(925	)		150,986		(4,036	)
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		349,119		(6,155	)		12,401		(430	)		361,520		(6,585	)
Residential Mortgage Obligations		953		(18	)		926		(37	)		1,879		(55	)
Asset-Backed Securities		95,514		(970	)		48,093		(208	)		143,607		(1,178	)
Commercial Mortgage-Backed Securities		51,932		(1,164	)		7,910		(740	)		59,842		(1,904	)
Subtotal	$	497,518	$	(8,307	)	$	69,330	$	(1,415	)	$	566,848	$	(9,722	)
Corporate Exposures		325,733		(5,086	)		26,005		(442	)		351,738		(5,528	)
Total Fixed Maturities	$	1,111,873	$	(19,074	)	$	125,409	$	(5,340	)	$	1,237,282	$	(24,414	)
Equity Securities:
Common Stocks	$	31,272	$	(634	)	$	1,471	$	(330	)	$	32,743	$	(964	)
Preferred Stocks		113,742		(4,785	)		523		(36	)		114,265		(4,821	)
Total Equity Securities	$	145,014	$	(5,419	)	$	1,994	$	(366	)	$	147,008	$	(5,785	)
Total Fixed Maturities and Equity Securities	$	1,256,887	$	(24,493	)	$	127,403	$	(5,706	)	$	1,384,290	$	(30,199	)

Our Company analyzes impaired securities quarterly to determine if any impairments are other-than-temporary.  The above securities with unrealized losses are deemed to be temporarily impaired based on our evaluation.  

As of September 30, 2017, there were 317 Fixed Maturities and 35 Equity Securities in an unrealized loss position. As of December 31, 2016, there were 413 Fixed Maturities and 75 Equity Securities in an unrealized loss position. As of September 30, 2017, the gross unrealized loss for the greater than 12 months category consists primarily of Agency Mortgage-Backed Securities and Corporate Exposures principally due to an increase in interest rates since the time of purchase. As of December 31, 2016, the gross unrealized loss for the greater than 12 months category consists primarily of Agency and Foreign Government Bonds principally due to unfavorable foreign exchange movement.  The gross unrealized loss for the less than 12 months category for the period ended September 30, 2017 consists primarily of Agency Mortgage-Backed Securities due to an increase in interest rates since the time of purchase.  The gross unrealized loss for the less than 12 months category for the period ended December 31, 2016 consists primarily of Agency Mortgage-Backed Securities, Corporate Exposures and Preferred Stocks, which are reported as Equity Securities, due to an increase in interest rates since the time of purchase.

As of September 30, 2017 and December 31, 2016, the largest unrealized loss by a non-government backed issuer in the investment portfolio was $0.8 million and $1.0 million, respectively.

Our Company’s ability to hold securities is supported by sufficient cash flow from our operations and from maturities within our investment portfolio in order to meet our claims payments and other disbursement obligations arising from our underwriting operations without selling such investments.  With respect to securities where the decline in value is determined to be temporary and the security’s value is not written down, a subsequent decision may be made to sell that security and realize a loss.  Subsequent decisions on security sales are made within the context of overall risk monitoring, changing information and market conditions.  

Our Company had two credit related OTTI losses of $1.0 million in the equity portfolio during the three months ended September 30, 2017. Our Company had four credit related OTTI losses of $2.1 million in the equity portfolio during the nine months ended September 30, 2017. Our Company had no credit related OTTI losses during the three months ended September 30, 2016 and one credit related OTTI loss of $0.2 million in the Fixed Maturities portfolio during the nine months ended September 30, 2016.

The following table summarizes the cumulative amounts related to our Company’s credit loss portion of the OTTI losses on Fixed Maturities for the three and nine months ended September 30, 2017 and 2016

	Three Months Ended September 30,					Nine Months Ended September 30,
amounts in thousands	2017		2016			2017		2016
Beginning Balance	$	2,361	$	2,511		$	2,361	$	2,361
Additions for Credit Loss Impairments recognized in the    current period on securities not previously impaired		—		—			—		150
Additions for Credit Loss Impairments recognized in the    current period on securities previously impaired		—		—			—		—
Reductions for Credit Loss Impairments previously    recognized  on securities sold during the period		—		(150	)		—		(150	)
Ending Balance	$	2,361	$	2,361		$	2,361	$	2,361

Our Company’s Net Investment Income was derived from the following sources:

	Three Months Ended September 30,						Nine Months Ended September 30,
amounts in thousands	2017			2016			2017			2016
Fixed Maturities	$	19,491		$	17,124		$	57,019		$	50,781
Equity Securities		3,774			3,540			11,337			10,418
Short-Term Investments		250			70			662			568
Total Investment Income	$	23,515		$	20,734		$	69,018		$	61,767
Investment Expenses		(917	)		(859	)		(2,707	)		(2,423	)
Net Investment Income	$	22,598		$	19,875		$	66,311		$	59,344

Realized Gains and Losses, excluding net OTTI losses recognized in earnings, for the periods indicated, were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
amounts in thousands	2017			2016			2017			2016
Fixed Maturities:
Gains	$	2,589		$	1,356		$	3,401		$	5,200
Losses		(900	)		(1,221	)		(3,114	)		(3,086	)
Fixed Maturities, Net	$	1,689		$	135		$	287		$	2,114
Short-Term:
Gains	$	767		$	128		$	1,014		$	803
Losses		(111	)		(107	)		(371	)		(250	)
Short-Term, Net	$	656		$	21		$	643		$	553
Equity Securities:
Gains	$	2,863		$	1,443		$	7,249		$	3,123
Losses		(18	)		(13	)		(246	)		(647	)
Equity Securities, Net	$	2,845		$	1,430		$	7,003		$	2,476
Net Realized Gains	$	5,190		$	1,586		$	7,933		$	5,143

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Fair Value Measurement

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurement

NOTE 4.  FAIR VALUE MEASUREMENT

The fair value of our financial instruments is determined based on the following fair value hierarchy:

Level 1 – Quoted prices for identical instruments in active markets.  Examples are listed Common Stocks and fixed income securities traded on an exchange.  U.S. Treasury securities are reported as Level 1 and are valued based on unadjusted quoted prices for identical assets in active markets that our Company can access.

Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets.  Examples are Asset-Backed and Mortgage-Backed Securities that are similar to other Asset-Backed or Mortgage-Backed Securities observed in the market. U.S. Government Agency Securities are reported as Level 2 and are valued using yields and spreads that are observable in active markets.

Level 3 – Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.  An example would be a private placement with minimal liquidity.

The following tables present, for each of the fair value hierarchy levels as defined by the accounting guidance for fair value measurements described above, our Company’s Fixed Maturities and Equity Securities by asset class that are measured at fair value on a recurring basis, as well as the fair value of the 5.75% Senior Notes due October 15, 2023 (the “Senior Notes”) carried at amortized cost as of September 30, 2017 and December 31, 2016:

	September 30, 2017
amounts in thousands	Level 1		Level 2		Level 3		Total
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	51,612	$	218,239	$	—	$	269,851
States, Municipalities and Political Subdivisions		—		684,792		—		684,792
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		—		426,441		—		426,441
Residential Mortgage Obligations		—		34,748		—		34,748
Asset-Backed Securities		—		331,646		—		331,646
Commercial Mortgage-Backed Securities		—		140,601		—		140,601
Subtotal	$	—	$	933,436	$	—	$	933,436
Corporate Exposures		—		910,106		—		910,106
Total Fixed Maturities	$	51,612	$	2,746,573	$	—	$	2,798,185
Equity Securities:
Common Stocks	$	180,771	$	—	$	—	$	180,771
Preferred Stocks		—		195,105		—		195,105
Total Equity Securities	$	180,771	$	195,105	$	—	$	375,876
Short-Term Investments		247,607		—		—		247,607
Total Assets Measured at Fair Value	$	479,990	$	2,941,678	$	—	$	3,421,668
Senior Notes	$	—	$	282,073	$	—	$	282,073
Total Liabilities Measured at Fair Value	$	—	$	282,073	$	—	$	282,073

	December 31, 2016
amounts in thousands	Level 1		Level 2		Level 3		Total
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	47,704	$	226,072	$	—	$	273,776
States, Municipalities and Political Subdivisions		—		547,415		—		547,415
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		—		487,364		—		487,364
Residential Mortgage Obligations		—		20,530		—		20,530
Asset-Backed Securities		—		314,601		—		314,601
Commercial Mortgage-Backed Securities		—		154,139		—		154,139
Subtotal	$	—	$	976,634	$	—	$	976,634
Corporate Exposures		—		838,057		—		838,057
Total Fixed Maturities	$	47,704	$	2,588,178	$	—	$	2,635,882
Equity Securities:
Common Stocks	$	164,087	$	—	$	—	$	164,087
Preferred Stocks		—		185,055		—		185,055
Total Equity Securities	$	164,087	$	185,055	$	—	$	349,142
Short-Term Investments		143,539		—		—		143,539
Total Assets Measured at Fair Value	$	355,330	$	2,773,233	$	—	$	3,128,563
Senior Notes	$	—	$	280,316	$	—	$	280,316
Total Liabilities Measured at Fair Value	$	—	$	280,316	$	—	$	280,316

All other financial assets and liabilities including Cash, Premium Receivable, Reinsurance Recoverable and Reinsurance Balances Payable are carried at cost, which approximates fair value.

Our Company did not have any significant transfers between Level 1 and Level 2 classifications for the three and nine months ended September 30, 2017 and 2016.

As of September 30, 2017, our Company did not have any Level 3 assets.

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Loss Reserves

9 Months Ended

Sep. 30, 2017

Insurance [Abstract]

Loss Reserves

NOTE 5.  LOSS RESERVES

We establish reserves for the estimated unpaid ultimate liability for losses and LAE under the terms of our policies and agreements.  The determination of Reserves for Losses and LAE is partially dependent upon the receipt of information from agents and brokers.  Reserves include estimates for both claims that have been reported and for those that have been incurred but not reported (“IBNR”), and include estimates of expenses associated with processing and settling these claims.  Reserves are recorded in Reserves for Losses and LAE in the Consolidated Balance Sheets.  Our estimates and judgements may be revised as additional experience and other data become available and are reviewed, as new or improved methodologies are developed, or as laws change. Frequency/severity analyses are also performed for certain books of business.  To the extent that reserves are found deficient or redundant, a strengthening or release is recognized as a charge or credit to earnings.

The following table summarizes our Company’s Reserves for Losses and LAE activity for the nine months ended September 30, 2017 and 2016:

	For the Nine Months Ended September 30,
amounts in thousands	2017			2016
Net Reserves for Losses and LAE at Beginning of Year	$	1,510,451		$	1,393,126
Provision for Losses and LAE for Claims Occurring in the Current Year		578,272			504,599
Increase (Decrease) in Estimated Losses and LAE for Claims Occurring in Prior Years		44,609			(11,644	)
Incurred Losses and LAE	$	622,881		$	492,955
Losses and LAE Paid for Claims Occurring During:
Current Year		(75,707	)		(72,897	)
Prior Years		(358,684	)		(323,761	)
Losses and LAE Payments	$	(434,391	)	$	(396,658	)
Foreign Currency Adjustment		11,688			(9,213	)
Net Reserves for Losses and LAE at End of Period		1,710,629			1,480,210
Reinsurance Recoverables on Unpaid Losses and LAE		847,505			787,917
Gross Reserves for Losses and LAE at End of Period	$	2,558,134		$	2,268,127

For the nine months ended September 30, 2017, our Incurred Losses and LAE increased $129.9 million as compared to the same period in 2016.

