Endurance Specialty (ENH) 10-Q 8 Aug 16 2016 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Aug. 04, 2016
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Entity Registrant Name	Endurance Specialty Holdings Ltd.
Entity Central Index Key	1,179,755
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		67,579,012

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Fixed maturity investments, trading at fair value (amortized cost: $2,108,611 and $1,611,079 at June 30, 2016 and December 31, 2015, respectively)	$ 2,126,600	$ 1,587,160
Fixed maturity investments, available for sale at fair value (amortized cost: $3,820,234 and $4,361,997 at June 30, 2016 and December 31, 2015, respectively)	3,892,479	4,359,019
Short-term investments, trading at fair value (amortized cost: $295,425 and $394,096 at June 30, 2016 and December 31, 2015, respectively)	295,442	394,111
Short-term investments, available for sale at fair value (amortized cost: $18,846 and $25,657 at June 30, 2016 and December 31, 2015, respectively)	18,849	25,685
Equity securities, trading at fair value (cost: $36,427 and $15,290 at June 30, 2016 and December 31, 2015, respectively)	36,332	15,229
Equity securities, available for sale at fair value (cost: $496,779 and $542,429 at June 30, 2016 and December 31, 2015, respectively)	506,010	513,585
Other investments	779,810	872,617
Total investments	7,655,522	7,767,406
Cash and cash equivalents	1,092,977	1,177,750
Premiums receivable, net	2,291,117	1,376,328
Insurance and reinsurance balances receivable	129,861	102,403
Deferred acquisition costs	363,406	255,501
Prepaid reinsurance premiums	885,892	498,574
Reinsurance recoverable on unpaid losses	1,105,617	907,944
Reinsurance recoverable on paid losses	348,219	288,026
Accrued investment income	30,299	30,213
Goodwill and intangible assets	511,649	553,960
Deferred tax asset	52,722	64,164
Net receivable on sales of investments	89,144	31,873
Other assets	275,242	187,383
Total assets	14,831,667	13,241,525
LIABILITIES
Reserve for losses and loss expenses	4,727,997	4,510,415
Reserve for unearned premiums	2,670,607	1,789,148
Deposit liabilities	12,573	13,674
Reinsurance balances payable	1,066,197	661,213
Debt	705,261	717,650
Net payable on purchases of investments	192,793	63,442
Deferred tax liability	15,817	17,315
Other liabilities	335,933	344,596
Total liabilities	9,727,178	8,117,453
Commitments and contingent liabilities
SHAREHOLDERS' EQUITY
Preferred shares, total liquidation preference $230,000 (2015 - $460,000)	9	9,209
Common shares, ordinary - 67,565,483 issued and outstanding (2015 - 66,797,991)	67,565	66,798
Additional paid-in capital	1,944,381	2,145,836
Accumulated other comprehensive income (loss)	19,949	(46,634)
Retained earnings	2,812,734	2,681,053
Total shareholders' equity available to Endurance Holdings	4,844,638	4,856,262
Non-controlling interests	259,851	267,810
Total shareholders' equity	5,104,489	5,124,072
Total liabilities and shareholders' equity	$ 14,831,667	$ 13,241,525

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investments [Abstract]
Fixed maturity investments, trading, amortized cost	$ 2,108,611	$ 1,611,079
Fixed maturity investments, available for sale, amortized cost	3,820,234	4,361,997
Short-term investments, trading, amortized cost	295,425	394,096
Short-term investments, available for sale, amortized cost	18,846	25,657
Equity securities, trading, cost	36,427	15,290
Equity securities, available for sale, cost	496,779	542,429
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, aggregate liquidation preference	$ 230,000	$ 460,000
Common stock, shares issued	67,565,483	66,797,991
Common stock, shares outstanding	67,565,483	66,797,991

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements Of Income And Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Gross premiums written	$ 1,136,930	$ 861,184	$ 2,748,607	$ 2,162,616
Ceded premiums written	(419,162)	(302,101)	(1,091,997)	(838,579)
Net premiums written	717,768	559,083	1,656,610	1,324,037
Change in unearned premiums	(118,160)	(100,948)	(503,811)	(476,043)
Net premiums earned	599,608	458,135	1,152,799	847,994
Net investment income	43,977	32,252	55,158	74,113
Net realized and unrealized gains	6,347	9,680	20,134	27,869
Net impairment losses recognized in earnings	(9,841)	(424)	(10,464)	(1,073)
Other underwriting income (loss)	930	1,389	(1,514)	3,795
Total revenues	641,021	501,032	1,216,113	952,698
Expenses
Net losses and loss expenses	376,112	239,122	619,440	411,058
Acquisition expenses	111,961	84,971	215,803	167,064
General and administrative expenses	55,079	54,965	127,304	109,855
Corporate expenses	11,830	12,634	23,601	24,902
Amortization of intangibles	20,943	1,579	42,317	3,178
Net foreign exchange (gains) losses	(32,751)	12,981	(44,480)	20,533
Interest expense	11,357	9,062	22,227	18,121
Total expenses	554,531	415,314	1,006,212	754,711
Income before income taxes	86,490	85,718	209,901	197,987
Income tax benefit (expense)	1,138	(1,512)	2,371	(5,302)
Net income	87,628	84,206	212,272	192,685
Net income attributable to non-controlling interests	(3,714)	0	(12,777)	0
Net income available to Endurance Holdings	83,914	84,206	199,495	192,685
Preferred dividends	(7,293)	(8,188)	(16,496)	(16,376)
Net income available to Endurance Holdings' common and participating common shareholders	76,621	76,018	182,999	176,309
Comprehensive income
Net income	87,628	84,206	212,272	192,685
Other comprehensive income (loss)
Net unrealized holding gains (losses) on investments arising during the period (net of other-than-temporary impairment losses recognized in other comprehensive income (loss), reclassification adjustment and applicable deferred income taxes of ($19,709) and $2,825 for the six months ended June 30, 2016 and 2015, respectively)	58,837	(66,979)	116,595	(42,490)
Foreign currency translation adjustments	(37,738)	26,163	(50,056)	2,705
Reclassification adjustment for net losses on derivative designated as cash flow hedge included in net income	22	22	44	44
Other comprehensive income (loss)	21,121	(40,794)	66,583	(39,741)
Comprehensive income	108,749	43,412	278,855	152,944
Comprehensive income attributable to non-controlling interests	(3,714)	0	(12,777)	0
Comprehensive income attributable to Endurance Holdings	$ 105,035	$ 43,412	$ 266,078	$ 152,944
Per share data
Basic earnings per common share	$ 1.14	$ 1.69	$ 2.72	$ 3.92
Diluted earnings per common share	1.14	1.68	2.72	3.91
Dividend per common share	$ 0.38	$ 0.35	$ 0.76	$ 0.70

Unaudited Condensed Consolidat5

Unaudited Condensed Consolidated Statements Of Income And Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Other comprehensive income (loss), net unrealized holding gains on investments arising during the period, tax	$ (19,709)	$ 2,825

Unaudited Condensed Consolidat6

Unaudited Condensed Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Cumulative Foreign Currency Translation Adjustments [Member]	Unrealized Holding Gains (Losses) On Investments, Net Of Deferred Taxes [Member]	Accumulated Derivative Loss On Cash Flow Hedging Instruments [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]
Balance, beginning of period at Dec. 31, 2014		$ 17,200	$ 44,765	$ 598,226	$ (7,628)	$ 86,100	$ (1,766)		$ 2,448,285
Redemption of Series B, non-cumulative preferred shares		0		0
Issuance of common shares, net of forfeitures			392	569
Settlement of equity awards				(6,092)
Stock-based compensation expense				17,882
Foreign currency translation adjustments	$ 2,705				2,705
Net unrealized holding gains (losses) arising during the period, net of other-than-temporary impairment losses and reclassification adjustment	(42,490)					(42,490)
Net change from current period hedging transactions, net of reclassification adjustment							44
Net income	192,685								192,685
Net income attributable to non-controlling interests	0								0
Dividends on preferred shares	(16,376)								(16,376)
Dividends on common shares									(31,595)
Balance, end of period at Jun. 30, 2015	3,302,906	17,200	45,157	610,585	(4,923)	43,610	(1,722)	$ 36,965	2,592,999
Non-controlling interests	0
Total shareholders' equity	3,302,906
Non-controlling interests	267,810
Total shareholders' equity	5,124,072
Balance, beginning of period at Dec. 31, 2015	4,856,262	9,209	66,798	2,145,836	(32,318)	(12,638)	(1,678)		2,681,053
Redemption of Series B, non-cumulative preferred shares		(9,200)		(219,741)
Issuance of common shares, net of forfeitures			767	9,411
Settlement of equity awards				(10,818)
Stock-based compensation expense				19,693
Foreign currency translation adjustments	(50,056)				(50,056)
Net unrealized holding gains (losses) arising during the period, net of other-than-temporary impairment losses and reclassification adjustment	116,595					116,595
Net change from current period hedging transactions, net of reclassification adjustment							44
Net income	212,272								212,272
Net income attributable to non-controlling interests	12,777								(12,777)
Dividends on preferred shares	(16,496)								(16,496)
Dividends on common shares									(51,318)
Balance, end of period at Jun. 30, 2016	4,844,638	9	67,565	1,944,381	(82,374)	103,957	(1,634)	19,949	2,812,734
Non-controlling interests	258,259
Foreign currency translation adjustments	(37,738)
Net unrealized holding gains (losses) arising during the period, net of other-than-temporary impairment losses and reclassification adjustment	58,837
Net income	87,628
Net income attributable to non-controlling interests	3,714
Dividends on preferred shares	(7,293)
Balance, end of period at Jun. 30, 2016	4,844,638	$ 9	$ 67,565	$ 1,944,381	$ (82,374)	$ 103,957	$ (1,634)	$ 19,949	$ 2,812,734
Non-controlling interests	259,851
Total shareholders' equity	$ 5,104,489

Unaudited Condensed Consolidat7

Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows provided by operating activities
Net income	$ 212,272	$ 192,685
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of net premium on investments	19,545	23,090
Amortization of other intangibles and depreciation	53,005	12,695
Net realized and unrealized gains	(20,134)	(27,869)
Net impairment losses recognized in earnings	10,464	1,073
Deferred taxes	(9,765)	5,041
Stock-based compensation expense	19,693	17,882
Equity in earnings of other investments	23,005	(15,958)
Premiums receivable, net	(914,789)	(782,540)
Insurance and reinsurance balances receivable	(27,458)	14,052
Deferred acquisition costs	(107,905)	(89,200)
Prepaid reinsurance premiums	(387,318)	(314,024)
Reinsurance recoverable on unpaid losses	(197,673)	(114,677)
Reinsurance recoverable on paid losses	(60,193)	61,004
Accrued investment income	(86)	2,065
Other assets	(6,802)	3,700
Reserve for losses and loss expenses	217,582	(13,334)
Reserve for unearned premiums	881,459	792,414
Deposit liabilities	(1,101)	(1,760)
Reinsurance balances payable	404,984	256,746
Other liabilities	(74,268)	404
Net cash flows provided by operating activities	34,517	23,489
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of trading investments	1,278,954	0
Proceeds from sales and maturities of available for sale investments	2,538,205	2,796,678
Proceeds from the redemption of other investments	111,174	36,523
Purchases of trading investments	(1,657,682)	0
Purchases of available for sale investments	(1,977,827)	(2,833,981)
Purchases of other investments	(43,461)	(102,979)
Net settlements of other assets and other liabilities	(35,480)	31,881
Purchases of fixed assets	(5,741)	(15,048)
Net cash paid upon subsidiary acquisition	(6)	(68)
Net cash flows provided by (used in) investing activities	208,136	(86,994)
Cash flows used in financing activities
Issuance of common shares	8,934	817
Redemption of Series B, non-cumulative preferred shares	(230,000)	0
Net distributions to non-controlling interests	(18,980)	0
Settlement of equity awards	(10,818)	(6,092)
Offering and registration costs paid	(318)	0
Proceeds from issuance of debt	537	728
Repayments of debt	(13,407)	(435)
Dividends on preferred shares	(16,496)	(16,376)
Dividends on common shares	(51,261)	(31,543)
Net cash flows used in financing activities	(331,809)	(52,901)
Effect of exchange rate changes on cash and cash equivalents	4,383	(6,424)
Net decrease in cash and cash equivalents	(84,773)	(122,830)
Cash and cash equivalents, beginning of period	1,177,750	745,472
Cash and cash equivalents, end of period	$ 1,092,977	$ 622,642

General

General	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	1. General Endurance Specialty Holdings Ltd. ("Endurance Holdings" and together with its subsidiaries, the "Company") was organized as a Bermuda holding company on June 27, 2002. Endurance Holdings writes specialty lines of insurance and reinsurance on a global basis through its wholly-owned operating subsidiaries. In addition, as part of its collateralized reinsurance and third party asset management operations, Endurance Holdings and Endurance Specialty Insurance Ltd. ("Endurance Bermuda") together own 33.3% of Blue Capital Reinsurance Holdings Ltd. ("BCRH"), and Endurance Bermuda owns 25.2% of Blue Capital Global Reinsurance Fund Limited ("BCGR"). BCRH is a Bermuda-based exempted limited liability holding company managed by Blue Capital Management Ltd. ("BCML"), a wholly-owned subsidiary of the Company. BCRH provides fully-collateralized property catastrophe reinsurance and invests in various insurance-linked securities through its wholly-owned Bermuda-based subsidiaries, Blue Capital Re. Ltd. ("Blue Capital Re") and Blue Capital Re ILS Ltd. ("Blue Capital Re ILS"). BCRH's shares are listed on the New York Stock Exchange and the Bermuda Stock Exchange. BCGR is a closed-ended mutual fund incorporated in Bermuda and managed by BCML. BCGR serves as the feeder fund for the Blue Capital Global Reinsurance SA-I cell (the "BCGR Cell"). BCGR's shares are listed on the Specialist Fund Market of the London Stock Exchange and on the Bermuda Stock Exchange.