The Provision for Losses and LAE for Claims Occurring in the Current Year increased primarily due to additional net current accident year (“AY”) loss activity related to a higher level of catastrophe losses during the nine months ended September 30, 2017, including Hurricanes Maria ($26.4 million), Irma ($25.8 million) and Harvey ($17.1 million) and the Puebla, Mexico Earthquake ($3.5 million), as compared to the same period in 2016, which included the Alberta Wildfires, Ecuador Earthquake and Taiwan Earthquake. Additionally, growth in Net Earned Premium over the prior year added to the increase in the Provision for Losses and LAE for Claims Occurring in the Current Year.

In addition, we incurred $44.6 million of net prior AY reserve strengthening for the nine months ended September 30, 2017 primarily related to loss development in our Int’l Insurance reporting segment, large loss activity in our U.S. D&O division, strengthening of our U.S. casualty business and the settlement of a large claim in our GlobalRe reporting segment compared to $11.6 million of net prior AY reserve releases for the same period in 2016attributable to better than expected loss emergence within all three reporting segments.

For the nine months ended September 30, 2017, our Losses and LAE Payments increased $37.7 million as compared to the same period in 2016, primarily due to increased claim payments in our Int’l Insurance reporting segment.

Our September 30, 2017 Net Reserves for Losses and LAE includes estimated amounts for numerous catastrophe events. We caution that the magnitude and complexity of losses arising from these events inherently increases the level of uncertainty and therefore the level of management judgment involved in arriving at our estimated Net Reserves for Losses and LAE. As a result, our actual losses for these events may ultimately differ materially from our current estimates.

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Ceded Reinsurance

9 Months Ended

Sep. 30, 2017

Insurance [Abstract]

Ceded Reinsurance

NOTE 6. CEDED REINSURANCE

The following table lists our Company’s 10 largest reinsurers measured by the amount of total reinsurance recoverables as of September 30, 2017, and the reinsurers’ ratings from A.M. Best and S&P:

	Reinsurance Recoverables
	Unearned		Paid/Unpaid				Collateral
amounts in thousands	Premium		Losses (1)		Total		Held		A.M. Best	S&P
Everest Reinsurance Company	$	28,539		87,285		115,824		11,731	A+	A+
Swiss Reinsurance America Corporation		23,116		73,548		96,664		7,088	A+	AA-
National Indemnity Company		6,363		68,539		74,902		6,482	A++	AA+
Transatlantic Reinsurance Company		8,522		52,237		60,759		2,543	A+	A+
Munich Reinsurance America Inc.		11,094		46,158		57,252		4,898	A+	AA-
Aspen Insurance UK Ltd.		10,050		29,700		39,750		8,057	A	A
Employers Mutual Casualty Company		10,623		27,670		38,293		11,100	A	NR
Allied World Reinsurance		6,531		31,684		38,215		1,937	A	A-
Partner Reinsurance Europe		5,699		28,532		34,231		11,095	A	A+
Ace Property and Casualty Insurance Company		6,720		23,288		30,008		1,556	A++	AA
Top 10 Reinsurers	$	117,257		468,641		585,898		66,487
Others		113,917		439,918		553,835		105,129
Total	$	231,174		908,559		1,139,733		171,616

(1) - Net of reserve for uncollectable reinsurance of approximately $12.4 million.

We have established reserves for uncollectible reinsurance in the amounts of $12.4 million and $12.1 million as of September 30, 2017 and December 31, 2016, respectively.

Our Company holds collateral of $171.6 million, which consists of $129.3 million in ceded balances payable, $39.7 million in letters of credit and $2.6 million of funds held as trust account balances.   NIC and NSIC are required to collateralize reinsurance obligations due to us from reinsurers not authorized by their respective states of domicile.

The following table summarizes the components of Net losses and LAE incurred:

	Nine Months Ended September 30,
amounts in thousands	2017			2016
Direct	$	747,759		$	586,100
Assumed		124,730			69,657
Ceded		(249,608	)		(162,802	)
Net losses and LAE	$	622,881		$	492,955

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 7.  COMMITMENTS AND CONTINGENCIES

In 2013, the State of Connecticut (“the State”) awarded our Company up to $11.5 million ($8.0 million in loans and $3.5 million in grants) to move our corporate headquarters to Stamford, Connecticut.  The loan is non-interest bearing, has a term of 10 years and is subject to forgiveness based on our compliance with certain conditions set forth in the agreement with the State.  The amount of the loan to be received is dependent on our Company reaching certain milestones for creation of new jobs over a five-year period, and the funds are to be used to offset certain equipment purchases, facility costs, training of employees and other eligible project-related costs.  As of September 30, 2017, our Company has received $9.9 million of the award ($7.5 million in loans and $2.4 million of the grant) and earned a loan forgiveness credit of $7.0 million with the State. Our Company is recognizing the amount of loan and grants received over the period in which offsetting expenses are recognized. Our Company recognized $0.4 million and $0.9 million of the incentive for the three and nine months ended September 30, 2017. As of September 30, 2017 and December 31, 2016, our Company has deferred revenue of $4.8 million for both periods, which is included in Other Liabilities on the Consolidated Balance Sheets.

On February 16, 2017, our Company entered into a guarantee, pursuant to which it guaranteed all of the liabilities and obligations of NIIC (the “Guarantee”). The Guarantee will remain effective until all of such liabilities and obligations are discharged, and in the event that our Company does not meet its obligations under the Guarantee, any person who is covered by an insurance policy, certificate of coverage or reinsurance contract issued by NIIC will be a third party beneficiary under the Guarantee.  Our Company’s obligations under the Guarantee may be terminated by providing twelve months prior written notice to NIIC. However the obligations of our Company under the Guarantee terminate immediately in the event that (i) the majority of the outstanding voting capital stock in NIIC is sold to any non-affiliated entity; (ii) A.M. Best has confirmed that NIIC will receive the same financial strength rating as NIC or NSIC, without the benefit of the Guarantee; or (iii) NIIC withdraws its request to be rated by A.M. Best, provided that NIIC has not been downgraded within the prior twelve months.

In the ordinary course of conducting business, our Parent Company’s subsidiaries are involved in various legal proceedings. Most of these proceedings consist of claims litigation involving our Parent Company’s subsidiaries as either: (a) liability insurers defending or providing indemnity for third party claims brought against insureds or (b) insurers defending first party coverage claims brought against them. In general, our Company believes we have valid defenses to these cases. Our Company’s management believes that the ultimate liability, if any, with respect to these legal proceedings, after consideration of provisions made for potential losses and cost of defense, will not be material to our Company’s Consolidated Balance Sheets, Statements of Income and Statements of Cash Flows.

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

NOTE 8.  STOCK-BASED COMPENSATION

Stock-based compensation granted under our Company’s stock plans is expensed in tranches over the vesting period. Non-performance based grants generally vest equally over a three or four-year period. Performance units generally cliff vest three years after they are granted. For the nine months ended September 30, 2017, we granted 279,630 stock incentive units at a weighted average grant price of $55.74. Each performance unit and restricted stock unit represents a contingent right to receive one share of Common Stock as of the vesting date. Such Common Stock may be subject to forfeiture for the payment of any required tax withholding.

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Stockholders Equity

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Stockholders' Equity

NOTE 9. STOCKHOLDERS’ EQUITY

On September 14, 2017 our Company paid a dividend of $0.06 per share on The Navigators Group, Inc. Common Stock to Stockholders of record on August 24, 2017. 

The declaration and amount of any future dividend will be at the discretion of the Board of Directors, and will depend upon many factors, including financial condition, results of operations, business requirements, regulatory, legal constraints and other factors the Board of Directors deems relevant.

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Subsequent Events

9 Months Ended

Sep. 30, 2017

Subsequent Events [Abstract]

Subsequent Events

NOTE 10. SUBSEQUENT EVENTS

On November 2, 2017, our Board of Directors declared a cash dividend on our Company’s Common Stock of $0.06 per share, payable on December 15, 2017 to stockholders of record on November 24, 2017.

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Organization and Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Organization

Organization

We are an international insurance company with a long-standing area of specialization in Marine insurance. We also offer Property and Casualty (“P&C”) insurance, primarily general liability coverage and umbrella & excess liability coverage to commercial enterprises through our Primary and Excess Casualty divisions. We have also developed niches in Professional Liability insurance, through our Directors & Officers (“D&O”) and Errors & Omissions (“E&O”) divisions, as well as assumed reinsurance products.

We operate through various wholly-owned insurance and service companies. Our subsidiaries domiciled in the United States (“U.S.”) include two insurance companies, Navigators Insurance Company (“NIC”) and Navigators Specialty Insurance Company (“NSIC”), as well as our U.S. underwriting agency, Navigators Management Company (“NMC”). NIC includes a branch in the United Kingdom (“U.K”). We also have operations domiciled in the U.K., Hong Kong and Europe. Navigators International Insurance Company Ltd. (“NIIC”), Navigators Management (U.K.) Ltd. (“NMUK”) and Navigators Underwriting Ltd. (“NUL”) are domiciled in the U.K. and NUL includes European branches. Navigators Underwriting Agency Ltd. (“NUAL”), a Lloyd’s of London (“Lloyd’s”) underwriting agency, manages and provides the capital, through Navigators Corporate Underwriters Ltd. (“NCUL”), for our Lloyd’s Syndicate 1221 (the “Syndicate”), and is also domiciled in the U.K. We control 100% of the Syndicate’s stamp capacity.

Effective January 1, 2017, we sold our underwriting agency operations in Sweden and Denmark. The transaction represented a 100% disposition of our Sweden and Denmark corporations, NUAL AB and Navigators A/S, respectively. This transaction did not have a material impact on our financial statements.

Basis of Presentation

Basis of Presentation

The Consolidated Balance Sheet at September 30, 2017 and the Consolidated Statements of Income (Loss), Comprehensive Income (Loss), Stockholders’ Equity and Cash Flows for the periods ended September 30, 2017 and 2016 are unaudited. The Balance Sheet at December 31, 2016 is derived from our audited Financial Statements. The accompanying Interim Consolidated Financial Statements reflect all adjustments, which, in the opinion of management, are necessary to fairly present the results of our Company for the interim periods presented on the basis of U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X as promulgated by the U.S. Securities and Exchange Commission. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. All significant intercompany transactions and balances have been eliminated in consolidation. The preparation of these Financial Statements 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 reported revenues and expenses during the reporting periods. The results of operations for any interim period are not necessarily indicative of results for the full year. The Interim Consolidated Financial Statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2016. Certain amounts for the prior period have been reclassified to conform with the current period presentation.

Reclassification

Certain amounts for the prior period have been reclassified to conform with the current period presentation.

Income Taxes

Income Taxes

The interim income tax provision has been computed based on our estimated annual Effective Tax Rate, which represents our best estimate on a year to date basis for the interim period. As a result, the tax provision for a given quarter equals the difference between the provision recorded cumulatively year to date less the amount recorded cumulatively as of the end of the prior interim period. Our Effective Tax Rate for the quarter and year to date differs from the federal tax rate of 35% primarily due to an excess tax benefit related to the vesting of stock compensation at fair market value, tax-exempt investment income and dividends received deduction.

Starting in the first quarter of 2017, excess tax benefits related to the vesting of stock compensation were recognized as a reduction to Income Tax Expense rather than as an increase to Additional Paid-In Capital as a result of the adoption of the Accounting Standards Update (“ASU”) 2016-09 (see section New Accounting Standards Adopted in 2017 of this footnote for further information on the adoption of this standard).

Significant Accounting Policies

Significant Accounting Policies

There were no changes in our significant accounting policies subsequent to our Annual Report on Form 10-K for the year ended December 31, 2016.

New Accounting Standards Adopted in 2017

New Accounting Standards Adopted in 2017

Share-Based Compensation Accounting

Effective January 1, 2017, our Company adopted ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting” issued by the Financial Accounting Standards Board (the “FASB”). This guidance requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled, eliminates the requirement that excess tax benefits be realized before companies can recognize them, requires the presentation of excess tax benefits as an operating activity on the statement of cash flows, allows employers to increase the amounts withheld to cover income taxes on share-based compensation awards without requiring liability classification, requires the presentation of employee taxes paid as a financing activity on the statement of cash flows, and requires companies to elect whether they will account for award forfeitures by recognizing forfeitures only as they occur or by estimating the number of awards expected to be forfeited.

The requirement to recognize all income tax effects of awards in the income statement when the awards vest or are settled was adopted on a prospective basis. Previously, these amounts were recorded in Additional Paid-In Capital. This change also prospectively impacts the calculation of potential common shares used to determine Diluted Net Income per Common Share under the treasury stock method. The new standard requires that assumed proceeds under the treasury stock method be modified to exclude the amount of excess tax benefits that previously would have been recognized in Additional Paid-In Capital.

We elected to account for forfeitures of share-based payment awards by recognizing forfeitures of awards as they occur, and upon adoption of this guidance, the payment of employee taxes was retrospectively adjusted on the Consolidated Statements of Cash Flows to be classified as a financing activity. All other changes in the ASU did not result in cumulative-effect or retrospective adjustments. The adoption of this guidance did not materially impact our results of operations, financial condition or liquidity.

Transition to Equity Method of Accounting

Effective January 1, 2017, our Company adopted the ASU 2016-07, “Simplifying the Transition to the Equity Method of Accounting” issued by the FASB. This guidance eliminates the requirement to retrospectively apply equity method accounting when an investment that had been accounted for by another method initially qualifies for the equity method. Our Company did not have any investments transitioning to the equity method of accounting during the nine months ended September 30, 2017. The adoption of this guidance did not impact our results of operations, financial condition or liquidity.

Share-Based Compensation Modification Accounting

During the second quarter of 2017, our Company early adopted the ASU 2017-09, “Scope of Modification Accounting” issued by the FASB. This guidance clarifies when changes to the terms or conditions of a share-based award must be accounted for as modifications. Under the new guidance, modification accounting is required if the value, vesting conditions or classification of the award changes. This guidance will be applied prospectively to awards modified on or after the adoption date. The adoption of this guidance did not impact our results of operations, financial condition or liquidity.

Recently Issued Accounting Standards Not Yet Adopted

Recently Issued Accounting Standards Not Yet Adopted

Definition of a Business

In January 2017, the FASB issued ASU 2017-01, “Clarifying the Definition of a Business” with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This guidance is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years with early adoption permitted. This guidance will be applied prospectively to any transactions occurring within the period of adoption.

Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment” that eliminates the requirement to calculate the implied fair value of goodwill (i.e., Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, an impairment charge will be based on the excess of a reporting unit’s carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current goodwill impairment test). This guidance is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019, with early adoption permitted for annual and interim goodwill impairment testing dates after January 1, 2017. This guidance will be adopted on a prospective basis.

Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, “Premium Amortization on Purchased Callable Debt Securities” that shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. This guidance is effective for annual periods beginning after December 15, 2018, and interim periods within those fiscal years with early adoption permitted. This guidance will be adopted using a modified retrospective transition approach. The adoption of this guidance is not expected to materially impact our results of operations, financial condition or liquidity.

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Financial Data by Segment

Financial data by segment for the three and nine months ended September 30, 2017 and 2016 was as follows:

	Three Months Ended September 30, 2017
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	169,150		$	84,407		$	47,798		$	—		$	301,355
Net Losses and LAE		(135,340	)		(81,713	)		(59,118	)		—			(276,171	)
Commission Expenses		(18,286	)		(16,201	)		(11,233	)		211			(45,509	)
Other Operating Expenses		(25,375	)		(16,388	)		(4,010	)		—			(45,773	)
Other Underwriting Income (Expense)		125			—			94			(211	)		8
Underwriting Loss	$	(9,726	)	$	(29,895	)	$	(26,469	)	$	—		$	(66,090	)
Net Investment Income											22,598			22,598
Net Realized Gains											4,218			4,218
Interest Expense											(3,862	)		(3,862	)
Other Loss											(1,707	)		(1,707	)
Loss Before Income Taxes	$	(9,726	)	$	(29,895	)	$	(26,469	)	$	21,247		$	(44,843	)
Income Tax Benefit											16,864			16,864
Net Loss													$	(27,979	)
Losses and LAE Ratio		80.0	%		96.8	%		123.7	%					91.6	%
Commission Expense Ratio		10.8	%		19.2	%		23.5	%					15.1	%
Other Operating Expense Ratio (2)		14.9	%		19.4	%		8.2	%					15.2	%
Combined Ratio		105.7	%		135.4	%		155.4	%					121.9	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

	Three Months Ended September 30, 2016
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	161,722		$	79,761		$	42,527		$	—		$	284,010
Net Losses and LAE		(106,320	)		(45,043	)		(21,430	)		—			(172,793	)
Commission Expenses		(18,630	)		(15,348	)		(8,951	)		318			(42,611	)
Other Operating Expenses		(31,517	)		(20,183	)		(4,437	)		—			(56,137	)
Other Underwriting Income (Expense)		240			—			122			(318	)		44
Underwriting Profit (Loss)	$	5,495		$	(813	)	$	7,831		$	—		$	12,513
Net Investment Income											19,875			19,875
Net Realized Gains											1,586			1,586
Interest Expense											(3,859	)		(3,859	)
Other Loss											(227	)		(227	)
Income (Loss) Before Income Taxes	$	5,495		$	(813	)	$	7,831		$	17,375		$	29,888
Income Tax Expense											(7,875	)		(7,875	)
Net Income													$	22,013
Losses and LAE Ratio		65.7	%		56.5	%		50.4	%					60.8	%
Commission Expense Ratio		11.5	%		19.2	%		21.0	%					15.0	%
Other Operating Expense Ratio (2)		19.4	%		25.3	%		10.2	%					19.8	%
Combined Ratio		96.6	%		101.0	%		81.6	%					95.6	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

	Nine Months Ended September 30, 2017
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate (1)			Total
Net Earned Premiums	$	500,241		$	250,593		$	130,487		$	—		$	881,321
Net Losses and LAE		(339,436	)		(176,513	)		(106,932	)		—			(622,881	)
Commission Expenses		(59,130	)		(54,435	)		(28,695	)		734			(141,526	)
Other Operating Expenses		(91,987	)		(58,687	)		(14,403	)		—			(165,077	)
Other Underwriting Income (Expense)		335			—			439			(734	)		40
Underwriting Profit (Loss)	$	10,023		$	(39,042	)	$	(19,104	)	$	—		$	(48,123	)
Net Investment Income											66,311			66,311
Net Realized Gains											5,868			5,868
Interest Expense											(11,584	)		(11,584	)
Other Loss											(1,082	)		(1,082	)
Income (Loss) Before Income Taxes	$	10,023		$	(39,042	)	$	(19,104	)	$	59,513		$	11,390
Income Tax Benefit											2,243			2,243
Net Income													$	13,633
Losses and LAE Ratio		67.9	%		70.4	%		81.9	%					70.7	%
Commission Expense Ratio		11.8	%		21.7	%		22.0	%					16.1	%
Other Operating Expense Ratio (2)		18.3	%		23.5	%		10.7	%					18.7	%
Combined Ratio		98.0	%		115.6	%		114.6	%					105.5	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

	Nine Months Ended September 30, 2016
	U.S.			Int'l
amounts in thousands	Insurance			Insurance			GlobalRe			Corporate(1)			Total
Net Earned Premiums	$	462,446		$	235,602		$	118,312		$	—		$	816,360
Net Losses and LAE		(291,260	)		(133,519	)		(68,176	)		—			(492,955	)
Commission Expenses		(50,379	)		(47,524	)		(24,188	)		1,200			(120,891	)
Other Operating Expenses		(96,848	)		(64,997	)		(14,175	)		—			(176,020	)
Other Underwriting Income (Expense)		943			—			374			(1,200	)		117
Underwriting Profit (Loss)	$	24,902		$	(10,438	)	$	12,147		$	—		$	26,611
Net Investment Income											59,344			59,344
Net Realized Gains											4,993			4,993
Interest Expense											(11,575	)		(11,575	)
Other Income											6,679			6,679
Income (Loss) Before Income Taxes	$	24,902		$	(10,438	)	$	12,147		$	59,441		$	86,052
Income Tax Expense											(24,917	)		(24,917	)
Net Income													$	61,135
Losses and LAE Ratio		63.0	%		56.7	%		57.6	%					60.4	%
Commission Expense Ratio		10.9	%		20.2	%		20.4	%					14.8	%
Other Operating Expense Ratio (2)		20.7	%		27.5	%		11.7	%					21.5	%
Combined Ratio		94.6	%		104.4	%		89.7	%					96.7	%

(1) - Includes Corporate segment intercompany eliminations.

(2) - Includes Other Operating Expenses and Other Underwriting Income (Expense).

Revenue by Operating Segment

Revenue by operating segment for the three and nine months ended September 30, 2017 and 2016 was as follows:

	Three Months Ended September 30, 2017									Three Months Ended September 30, 2016									% Change
amounts in thousands	Gross Written Premiums		Ceded Written Premiums			NetWritten Premiums		Net Earned Premiums		Gross Written Premiums		Ceded Written Premiums			Net Written Premiums		Net Earned Premiums		Gross Written Premiums			Ceded Written Premiums			NetWritten Premiums			Net Earned Premiums
U.S. Insurance
Marine	$	36,403	$	(18,859	)	$	17,544	$	20,129	$	40,271	$	(17,636	)	$	22,635	$	25,465		(9.6	%)		6.9	%		(22.5	%)		(21.0	%)
P&C		166,097		(39,952	)		126,145		125,931		161,600		(36,011	)		125,589		115,971		2.8	%		10.9	%		0.4	%		8.6	%
ProfessionalLiability		32,552		(5,517	)		27,035		23,090		32,776		(7,712	)		25,064		20,286		(0.7	%)		(28.5	%)		7.9	%		13.8	%
Total	$	235,052	$	(64,328	)	$	170,724	$	169,150	$	234,647	$	(61,359	)	$	173,288	$	161,722		0.2	%		4.8	%		(1.5	%)		4.6	%
Int'l Insurance
Marine	$	41,689	$	(9,948	)	$	31,741	$	39,038	$	38,453	$	(12,631	)	$	25,822	$	34,794		8.4	%		(21.2	%)		22.9	%		12.2	%
P&C		37,415		(19,772	)		17,643		21,775		38,077		(15,331	)		22,746		25,584		(1.7	%)		29.0	%		(22.4	%)		(14.9	%)
Professional Liability		34,497		(9,246	)		25,251		23,594		27,954		(7,232	)		20,722		19,383		23.4	%		27.8	%		21.9	%		21.7	%
Total	$	113,601	$	(38,966	)	$	74,635	$	84,407	$	104,484	$	(35,194	)	$	69,290	$	79,761		8.7	%		10.7	%		7.7	%		5.8	%
GlobalRe	$	53,385	$	(2,728	)	$	50,657	$	47,798	$	35,799	$	(1,376	)	$	34,423	$	42,527		49.1	%		98.3	%		47.2	%		12.4	%
Total	$	402,038	$	(106,022	)	$	296,016	$	301,355	$	374,930	$	(97,929	)	$	277,001	$	284,010		7.2	%		8.3	%		6.9	%		6.1	%