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	2. Summary of significant accounting policies The accompanying consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States ("U.S. GAAP") for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Results for the three and six months ended June 30, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 . The consolidated financial statements include the accounts of Endurance Holdings, its wholly-owned subsidiaries, and BCRH and the BCGR Cell. All intercompany transactions and balances have been eliminated in consolidation. Management is required to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying disclosures. Actual results could differ from those estimates. Among other matters, significant estimates and assumptions are used to record premiums written and ceded, to record the fair value of investments and to record reserves for losses and loss expenses and contingencies. Estimates and assumptions are periodically reviewed and the effects of revisions are recorded in the consolidated financial statements in the period that they are determined to be necessary. The balance sheet at December 31, 2015 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements. These consolidated financial statements and notes thereto should be read in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2015 contained in Endurance Holdings' Annual Report on Form 10-K for the fiscal year ended December 31, 2015 (the " 2015 Form 10-K"). Certain comparative information has been reclassified to conform to current year presentation. There were no material changes in the Company's significant accounting and reporting policies subsequent to the filing of the 2015 Form 10-K. In February 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-02, "Amendments to the Consolidation Analysis" ("ASU 2015-02"). Under ASU 2015-02, all legal entities are required to evaluate whether they should consolidate certain legal entities. ASU 2015-02 set forth amendments: (1) modifying the evaluation of whether limited partnerships and similar legal entities are variable interest entities ("VIEs") or voting interest entities; (2) eliminating the presumption that a general partner should consolidate a limited partnership; (3) affecting the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships; and (4) providing a scope exception from consolidation guidance for certain reporting entities. ASU 2015-02 became effective for public business entities for annual and interim periods beginning after December 15, 2015. Early adoption was permitted. The Company adopted ASU 2015-02 effective January 1, 2016 and it did not have a material impact on the Company's Unaudited Condensed Consolidated Financial Statements. 2. Summary of significant accounting policies, cont'd. In September 2015, the FASB issued ASU 2015-16, "Simplifying the Accounting for Measurement-Period Adjustments" ("ASU 2015-16"). ASU 2015-16 eliminates the requirement that an acquirer in a business combination account for measurement-period adjustments retrospectively. Instead, an acquirer will recognize a measurement-period adjustment during the period in which it determines the amount of the adjustment. ASU 2015-16 became effective for public business entities in interim and annual periods beginning after December 15, 2015. Early adoption was permitted. The Company adopted ASU 2015-16 effective January 1, 2016 and it did not have a material impact on the Company's Unaudited Condensed Consolidated Financial Statements. In January 2016, the FASB issued ASU 2016-01, "Financial Instruments - Overall, Recognition and Measurement of Financial Assets and Financial Liabilities" ("ASU 2016-01"). ASU 2016-01 requires entities to measure certain equity investments at fair value and recognize any changes in fair value in net income unless the investments qualify for a practicability exception. For financial liabilities measured using the fair value option, entities will need to present any change in fair value caused by a change in instrument-specific credit risk separately in other comprehensive income. ASU 2016-01 also changes certain disclosure requirements and other aspects of current U.S. GAAP. ASU 2016-01 is effective for public business entities for annual and interim periods beginning after December 15, 2017. Early adoption is not permitted, except for certain provisions. ASU 2016-01 should be applied by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. The amendments related to equity securities without readily determinable fair values (including disclosure requirements) should be applied prospectively. The Company is currently evaluating the impact of this guidance on its Unaudited Condensed Consolidated Financial Statements. In February 2016, the FASB issued ASU 2016-02, "Leases" ("ASU 2016-02"). The objective of ASU 2016-02 is to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. ASU 2016-02 must be applied using a modified retrospective approach. The Company is currently evaluating the impact of this guidance on its Unaudited Condensed Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting" ("ASU 2016-09"). ASU 2016-09 will change how companies account for certain aspects of share-based payments to employees. Entities will be required to recognize the income tax effects of awards in the income statement when the awards vest or are settled. The guidance also changes employers' accounting for an employee's use of shares to satisfy the employer's statutory income tax withholding obligation, and accounting for forfeitures. ASU 2016-09 is effective for public business entities for annual and interim periods beginning after December 15, 2016. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on its Unaudited Condensed Consolidated Financial Statements. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses - Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"). ASU 2016-13 will change how companies measure credit losses for most financial assets and certain other instruments that aren't measured at fair value through net income. The standard will replace today's "incurred loss" approach with an "expected loss" model for instruments measured at amortized cost and require entities to record allowances for available-for-sale debt securities rather than reduce the carrying amount, as they do today under the other-than-temporary impairment model. ASU 2016-13 is effective for public business entities for annual and interim periods beginning after December 15, 2019. Early adoption is permitted for all entities for annual periods beginning after December 15, 2018, and interim periods therein. The Company is currently evaluating the impact of this guidance on its Unaudited Condensed Consolidated Financial Statements.