	Nine Months Ended September 30, 2017									Nine Months Ended September 30, 2016									% Change
amounts in thousands	Gross Written Premiums		Ceded Written Premiums			NetWritten Premiums		Net Earned Premiums		Gross Written Premiums		Ceded Written Premiums			NetWritten Premiums		Net Earned Premiums		Gross Written Premiums			Ceded Written Premiums			NetWritten Premiums			Net Earned Premiums
U.S. Insurance
Marine	$	119,040	$	(55,830	)	$	63,210	$	64,635	$	129,621	$	(53,823	)	$	75,798	$	73,636		(8.2	%)		3.7	%		(16.6	%)		(12.2	%)
P&C		524,223		(129,297	)		394,926		366,280		471,532		(103,286	)		368,246		335,342		11.2	%		25.2	%		7.2	%		9.2	%
ProfessionalLiability		86,580		(14,545	)		72,035		69,326		88,065		(21,365	)		66,700		53,468		(1.7	%)		(31.9	%)		8.0	%		29.7	%
Total	$	729,843	$	(199,672	)	$	530,171	$	500,241	$	689,218	$	(178,474	)	$	510,744	$	462,446		5.9	%		11.9	%		3.8	%		8.2	%
Int'l Insurance
Marine	$	160,119	$	(33,410	)	$	126,709	$	116,058	$	151,548	$	(33,274	)	$	118,274	$	109,746		5.7	%		0.4	%		7.1	%		5.8	%
P&C		124,446		(69,780	)		54,666		67,292		145,125		(57,025	)		88,100		70,608		(14.2	%)		22.4	%		(37.9	%)		(4.7	%)
ProfessionalLiability		102,089		(26,178	)		75,911		67,243		87,694		(21,776	)		65,918		55,248		16.4	%		20.2	%		15.2	%		21.7	%
Total	$	386,654	$	(129,368	)	$	257,286	$	250,593	$	384,367	$	(112,075	)	$	272,292	$	235,602		0.6	%		15.4	%		(5.5	%)		6.4	%
GlobalRe	$	188,025	$	(9,021	)	$	179,004	$	130,487	$	127,787	$	(7,467	)	$	120,320	$	118,312		47.1	%		20.8	%		48.8	%		10.3	%
Total	$	1,304,522	$	(338,061	)	$	966,461	$	881,321	$	1,201,372	$	(298,016	)	$	903,356	$	816,360		8.6	%		13.4	%		7.0	%		8.0	%

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Investments (Tables)

9 Months Ended

Sep. 30, 2017

Investments Debt And Equity Securities [Abstract]

Available-for-Sale Investments Including Other-Than-Temporarily Impaired Securities Recognized within Accumulated Other Comprehensive Income

The following tables set forth our Company’s available-for-sale investments as of September 30, 2017 and December 31, 2016 and include Other-Than-Temporary-Impairment (“OTTI”) securities recognized within Accumulated Other Comprehensive Income (“AOCI”):

	September 30, 2017
			Gross		Gross			Cost or
	Fair		Unrealized		Unrealized			Amortized
amounts in thousands	Value		Gains		(Losses)			Cost
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	269,851	$	8,169	$	(607	)	$	262,289
States, Municipalities and Political Subdivisions		684,792		20,643		(1,481	)		665,630
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		426,441		3,365		(4,298	)		427,374
Residential Mortgage Obligations		34,748		570		(27	)		34,205
Asset-Backed Securities		331,646		2,503		(426	)		329,569
Commercial Mortgage-Backed Securities		140,601		2,742		(1,308	)		139,167
Subtotal	$	933,436	$	9,180	$	(6,059	)	$	930,315
Corporate Exposures (1)		910,106		18,221		(1,983	)		893,868
Total Fixed Maturities	$	2,798,185	$	56,213	$	(10,130	)	$	2,752,102
Equity Securities:
Common Stocks	$	180,771	$	35,179	$	(815	)	$	146,407
Preferred Stocks		195,105		7,418		(645	)		188,332
Total Equity Securities	$	375,876	$	42,597	$	(1,460	)	$	334,739
Short-Term Investments		247,607		5		—			247,602
Total Investments	$	3,421,668	$	98,815	$	(11,590	)	$	3,334,443

(1) - Corporate Exposures consist of investments in corporate bonds, hybrid bonds and redeemable preferred stocks.

	December 31, 2016
			Gross		Gross			Cost or
	Fair		Unrealized		Unrealized			Amortized
amounts in thousands	Value		Gains		(Losses)			Cost
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	273,776	$	2,192	$	(5,128	)	$	276,712
States, Municipalities and Political Subdivisions		547,415		11,542		(4,036	)		539,909
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		487,364		4,016		(6,585	)		489,933
Residential Mortgage Obligations		20,530		453		(55	)		20,132
Asset-Backed Securities		314,601		824		(1,178	)		314,955
Commercial Mortgage-Backed Securities		154,139		2,859		(1,904	)		153,184
Subtotal	$	976,634	$	8,152	$	(9,722	)	$	978,204
Corporate Exposures (1)		838,057		10,185		(5,528	)		833,400
Total Fixed Maturities	$	2,635,882	$	32,071	$	(24,414	)	$	2,628,225
Equity Securities:
Common Stocks	$	164,087	$	24,677	$	(964	)	$	140,374
Preferred Stocks		185,055		2,339		(4,821	)		187,537
Total Equity Securities	$	349,142	$	27,016	$	(5,785	)	$	327,911
Short-Term Investments		143,539		88		—			143,451
Total Investments	$	3,128,563	$	59,175	$	(30,199	)	$	3,099,587

(1) - Corporate Exposures consist of investments in corporate bonds, hybrid bonds and redeemable preferred stocks.

Scheduled Maturity Dates for Fixed Maturity Securities by Number of Years Until Maturity

The contractual maturity dates for Fixed Maturities categorized by the number of years until maturity as of September 30, 2017 are shown in the following table:

	September 30, 2017
	Fair		Amortized
amounts in thousands	Value		Cost
Due in one year or less	$	218,780	$	216,537
Due after one year through five years		708,302		697,520
Due after five years through ten years		333,260		324,180
Due after ten years		604,407		583,550
Mortgage-Backed and Asset-Backed Securities		933,436		930,315
Total	$	2,798,185	$	2,752,102

Summary of Aggregate Fair Value and Gross Unrealized Loss by Length of Time Securities had Continuously been in Gross Unrealized Loss Position

The following tables summarize all securities in a gross unrealized loss position as of September 30, 2017 and December 31, 2016, showing the aggregate fair value and gross unrealized loss by the length of time those securities have continuously been in a gross unrealized loss position:

	September 30, 2017
	Less than 12 months					Greater than 12 months					Total
			Gross					Gross					Gross
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
amounts in thousands	Value		(Losses)			Value		(Losses)			Value		(Losses)
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	67,562	$	(344	)	$	31,928	$	(263	)	$	99,490	$	(607	)
States, Municipalities and Political Subdivisions		80,570		(732	)		31,125		(749	)		111,695		(1,481	)
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		237,804		(2,846	)		56,656		(1,452	)		294,460		(4,298	)
Residential Mortgage Obligations		7,899		(6	)		586		(21	)		8,485		(27	)
Asset-Backed Securities		69,885		(379	)		4,942		(47	)		74,827		(426	)
Commercial Mortgage-Backed Securities		41,572		(594	)		7,924		(714	)		49,496		(1,308	)
Subtotal	$	357,160	$	(3,825	)	$	70,108	$	(2,234	)	$	427,268	$	(6,059	)
Corporate Exposures		150,289		(915	)		93,463		(1,068	)		243,752		(1,983	)
Total Fixed Maturities	$	655,581	$	(5,816	)	$	226,624	$	(4,314	)	$	882,205	$	(10,130	)
Equity Securities:
Common Stocks	$	15,633	$	(814	)	$	87	$	(1	)	$	15,720	$	(815	)
Preferred Stocks		31,775		(614	)		667		(31	)		32,442		(645	)
Total Equity Securities	$	47,408	$	(1,428	)	$	754	$	(32	)	$	48,162	$	(1,460	)
Total Fixed Maturities and Equity Securities	$	702,989	$	(7,244	)	$	227,378	$	(4,346	)	$	930,367	$	(11,590	)

	December 31, 2016
	Less than 12 months					Greater than 12 months					Total
			Gross					Gross					Gross
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
amounts in thousands	Value		(Losses)			Value		(Losses)			Value		(Losses)
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	150,891	$	(2,570	)	$	16,819	$	(2,558	)	$	167,710	$	(5,128	)
States, Municipalities and Political Subdivisions		137,731		(3,111	)		13,255		(925	)		150,986		(4,036	)
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		349,119		(6,155	)		12,401		(430	)		361,520		(6,585	)
Residential Mortgage Obligations		953		(18	)		926		(37	)		1,879		(55	)
Asset-Backed Securities		95,514		(970	)		48,093		(208	)		143,607		(1,178	)
Commercial Mortgage-Backed Securities		51,932		(1,164	)		7,910		(740	)		59,842		(1,904	)
Subtotal	$	497,518	$	(8,307	)	$	69,330	$	(1,415	)	$	566,848	$	(9,722	)
Corporate Exposures		325,733		(5,086	)		26,005		(442	)		351,738		(5,528	)
Total Fixed Maturities	$	1,111,873	$	(19,074	)	$	125,409	$	(5,340	)	$	1,237,282	$	(24,414	)
Equity Securities:
Common Stocks	$	31,272	$	(634	)	$	1,471	$	(330	)	$	32,743	$	(964	)
Preferred Stocks		113,742		(4,785	)		523		(36	)		114,265		(4,821	)
Total Equity Securities	$	145,014	$	(5,419	)	$	1,994	$	(366	)	$	147,008	$	(5,785	)
Total Fixed Maturities and Equity Securities	$	1,256,887	$	(24,493	)	$	127,403	$	(5,706	)	$	1,384,290	$	(30,199	)

Summary of Cumulative Amounts Related to Credit Loss Portion of Other-Than-Temporary Impairment Losses on Debt Securities

The following table summarizes the cumulative amounts related to our Company’s credit loss portion of the OTTI losses on Fixed Maturities for the three and nine months ended September 30, 2017 and 2016

	Three Months Ended September 30,					Nine Months Ended September 30,
amounts in thousands	2017		2016			2017		2016
Beginning Balance	$	2,361	$	2,511		$	2,361	$	2,361
Additions for Credit Loss Impairments recognized in the    current period on securities not previously impaired		—		—			—		150
Additions for Credit Loss Impairments recognized in the    current period on securities previously impaired		—		—			—		—
Reductions for Credit Loss Impairments previously    recognized  on securities sold during the period		—		(150	)		—		(150	)
Ending Balance	$	2,361	$	2,361		$	2,361	$	2,361

Net Investment Income

Our Company’s Net Investment Income was derived from the following sources:

	Three Months Ended September 30,						Nine Months Ended September 30,
amounts in thousands	2017			2016			2017			2016
Fixed Maturities	$	19,491		$	17,124		$	57,019		$	50,781
Equity Securities		3,774			3,540			11,337			10,418
Short-Term Investments		250			70			662			568
Total Investment Income	$	23,515		$	20,734		$	69,018		$	61,767
Investment Expenses		(917	)		(859	)		(2,707	)		(2,423	)
Net Investment Income	$	22,598		$	19,875		$	66,311		$	59,344

Realized Gains and Losses, Excluding Net Other-Than-Temporary Impairment Losses Recognized in Earnings

Realized Gains and Losses, excluding net OTTI losses recognized in earnings, for the periods indicated, were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
amounts in thousands	2017			2016			2017			2016
Fixed Maturities:
Gains	$	2,589		$	1,356		$	3,401		$	5,200
Losses		(900	)		(1,221	)		(3,114	)		(3,086	)
Fixed Maturities, Net	$	1,689		$	135		$	287		$	2,114
Short-Term:
Gains	$	767		$	128		$	1,014		$	803
Losses		(111	)		(107	)		(371	)		(250	)
Short-Term, Net	$	656		$	21		$	643		$	553
Equity Securities:
Gains	$	2,863		$	1,443		$	7,249		$	3,123
Losses		(18	)		(13	)		(246	)		(647	)
Equity Securities, Net	$	2,845		$	1,430		$	7,003		$	2,476
Net Realized Gains	$	5,190		$	1,586		$	7,933		$	5,143

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Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fixed Maturities and Equity Securities by Asset Class that are Measured at Fair Value

The following tables present, for each of the fair value hierarchy levels as defined by the accounting guidance for fair value measurements described above, our Company’s Fixed Maturities and Equity Securities by asset class that are measured at fair value on a recurring basis, as well as the fair value of the 5.75% Senior Notes due October 15, 2023 (the “Senior Notes”) carried at amortized cost as of September 30, 2017 and December 31, 2016:

	September 30, 2017
amounts in thousands	Level 1		Level 2		Level 3		Total
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	51,612	$	218,239	$	—	$	269,851
States, Municipalities and Political Subdivisions		—		684,792		—		684,792
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		—		426,441		—		426,441
Residential Mortgage Obligations		—		34,748		—		34,748
Asset-Backed Securities		—		331,646		—		331,646
Commercial Mortgage-Backed Securities		—		140,601		—		140,601
Subtotal	$	—	$	933,436	$	—	$	933,436
Corporate Exposures		—		910,106		—		910,106
Total Fixed Maturities	$	51,612	$	2,746,573	$	—	$	2,798,185
Equity Securities:
Common Stocks	$	180,771	$	—	$	—	$	180,771
Preferred Stocks		—		195,105		—		195,105
Total Equity Securities	$	180,771	$	195,105	$	—	$	375,876
Short-Term Investments		247,607		—		—		247,607
Total Assets Measured at Fair Value	$	479,990	$	2,941,678	$	—	$	3,421,668
Senior Notes	$	—	$	282,073	$	—	$	282,073
Total Liabilities Measured at Fair Value	$	—	$	282,073	$	—	$	282,073

	December 31, 2016
amounts in thousands	Level 1		Level 2		Level 3		Total
Fixed Maturities:
U.S. Treasury Bonds, Agency Bonds and Foreign    Government Bonds	$	47,704	$	226,072	$	—	$	273,776
States, Municipalities and Political Subdivisions		—		547,415		—		547,415
Mortgage-Backed and Asset-Backed Securities:
Agency Mortgage-Backed Securities		—		487,364		—		487,364
Residential Mortgage Obligations		—		20,530		—		20,530
Asset-Backed Securities		—		314,601		—		314,601
Commercial Mortgage-Backed Securities		—		154,139		—		154,139
Subtotal	$	—	$	976,634	$	—	$	976,634
Corporate Exposures		—		838,057		—		838,057
Total Fixed Maturities	$	47,704	$	2,588,178	$	—	$	2,635,882
Equity Securities:
Common Stocks	$	164,087	$	—	$	—	$	164,087
Preferred Stocks		—		185,055		—		185,055
Total Equity Securities	$	164,087	$	185,055	$	—	$	349,142
Short-Term Investments		143,539		—		—		143,539
Total Assets Measured at Fair Value	$	355,330	$	2,773,233	$	—	$	3,128,563
Senior Notes	$	—	$	280,316	$	—	$	280,316
Total Liabilities Measured at Fair Value	$	—	$	280,316	$	—	$	280,316

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Loss Reserves (Tables)

9 Months Ended

Sep. 30, 2017

Insurance [Abstract]

Summary of Reserves for Losses and LAE Activity

The following table summarizes our Company’s Reserves for Losses and LAE activity for the nine months ended September 30, 2017 and 2016:

	For the Nine Months Ended September 30,
amounts in thousands	2017			2016
Net Reserves for Losses and LAE at Beginning of Year	$	1,510,451		$	1,393,126
Provision for Losses and LAE for Claims Occurring in the Current Year		578,272			504,599
Increase (Decrease) in Estimated Losses and LAE for Claims Occurring in Prior Years		44,609			(11,644	)
Incurred Losses and LAE	$	622,881		$	492,955
Losses and LAE Paid for Claims Occurring During:
Current Year		(75,707	)		(72,897	)
Prior Years		(358,684	)		(323,761	)
Losses and LAE Payments	$	(434,391	)	$	(396,658	)
Foreign Currency Adjustment		11,688			(9,213	)
Net Reserves for Losses and LAE at End of Period		1,710,629			1,480,210
Reinsurance Recoverables on Unpaid Losses and LAE		847,505			787,917
Gross Reserves for Losses and LAE at End of Period	$	2,558,134		$	2,268,127

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Ceded Reinsurance (Tables)

9 Months Ended

Sep. 30, 2017

Insurance [Abstract]

Lists of 10 Largest Reinsurers Measured by Reinsurance Recoverable

The following table lists our Company’s 10 largest reinsurers measured by the amount of total reinsurance recoverables as of September 30, 2017, and the reinsurers’ ratings from A.M. Best and S&P:

	Reinsurance Recoverables
	Unearned		Paid/Unpaid				Collateral
amounts in thousands	Premium		Losses (1)		Total		Held		A.M. Best	S&P
Everest Reinsurance Company	$	28,539		87,285		115,824		11,731	A+	A+
Swiss Reinsurance America Corporation		23,116		73,548		96,664		7,088	A+	AA-
National Indemnity Company		6,363		68,539		74,902		6,482	A++	AA+
Transatlantic Reinsurance Company		8,522		52,237		60,759		2,543	A+	A+
Munich Reinsurance America Inc.		11,094		46,158		57,252		4,898	A+	AA-
Aspen Insurance UK Ltd.		10,050		29,700		39,750		8,057	A	A
Employers Mutual Casualty Company		10,623		27,670		38,293		11,100	A	NR
Allied World Reinsurance		6,531		31,684		38,215		1,937	A	A-
Partner Reinsurance Europe		5,699		28,532		34,231		11,095	A	A+
Ace Property and Casualty Insurance Company		6,720		23,288		30,008		1,556	A++	AA
Top 10 Reinsurers	$	117,257		468,641		585,898		66,487
Others		113,917		439,918		553,835		105,129
Total	$	231,174		908,559		1,139,733		171,616

(1) - Net of reserve for uncollectable reinsurance of approximately $12.4 million.

Summary of Components of Net Losses and Loss Adjustment Expenses Incurred

The following table summarizes the components of Net losses and LAE incurred:

	Nine Months Ended September 30,
amounts in thousands	2017			2016
Direct	$	747,759		$	586,100
Assumed		124,730			69,657
Ceded		(249,608	)		(162,802	)
Net losses and LAE	$	622,881		$	492,955

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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) Insurance	Jan. 01, 2017
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of insurance companies | Insurance	2
Percentage of ownership interest sold		100.00%
Federal tax rate	35.00%
Investments transitioning to equity method of accounting | $	$ 0
Syndicate 1221
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage control of stamp capacity	100.00%

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Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017 Segment
Segment Reporting Information [Line Items]
Number of underwriting Segments	3
U.S.Insurance
Segment Reporting Information [Line Items]
Number of Operating Segments	3
International Insurance
Segment Reporting Information [Line Items]
Number of Operating Segments	3

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Financial Data by Segment (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net Earned Premiums		$ 301,355	$ 284,010	$ 881,321	$ 816,360
Net Losses and LAE		(276,171)	(172,793)	(622,881)	(492,955)
Commission Expenses		(45,509)	(42,611)	(141,526)	(120,891)
Other Operating Expenses		(45,773)	(56,137)	(165,077)	(176,020)
Other Underwriting Income (Expense)		8	44	40	117
Underwriting Profit (Loss)		(66,090)	12,513	(48,123)	26,611
Net Investment Income		22,598	19,875	66,311	59,344
Net Realized Gains		4,218	1,586	5,868	4,993
Interest Expense		(3,862)	(3,859)	(11,584)	(11,575)
Other Income (Loss)		(1,707)	(227)	(1,082)	6,679
Income (Loss) Before Income Taxes		(44,843)	29,888	11,390	86,052
Income Tax Benefit (Expense)		16,864	(7,875)	2,243	(24,917)
Net Income (Loss)		$ (27,979)	$ 22,013	$ 13,633	$ 61,135
Losses and LAE Ratio		91.60%	60.80%	70.70%	60.40%
Commission Expense Ratio		15.10%	15.00%	16.10%	14.80%
Other Operating Expense Ratio	[1]	15.20%	19.80%	18.70%	21.50%
Combined Ratio		121.90%	95.60%	105.50%	96.70%
U.S.Insurance
Segment Reporting Information [Line Items]
Net Earned Premiums		$ 169,150	$ 161,722	$ 500,241	$ 462,446
Net Losses and LAE		(135,340)	(106,320)	(339,436)	(291,260)
Commission Expenses		(18,286)	(18,630)	(59,130)	(50,379)
Other Operating Expenses		(25,375)	(31,517)	(91,987)	(96,848)
Other Underwriting Income (Expense)		125	240	335	943
Underwriting Profit (Loss)		(9,726)	5,495	10,023	24,902
Income (Loss) Before Income Taxes		$ (9,726)	$ 5,495	$ 10,023	$ 24,902
Losses and LAE Ratio		80.00%	65.70%	67.90%	63.00%
Commission Expense Ratio		10.80%	11.50%	11.80%	10.90%
Other Operating Expense Ratio	[1]	14.90%	19.40%	18.30%	20.70%
Combined Ratio		105.70%	96.60%	98.00%	94.60%
International Insurance
Segment Reporting Information [Line Items]
Net Earned Premiums		$ 84,407	$ 79,761	$ 250,593	$ 235,602
Net Losses and LAE		(81,713)	(45,043)	(176,513)	(133,519)
Commission Expenses		(16,201)	(15,348)	(54,435)	(47,524)
Other Operating Expenses		(16,388)	(20,183)	(58,687)	(64,997)
Underwriting Profit (Loss)		(29,895)	(813)	(39,042)	(10,438)
Income (Loss) Before Income Taxes		$ (29,895)	$ (813)	$ (39,042)	$ (10,438)
Losses and LAE Ratio		96.80%	56.50%	70.40%	56.70%
Commission Expense Ratio		19.20%	19.20%	21.70%	20.20%
Other Operating Expense Ratio	[1]	19.40%	25.30%	23.50%	27.50%
Combined Ratio		135.40%	101.00%	115.60%	104.40%
Global Reinsurance
Segment Reporting Information [Line Items]
Net Earned Premiums		$ 47,798	$ 42,527	$ 130,487	$ 118,312
Net Losses and LAE		(59,118)	(21,430)	(106,932)	(68,176)
Commission Expenses		(11,233)	(8,951)	(28,695)	(24,188)
Other Operating Expenses		(4,010)	(4,437)	(14,403)	(14,175)
Other Underwriting Income (Expense)		94	122	439	374
Underwriting Profit (Loss)		(26,469)	7,831	(19,104)	12,147
Income (Loss) Before Income Taxes		$ (26,469)	$ 7,831	$ (19,104)	$ 12,147
Losses and LAE Ratio		123.70%	50.40%	81.90%	57.60%
Commission Expense Ratio		23.50%	21.00%	22.00%	20.40%
Other Operating Expense Ratio	[1]	8.20%	10.20%	10.70%	11.70%
Combined Ratio		155.40%	81.60%	114.60%	89.70%
Corporate
Segment Reporting Information [Line Items]
Net Investment Income	[2]	$ 22,598	$ 19,875	$ 66,311	$ 59,344
Net Realized Gains	[2]	4,218	1,586	5,868	4,993
Interest Expense	[2]	(3,862)	(3,859)	(11,584)	(11,575)
Other Income (Loss)	[2]	(1,707)	(227)	(1,082)	6,679
Income (Loss) Before Income Taxes	[2]	21,247	17,375	59,513	59,441
Income Tax Benefit (Expense)	[2]	16,864	(7,875)	2,243	(24,917)
Intersegment Elimination
Segment Reporting Information [Line Items]
Commission Expenses	[2]	211	318	734	1,200
Other Underwriting Income (Expense)	[2]	$ (211)	$ (318)	$ (734)	$ (1,200)

[1] Includes Other Operating Expenses and Other Underwriting Income (Expense).