Investments

Investments	6 Months Ended
	Jun. 30, 2016
Investments [Abstract]
Investments	3. Investments Net Investment Income The components of net investment income for the three and six months ended June 30, 2016 and 2015 are as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Fixed income investments $ 38,904 $ 29,689 $ 77,304 $ 59,941 Equity investments 3,001 1,771 6,848 3,452 Other investments 5,252 3,570 (23,005 ) 15,958 Cash and cash equivalents 604 679 1,651 1,593 47,761 35,709 $ 62,798 $ 80,944 Investment expenses (3,784 ) (3,457 ) (7,640 ) (6,831 ) Net investment income $ 43,977 $ 32,252 $ 55,158 $ 74,113 Contractual maturities of the Company's fixed maturity and short-term investments are shown below as of June 30, 2016 and December 31, 2015 . Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2016 December 31, 2015 Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 540,959 $ 541,461 $ 622,070 $ 622,248 Due after one year through five years 1,907,495 1,936,574 2,005,456 1,995,502 Due after five years through ten years 727,906 747,343 683,147 676,932 Due after ten years 44,651 47,923 33,168 34,651 Residential mortgage-backed securities 1,343,837 1,376,822 1,301,083 1,311,373 Commercial mortgage-backed securities 789,314 800,960 817,570 812,886 Collateralized loan and debt obligations 405,438 397,042 419,795 405,128 Asset-backed securities 483,516 485,245 510,540 507,255 Total $ 6,243,116 $ 6,333,370 $ 6,392,829 $ 6,365,975 3. Investments, cont'd. The following table summarizes the fair value of the fixed maturity investments, short-term investments and equity securities classified as trading at June 30, 2016 and December 31, 2015 : June 30, 2016 December 31, 2015 Fixed maturity investments U.S. government and agencies securities $ 379,470 $ 319,674 U.S. state and municipal securities 5,233 5,559 Foreign government securities 105,014 49,861 Government guaranteed corporate securities 35,410 38,201 Corporate securities 817,194 532,192 Residential mortgage-backed securities 329,982 258,574 Commercial mortgage-backed securities 171,128 127,124 Collateralized loan and debt obligations (1) 91,024 103,219 Asset-backed securities 192,145 152,756 Total fixed maturity investments 2,126,600 1,587,160 Short-term investments 295,442 394,111 Total fixed income investments $ 2,422,042 $ 1,981,271 Equity securities Equity investments $ 42 $ 48 Preferred equity investments 5,715 553 Short-term fixed income fund 30,575 14,628 Total equity securities $ 36,332 $ 15,229 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $17.0 million and $38.5 million at June 30, 2016 and December 31, 2015 , respectively. In addition to the Company's fixed maturity, short-term and equity securities, the Company invests in alternative funds and specialty funds. The Company's alternative funds and specialty funds are recorded on the Company's balance sheet as "other investments." At June 30, 2016 and December 31, 2015 , the Company had invested, net of capital returned, a total of $687.6 million and $737.1 million , respectively, in other investments. At June 30, 2016 and December 31, 2015 , the carrying value of other investments was $779.8 million and $872.6 million , respectively. 3. Investments, cont'd. The following table summarizes the composition, unfunded commitments and redemption restrictions of other investments as of June 30, 2016 and December 31, 2015 : June 30, 2016 Market Value Unfunded Commitments Ineligible for Redemption over next 12 months Alternative funds Hedge funds $ 600,016 $ — $ 43,304 Private investment funds 78,168 98,450 78,168 Other investment funds 29,256 — 29,282 Total alternative funds 707,440 98,450 150,754 Specialty funds High yield loan funds 72,370 — — Total specialty funds 72,370 — — Total other investments $ 779,810 $ 98,450 $ 150,754 December 31, 2015 Market Value Unfunded Ineligible for Alternative funds Hedge funds $ 704,966 $ — $ 57,876 Private investment funds 80,690 102,070 80,690 Other investment funds 23,465 — 24,958 Total alternative funds 809,121 102,070 163,524 Specialty funds High yield loan funds 63,496 30,000 — Total specialty funds 63,496 30,000 — Total other investments $ 872,617 $ 132,070 $ 163,524 Hedge funds – The redemption frequency of the hedge funds in which the Company invests range from monthly to biennially with notice periods from 30 to 180 days. Over one year, it is estimated that the Company can liquidate approximately 92.8% of its hedge fund portfolio, with the remainder over the following two years. Private investment funds – The Company generally has no right to redeem its interest in any private investment funds in advance of dissolution of the applicable partnership. Instead, the nature of these investments is that distributions are received by the Company in connection with the liquidation of or distribution of earnings from the underlying assets of the applicable limited partnership. It is estimated that the majority of the underlying assets of the limited partnerships would liquidate over 5 to 10 years from inception of the limited partnership. A secondary market, with unpredictable liquidity, exists for limited partner interests in private equity funds. Other investment funds – Other investment funds includes funds on deposit with Lloyd's of London ("Lloyd's"), which are restricted, and the Company's investment in BCGR, which represents the net asset or liability of the Company's investment in BCGR that has not been deployed into the BCGR cell. High yield loan funds – There are generally no restrictions on the Company's right to redeem its interest in high yield loan funds with the exception of certain redemption frequency and notice requirements. The redemption frequency of these funds is monthly with notice periods from 30 to 60 days. 3. Investments, cont'd. Net Realized and Unrealized Gains Realized gains and losses are recognized in earnings using the first in, first out method. The analysis of gross realized gains and losses, net unrealized gains on trading securities, and the change in the fair value of investment-related derivative financial instruments for the three and six months ended June 30, 2016 and 2015 is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Gross realized gains on investment sales $ 14,848 $ 14,647 $ 24,704 $ 37,313 Gross realized losses on investment sales (35,977 ) (5,058 ) (47,172 ) (9,954 ) Net unrealized gains on trading securities 27,280 — 42,076 — Change in fair value of investment-related derivative financial instruments (1) 196 91 526 510 Net realized and unrealized gains $ 6,347 $ 9,680 $ 20,134 $ 27,869 (1) For additional information on the Company's derivative financial instruments, see Note 7, Derivatives. Unrealized Gains and Losses The Company classifies some of its investments in fixed maturity investments, short-term investments and equity securities as available for sale. The amortized cost, fair value and related gross unrealized gains and losses on the Company's securities classified as available for sale at June 30, 2016 and December 31, 2015 are as follows: June 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity investments U.S. government and agencies securities $ 342,507 $ 10,889 $ (13 ) $ 353,383 U.S. state and municipal securities 21,744 492 (84 ) 22,152 Foreign government securities 86,698 2,221 — 88,919 Government guaranteed corporate securities 11,682 365 — 12,047 Corporate securities 1,115,782 25,033 (627 ) 1,140,188 Residential mortgage-backed securities 1,018,452 29,280 (892 ) 1,046,840 Commercial mortgage-backed securities 621,501 12,568 (4,237 ) 629,832 Collateralized loan and debt obligations (1) 309,571 754 (4,307 ) 306,018 Asset-backed securities 292,297 1,892 (1,089 ) 293,100 Total fixed maturity investments 3,820,234 83,494 (11,249 ) 3,892,479 Short-term investments 18,846 3 — 18,849 Total fixed income investments $ 3,839,080 $ 83,497 $ (11,249 ) $ 3,911,328 Equity securities Equity investments $ 358,911 $ 10,842 $ (5,024 ) $ 364,729 Emerging market debt funds 83,668 2,499 — 86,167 Convertible funds 46,331 — (330 ) 46,001 Preferred equity investments 7,741 1,542 (300 ) 8,983 Short-term fixed income fund 128 2 — 130 Total equity securities $ 496,779 $ 14,885 $ (5,654 ) $ 506,010 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $4.3 million . 3. Investments, cont'd. December 31, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity investments U.S. government and agencies securities $ 499,386 $ 2,561 $ (3,153 ) $ 498,794 U.S. state and municipal securities 16,908 120 (181 ) 16,847 Foreign government securities 110,893 803 (581 ) 111,115 Government guaranteed corporate securities 19,248 311 (7 ) 19,552 Corporate securities 1,323,276 5,698 (11,232 ) 1,317,742 Residential mortgage-backed securities 1,041,540 16,400 (5,141 ) 1,052,799 Commercial mortgage-backed securities 689,078 4,737 (8,053 ) 685,762 Collateralized loan and debt obligations (1) 304,915 796 (3,802 ) 301,909 Asset-backed securities 356,753 585 (2,839 ) 354,499 Total fixed maturity investments 4,361,997 32,011 (34,989 ) 4,359,019 Short-term investments 25,657 28 — 25,685 Total fixed income investments $ 4,387,654 $ 32,039 $ (34,989 ) $ 4,384,704 Equity securities Equity investments $ 418,822 $ 6,834 $ (31,875 ) $ 393,781 Emerging market debt funds 61,874 — (5,453 ) 56,421 Convertible funds 46,331 — (146 ) 46,185 Preferred equity investments 15,275 1,946 (151 ) 17,070 Short-term fixed income funds 127 1 — 128 Total equity securities $ 542,429 $ 8,781 $ (37,625 ) $ 513,585 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $11.4 million . 3. Investments, cont'd. The following tables summarize, for all available for sale securities in an unrealized loss position at June 30, 2016 and December 31, 2015 , the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position: Less than 12 months 12 months or greater Total June 30, 2016 Unrealized Losses (1) Fair Value Unrealized Losses (1) Fair Value Unrealized Losses (1) Fair Value Fixed maturity investments U.S. government and agencies securities $ (13 ) $ 7,576 $ — $ — $ (13 ) $ 7,576 U.S. state and municipal securities (23 ) 2,084 (61 ) 2,278 (84 ) 4,362 Corporate securities (188 ) 39,413 (439 ) 43,111 (627 ) 82,524 Residential mortgage-backed securities (349 ) 102,437 (543 ) 69,509 (892 ) 171,946 Commercial mortgage-backed securities (2,368 ) 169,839 (1,869 ) 70,310 (4,237 ) 240,149 Collateralized loan and debt obligations (3,138 ) 179,797 (1,169 ) 79,801 (4,307 ) 259,598 Asset-backed securities (744 ) 79,760 (345 ) 21,254 (1,089 ) 101,014 Total fixed income investments $ (6,823 ) $ 580,906 $ (4,426 ) $ 286,263 $ (11,249 ) $ 867,169 Equity securities Equity investments $ (5,022 ) $ 83,431 $ (2 ) $ 3 $ (5,024 ) $ 83,434 Convertible funds (330 ) 46,001 — — (330 ) 46,001 Preferred equity investments (244 ) 3,563 (56 ) 745 (300 ) 4,308 Total equity securities $ (5,596 ) $ 132,995 $ (58 ) $ 748 $ (5,654 ) $ 133,743 (1) Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive income at June 30, 2016 . As of June 30, 2016 , 598 available for sale securities were in an unrealized loss position aggregating $16.9 million . Of those, 223 securities with aggregated unrealized losses of $4.5 million had been in a continuous unrealized loss position for twelve months or greater. 3. Investments, cont'd. Less than 12 months 12 months or greater Total December 31, 2015 Unrealized Losses (1) Fair Value Unrealized Losses (1) Fair Value Unrealized Losses (1) Fair Value Fixed maturity investments U.S. government and agencies securities $ (2,175 ) $ 347,024 $ (978 ) $ 16,669 $ (3,153 ) $ 363,693 U.S. state and municipal securities (96 ) 9,662 (85 ) 695 (181 ) 10,357 Foreign government securities (404 ) 31,881 (177 ) 3,966 (581 ) 35,847 Government guaranteed corporate securities (7 ) 1,692 — — (7 ) 1,692 Corporate securities (9,222 ) 830,349 (2,010 ) 51,024 (11,232 ) 881,373 Residential mortgage-backed securities (3,378 ) 365,082 (1,763 ) 79,355 (5,141 ) 444,437 Commercial mortgage-backed securities (6,708 ) 436,387 (1,345 ) 42,246 (8,053 ) 478,633 Collateralized loan and debt obligations (3,107 ) 224,520 (695 ) 48,167 (3,802 ) 272,687 Asset-backed securities (2,624 ) 311,814 (215 ) 12,880 (2,839 ) 324,694 Total fixed income investments $ (27,721 ) $ 2,558,411 $ (7,268 ) $ 255,002 $ (34,989 ) $ 2,813,413 Equity securities Equity investments $ (31,875 ) $ 283,095 $ — $ — $ (31,875 ) $ 283,095 Emerging market debt funds — — (5,453 ) 56,421 (5,453 ) 56,421 Convertible funds (146 ) 46,185 — — (146 ) 46,185 Preferred equity investments (151 ) 7,361 — — (151 ) 7,361 Total equity securities $ (32,172 ) $ 336,641 $ (5,453 ) $ 56,421 $ (37,625 ) $ 393,062 (1) Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive loss at December 31, 2015 . As of December 31, 2015 , 1,310 available for sale securities were in an unrealized loss position aggregating $72.6 million . Of those, 158 securities with aggregated unrealized losses of $12.7 million had been in a continuous unrealized loss position for twelve months or greater. 3. Investments, cont'd. The decrease in gross unrealized losses on the Company's available for sale fixed income investments at June 30, 2016 compared to December 31, 2015 was primarily due to a decrease in interest rates during the six months ended June 30, 2016 . At June 30, 2016 , the Company did not have the intent to sell any of the remaining fixed income investments in an unrealized loss position and determined that it was unlikely that the Company would be required to sell those securities in an unrealized loss position. At June 30, 2016 , the Company impaired certain equity securities that were in an unrealized loss position for more than twelve consecutive months and therefore recognized in earnings total other-than-temporary impairments of $9.8 million and $10.5 million for the three and six months ended June 30, 2016 . Other Investments The Company is involved in the normal course of business with variable interest entities ("VIEs") as a passive investor in residential and commercial mortgage-backed securities and through its interests in various other investments that are structured as limited partnerships considered to be third party VIEs. The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE. The Company reassesses its VIE determination with respect to an entity on an ongoing basis. The Company determined that it was not the primary beneficiary for any of these investments as of June 30, 2016 . The Company believes its exposure to loss with respect to these investments is generally limited to the investment carrying amounts reported in the Company's Condensed Consolidated Balance Sheets and any unfunded investment commitments. Collateralized Reinsurance Entities As of June 30, 2016 , Endurance Holdings and Endurance Bermuda together owned 33.3% of BCRH's common shares. BCRH is considered a VIE under U.S. GAAP due to service agreements for investment management, underwriting and insurance management and administrative services between BCRH and BCML, and the economic penalty to terminate the service agreements by BCRH. The Company has determined that it is BCRH's primary beneficiary due to its ability to direct the activities of BCRH through BCML along with its economic interest in BCRH. As a result, the Company fully consolidates the assets, liabilities and operations of BCRH and its subsidiaries within its Unaudited Condensed Consolidated Financial Statements. The interests in BCRH and its subsidiaries that the Company fully consolidates that are attributable to third-party investors are reported within the Company's Unaudited Condensed Consolidated Financial Statements as non-controlling interests. BCRH's shareholder rights do not include redemption features within the control of the third party shareholders. The Company reassesses its VIE determination with respect to BCRH on an ongoing basis. As of June 30, 2016 , Endurance Bermuda owned 25.2% of BCGR's ordinary shares. BCGR is considered a "voting interest entity" under U.S. GAAP and, because the Company owns less than 50% of its outstanding ordinary shares, the Company does not consolidate BCGR's assets, liabilities or operations within its Unaudited Condensed Consolidated Financial Statements. However, the BCGR Cell and Blue Water Re Ltd. ("Blue Water Re"), the Company's wholly-owned Bermuda-based special purpose insurance vehicle, are considered VIEs under U.S. GAAP due to service agreements for investment management, underwriting and insurance management and administrative services between Blue Water Re and BCML. The Company has determined that it is the primary beneficiary of these entities due to its ability to direct the activities of Blue Water Re and the BCGR Cell along with its economic interest in these entities. Therefore, as funds held in BCGR are invested in the BCGR Cell, and ultimately into Blue Water Re, they are included in the Company's Unaudited Condensed Consolidated Financial Statements. Conversely, as funds previously invested by BCGR and the BCGR Cell into Blue Water Re are returned to BCGR, they are no longer included in the Company's Unaudited Condensed Consolidated Financial Statements. The interests in the BCGR Cell and Blue Water Re that the Company fully consolidates that are attributable to third-party investors are reported within the Company's Unaudited Condensed Consolidated Financial Statements as non-controlling interests. BCGR's shareholder rights do not include redemption features within the control of the third party shareholders. The Company reassesses its VIE determinations with respect to the BCGR Cell and Blue Water Re on an ongoing basis. 3. Investments, cont'd. The following table summarizes the movements in the non-redeemable non-controlling interests balance during the three and six months ended June 30, 2016 : Three Months Ended Six Months Ended Non-controlling interests, beginning of period $ 258,259 $ 267,810 Income attributable to third-party investments in the BCGR Cell 2,409 8,150 Income attributable to third-party investments in BCRH 1,305 4,627 Net income attributable to non-controlling interests 3,714 12,777 Net preferred share redemptions attributable to third-party investments in the BCGR Cell (1) (384 ) (10,007 ) Net investments attributable to third-parties in BCRH 17 33 Net change in third-party investments in non-controlling interests (367 ) (9,974 ) Dividends declared by BCRH attributable to non-controlling interests (1,755 ) (10,762 ) Non-controlling interests at June 30, 2016 $ 259,851 $ 259,851 (1) The redemption from the BCGR Cell during the six months ended June 30, 2016 was required to fund expenses, repay debt and fund dividends by BCGR.