[2] Includes Corporate segment intercompany eliminations.

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Revenue by Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 402,038	$ 374,930	$ 1,304,522	$ 1,201,372
Ceded Written Premiums	(106,022)	(97,929)	(338,061)	(298,016)
Net Written Premiums	296,016	277,001	966,461	903,356
Net Earned Premiums	$ 301,355	284,010	$ 881,321	816,360
% Change Gross Written Premiums	7.20%		8.60%
% Change Ceded Written Premiums	8.30%		13.40%
% Change Net Written Premiums	6.90%		7.00%
% Change Net Earned Premiums	6.10%		8.00%
U.S.Insurance
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 235,052	234,647	$ 729,843	689,218
Ceded Written Premiums	(64,328)	(61,359)	(199,672)	(178,474)
Net Written Premiums	170,724	173,288	530,171	510,744
Net Earned Premiums	$ 169,150	161,722	$ 500,241	462,446
% Change Gross Written Premiums	0.20%		5.90%
% Change Ceded Written Premiums	4.80%		11.90%
% Change Net Written Premiums	(1.50%)		3.80%
% Change Net Earned Premiums	4.60%		8.20%
U.S.Insurance | Marine
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 36,403	40,271	$ 119,040	129,621
Ceded Written Premiums	(18,859)	(17,636)	(55,830)	(53,823)
Net Written Premiums	17,544	22,635	63,210	75,798
Net Earned Premiums	$ 20,129	25,465	$ 64,635	73,636
% Change Gross Written Premiums	(9.60%)		(8.20%)
% Change Ceded Written Premiums	6.90%		3.70%
% Change Net Written Premiums	(22.50%)		(16.60%)
% Change Net Earned Premiums	(21.00%)		(12.20%)
U.S.Insurance | Property Casualty
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 166,097	161,600	$ 524,223	471,532
Ceded Written Premiums	(39,952)	(36,011)	(129,297)	(103,286)
Net Written Premiums	126,145	125,589	394,926	368,246
Net Earned Premiums	$ 125,931	115,971	$ 366,280	335,342
% Change Gross Written Premiums	2.80%		11.20%
% Change Ceded Written Premiums	10.90%		25.20%
% Change Net Written Premiums	0.40%		7.20%
% Change Net Earned Premiums	8.60%		9.20%
U.S.Insurance | Professional Liability
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 32,552	32,776	$ 86,580	88,065
Ceded Written Premiums	(5,517)	(7,712)	(14,545)	(21,365)
Net Written Premiums	27,035	25,064	72,035	66,700
Net Earned Premiums	$ 23,090	20,286	$ 69,326	53,468
% Change Gross Written Premiums	(0.70%)		(1.70%)
% Change Ceded Written Premiums	(28.50%)		(31.90%)
% Change Net Written Premiums	7.90%		8.00%
% Change Net Earned Premiums	13.80%		29.70%
International Insurance
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 113,601	104,484	$ 386,654	384,367
Ceded Written Premiums	(38,966)	(35,194)	(129,368)	(112,075)
Net Written Premiums	74,635	69,290	257,286	272,292
Net Earned Premiums	$ 84,407	79,761	$ 250,593	235,602
% Change Gross Written Premiums	8.70%		0.60%
% Change Ceded Written Premiums	10.70%		15.40%
% Change Net Written Premiums	7.70%		(5.50%)
% Change Net Earned Premiums	5.80%		6.40%
International Insurance | Marine
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 41,689	38,453	$ 160,119	151,548
Ceded Written Premiums	(9,948)	(12,631)	(33,410)	(33,274)
Net Written Premiums	31,741	25,822	126,709	118,274
Net Earned Premiums	$ 39,038	34,794	$ 116,058	109,746
% Change Gross Written Premiums	8.40%		5.70%
% Change Ceded Written Premiums	(21.20%)		0.40%
% Change Net Written Premiums	22.90%		7.10%
% Change Net Earned Premiums	12.20%		5.80%
International Insurance | Property Casualty
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 37,415	38,077	$ 124,446	145,125
Ceded Written Premiums	(19,772)	(15,331)	(69,780)	(57,025)
Net Written Premiums	17,643	22,746	54,666	88,100
Net Earned Premiums	$ 21,775	25,584	$ 67,292	70,608
% Change Gross Written Premiums	(1.70%)		(14.20%)
% Change Ceded Written Premiums	29.00%		22.40%
% Change Net Written Premiums	(22.40%)		(37.90%)
% Change Net Earned Premiums	(14.90%)		(4.70%)
International Insurance | Professional Liability
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 34,497	27,954	$ 102,089	87,694
Ceded Written Premiums	(9,246)	(7,232)	(26,178)	(21,776)
Net Written Premiums	25,251	20,722	75,911	65,918
Net Earned Premiums	$ 23,594	19,383	$ 67,243	55,248
% Change Gross Written Premiums	23.40%		16.40%
% Change Ceded Written Premiums	27.80%		20.20%
% Change Net Written Premiums	21.90%		15.20%
% Change Net Earned Premiums	21.70%		21.70%
Global Reinsurance
Segment Reporting Information [Line Items]
Gross Written Premiums	$ 53,385	35,799	$ 188,025	127,787
Ceded Written Premiums	(2,728)	(1,376)	(9,021)	(7,467)
Net Written Premiums	50,657	34,423	179,004	120,320
Net Earned Premiums	$ 47,798	$ 42,527	$ 130,487	$ 118,312
% Change Gross Written Premiums	49.10%		47.10%
% Change Ceded Written Premiums	98.30%		20.80%
% Change Net Written Premiums	47.20%		48.80%
% Change Net Earned Premiums	12.40%		10.30%

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Available-for-Sale Investments Including Other-Than-Temporarily Impaired Securities Recognized within Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Gain (Loss) on Investments [Line Items]
Total investments		$ 3,421,668	$ 3,128,563
Gross Unrealized Gains		98,815	59,175
Gross Unrealized Losses		(11,590)	(30,199)
Amortized Cost		3,334,443	3,099,587
Fixed Maturities
Gain (Loss) on Investments [Line Items]
Total investments		2,798,185	2,635,882
Gross Unrealized Gains		56,213	32,071
Gross Unrealized Losses		(10,130)	(24,414)
Amortized Cost		2,752,102	2,628,225
Fixed Maturities | U.S. Treasury Bonds, Agency Bonds and Foreign Government Bonds
Gain (Loss) on Investments [Line Items]
Total investments		269,851	273,776
Gross Unrealized Gains		8,169	2,192
Gross Unrealized Losses		(607)	(5,128)
Amortized Cost		262,289	276,712
Fixed Maturities | States, Municipalities and Political Subdivisions
Gain (Loss) on Investments [Line Items]
Total investments		684,792	547,415
Gross Unrealized Gains		20,643	11,542
Gross Unrealized Losses		(1,481)	(4,036)
Amortized Cost		665,630	539,909
Fixed Maturities | Agency Mortgage-Backed Securities
Gain (Loss) on Investments [Line Items]
Total investments		426,441	487,364
Gross Unrealized Gains		3,365	4,016
Gross Unrealized Losses		(4,298)	(6,585)
Amortized Cost		427,374	489,933
Fixed Maturities | Residential Mortgage Backed Securities
Gain (Loss) on Investments [Line Items]
Total investments		34,748	20,530
Gross Unrealized Gains		570	453
Gross Unrealized Losses		(27)	(55)
Amortized Cost		34,205	20,132
Fixed Maturities | Asset-Backed Securities
Gain (Loss) on Investments [Line Items]
Total investments		331,646	314,601
Gross Unrealized Gains		2,503	824
Gross Unrealized Losses		(426)	(1,178)
Amortized Cost		329,569	314,955
Fixed Maturities | Commercial Mortgage-Backed Securities
Gain (Loss) on Investments [Line Items]
Total investments		140,601	154,139
Gross Unrealized Gains		2,742	2,859
Gross Unrealized Losses		(1,308)	(1,904)
Amortized Cost		139,167	153,184
Fixed Maturities | Mortgage-Backed and Asset-Backed Securities
Gain (Loss) on Investments [Line Items]
Total investments		933,436	976,634
Gross Unrealized Gains		9,180	8,152
Gross Unrealized Losses		(6,059)	(9,722)
Amortized Cost		930,315	978,204
Fixed Maturities | Corporate Exposures
Gain (Loss) on Investments [Line Items]
Total investments	[1]	910,106	838,057
Gross Unrealized Gains	[1]	18,221	10,185
Gross Unrealized Losses	[1]	(1,983)	(5,528)
Amortized Cost	[1]	893,868	833,400
Equity Securities
Gain (Loss) on Investments [Line Items]
Total investments		375,876	349,142
Gross Unrealized Gains		42,597	27,016
Gross Unrealized Losses		(1,460)	(5,785)
Amortized Cost		334,739	327,911
Equity Securities | Common Stocks
Gain (Loss) on Investments [Line Items]
Total investments		180,771	164,087
Gross Unrealized Gains		35,179	24,677
Gross Unrealized Losses		(815)	(964)
Amortized Cost		146,407	140,374
Equity Securities | Preferred Stocks
Gain (Loss) on Investments [Line Items]
Total investments		195,105	185,055
Gross Unrealized Gains		7,418	2,339
Gross Unrealized Losses		(645)	(4,821)
Amortized Cost		188,332	187,537
Short-Term Investments
Gain (Loss) on Investments [Line Items]
Total investments		247,607	143,539
Gross Unrealized Gains		5	88
Amortized Cost		$ 247,602	$ 143,451

[1] Corporate Exposures consist of investments in corporate bonds, hybrid bonds and redeemable preferred stocks.

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Investments - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) Security	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Security	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) Security
Schedule of Investments [Line Items]
Other Invested Assets	$ 1,751		$ 1,751		$ 1,960
Non-credit OTTI on fixed maturities in a net unrealized gain position			500		400
Gross Unrealized Loss	$ 11,590		$ 11,590		$ 30,199
OTTI losses		$ 0
Equity Securities
Schedule of Investments [Line Items]
Number of securities in unrealized loss position | Security	35		35		75
Gross Unrealized Loss	$ 1,460		$ 1,460		$ 5,785
OTTI losses	$ 1,000		$ 2,100
Fixed Maturities
Schedule of Investments [Line Items]
Number of securities in unrealized loss position | Security	317		317		413
Gross Unrealized Loss	$ 10,130		$ 10,130		$ 24,414
OTTI losses				$ 200
Non-government-backed securities | Maximum
Schedule of Investments [Line Items]
Percentage of investment	5.00%		5.00%		5.00%
Gross Unrealized Loss	$ 800		$ 800		$ 1,000
Mortgage-Backed and Asset-Backed Securities
Schedule of Investments [Line Items]
Securities, effective maturities			4 years 10 months 25 days
Mortgage-Backed and Asset-Backed Securities | Fixed Maturities
Schedule of Investments [Line Items]
Gross Unrealized Loss	$ 6,059		$ 6,059		$ 9,722

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Scheduled Maturity Dates for Fixed Maturity Securities by Number of Years Until Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value
Due in one year or less	$ 218,780
Due after one year through five years	708,302
Due after five years through ten years	333,260
Due after ten years	604,407
Mortgage-Backed and Asset-Backed Securities	933,436
Total	2,798,185	$ 2,635,882
Amortized Cost
Due in one year or less	216,537
Due after one year through five years	697,520
Due after five years through ten years	324,180
Due after ten years	583,550
Mortgage-Backed and Asset-Backed Securities	930,315
Total	$ 2,752,102	$ 2,628,225

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Summary of Aggregate Fair Value and Gross Unrealized Loss by Length of Time Securities had Continuously been in Gross Unrealized Loss Position as Well as Number of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	$ 702,989	$ 1,256,887
Less than 12 months Gross Unrealized Losses	(7,244)	(24,493)
Greater than 12 months Fair Value	227,378	127,403
Greater than 12 months Gross Unrealized Losses	(4,346)	(5,706)
Fair Value	930,367	1,384,290
Gross Unrealized Losses	(11,590)	(30,199)
Fixed Maturities
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	655,581	1,111,873
Less than 12 months Gross Unrealized Losses	(5,816)	(19,074)
Greater than 12 months Fair Value	226,624	125,409
Greater than 12 months Gross Unrealized Losses	(4,314)	(5,340)
Fair Value	882,205	1,237,282
Gross Unrealized Losses	(10,130)	(24,414)
Fixed Maturities | U.S. Treasury Bonds, Agency Bonds and Foreign Government Bonds
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	67,562	150,891
Less than 12 months Gross Unrealized Losses	(344)	(2,570)
Greater than 12 months Fair Value	31,928	16,819
Greater than 12 months Gross Unrealized Losses	(263)	(2,558)
Fair Value	99,490	167,710
Gross Unrealized Losses	(607)	(5,128)
Fixed Maturities | States, Municipalities and Political Subdivisions
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	80,570	137,731
Less than 12 months Gross Unrealized Losses	(732)	(3,111)
Greater than 12 months Fair Value	31,125	13,255
Greater than 12 months Gross Unrealized Losses	(749)	(925)
Fair Value	111,695	150,986
Gross Unrealized Losses	(1,481)	(4,036)
Fixed Maturities | Agency Mortgage-Backed Securities
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	237,804	349,119
Less than 12 months Gross Unrealized Losses	(2,846)	(6,155)
Greater than 12 months Fair Value	56,656	12,401
Greater than 12 months Gross Unrealized Losses	(1,452)	(430)
Fair Value	294,460	361,520
Gross Unrealized Losses	(4,298)	(6,585)
Fixed Maturities | Residential Mortgage Backed Securities
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	7,899	953
Less than 12 months Gross Unrealized Losses	(6)	(18)
Greater than 12 months Fair Value	586	926
Greater than 12 months Gross Unrealized Losses	(21)	(37)
Fair Value	8,485	1,879
Gross Unrealized Losses	(27)	(55)
Fixed Maturities | Asset-Backed Securities
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	69,885	95,514
Less than 12 months Gross Unrealized Losses	(379)	(970)
Greater than 12 months Fair Value	4,942	48,093
Greater than 12 months Gross Unrealized Losses	(47)	(208)
Fair Value	74,827	143,607
Gross Unrealized Losses	(426)	(1,178)
Fixed Maturities | Commercial Mortgage-Backed Securities
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	41,572	51,932
Less than 12 months Gross Unrealized Losses	(594)	(1,164)
Greater than 12 months Fair Value	7,924	7,910
Greater than 12 months Gross Unrealized Losses	(714)	(740)
Fair Value	49,496	59,842
Gross Unrealized Losses	(1,308)	(1,904)
Fixed Maturities | Mortgage-Backed and Asset-Backed Securities
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	357,160	497,518
Less than 12 months Gross Unrealized Losses	(3,825)	(8,307)
Greater than 12 months Fair Value	70,108	69,330
Greater than 12 months Gross Unrealized Losses	(2,234)	(1,415)
Fair Value	427,268	566,848
Gross Unrealized Losses	(6,059)	(9,722)
Fixed Maturities | Corporate Exposures
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	150,289	325,733
Less than 12 months Gross Unrealized Losses	(915)	(5,086)
Greater than 12 months Fair Value	93,463	26,005
Greater than 12 months Gross Unrealized Losses	(1,068)	(442)
Fair Value	243,752	351,738
Gross Unrealized Losses	(1,983)	(5,528)
Equity Securities
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	47,408	145,014
Less than 12 months Gross Unrealized Losses	(1,428)	(5,419)
Greater than 12 months Fair Value	754	1,994
Greater than 12 months Gross Unrealized Losses	(32)	(366)
Fair Value	48,162	147,008
Gross Unrealized Losses	(1,460)	(5,785)
Equity Securities | Common Stocks
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	15,633	31,272
Less than 12 months Gross Unrealized Losses	(814)	(634)
Greater than 12 months Fair Value	87	1,471
Greater than 12 months Gross Unrealized Losses	(1)	(330)
Fair Value	15,720	32,743
Gross Unrealized Losses	(815)	(964)
Equity Securities | Preferred Stocks
Gain (Loss) on Investments [Line Items]
Less than 12 months Fair Value	31,775	113,742
Less than 12 months Gross Unrealized Losses	(614)	(4,785)
Greater than 12 months Fair Value	667	523
Greater than 12 months Gross Unrealized Losses	(31)	(36)
Fair Value	32,442	114,265
Gross Unrealized Losses	$ (645)	$ (4,821)

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Summary of Cumulative Amounts Related to Credit Loss Portion of Other-Than-Temporary Impairment Losses on Debt Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments Debt And Equity Securities [Abstract]
Beginning Balance	$ 2,361	$ 2,511	$ 2,361	$ 2,361
Additions for Credit Loss Impairments recognized in the current period on securities not previously impaired	0	0	0	150
Additions for Credit Loss Impairments recognized in the current period on securities previously impaired	0	0	0	0
Reductions for Credit Loss Impairments previously recognized on securities sold during the period	0	(150)	0	(150)
Ending Balance	$ 2,361	$ 2,361	$ 2,361	$ 2,361

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Net Investment Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Investment Income [Line Items]
Investment Income	$ 23,515	$ 20,734	$ 69,018	$ 61,767
Investment Expenses	(917)	(859)	(2,707)	(2,423)
Net Investment Income	22,598	19,875	66,311	59,344
Fixed Maturities
Net Investment Income [Line Items]
Investment Income	19,491	17,124	57,019	50,781
Equity Securities
Net Investment Income [Line Items]
Investment Income	3,774	3,540	11,337	10,418
Short-Term Investments
Net Investment Income [Line Items]
Investment Income	$ 250	$ 70	$ 662	$ 568

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Realized Gains and Losses, Excluding Net Other-Than-Temporary Impairment Losses Recognized in Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Gain (Loss) on Investments [Line Items]
Net Realized Gains (Losses)	$ 5,190	$ 1,586	$ 7,933	$ 5,143
Fixed Maturities
Gain (Loss) on Investments [Line Items]
Gains	2,589	1,356	3,401	5,200
Losses	(900)	(1,221)	(3,114)	(3,086)
Net Realized Gains (Losses)	1,689	135	287	2,114
Short-Term Investments
Gain (Loss) on Investments [Line Items]
Gains	767	128	1,014	803
Losses	(111)	(107)	(371)	(250)
Net Realized Gains (Losses)	656	21	643	553
Equity Securities
Gain (Loss) on Investments [Line Items]
Gains	2,863	1,443	7,249	3,123
Losses	(18)	(13)	(246)	(647)
Net Realized Gains (Losses)	$ 2,845	$ 1,430	$ 7,003	$ 2,476

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Fair Value Measurement - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Significant transfers between Level 1 and Level 2	$ 0	$ 0
Level 3 assets	$ 0
5.75% Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate stated on senior notes	5.75%
Senior notes due date	Oct. 15, 2023

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Fixed Maturities and Equity Securities by Asset Class that are Measured at Fair Value (Detail) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		$ 3,421,668	$ 3,128,563
Total Liabilities Measured at Fair Value		282,073	280,316
Fixed Maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		2,798,185	2,635,882
Fixed Maturities | U.S. Treasury Bonds, Agency Bonds, and Foreign
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		269,851	273,776
Fixed Maturities | States, Municipalities and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		684,792	547,415
Fixed Maturities | Agency Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		426,441	487,364
Fixed Maturities | Residential Mortgage Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		34,748	20,530
Fixed Maturities | Asset-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		331,646	314,601
Fixed Maturities | Commercial Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		140,601	154,139
Fixed Maturities | Mortgage-Backed and Asset-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		933,436	976,634
Fixed Maturities | Corporate Exposures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value	[1]	910,106	838,057
Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		375,876	349,142
Equity Securities | Common Stocks
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		180,771	164,087
Equity Securities | Preferred Stocks
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		195,105	185,055
Short-Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		247,607	143,539
Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, at Fair Value		282,073	280,316
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		479,990	355,330
Total Liabilities Measured at Fair Value		0	0
Level 1 | Fixed Maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		51,612	47,704
Level 1 | Fixed Maturities | U.S. Treasury Bonds, Agency Bonds, and Foreign
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		51,612	47,704
Level 1 | Fixed Maturities | States, Municipalities and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 1 | Fixed Maturities | Agency Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 1 | Fixed Maturities | Residential Mortgage Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 1 | Fixed Maturities | Asset-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 1 | Fixed Maturities | Commercial Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 1 | Fixed Maturities | Mortgage-Backed and Asset-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 1 | Fixed Maturities | Corporate Exposures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 1 | Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		180,771	164,087
Level 1 | Equity Securities | Common Stocks
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		180,771	164,087
Level 1 | Equity Securities | Preferred Stocks
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 1 | Short-Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		247,607	143,539
Level 1 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, at Fair Value		0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		2,941,678	2,773,233
Total Liabilities Measured at Fair Value		282,073	280,316
Level 2 | Fixed Maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		2,746,573	2,588,178
Level 2 | Fixed Maturities | U.S. Treasury Bonds, Agency Bonds, and Foreign
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		218,239	226,072
Level 2 | Fixed Maturities | States, Municipalities and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		684,792	547,415
Level 2 | Fixed Maturities | Agency Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		426,441	487,364
Level 2 | Fixed Maturities | Residential Mortgage Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		34,748	20,530
Level 2 | Fixed Maturities | Asset-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		331,646	314,601
Level 2 | Fixed Maturities | Commercial Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		140,601	154,139
Level 2 | Fixed Maturities | Mortgage-Backed and Asset-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		933,436	976,634
Level 2 | Fixed Maturities | Corporate Exposures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		910,106	838,057
Level 2 | Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		195,105	185,055
Level 2 | Equity Securities | Common Stocks
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 2 | Equity Securities | Preferred Stocks
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		195,105	185,055
Level 2 | Short-Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 2 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, at Fair Value		282,073	280,316
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Total Liabilities Measured at Fair Value		0	0
Level 3 | Fixed Maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Fixed Maturities | U.S. Treasury Bonds, Agency Bonds, and Foreign
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Fixed Maturities | States, Municipalities and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Fixed Maturities | Agency Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Fixed Maturities | Residential Mortgage Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Fixed Maturities | Asset-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Fixed Maturities | Commercial Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Fixed Maturities | Mortgage-Backed and Asset-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Fixed Maturities | Corporate Exposures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Equity Securities | Common Stocks
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Equity Securities | Preferred Stocks
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Short-Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed Maturities and Equity Securities, at Fair Value		0	0
Level 3 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, at Fair Value		$ 0	$ 0

[1] Corporate Exposures consist of investments in corporate bonds, hybrid bonds and redeemable preferred stocks.