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurement	4. Fair value measurement The Company determines the fair value of its fixed maturity investments, short-term investments, equity securities, debt, and other assets and liabilities in accordance with current accounting guidance, which defines fair value and establishes a fair value hierarchy based on inputs to the various valuation techniques used for each fair value measurement. The Company determines the estimated fair value of each individual security utilizing the highest level inputs available. Valuation inputs by security type may include the following: • Government and agencies fixed maturity securities – These securities are generally priced by pricing services or index providers. The pricing services or index providers may use current market trades for securities with similar quality, maturity and coupon. If no such trades are available, the pricing service typically uses analytical models which may incorporate option adjusted spreads, daily interest rate data and market/sector news. The Company generally classifies the fair values of government and agencies securities in Level 2. Current issue U.S. government securities are generally valued based on Level 1 inputs, which use the market approach valuation technique. • Government guaranteed corporate fixed maturity securities – These securities are generally priced by pricing services or index providers. The pricing service or index providers may use current market trades for securities with similar quality, maturity and coupon. If no such trades are available, the pricing service typically uses analytical spread models which may incorporate inputs from the U.S. treasury curve or LIBOR. The Company generally classifies the fair values of its government guaranteed corporate securities in Level 2. • Corporate fixed maturity securities – These securities are generally priced by pricing services or index providers. The pricing services or index providers typically use discounted cash flow models that incorporate benchmark curves for treasury, swap and high issuance credits. Credit spreads are developed from current market observations for like or similar securities. The Company generally classifies the fair values of its corporate securities in Level 2. The Company uses models that include unobservable inputs to price its corporate bank loan portfolio. As such, the fair values of the corporate bank loans are generally classified in Level 3. • Equity securities – These securities are generally priced by pricing services or index providers. Depending on the type of underlying equity security or equity fund, the securities are priced by pricing services or index providers based on quoted market prices in active markets or through a discounted cash flow model that incorporates benchmark curves for treasury, swap and credits for like or similar securities. The Company generally classifies the fair values of its equity securities in Level 1 or 2. 4. Fair value measurement, cont'd. • Structured securities including agency and non-agency, residential and commercial mortgage-backed securities, asset-backed securities and collateralized loan and debt obligations – These securities are generally priced by broker/dealers. Broker/dealers may use current market trades for securities with similar qualities. If no such trades are available, inputs such as bid and offer, prepayment speeds, the U.S. treasury curve, swap curve and cash settlement may be used in a discounted cash flow model to determine the fair value of a security. The Company generally classifies the fair values of its structured securities in Level 2. • Other assets and liabilities – A portion of other assets and liabilities are composed of a variety of derivative instruments used to enhance the efficiency of the investment portfolio and economically hedge certain risks. These instruments are generally priced by pricing services, broker/dealers and/or recent trading activity. The market value approach valuation technique is used to estimate the fair value for these derivatives based on significant observable market inputs. Certain derivative instruments are priced by pricing services based on quoted market prices in active markets. These derivative instruments are generally classified in Level 1. Other derivative instruments are priced using industry valuation models and are considered Level 2, as the inputs to the valuation model are based on observable market inputs. Also included in this line item are proprietary, non-exchange traded derivative-based risk management products primarily used to address weather and energy risks. The trading market for these weather and energy derivatives are generally linked to energy and agriculture commodities, weather and other natural phenomena. In instances where market prices are not available, the Company uses industry or internally developed valuation techniques such as spread option, Black Scholes, quanto and simulation modeling to determine fair value and classifies these in Level 3. These models may reference prices for similar instruments. • Debt – Outstanding debt consists of the Company's 7.0% Senior Notes due July 15, 2034, the 4.7% Senior Notes due October 15, 2022 (together, the "Senior Notes") and the Trust Preferred Securities. The fair values of the Senior Notes were obtained from a third party pricing service and pricing was based on the spread above the risk-free yield curve. The fair values of the Trust Preferred Securities were based on the spread above the risk-free yield curve. These spreads are generally obtained from the new issue market, secondary trading and broker-dealer quotes. As these spreads and the yields for the risk-free yield curve are observable market inputs, the fair values of the Senior Notes and the Trust Preferred Securities are classified in Level 2. The carrying values of cash and cash equivalents, accrued investment income, other investments, net receivable on sales of investments, net payable on purchases of investments, the amount outstanding under the BCRH Credit Agreement (as defined in Note 10) and other financial instruments not described above approximated their fair values at June 30, 2016 and December 31, 2015 . Transfers between levels are assumed to occur at the end of each period. 4. Fair value measurement, cont'd. The following table sets forth the Company's fixed maturity investments, equity securities, short-term investments, other assets and liabilities and debt categorized by the level within the hierarchy in which the fair value measurements fall at June 30, 2016 : Fair Value Measurements at June 30, 2016 Total at June 30, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Fixed maturity investments U.S. government and agencies securities $ 732,853 $ 12,492 $ 720,361 $ — U.S. state and municipal securities 27,385 — 27,385 — Foreign government securities 193,933 — 193,933 — Government guaranteed corporate securities 47,457 — 47,457 — Corporate securities 1,957,382 — 1,850,126 107,256 Residential mortgage-backed securities 1,376,822 — 1,376,822 — Commercial mortgage-backed securities 800,960 — 799,249 1,711 Collateralized loan and debt obligations 397,042 — 396,984 58 Asset-backed securities 485,245 — 485,245 — Total fixed maturity investments 6,019,079 12,492 5,897,562 109,025 Equity securities Equity investments 364,771 181,386 183,385 — Emerging market debt funds 86,167 — 86,167 — Convertible funds 46,001 — 46,001 — Preferred equity investments 14,698 — 14,698 — Short-term fixed income fund 30,705 30,705 — — Total equity securities 542,342 212,091 330,251 — Short-term investments 314,291 — 314,291 — Other assets (see Note 7) 148,370 930 113,083 34,357 Total assets $ 7,024,082 $ 225,513 $ 6,655,187 $ 143,382 Liabilities Other liabilities (see Note 7) $ 76,594 $ 1,550 $ 53,495 $ 21,549 Debt 769,554 — 769,554 — Total liabilities $ 846,148 $ 1,550 $ 823,049 $ 21,549 During the three months ended June 30, 2016 , $12.8 million of primarily corporate securities were transferred into Level 3 as no observable inputs were available. $0.5 million of collateralized loan and debt obligations were transferred out of Level 3 to Level 2 during the period. During the three months ended June 30, 2015 , $0.2 million of asset-backed securities were transferred into Level 3 as no observable inputs were available, and $4.9 million of primarily asset-backed securities were transferred out of Level 3 to Level 2 during the period as market activity for these securities increased and observable inputs became available. During the six months ended June 30, 2016 , $16.5 million of primarily corporate securities were transferred into Level 3 as no observable inputs were available. $5.5 million of primarily corporate securities were transferred out of Level 3 to Level 2 during the period. 4. Fair value measurement, cont'd. During the six months ended June 30, 2015 , $2.0 million of collateralized debt and loan obligations and asset-backed securities were transferred into Level 3 as no observable inputs were available, and $9.2 million of primarily asset-backed and commercial mortgage-backed securities were transferred out of Level 3 to Level 2 during the period as market activity for these securities increased and observable inputs became available. The following table sets forth the Company's fixed maturity investments, equity securities, short-term investments, other assets and liabilities and debt categorized by the level within the hierarchy in which the fair value measurements fall at December 31, 2015 : Fair Value Measurements at December 31, 2015 Total at December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Fixed maturity investments U.S. government and agencies securities $ 818,468 $ 37,741 $ 780,727 $ — U.S. state and municipal securities 22,406 — 22,406 — Foreign government securities 160,976 — 160,976 — Government guaranteed corporate securities 57,753 — 57,753 — Corporate securities 1,849,934 — 1,739,002 110,932 Residential mortgage-backed securities 1,311,373 — 1,311,373 — Commercial mortgage-backed securities 812,886 — 812,174 712 Collateralized loan and debt obligations 405,128 — 404,319 809 Asset-backed securities 507,255 — 507,255 — Total fixed maturity investments 5,946,179 37,741 5,795,985 112,453 Equity securities Equity investments 393,829 260,330 133,499 — Emerging market debt funds 56,421 — 56,421 — Convertible funds 46,185 — 46,185 — Preferred equity investments 17,623 — 17,623 — Short-term fixed income fund 14,756 14,756 — — Total equity securities 528,814 275,086 253,728 — Short-term investments 419,796 — 419,796 — Other assets (see Note 7) 68,892 4 27,385 41,503 Total assets $ 6,963,681 $ 312,831 $ 6,496,894 $ 153,956 Liabilities Other liabilities (see Note 7) $ 46,088 $ — $ 4,059 $ 42,029 Debt 737,974 — 737,974 — Total liabilities $ 784,062 $ — $ 742,033 $ 42,029 Level 3 assets represented 2.0% and 2.2% of the Company's total available for sale and trading investments and derivative instruments at June 30, 2016 and December 31, 2015 , respectively. Level 3 securities are primarily comprised of corporate securities, commercial mortgage-backed securities, collateralized loan and debt obligations, and weather derivatives. There were no material changes in the Company's valuation techniques for the six months ended June 30, 2016 . 4. Fair value measurement, cont'd. Other assets and other liabilities measured at fair value at June 30, 2016 include assets of $35.3 million (December 31, 2015 - $41.5 million ) and liabilities of $23.1 million (December 31, 2015 - $42.0 million ) related to proprietary, non-exchange traded derivative-based risk management products used in the Company's weather risk management business, and hedging and trading activities related to these risks. In instances where market prices are not available, the Company may use industry or internally developed valuation techniques such as historical analysis and simulation modeling to determine fair value and are considered Level 3. Observable and unobservable inputs to these valuation techniques vary by contract requirements and commodity type, are validated using market-based or independently sourced parameters where applicable and may typically include the following: • Observable inputs: contract price, notional, option strike, term to expiry, interest rate, contractual limits; • Unobservable inputs: correlation; and • Both observable and unobservable: forward commodity price, forward weather curve. The Company's weather curves are determined by taking the average payouts for each transaction within its portfolio utilizing de-trended historical weather measurements. The Company's commodity curves are determined using historical market data scaled to currently observed market prices. The range of each unobservable input could vary based on the specific commodity, including, but not limited to natural gas, electricity, crude, liquids, temperature or precipitation. Due to the diversity of the portfolio, the range of unobservable inputs could be wide-spread as reflected in the below table on quantitative information. If a trade has one or more significant valuation inputs that are unobservable, such trades are initially valued at the transaction price, which is considered to be the best initial estimate of fair value. Subsequent to the initial valuation, the Company updates market observable inputs to reflect observable market changes. The unobservable inputs are validated at each reporting period and are only changed when corroborated by evidence such as similar market transactions, third-party pricing services and/or broker or dealer quotations or other empirical market data. Changes in any or all of the unobservable inputs listed above may contribute positively or negatively to the overall portfolio fair value depending upon the underlying position. In general, movements in weather curves are the largest contributing factor that impacts fair value. 4. Fair value measurement, cont'd. Below is a summary of quantitative information regarding the significant unobservable inputs used in determining the fair value of the net weather and energy related derivative assets and liabilities classified in Level 3 that are measured at fair value on a recurring basis at June 30, 2016 and December 31, 2015 : June 30, 2016 Fair Value (Level 3) Valuation Techniques Unobservable Inputs Range Low High (Fair value in U.S. dollars in thousands) Net weather and energy related derivative assets $ 12,808 Historical Analysis and Simulation Correlation 0 1 Temperature -15F 115F Composite weather variable -25 deg. 45 deg. Rainfall 0" 2" Windspeed 0.01 m/s 25 m/s Wave height 0 m 25 m Commodity curve $ (1,000 ) $ 14,200 December 31, 2015 Fair Value (Level 3) Valuation Techniques Unobservable Inputs Range Low High (Fair value in U.S. dollars in thousands) Net weather and energy related derivative liabilities $ 526 Historical Analysis and Simulation Correlation 0 1 Temperature -15F 115F Composite weather variable -25 deg. 45 deg. Rainfall 0" 2" Windspeed 0.01 m/s 25 m/s Snowfall 0" 18" Cyclone (category) 0 5 Commodity curve $ — $ 13,000 4. Fair value measurement, cont'd. The following tables present a reconciliation of the beginning and ending balances for all assets and liabilities measured at fair value on a recurring basis using Level 3 inputs during the three months ended June 30, 2016 and 2015 : Three Months Ended June 30, 2016 Fixed maturity investments Other assets Total assets Other liabilities Level 3, beginning of period $ 108,801 $ 29,971 $ 138,772 $ (30,419 ) Total realized and unrealized gains included in earnings 1,133 — 1,133 — Total realized and unrealized losses included in earnings (300 ) — (300 ) — Total income included in other underwriting income (loss) — (226 ) (226 ) 5,492 Total loss included in other underwriting income (loss) — (3,864 ) (3,864 ) 804 Change in unrealized gains included in other comprehensive income (loss) 94 — 94 — Change in unrealized losses included in other comprehensive income (loss) (260 ) — (260 ) — Purchases 1,003 — 1,003 — Issues — 10,894 10,894 (14,652 ) Sales (13,800 ) — (13,800 ) — Settlements — (2,418 ) (2,418 ) 17,226 Transfers into Level 3 12,836 — 12,836 — Transfers out of Level 3 (482 ) — (482 ) — Level 3, end of period $ 109,025 $ 34,357 $ 143,382 $ (21,549 ) Three Months Ended June 30, 2015 Fixed maturity investments Other assets Total assets Other liabilities Level 3, beginning of period $ 9,500 $ 15,223 $ 24,723 $ (17,385 ) Total realized and unrealized losses included in earnings (2 ) — (2 ) — Total income included in other underwriting income (loss) — 3,499 3,499 7,806 Total loss included in other underwriting income (loss) — (4,152 ) (4,152 ) (3,691 ) Change in unrealized gains included in other comprehensive income (loss) 18 — 18 — Change in unrealized losses included in other comprehensive income (loss) (64 ) — (64 ) — Issues — 9,121 9,121 (12,324 ) Sales (96 ) — (96 ) — Settlements — — — 3,410 Transfers into Level 3 237 — 237 — Transfers out of Level 3 (4,886 ) — (4,886 ) — Level 3, end of period $ 4,707 $ 23,691 $ 28,398 $ (22,184 ) 4. Fair value measurement, cont'd. The following tables present a reconciliation of the beginning and ending balances for all assets and liabilities measured at fair value on a recurring basis using Level 3 inputs during the six months ended June 30, 2016 and 2015 : Six Months Ended June 30, 2016 Fixed maturity investments Other assets Total assets Other liabilities Level 3, beginning of period $ 112,453 $ 41,503 $ 153,956 $ (42,029 ) Total realized and unrealized gains included in earnings 2,316 — 2,316 — Total realized and unrealized losses included in earnings (2,347 ) — (2,347 ) — Total income included in other underwriting income (loss) — 3,548 3,548 11,119 Total loss included in other underwriting income (loss) — (7,782 ) (7,782 ) (5,356 ) Change in unrealized gains included in other comprehensive income (loss) 324 — 324 — Change in unrealized losses included in other comprehensive income (loss) (75 ) — (75 ) — Purchases 1,674 — 1,674 — Issues — 13,586 13,586 (18,745 ) Sales (16,269 ) — (16,269 ) — Settlements — (16,498 ) (16,498 ) 33,462 Transfers in to Level 3 16,465 — 16,465 — Transfers out of Level 3 (5,516 ) — (5,516 ) — Level 3, end of period $ 109,025 $ 34,357 $ 143,382 $ (21,549 ) Six Months Ended June 30, 2015 Fixed maturity investments Other assets Total assets Other liabilities Level 3, beginning of period $ 12,290 $ 25,615 $ 37,905 $ (35,366 ) Total realized and unrealized gains included in earnings 113 — 113 — Total realized and unrealized losses included in earnings (11 ) — (11 ) — Total income included in other underwriting income (loss) — 5,595 5,595 20,865 Total loss included in other underwriting income (loss) — (12,994 ) (12,994 ) (7,220 ) Change in unrealized gains included in other comprehensive income (loss) 24 — 24 — Change in unrealized losses included in other comprehensive income (loss) (193 ) — (193 ) — Purchases — — — — Issues — 12,333 12,333 (18,748 ) Sales (310 ) — (310 ) — Settlements — (6,858 ) (6,858 ) 18,285 Transfers in to Level 3 1,970 — 1,970 — Transfers out of Level 3 (9,176 ) — (9,176 ) — Level 3, end of period $ 4,707 $ 23,691 $ 28,398 $ (22,184 )

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	5. Earnings per share The two-class method utilized by the Company is an earnings allocation formula that determines earnings per share for the holders of Endurance Holdings' ordinary shares (also referred to as "common shares") and participating common shares, which includes unvested restricted shares and restricted share units that receive cash dividends, according to dividends declared and participation rights in undistributed earnings. Net income available to Endurance Holdings common and participating common shareholders is reduced by the amount of dividends declared in the current period and by the contractual amount of dividends that must be paid for the current period related to the Company's common and participating common shares. Any remaining undistributed earnings are allocated to the common and participating common shareholders to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. In periods of loss, no losses are allocated to participating common shareholders. Instead, all such losses are allocated solely to the common shareholders. Basic earnings per common share are calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding. The weighted average number of common shares excludes any dilutive effect of outstanding options and convertible securities such as unvested restricted shares and restricted share units. Diluted earnings per common share are based on the weighted average number of common shares and assumes the exercise of all dilutive stock options and the vesting or conversion of all convertible securities such as unvested restricted shares using the two-class method described above. The following table sets forth the computation of basic and diluted earnings per common share for the three and six months ended June 30, 2016 and 2015 : Three Months Ended Six Months Ended 2016 2015 2016 2015 Numerator: Net income available to common and participating common shareholders $ 76,621 $ 76,018 $ 182,999 $ 176,309 Less amount allocated to participating common shareholders (1) (1,634 ) (2,273 ) (4,008 ) (5,237 ) Net income allocated to common shareholders $ 74,987 $ 73,745 $ 178,991 $ 171,072 Denominator: Weighted average shares - basic 65,965,153 43,736,541 65,786,270 43,640,052 Share equivalents: Options 61,739 150,384 61,267 148,204 Restricted shares 30,319 9,796 27,734 4,370 Weighted average shares - diluted 66,057,211 43,896,721 65,875,271 43,792,626 Basic earnings per common share $ 1.14 $ 1.69 $ 2.72 $ 3.92 Diluted earnings per common share $ 1.14 $ 1.68 $ 2.72 $ 3.91 (1) Represents earnings attributable to holders of unvested restricted shares and restricted share units issued under the Company's equity compensation plan that are considered participating. In periods of loss, no losses are allocated to participating common shareholders (unvested restricted shares and restricted share units). 5. Earnings per share, cont'd. Endurance Holdings declared a dividend of $0.395830 per Series B preferred share and $396.8750 per Series C preferred share on May 19, 2016 ( 2015 - Series A: $0.484375 , Series B: $0.468750 , Series C - Nil ). The Series C preferred share dividend was paid on June 15, 2016 to shareholders of record on June 1, 2016 . Endurance Holdings also declared a dividend of $0.38 per common share on May 19, 2016 ( 2015 - $0.35 ). The dividend was paid on June 30, 2016 to shareholders of record on June 15, 2016 . On June 1, 2016, Endurance Holdings redeemed all 9,200,000 of its Series B preferred shares. The Series B preferred shares were redeemed at a redemption price of $25.00 per share together with a dividend of $0.395830 per share. Three Months Ended Six Months Ended 2016 2015 2016 2015 Dividends declared per Series A preferred share $ — $ 0.484375 $ — $ 0.968750 Dividends declared per Series B preferred share $ 0.395830 $ 0.468750 $ 0.864580 $ 0.937500 Dividends declared per Series C preferred share $ 396.8750 $ — $ 886.3542 $ — Dividends declared per common share $ 0.38 $ 0.35 $ 0.76 $ 0.70

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	6. Accumulated other comprehensive income The following tables present the changes in accumulated other comprehensive income balances by component for the three months ended June 30, 2016 and 2015 : For the Three Months Ended June 30, 2016 Losses on cash flow hedges Unrealized gains (losses) on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,656 ) $ 45,120 $ (44,636 ) $ (1,172 ) Other comprehensive income (loss) before reclassifications — 36,429 (37,738 ) (1,309 ) Amounts reclassified from accumulated other comprehensive income (1) 22 22,408 — 22,430 Net current period other comprehensive income (loss) 22 58,837 (37,738 ) 21,121 Ending balance $ (1,634 ) $ 103,957 $ (82,374 ) $ 19,949 (1) All amounts are net of tax. For the Three Months Ended June 30, 2015 Losses on cash flow hedges Unrealized gains (losses) on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,744 ) 110,589 $ (31,086 ) $ 77,759 Other comprehensive income (loss) before reclassifications — (57,671 ) 26,163 (31,508 ) Amounts reclassified from accumulated other comprehensive income (1) 22 (9,308 ) — (9,286 ) Net current period other comprehensive income (loss) 22 (66,979 ) 26,163 (40,794 ) Ending balance $ (1,722 ) $ 43,610 $ (4,923 ) $ 36,965 (1) All amounts are net of tax. 6. Accumulated other comprehensive income, cont'd. The following tables present the changes in accumulated other comprehensive income balances by component for the six months ended June 30, 2016 and 2015 : For the Six Months Ended June 30, 2016 Losses on cash flow hedges Unrealized gains (losses) on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,678 ) $ (12,638 ) $ (32,318 ) $ (46,634 ) Other comprehensive income (loss) before reclassifications — 91,923 (50,056 ) 41,867 Amounts reclassified from accumulated other comprehensive income (1) 44 24,672 — 24,716 Net current period other comprehensive income (loss) 44 116,595 (50,056 ) 66,583 Ending balance $ (1,634 ) $ 103,957 $ (82,374 ) $ 19,949 (1) All amounts are net of tax. For the Six Months Ended June 30, 2015 Losses on cash flow hedges Unrealized gains (losses) on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,766 ) $ 86,100 $ (7,628 ) $ 76,706 Other comprehensive income (loss) before reclassifications — (16,937 ) 2,705 (14,232 ) Amounts reclassified from accumulated other comprehensive income (1) 44 (25,553 ) — (25,509 ) Net current period other comprehensive income (loss) 44 (42,490 ) 2,705 (39,741 ) Ending balance $ (1,722 ) $ 43,610 $ (4,923 ) $ 36,965 (1) All amounts are net of tax. 6. Accumulated other comprehensive income, cont'd. The following tables present the significant items reclassified out of accumulated other comprehensive income during the three months ended June 30, 2016 and 2015 : Three Months Ended June 30, 2016 Details about accumulated other comprehensive income components Amount reclassified from accumulated other comprehensive income Affected line item in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income Losses on cash flow hedges - Debt $ 22 Interest expense 22 Total before income taxes — Income tax expense $ 22 Total net of income taxes Unrealized losses on available for sale securities $ 12,219 Net realized and unrealized gains 9,841 Net impairment losses recognized in earnings 22,060 Total before income taxes 348 Income tax expense $ 22,408 Total net of income taxes Three Months Ended June 30, 2015 Details about accumulated other comprehensive Amount reclassified Affected line item in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income Losses on cash flow hedges - Debt $ 22 Interest expense 22 Total before income taxes — Income tax expense $ 22 Total net of income taxes Unrealized gains on available for sale securities $ (9,589 ) Net realized and unrealized gains 424 Net impairment losses recognized in earnings (9,165 ) Total before income taxes (143 ) Income tax benefit $ (9,308 ) Total net of income taxes 6. Accumulated other comprehensive income, cont'd. The following tables present the significant items reclassified out of accumulated other comprehensive income during the six months ended June 30, 2016 and 2015 : Six Months Ended June 30, 2016 Details about accumulated other comprehensive income components Amount reclassified from accumulated other comprehensive income Affected line item in the Condensed Consolidated Statements of Income and Comprehensive Income Losses on cash flow hedges - Debt $ 44 Interest expense 44 Total before income taxes — Income tax expense $ 44 Total net of income taxes Unrealized losses on available for sale securities $ 14,096 Net realized and unrealized gains 10,464 Net impairment losses recognized in earnings 24,560 Total before income taxes 112 Income tax expense $ 24,672 Total net of income taxes Six Months Ended June 30, 2015 Details about accumulated other comprehensive Amount reclassified Affected line item in the Condensed Consolidated Statements of Income and Comprehensive Income Losses on cash flow hedges - Debt $ 44 Interest expense 44 Total before income taxes — Income tax expense $ 44 Total net of income taxes Unrealized gains on available for sale securities $ (27,359 ) Net realized and unrealized gains 1,073 Net impairment losses recognized in earnings (26,286 ) Total before income taxes 733 Income tax expense $ (25,553 ) Total net of income taxes