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Summary of Reserves for Losses and LAE Activity (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Insurance [Abstract]
Net Reserves for Losses and LAE at Beginning of Year	$ 1,510,451	$ 1,393,126
Provision for Losses and LAE for Claims Occurring in the Current Year	578,272	504,599
Increase (Decrease) in Estimated Losses and LAE for Claims Occurring in Prior Years	44,609	(11,644)
Incurred Losses and LAE	622,881	492,955
Losses and LAE Paid for Claims Occurring During:
Current Year	(75,707)	(72,897)
Prior Years	(358,684)	(323,761)
Losses and LAE Payments	(434,391)	(396,658)
Foreign Currency Adjustment	11,688	(9,213)
Net Reserves for Losses and LAE at End of Period	1,710,629	1,480,210
Reinsurance Recoverables on Unpaid Losses and LAE	847,505	787,917	$ 779,276
Gross Reserves for Losses and LAE at End of Period	$ 2,558,134	$ 2,268,127	$ 2,289,727

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Loss Reserves - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) Segment	Sep. 30, 2016 USD ($)
Causes Of Increase Decrease In Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]
Increase in incurred losses and LAE	$ 129,900
Provision for Losses and LAE for Claims Occurring in the Current Year	578,272	$ 504,599
Net prior accident year reserve strengthening	$ 44,609	$ (11,644)
Number of reportable segments | Segment	3
Increase in losses and loss adjustment expense payments	$ 37,700
Maria
Causes Of Increase Decrease In Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]
Provision for Losses and LAE for Claims Occurring in the Current Year	26,400
Irma
Causes Of Increase Decrease In Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]
Provision for Losses and LAE for Claims Occurring in the Current Year	25,800
Harvey
Causes Of Increase Decrease In Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]
Provision for Losses and LAE for Claims Occurring in the Current Year	17,100
Puebla, Mexico Earthquake
Causes Of Increase Decrease In Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]
Provision for Losses and LAE for Claims Occurring in the Current Year	$ 3,500

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Lists of 10 Largest Reinsurers Measured by Reinsurance Recoverable (Detail) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017	Dec. 31, 2016
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 231,174	$ 213,377
Reinsurance Recoverables Paid/Unpaid Losses	[1]	908,559
Reinsurance Recoverables Total		1,139,733
Collateral Held		171,616
Everest Reinsurance Company | AM Best, A+ Rating | Standard & Poor's, A+ Rating
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		28,539
Reinsurance Recoverables Paid/Unpaid Losses	[1]	87,285
Reinsurance Recoverables Total		115,824
Collateral Held		$ 11,731
Everest Reinsurance Company | AM Best, A+ Rating | AM Best | Standard & Poor's, A+ Rating
Ceded Credit Risk [Line Items]
Rating		A+
Everest Reinsurance Company | AM Best, A+ Rating | Standard & Poor's | Standard & Poor's, A+ Rating
Ceded Credit Risk [Line Items]
Rating		A+
Swiss Reinsurance America Corporation | AM Best, A+ Rating | Standard & Poor's, AA- Rating
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 23,116
Reinsurance Recoverables Paid/Unpaid Losses	[1]	73,548
Reinsurance Recoverables Total		96,664
Collateral Held		$ 7,088
Swiss Reinsurance America Corporation | AM Best, A+ Rating | AM Best | Standard & Poor's, AA- Rating
Ceded Credit Risk [Line Items]
Rating		A+
Swiss Reinsurance America Corporation | AM Best, A+ Rating | Standard & Poor's | Standard & Poor's, AA- Rating
Ceded Credit Risk [Line Items]
Rating		AA-
National Indemnity Company | AM Best, A++ Rating | Standard & Poor's, AA+ Rating
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 6,363
Reinsurance Recoverables Paid/Unpaid Losses	[1]	68,539
Reinsurance Recoverables Total		74,902
Collateral Held		$ 6,482
National Indemnity Company | AM Best, A++ Rating | AM Best | Standard & Poor's, AA+ Rating
Ceded Credit Risk [Line Items]
Rating		A++
National Indemnity Company | AM Best, A++ Rating | Standard & Poor's | Standard & Poor's, AA+ Rating
Ceded Credit Risk [Line Items]
Rating		AA+
Transatlantic Reinsurance Company | AM Best, A+ Rating | Standard & Poor's, A+ Rating
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 8,522
Reinsurance Recoverables Paid/Unpaid Losses	[1]	52,237
Reinsurance Recoverables Total		60,759
Collateral Held		$ 2,543
Transatlantic Reinsurance Company | AM Best, A+ Rating | AM Best | Standard & Poor's, A+ Rating
Ceded Credit Risk [Line Items]
Rating		A+
Transatlantic Reinsurance Company | AM Best, A+ Rating | Standard & Poor's | Standard & Poor's, A+ Rating
Ceded Credit Risk [Line Items]
Rating		A+
Munich Reinsurance America Inc | AM Best, A+ Rating | Standard & Poor's, AA- Rating
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 11,094
Reinsurance Recoverables Paid/Unpaid Losses	[1]	46,158
Reinsurance Recoverables Total		57,252
Collateral Held		$ 4,898
Munich Reinsurance America Inc | AM Best, A+ Rating | AM Best | Standard & Poor's, AA- Rating
Ceded Credit Risk [Line Items]
Rating		A+
Munich Reinsurance America Inc | AM Best, A+ Rating | Standard & Poor's | Standard & Poor's, AA- Rating
Ceded Credit Risk [Line Items]
Rating		AA-
Aspen Insurance UK Ltd. | AM Best, A Rating | Standard & Poor's, A Rating
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 10,050
Reinsurance Recoverables Paid/Unpaid Losses	[1]	29,700
Reinsurance Recoverables Total		39,750
Collateral Held		$ 8,057
Aspen Insurance UK Ltd. | AM Best, A Rating | AM Best | Standard & Poor's, A Rating
Ceded Credit Risk [Line Items]
Rating		A
Aspen Insurance UK Ltd. | AM Best, A Rating | Standard & Poor's | Standard & Poor's, A Rating
Ceded Credit Risk [Line Items]
Rating		A
Employers Mutual Casualty Company | AM Best, A Rating | Standard & Poor's, Not Rated
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 10,623
Reinsurance Recoverables Paid/Unpaid Losses	[1]	27,670
Reinsurance Recoverables Total		38,293
Collateral Held		$ 11,100
Employers Mutual Casualty Company | AM Best, A Rating | AM Best | Standard & Poor's, Not Rated
Ceded Credit Risk [Line Items]
Rating		A
Employers Mutual Casualty Company | AM Best, A Rating | Standard & Poor's | Standard & Poor's, Not Rated
Ceded Credit Risk [Line Items]
Rating		NR
Allied World Reinsurance | AM Best, A Rating | Standard & Poor's, A- Rating
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 6,531
Reinsurance Recoverables Paid/Unpaid Losses	[1]	31,684
Reinsurance Recoverables Total		38,215
Collateral Held		$ 1,937
Allied World Reinsurance | AM Best, A Rating | AM Best | Standard & Poor's, A- Rating
Ceded Credit Risk [Line Items]
Rating		A
Allied World Reinsurance | AM Best, A Rating | Standard & Poor's | Standard & Poor's, A- Rating
Ceded Credit Risk [Line Items]
Rating		A-
Partner Reinsurance Europe | AM Best, A Rating | Standard & Poor's, A+ Rating
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 5,699
Reinsurance Recoverables Paid/Unpaid Losses	[1]	28,532
Reinsurance Recoverables Total		34,231
Collateral Held		$ 11,095
Partner Reinsurance Europe | AM Best, A Rating | AM Best | Standard & Poor's, A+ Rating
Ceded Credit Risk [Line Items]
Rating		A
Partner Reinsurance Europe | AM Best, A Rating | Standard & Poor's | Standard & Poor's, A+ Rating
Ceded Credit Risk [Line Items]
Rating		A+
Ace Property and Casualty Insurance Company | AM Best, A++ Rating | Standard & Poor's, AA Rating
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 6,720
Reinsurance Recoverables Paid/Unpaid Losses	[1]	23,288
Reinsurance Recoverables Total		30,008
Collateral Held		$ 1,556
Ace Property and Casualty Insurance Company | AM Best, A++ Rating | AM Best | Standard & Poor's, AA Rating
Ceded Credit Risk [Line Items]
Rating		A++
Ace Property and Casualty Insurance Company | AM Best, A++ Rating | Standard & Poor's | Standard & Poor's, AA Rating
Ceded Credit Risk [Line Items]
Rating		AA
Top 10 Reinsurers
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		$ 117,257
Reinsurance Recoverables Paid/Unpaid Losses	[1]	468,641
Reinsurance Recoverables Total		585,898
Collateral Held		66,487
Others
Ceded Credit Risk [Line Items]
Reinsurance Recoverables Unearned Premium		113,917
Reinsurance Recoverables Paid/Unpaid Losses	[1]	439,918
Reinsurance Recoverables Total		553,835
Collateral Held		$ 105,129

[1] Net of reserve for uncollectable reinsurance of approximately $12.4 million.

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Lists of 10 Largest Reinsurers Measured by Reinsurance Recoverable (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Insurance [Abstract]
Reserve for uncollectible reinsurance amount	$ 12.4	$ 12.1

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Ceded Reinsurance - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Effects Of Reinsurance [Line Items]
Reserve for uncollectible reinsurance amount	$ 12,400	$ 12,100
Collateral held	171,616
Ceded Balances Payable
Effects Of Reinsurance [Line Items]
Collateral held	129,300
Letter of Credit
Effects Of Reinsurance [Line Items]
Collateral held	39,700
Trust Account Balances
Effects Of Reinsurance [Line Items]
Collateral held	$ 2,600

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Summary of Components of Net Losses and Loss Adjustment Expenses Incurred (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Insurance [Abstract]
Direct			$ 747,759	$ 586,100
Assumed			124,730	69,657
Ceded			(249,608)	(162,802)
Net losses and LAE	$ 276,171	$ 172,793	$ 622,881	$ 492,955

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2013	Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Incentive awarded to the company by the State of Connecticut, total		$ 9.9	$ 11.5
Incentive awarded to the company by the State of Connecticut, non-interest bearing loans		7.5	8.0
Incentive awarded to the company by the State of Connecticut, grants		$ 2.4	$ 3.5
Non-interest bearing incentive loan term		10 years
Forgiveness awarded to the company by the state of Connecticut		$ 7.0
Incentive awarded to the company by the State of Connecticut, revenue recognized	$ 0.4	0.9
Incentive awarded to the company by the State of Connecticut, deferred revenue	$ 4.8	$ 4.8		$ 4.8

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Stock-Based Compensation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Non-Performance Based Grants | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, award vesting period	3 years
Non-Performance Based Grants | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, award vesting period	4 years
Performance Based Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, award vesting period	3 years
Stock incentive Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive units granted | shares	279,630
Stock incentive unit, weighted average grant price | $ / shares	$ 55.74

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Stockholders Equity - Additional Information (Detail) - $ / shares		9 Months Ended
	Sep. 14, 2017	Sep. 30, 2017
Equity [Abstract]
Common stock dividend paid per share	$ 0.06
Dividend payable record date		Aug. 24, 2017

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Subsequent Events - Additional Information (Detail) - $ / shares		3 Months Ended		9 Months Ended
	Nov. 02, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Subsequent Event [Line Items]
Cash Dividends Declared per Common Share		$ 0.06	$ 0.045	$ 0.165	$ 0.09
Dividend payable record date				Aug. 24, 2017
Subsequent Event
Subsequent Event [Line Items]
Dividend declaration date	Nov. 02, 2017
Cash Dividends Declared per Common Share	$ 0.06
Dividend payable date	Dec. 15, 2017
Dividend payable record date	Nov. 24, 2017