Derivatives

Derivatives	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	7. Derivatives The Company regularly transacts in certain derivative-based weather risk management products primarily to address weather and energy risks on behalf of third parties. The markets for these derivatives are generally linked to energy and agriculture commodities, weather and other natural phenomena. Generally, the Company's current portfolio of such derivative contracts is of short duration and such contracts are predominantly seasonal in nature. The Company also invests a portion of its investments with third party investment managers with investment guidelines that permit the use of derivative instruments. The Company may enter derivative transactions directly or as part of strategies employed by its external investment managers. The Company's derivative instruments are recorded in the Condensed Consolidated Balance Sheets at fair value, with changes in fair value and gains and losses recognized in net realized and unrealized gains, net foreign exchange (gains) losses and other underwriting income (loss) in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income. The Company's derivatives are not designated as hedges under current accounting guidance. The Company's objectives for holding these derivatives are as follows: Interest Rate Futures, Swaps, Swaptions and Options - to manage exposure to interest rate risk, which can include increasing or decreasing its exposure to this risk through modification of the portfolio composition and duration. Industry Loss Warranty ("ILW") Swaps - to manage underwriting risk. The Company has entered into ILW swap contracts which provide reinsurance-like protection to the Company for specific loss events associated with certain lines of its business. The Company has also sold ILW protection, which provides reinsurance-like protection to third parties for specific loss events. Foreign Exchange Forwards, Futures and Options - as part of overall currency risk management and investment strategies. Credit Default Swaps - to manage market exposures. The Company may assume or economically hedge credit risk through credit default swaps to replicate or hedge investment positions. The original term of these credit default swaps is generally five years or less. To-Be-Announced Mortgage-backed Securities ("TBAs") - to enhance investment performance and as part of overall investment strategy. TBAs represent commitments to purchase or sell a future issuance of agency mortgage-backed securities. For the period between purchase of a TBA and issuance of the underlying securities, the Company’s position is accounted for as a derivative. Energy and Weather Contracts – to address weather and energy risks. The Company may purchase or sell contracts with financial settlements based on the performance of an index linked to a quantifiable weather element, such as temperature, precipitation, snowfall or windspeed, and structures with multiple risk triggers indexed to a quantifiable weather element and a weather sensitive commodity price, such as temperature and electrical power or natural gas. Generally, the Company's current portfolio of energy and weather derivative contracts is of comparably short duration and such contracts are predominantly seasonal in nature. LIBOR Swap – to establish future net cash flows in connection with the Trust Preferred Securities for the five -year period beginning March 30, 2012 as if these securities bore interest at a fixed rate of 4.905% . Loss Development Cover – as part of the sale of Montpelier U.S. Insurance Company ("MUSIC") to Selective Insurance Group, Inc. ("Selective"), Montpelier Reinsurance Ltd. ("Montpelier Re", now Endurance Bermuda) entered into a loss development cover with MUSIC which ensures that MUSIC's reserve for losses and loss expenses relating to retained business written on or prior to December 31, 2011 remains adequate. Under the loss development cover, any future adverse development associated with such retained reserves will be protected by Endurance Bermuda and any future favorable development associated with such retained reserves will benefit Endurance Bermuda. 7. Derivatives, cont'd. The fair values and the related notional values of derivatives at June 30, 2016 and December 31, 2015 are shown below. June 30, 2016 December 31, 2015 Fair Value Notional Principal Amount Fair Value Notional Principal Amount Derivatives recorded in other assets Foreign exchange forward contracts $ 643 $ 32,735 $ 425 $ 38,818 Credit default swaps 135 4,999 36 4,225 Interest rate swaptions — 125,500 — — ILWs 3,906 20,000 — — TBAs 108,399 103,300 26,924 25,700 Energy and weather contracts 35,287 92,211 41,507 70,388 Total recorded in other assets $ 148,370 $ 68,892 Derivatives recorded in other liabilities Foreign exchange forward contracts $ 770 $ 31,116 $ 372 $ 30,400 Credit default swaps 174 5,166 276 7,800 Interest rate swaps 70 42,000 7 42,000 Interest rate futures — — 8 54,488 ILWs 1,346 14,209 259 19,500 LIBOR swap 345 100,000 233 100,000 TBAs 47,431 45,200 — — Loss development cover 3,359 23,807 2,904 22,322 Energy and weather contracts 23,099 144,186 42,029 148,325 Total recorded in other liabilities $ 76,594 $ 46,088 Net derivative asset $ 71,776 $ 22,804 At June 30, 2016 , the Company's derivative assets of $148.4 million ( December 31, 2015 - $68.9 million ) and liabilities of $76.6 million ( December 31, 2015 - $46.1 million ) are subject to master netting agreements, which provide for the ability to settle the derivative asset and liability with each counterparty on a net basis. Interest rate futures are not subject to master netting agreements. At June 30, 2016 and December 31, 2015 , the Company's derivative instruments were recorded on a gross basis in the Condensed Consolidated Balance Sheets. At June 30, 2016 , the Company held no reverse repurchase agreements. At December 31, 2015 , the Company held $30.0 million reverse repurchase agreements. These agreements were fully collateralized, were generally outstanding for a short period of time and were presented as part of cash and cash equivalents in the Condensed Consolidated Balance Sheets. The required collateral for these agreements was either cash or U.S. treasury securities at a minimum rate of 102% of the principal amount. Upon maturity, the Company received the principal and interest income. 7. Derivatives, cont'd. The gains and losses on the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income for derivatives for the three and six months ended June 30, 2016 and 2015 were as follows: Three Months Ended Six Months Ended 2016 2015 2016 2015 Total gains (losses) included in net foreign exchange (gains) losses from foreign exchange forward contracts $ 37 $ (343 ) $ (501 ) $ 1,126 Interest rate futures 55 (27 ) (227 ) 95 Credit default swaps (112 ) 9 (82 ) 9 Interest rate swaps 3 320 (48 ) (235 ) Interest rate swaptions (14 ) — (27 ) 28 ILWs (244 ) — 60 — LIBOR swap 32 — (112 ) — TBAs 476 (211 ) 962 613 Total gains included in net realized and unrealized gains 196 91 526 510 Energy and weather contracts 2,037 3,258 1,322 6,042 Loss development cover (619 ) — (1,486 ) — Total gains (losses) included in other underwriting income (loss) 1,418 3,258 (164 ) 6,042 Total gains (losses) from derivatives $ 1,651 $ 3,006 $ (139 ) $ 7,678

Stock-Based Employee Compensati

Stock-Based Employee Compensation And Other Stock Plans	6 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Employee Compensation And Other Stock Plans	8. Stock-based employee compensation and other stock plans The Company has a stock-based employee compensation plan, which provides the Company with the ability to grant options to purchase the Company's ordinary shares, share appreciation rights, restricted shares, restricted share units, share bonuses and other equity incentive awards to key employees. No options were granted or expired during the quarters and six months ended June 30, 2016 and 2015 . During the quarter and six months ended June 30, 2016 , 160,000 ( 2015 - nil ) options were exercised. During the quarter and six months ended June 30, 2016 , 160,000 ( 2015 - 160,000 ) options vested. The total intrinsic value of options exercised during the quarter and six months ended June 30, 2016 was $3.2 million . The Company received proceeds of $7.7 million from the exercise of options during the quarter and six months ended June 30, 2016 . The Company issued new ordinary shares in connection with the exercise of the above options. For the quarter ended June 30, 2016 , compensation costs recognized in earnings for all options totaled $0.2 million ( 2015 - $0.5 million ). For the six months ended June 30, 2016 , compensation costs recognized in earnings for all options totaled $0.5 million ( 2015 - $1.0 million ). At June 30, 2016 , compensation costs not yet recognized related to unvested stock options was $0.5 million ( 2015 - $1.6 million ). During the quarter ended June 30, 2016 , the Company granted an aggregate of 53,795 ( 2015 – 31,690 ) restricted shares and restricted share units. The restricted shares and restricted share units granted had weighted average grant date fair values of $3.5 million ( 2015 - $2.0 million ). During the quarter ended June 30, 2016 , the aggregate fair value of restricted shares and restricted share units that vested was $8.2 million ( 2015 - $7.8 million ). For the quarter ended June 30, 2016 , compensation costs recognized in earnings for all restricted shares and restricted share units were $9.4 million ( 2015 - $7.6 million ). At June 30, 2016 , compensation costs not yet recognized related to unvested restricted shares and restricted share units was $41.2 million ( 2015 - $34.0 million ). During the six months ended June 30, 2016 , the Company granted an aggregate of 613,967 ( 2015 – 504,352 ) restricted shares and restricted share units. The restricted shares and restricted share units granted had weighted average grant date fair values of $36.9 million ( 2015 - $30.0 million ). During the six months ended June 30, 2016 , the aggregate fair value of restricted shares and restricted share units that vested was $41.2 million ( 2015 - $21.6 million ). For the six months ended June 30, 2016 , compensation costs recognized in earnings for all restricted shares and restricted share units were $19.2 million ( 2015 - $16.9 million ). Employee Share Purchase Plan The Company also has an Employee Share Purchase Plan ("ESPP") under which employees of Endurance Holdings and certain of its subsidiaries may purchase the Company's ordinary shares. For the three and six months ended June 30, 2016 , total expenses related to the Company's ESPP were approximately $116,000 ( 2015 - $79,000 ) and $216,000 ( 2015 - $144,000 ), respectively.

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Segment Reporting	9. Segment reporting The determination of the Company's business segments is based on how the Company monitors the performance of its underwriting operations. The Company has two reportable business segments, Insurance and Reinsurance, which are comprised of the following lines of business: Insurance segment lines of business • Agriculture • Casualty and other specialty • Professional lines • Property, marine/energy and aviation Reinsurance segment lines of business • Catastrophe • Property • Casualty • Professional lines • Specialty Management measures Insurance and Reinsurance segment results on the basis of the combined ratio, which is obtained by dividing the sum of the net losses and loss expenses, acquisition expenses and general and administrative expenses by net premiums earned. When purchased within a single line of business, ceded reinsurance and recoveries are accounted for within that line of business. When purchased across multiple lines of business, ceded reinsurance and recoveries are allocated to the lines of business in proportion to the related risks assumed. The Company does not manage its assets by segment; accordingly, investment income and total assets are not allocated to the individual business segments. General and administrative expenses incurred by the segments are allocated directly. Remaining general and administrative expenses not incurred by the segments are classified as corporate expenses and are not allocated to the individual business segments. Ceded reinsurance and recoveries are recorded within the business segment to which they apply. 9. Segment reporting, cont'd. The following table provides a summary of segment revenues and results for the three months ended June 30, 2016 and the reserve for losses and loss expenses as of June 30, 2016 : Three Months Ended June 30, 2016 Insurance Reinsurance Total Revenues Gross premiums written $ 593,706 $ 543,224 $ 1,136,930 Ceded premiums written (354,104 ) (65,058 ) (419,162 ) Net premiums written 239,602 478,166 717,768 Net premiums earned 253,784 345,824 599,608 Other underwriting income — 930 930 253,784 346,754 600,538 Expenses Net losses and loss expenses 173,858 202,254 376,112 Acquisition expenses 32,868 79,093 111,961 General and administrative expenses 29,825 25,254 55,079 236,551 306,601 543,152 Underwriting income $ 17,233 $ 40,153 57,386 Net investment income 43,977 Corporate expenses (11,830 ) Net foreign exchange gains 32,751 Net realized and unrealized gains 6,347 Net impairment losses recognized in earnings (9,841 ) Amortization of intangibles (20,943 ) Interest expense (11,357 ) Income before income taxes $ 86,490 Net loss ratio 68.4 % 58.5 % 62.7 % Acquisition expense ratio 13.0 % 22.9 % 18.7 % General and administrative expense ratio 11.8 % 7.3 % 11.2 % (1) Combined ratio 93.2 % 88.7 % 92.6 % Reserve for losses and loss expenses $ 2,642,594 $ 2,085,403 $ 4,727,997 (1) Total general and administrative expense ratio includes general and administrative expenses and corporate expenses. 9. Segment reporting, cont'd. The following table provides a summary of segment revenues and results for the three months ended June 30, 2015 and the reserve for losses and loss expenses as of June 30, 2015 : Three Months Ended June 30, 2015 Insurance Reinsurance Total Revenues Gross premiums written $ 468,866 $ 392,318 $ 861,184 Ceded premiums written (278,567 ) (23,534 ) (302,101 ) Net premiums written 190,299 368,784 559,083 Net premiums earned 201,460 256,675 458,135 Other underwriting income — 1,389 1,389 201,460 258,064 459,524 Expenses Net losses and loss expenses 145,483 93,639 239,122 Acquisition expenses 17,702 67,269 84,971 General and administrative expenses 28,567 26,398 54,965 191,752 187,306 379,058 Underwriting income $ 9,708 $ 70,758 80,466 Net investment income 32,252 Corporate expenses (12,634 ) Net foreign exchange losses (12,981 ) Net realized and unrealized gains 9,680 Net impairment losses recognized in earnings (424 ) Amortization of intangibles (1,579 ) Interest expense (9,062 ) Income before income taxes $ 85,718 Net loss ratio 72.2 % 36.5 % 52.2 % Acquisition expense ratio 8.8 % 26.2 % 18.5 % General and administrative expense ratio 14.2 % 10.3 % 14.8 % (1) Combined ratio 95.2 % 73.0 % 85.5 % Reserve for losses and loss expenses $ 2,157,769 $ 1,675,756 $ 3,833,525 (1) Total general and administrative expense ratio includes general and administrative expenses and corporate expenses. 9. Segment reporting, cont'd. The following table provides gross and net premiums written by line of business for the three months ended June 30, 2016 and 2015 : Gross premiums written Net premiums written Gross premiums written Net premiums written Business Segment 2016 2016 2015 2015 Insurance Agriculture $ 66,922 $ (2,962 ) $ 112,012 $ 22,677 Casualty and other specialty 178,081 77,965 146,056 65,302 Professional lines 122,679 51,204 96,736 43,443 Property, marine/energy and aviation 226,024 113,395 114,062 58,877 Total Insurance 593,706 239,602 468,866 190,299 Reinsurance Catastrophe 236,995 197,681 139,833 122,305 Property 30,646 31,304 30,560 30,118 Casualty 82,263 80,921 48,132 48,132 Professional lines 135,638 135,031 134,241 134,241 Specialty 57,682 33,229 39,552 33,988 Total Reinsurance 543,224 478,166 392,318 368,784 Total $ 1,136,930 $ 717,768 $ 861,184 $ 559,083 9. Segment reporting, cont'd. The following table provides a summary of the segment revenues and results for the six months ended June 30, 2016 : Six Months Ended June 30, 2016 Insurance Reinsurance Total Revenues Gross premiums written $ 1,428,823 $ 1,319,784 $ 2,748,607 Ceded premiums written (818,277 ) (273,720 ) (1,091,997 ) Net premiums written 610,546 1,046,064 1,656,610 Net premiums earned 473,353 679,446 1,152,799 Other underwriting loss — (1,514 ) (1,514 ) 473,353 677,932 1,151,285 Expenses Net losses and loss expenses 301,661 317,779 619,440 Acquisition expenses 63,226 152,577 215,803 General and administrative expenses 68,254 59,050 127,304 433,141 529,406 962,547 Underwriting income $ 40,212 $ 148,526 188,738 Net investment income 55,158 Corporate expenses (23,601 ) Net foreign exchange gains 44,480 Net realized and unrealized gains 20,134 Net impairment losses recognized in earnings (10,464 ) Amortization of intangibles (42,317 ) Interest expense (22,227 ) Income before income taxes $ 209,901 Net loss ratio 63.7 % 46.7 % 53.7 % Acquisition expense ratio 13.4 % 22.5 % 18.7 % General and administrative expense ratio 14.4 % 8.7 % 13.1 % (1) Combined ratio 91.5 % 77.9 % 85.5 % (1) Total general and administrative expense ratio includes general and administrative expenses and corporate expenses. 9. Segment reporting, cont'd. The following table provides a summary of the segment revenues and results for the six months ended June 30, 2015 : Six Months Ended June 30, 2015 Insurance Reinsurance Total Revenues Gross premiums written $ 1,205,084 $ 957,532 $ 2,162,616 Ceded premiums written (710,746 ) (127,833 ) (838,579 ) Net premiums written 494,338 829,699 1,324,037 Net premiums earned 337,324 510,670 847,994 Other underwriting income — 3,795 3,795 337,324 514,465 851,789 Expenses Net losses and loss expenses 219,995 191,063 411,058 Acquisition expenses 33,585 133,479 167,064 General and administrative expenses 57,409 52,446 109,855 310,989 376,988 687,977 Underwriting income $ 26,335 $ 137,477 163,812 Net investment income 74,113 Corporate expenses (24,902 ) Net foreign exchange losses (20,533 ) Net realized and unrealized gains 27,869 Net impairment losses recognized in earnings (1,073 ) Amortization of intangibles (3,178 ) Interest expense (18,121 ) Income before income taxes $ 197,987 Net loss ratio 65.2 % 37.4 % 48.5 % Acquisition expense ratio 10.0 % 26.1 % 19.7 % General and administrative expense ratio 17.0 % 10.3 % 15.9 % (1) Combined ratio 92.2 % 73.8 % 84.1 % (1) Total general and administrative expense ratio includes general and administrative expenses and corporate expenses. 9. Segment reporting, cont'd. The following table provides gross and net premiums written by line of business for the six months ended June 30, 2016 and 2015 : Gross premiums written Net premiums written Gross premiums written Net premiums written Business Segment 2016 2016 2015 2015 Insurance Agriculture $ 563,138 $ 205,665 $ 628,928 $ 225,137 Casualty and other specialty 316,336 141,462 246,738 110,360 Professional lines 200,094 94,538 151,496 67,674 Property, marine/energy and aviation 349,255 168,881 177,922 91,167 Total Insurance 1,428,823 610,546 1,205,084 494,338 Reinsurance Catastrophe 437,825 286,549 264,240 175,765 Property 187,112 181,360 156,260 153,567 Casualty 180,983 179,640 106,230 106,230 Professional lines 184,187 183,251 178,098 178,098 Specialty 329,677 215,264 252,704 216,039 Total Reinsurance 1,319,784 1,046,064 957,532 829,699 Total $ 2,748,607 $ 1,656,610 $ 2,162,616 $ 1,324,037

Commitments And Contingencies

Commitments And Contingencies	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	10. Commitments and contingencies Concentrations of credit risk. The Company's reinsurance recoverables on paid and unpaid losses at June 30, 2016 and December 31, 2015 amounted to $1,453.8 million and $1,196.0 million , respectively. At June 30, 2016 , substantially all reinsurance recoverables on paid and unpaid losses were due from the U.S. government or from reinsurers rated A- or better by A.M. Best Company, Inc. or Standard & Poor's Corporation. At June 30, 2016 and December 31, 2015 , the Company held collateral of $464.3 million and $321.5 million , respectively, related to its ceded reinsurance agreements. Major production sources. The following table shows the percentage of gross premiums written generated through the Company's largest brokers for the six months ended June 30, 2016 and 2015 , respectively: Broker 2016 2015 Marsh & McLennan Companies, Inc. 21.9 % 26.6 % Aon Benfield 14.5 % 16.2 % Willis Companies 9.4 % 10.5 % Total of largest brokers 45.8 % 53.3 % Letters of credit. As of June 30, 2016 , the Company had issued letters of credit of $283.8 million ( December 31, 2015 – $341.6 million ) under its credit facilities and letter of credit reimbursement agreements in favor of certain ceding companies to collateralize obligations. Investment commitments. As of June 30, 2016 and December 31, 2015 , the Company had pledged cash and cash equivalents and fixed maturity investments of $114.5 million and $108.9 million , respectively, in favor of certain ceding companies to collateralize obligations. As of June 30, 2016 and December 31, 2015 , the Company had also pledged $327.6 million and $383.3 million of its cash and fixed maturity investments as required to meet collateral obligations for $283.8 million and $341.6 million , respectively, in letters of credit outstanding under its credit facilities and letter of credit reimbursement agreements. In addition, as of June 30, 2016 and December 31, 2015 , cash and fixed maturity investments with fair values of $211.4 million and $208.3 million were on deposit with U.S. state regulators, respectively. 10. Commitments and contingencies, cont'd. The Company is subject to certain commitments with respect to other investments at June 30, 2016 and December 31, 2015 . See Note 3, Investments. Investment assets held in trust. Blue Water Re and Blue Water Re II do not operate with a financial strength rating and, instead, fully collateralize their reinsurance obligations through cash and cash equivalents held in trust funds established by Blue Water Re and Blue Water Re II (the "Blue Water Trusts") for the benefit of ceding companies. As of June 30, 2016 , the fair value of the assets held in the Blue Water Trusts was $429.8 million ( December 31, 2015 - $438.9 million ), which met the minimum value required on that date. As of June 30, 2016 , Blue Capital Re had pledged $183.8 million ( December 31, 2015 - $195.3 million ) of its cash and cash equivalents to trust accounts established for the benefit of Blue Water Re. Blue Capital Re ILS fully collateralizes its insurance-linked security obligations through cash and cash equivalents held in trust funds established by Blue Capital Re ILS (the "Blue Capital Re ILS Trusts") for the benefit of third parties. As of June 30, 2016 , the fair value of the assets held in the Blue Capital Re ILS Trusts was $3.4 million ( December 31, 2015 - $5.2 million ), which met the minimum value required on that date. During 2015, Endurance Bermuda established a multi-beneficiary reinsurance trust (the "Endurance Reinsurance Trust") domiciled in Delaware. The Endurance Reinsurance Trust was established as a means of providing statutory credit to Endurance Bermuda's U.S. cedants. As of June 30, 2016 , the fair value of the investments held in the Endurance Reinsurance Trust exceeded $770.5 million ( December 31, 2015 - $94.1 million ), the minimum value required on that date. During 2015, Endurance Bermuda also established a second multi-beneficiary reinsurance trust domiciled in Delaware as a means of providing statutory credit to Endurance Bermuda's U.S. cedants in connection with a reduction in collateral requirements in certain states (the "Reduced Collateral Trust"). As of June 30, 2016 , the fair value of the assets held in the Reduced Collateral Trust exceeded $18.7 million ( December 31, 2015 - $10.8 million ), the minimum value required on that date. Endurance Bermuda is party to a reinsurance trust (the "MUSIC Trust"). The MUSIC Trust was established as a means of providing statutory credit to MUSIC in support of the business retained in connection with the 2011 sale by Montpelier of MUSIC to Selective. As of June 30, 2016 , the fair value of the assets held in the MUSIC Trust was $22.0 million ( December 31, 2015 - $21.3 million ). Endurance Bermuda was party to a multi-beneficiary Reinsurance Trust originally established by Montpelier Re (the "Montpelier Reinsurance Trust") domiciled in New York. The Montpelier Reinsurance Trust was established as a means of providing statutory credit to Montpelier Re's U.S. cedants. Endurance Bermuda was also party to a multi-beneficiary reinsurance trust originally established by Montpelier Re (the "FL Trust") in connection with a reduction in its Florida collateral requirements. On April 25, 2016, the Montpelier Reinsurance Trust and the FL Trust were dissolved. Endurance Bermuda is party to a Lloyd's Deposit Trust Deed (the "Lloyd's Capital Trust") in order to meet Endurance Corporate Capital Limited ("ECCL")'s ongoing funds at Lloyd's ("FAL") requirements. The minimum value of cash and investments held by the Lloyd’s Capital Trust is subject to approval by Lloyd's and is based on ECCL's Solvency Capital Requirement, which is used to determine the required amount of FAL. As of June 30, 2016 , the fair value of cash and investments held in the Lloyd's Capital Trust was $280.6 million ( December 31, 2015 - $276.8 million ), which met the minimum value required on that date. Premiums received by Syndicate 5151 are required to be received into the Lloyd's Premiums Trust Funds (the "Premiums Trust Funds"). Under the Premiums Trust Funds' deeds, assets may only be used for the payment of claims and valid expenses for a stated period of time. As of June 30, 2016 , the fair value of all assets held in the Premiums Trust Funds was $207.3 million ( December 31, 2015 - $231.9 million ). 10. Commitments and contingencies, cont'd. The Company's investment assets held in trust appear on the Company's Condensed Consolidated Balance Sheets as cash and cash equivalents, fixed maturity investments and accrued investment income, as appropriate. Lloyd's New Central Fund. The Lloyd's New Central Fund is available to satisfy claims if a member of Lloyd's is unable to meet its obligations to policyholders. The Lloyd's New Central Fund is funded by an annual levy imposed on members, which is determined annually by Lloyd's as a percentage of each member's gross written premiums ( 0.35% with respect to 2016). In addition, the Council of Lloyd's has power to call on members to make an additional contribution to the Lloyd's New Central Fund of up to 3.0% of their underwriting capacity each year should it decide that such additional contributions are necessary. The Company currently estimates that its 2016 obligation to the Lloyd's New Central Fund will be approximately $1.1 million and accrues for this obligation ratably throughout the year on a quarterly basis. Lloyd's also imposes other charges on its members and the syndicates on which they participate, including an annual subscription charge ( 0.45% of gross written premiums with respect to 2016) and an overseas business charge, levied as a percentage of gross international premiums (defined as business outside the U.K. and the Channel Islands), with the percentage depending on the type of business written. Lloyd's also has power to impose additional charges under Lloyd's Powers of Charging Byelaw. The Company currently estimates that its 2016 obligation to Lloyd's for such charges will be approximately $1.5 million and accrues for this obligation ratably throughout the year on a quarterly basis. BCRH Credit Agreement. Upon closing of the acquisition of Montpelier on July 31, 2015, the Company became a guarantor of the BCRH 364 -day unsecured credit agreement (the "BCRH Credit Agreement"), which permitted BCRH to borrow up to $20.0 million on a revolving basis for working capital and general corporate purposes. The Company was entitled to receive an annual guarantee fee from BCRH equal to 0.125% of the facility's total capacity (the "BCRH Guarantee Agreement"). The BCRH Credit Agreement and the BCRH Guarantee Agreement expired on April 29, 2016. As of June 30, 2016 , BCRH had no outstanding borrowings under the BCRH Credit Agreement ( December 31, 2015 - $13.0 million ). With respect to BCRH's outstanding borrowings at December 31, 2015, $4.0 million was repaid on February 2, 2016 and was subject to an annual interest rate of 1.33% , $5.0 million was repaid on February 22, 2016 and was subject to an annual interest rate of 1.48% , and $4.0 million was repaid on March 11, 2016 and was subject to an annual interest rate of 1.51% . On May 6, 2016, the Company, through a wholly-owned subsidiary, entered into a credit facility agreement with BCRH (the "BCRH Credit Facility"). The BCRH Credit Facility provides BCRH with an unsecured $20.0 million revolving credit facility for working capital and general corporate purposes and expires on September 30, 2018. Borrowings under the BCRH Credit Facility bear interest, set at the time of the borrowing, at a rate equal to the applicable LIBOR rate plus 150 basis points. The BCRH Credit Facility contains covenants that limit BCRH's ability, among other things, to grant liens on its assets, sell assets, merge or consolidate, or incur debt. If BCRH fails to comply with any of these covenants, the Company could terminate the BCRH Credit Facility and exercise remedies against BCRH. In addition, in the event of a default in the performance of any of the agreements or covenants under certain management agreements with BCML by BCRH, the Company has the right to terminate the BCRH Credit Facility. As of June 30, 2016 , BCRH had no outstanding borrowings under the BCRH Credit Facility. BCGR Credit Agreement. Upon closing of the acquisition of Montpelier on July 31, 2015, the Company became a guarantor of the BCGR 364 -day unsecured credit agreement (the "BCGR Credit Agreement"), which permitted BCGR to borrow up to $20.0 million on a revolving basis for working capital and general corporate purposes. The Company was entitled to receive an annual guarantee fee from BCGR equal to 0.125% of the facility's total capacity (the "BCGR Guarantee Agreement"). The BCGR Credit Agreement and the BCGR Guarantee Agreement expired on May 12, 2016. As of June 30, 2016 , BCGR had no outstanding borrowings under the BCGR Credit Agreement ( December 31, 2015 - $6.0 million ). With respect to BCGR's outstanding borrowing at December 31, 2015, $3.0 million was repaid on February 1, 2016 and was subject to an annual interest rate of 1.54% , and $3.0 million was repaid on February 12, 2016 and was subject to an annual interest rate of 1.51% . 10. Commitments and contingencies, cont'd. On May 6, 2016, the Company, through a wholly-owned subsidiary, entered into a credit facility agreement with BCGR (the "BCGR Credit Facility"). The BCGR Credit Facility provides BCGR with an unsecured $20.0 million revolving credit facility for working capital and general corporate purposes and expires on September 30, 2018. Borrowings under the BCGR Credit Facility bear interest, set at the time of the borrowing, at a rate equal to the applicable LIBOR rate plus 150 basis points. The BCGR Credit Facility contains covenants that limit BCGR's ability, among other things, to grant liens on its assets, sell assets, merge or consolidate, or incur debt. If BCGR fails to comply with any of these covenants, the Company could terminate the BCGR Credit Facility and exercise remedies against BCGR. In addition, in the event of a default in the performance of any of the agreements or covenants under certain management agreements with BCML by BCGR, the Company has the right to terminate the BCGR Credit Facility. As of June 30, 2016 , BCGR had no outstanding borrowings under the BCGR Credit Facility. Reinsurance commitments . In the ordinary course of business, the Company periodically enters into reinsurance agreements that include terms that could require the Company to collateralize certain of its obligations. Employment agreements. The Company has entered into employment agreements with certain officers that provide for equity incentive awards, executive benefits and severance payments under certain circumstances. Operating leases. The Company leases office space and office equipment under operating leases. Future minimum lease commitments at June 30, 2016 are as follows: Twelve months ended June 30, Amount 2017 $ 16,162 2018 16,411 2019 15,503 2020 15,173 2021 13,981 2022 and thereafter 20,503 $ 97,733 Total net lease expense under operating leases for the six months ended June 30, 2016 was $6.6 million ( 2015 – $6.4 million ). Legal proceedings. The Company is party to various legal proceedings generally arising in the normal course of its business. While any proceeding contains an element of uncertainty, the Company does not believe that the eventual outcome of any litigation or arbitration proceeding to which it is presently a party could have a material adverse effect on its financial condition or business. Pursuant to the Company's insurance and reinsurance agreements, disputes are generally required to be settled by arbitration.

Debt And Financing Arrangements

Debt And Financing Arrangements (Notes)	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	11. Debt and financing arrangements Credit Facility On March 23, 2016, the Company and certain designated subsidiaries of the Company entered into a $450.0 million five -year letter of credit facility with JPMorgan Chase Bank, N.A. ("JPMorgan") as administrative agent (the "Credit Facility"). Upon entering into the Credit Facility, the Company terminated its existing $700.0 million credit agreement, dated April 19, 2012, with JPMorgan as administrative agent. As of June 30, 2016 , there were letters of credit outstanding under the Credit Facility of $272.9 million ( December 31, 2015 – $329.9 million ). The Credit Facility does not provide for revolving or term loans. The Credit Facility is collateralized on a several basis by each entity incurring such obligation by cash and securities deposited into collateral accounts from time to time with Deutsche Bank Trust Company Americas as collateral agent. So long as there is no default under the terms of the Credit Facility, the Company may request that the size of the Credit Facility be increased by $100.0 million , but no participating lender is obligated to increase its commitments under the Credit Facility. 11. Debt and financing arrangements, cont'd. The Company is required to pay a fee of 0.40% per annum on the daily stated amount of outstanding letters of credit issued under the Credit Facility. In addition, the Credit Facility requires the Company to pay to the lenders a commitment fee in the amount of 0.125% per annum on the average daily amount of the unused commitments of the lenders. The Credit Facility permits a lender, if requested and in its discretion, to issue a letter of credit pursuant to which it fronts for the other lenders. For such letters of credit, such fronting lenders may receive certain fronting fees from the Company. The Credit Facility requires the Company's compliance with certain customary restrictive covenants, including a financial covenant that the Company maintain a leverage ratio of no greater than 0.35 :1.00 at any time. In addition, each of the Company's regulated insurance subsidiaries that has a claims paying rating from A.M. Best must maintain a rating of at least B++ at all times. The Credit Facility also contains customary event of default provisions, including failure to pay any unpaid drawing under a letter of credit under the Credit Facility or interest thereon and failure to pay any fee under the Credit Facility, insolvency events of the Company or any of its subsidiaries (other than certain immaterial subsidiaries), a change in control of the Company, a breach of the representations or covenants in the Credit Facility or the security documents relating thereto and certain defaults by the Company or its subsidiaries under other indebtedness. In the case of an event of default that occurs as a result of an insolvency event of the Company or one of its designated subsidiary borrowers, the commitments of the lenders will automatically terminate and the repayment of outstanding obligations will be automatically accelerated. Upon the occurrence of any other event of default under the Credit Facility, the lenders can terminate their commitments under the Credit Facility, require repayment of any outstanding obligations under the Credit Facility, give notice of non-extension of any outstanding letters of credit in accordance with their terms, require the delivery of cash collateral for outstanding letters of credit and foreclose on any collateral held by the lenders (or any agent on their behalf) under the Credit Facility.

Summary Of Significant Accoun19

Summary Of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
New Accounting Pronouncements	In February 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-02, "Amendments to the Consolidation Analysis" ("ASU 2015-02"). Under ASU 2015-02, all legal entities are required to evaluate whether they should consolidate certain legal entities. ASU 2015-02 set forth amendments: (1) modifying the evaluation of whether limited partnerships and similar legal entities are variable interest entities ("VIEs") or voting interest entities; (2) eliminating the presumption that a general partner should consolidate a limited partnership; (3) affecting the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships; and (4) providing a scope exception from consolidation guidance for certain reporting entities. ASU 2015-02 became effective for public business entities for annual and interim periods beginning after December 15, 2015. Early adoption was permitted. The Company adopted ASU 2015-02 effective January 1, 2016 and it did not have a material impact on the Company's Unaudited Condensed Consolidated Financial Statements. 2. Summary of significant accounting policies, cont'd. In September 2015, the FASB issued ASU 2015-16, "Simplifying the Accounting for Measurement-Period Adjustments" ("ASU 2015-16"). ASU 2015-16 eliminates the requirement that an acquirer in a business combination account for measurement-period adjustments retrospectively. Instead, an acquirer will recognize a measurement-period adjustment during the period in which it determines the amount of the adjustment. ASU 2015-16 became effective for public business entities in interim and annual periods beginning after December 15, 2015. Early adoption was permitted. The Company adopted ASU 2015-16 effective January 1, 2016 and it did not have a material impact on the Company's Unaudited Condensed Consolidated Financial Statements. In January 2016, the FASB issued ASU 2016-01, "Financial Instruments - Overall, Recognition and Measurement of Financial Assets and Financial Liabilities" ("ASU 2016-01"). ASU 2016-01 requires entities to measure certain equity investments at fair value and recognize any changes in fair value in net income unless the investments qualify for a practicability exception. For financial liabilities measured using the fair value option, entities will need to present any change in fair value caused by a change in instrument-specific credit risk separately in other comprehensive income. ASU 2016-01 also changes certain disclosure requirements and other aspects of current U.S. GAAP. ASU 2016-01 is effective for public business entities for annual and interim periods beginning after December 15, 2017. Early adoption is not permitted, except for certain provisions. ASU 2016-01 should be applied by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. The amendments related to equity securities without readily determinable fair values (including disclosure requirements) should be applied prospectively. The Company is currently evaluating the impact of this guidance on its Unaudited Condensed Consolidated Financial Statements. In February 2016, the FASB issued ASU 2016-02, "Leases" ("ASU 2016-02"). The objective of ASU 2016-02 is to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. ASU 2016-02 must be applied using a modified retrospective approach. The Company is currently evaluating the impact of this guidance on its Unaudited Condensed Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting" ("ASU 2016-09"). ASU 2016-09 will change how companies account for certain aspects of share-based payments to employees. Entities will be required to recognize the income tax effects of awards in the income statement when the awards vest or are settled. The guidance also changes employers' accounting for an employee's use of shares to satisfy the employer's statutory income tax withholding obligation, and accounting for forfeitures. ASU 2016-09 is effective for public business entities for annual and interim periods beginning after December 15, 2016. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on its Unaudited Condensed Consolidated Financial Statements. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses - Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"). ASU 2016-13 will change how companies measure credit losses for most financial assets and certain other instruments that aren't measured at fair value through net income. The standard will replace today's "incurred loss" approach with an "expected loss" model for instruments measured at amortized cost and require entities to record allowances for available-for-sale debt securities rather than reduce the carrying amount, as they do today under the other-than-temporary impairment model. ASU 2016-13 is effective for public business entities for annual and interim periods beginning after December 15, 2019. Early adoption is permitted for all entities for annual periods beginning after December 15, 2018, and interim periods therein. The Company is currently evaluating the impact of this guidance on its Unaudited Condensed Consolidated Financial Statements.

Investments (Policy)

Investments (Policy)	6 Months Ended
	Jun. 30, 2016
Investments [Abstract]
Other Investments	In addition to the Company's fixed maturity, short-term and equity securities, the Company invests in alternative funds and specialty funds. The Company's alternative funds and specialty funds are recorded on the Company's balance sheet as "other investments."
Gain Loss On Investments	Realized gains and losses are recognized in earnings using the first in, first out method.
Variable Interest Entities	Other Investments The Company is involved in the normal course of business with variable interest entities ("VIEs") as a passive investor in residential and commercial mortgage-backed securities and through its interests in various other investments that are structured as limited partnerships considered to be third party VIEs. The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE. The Company reassesses its VIE determination with respect to an entity on an ongoing basis. The Company determined that it was not the primary beneficiary for any of these investments as of June 30, 2016 . The Company believes its exposure to loss with respect to these investments is generally limited to the investment carrying amounts reported in the Company's Condensed Consolidated Balance Sheets and any unfunded investment commitments. Collateralized Reinsurance Entities As of June 30, 2016 , Endurance Holdings and Endurance Bermuda together owned 33.3% of BCRH's common shares. BCRH is considered a VIE under U.S. GAAP due to service agreements for investment management, underwriting and insurance management and administrative services between BCRH and BCML, and the economic penalty to terminate the service agreements by BCRH. The Company has determined that it is BCRH's primary beneficiary due to its ability to direct the activities of BCRH through BCML along with its economic interest in BCRH. As a result, the Company fully consolidates the assets, liabilities and operations of BCRH and its subsidiaries within its Unaudited Condensed Consolidated Financial Statements. The interests in BCRH and its subsidiaries that the Company fully consolidates that are attributable to third-party investors are reported within the Company's Unaudited Condensed Consolidated Financial Statements as non-controlling interests. BCRH's shareholder rights do not include redemption features within the control of the third party shareholders. The Company reassesses its VIE determination with respect to BCRH on an ongoing basis. As of June 30, 2016 , Endurance Bermuda owned 25.2% of BCGR's ordinary shares. BCGR is considered a "voting interest entity" under U.S. GAAP and, because the Company owns less than 50% of its outstanding ordinary shares, the Company does not consolidate BCGR's assets, liabilities or operations within its Unaudited Condensed Consolidated Financial Statements. However, the BCGR Cell and Blue Water Re Ltd. ("Blue Water Re"), the Company's wholly-owned Bermuda-based special purpose insurance vehicle, are considered VIEs under U.S. GAAP due to service agreements for investment management, underwriting and insurance management and administrative services between Blue Water Re and BCML. The Company has determined that it is the primary beneficiary of these entities due to its ability to direct the activities of Blue Water Re and the BCGR Cell along with its economic interest in these entities. Therefore, as funds held in BCGR are invested in the BCGR Cell, and ultimately into Blue Water Re, they are included in the Company's Unaudited Condensed Consolidated Financial Statements. Conversely, as funds previously invested by BCGR and the BCGR Cell into Blue Water Re are returned to BCGR, they are no longer included in the Company's Unaudited Condensed Consolidated Financial Statements. The interests in the BCGR Cell and Blue Water Re that the Company fully consolidates that are attributable to third-party investors are reported within the Company's Unaudited Condensed Consolidated Financial Statements as non-controlling interests. BCGR's shareholder rights do not include redemption features within the control of the third party shareholders. The Company reassesses its VIE determinations with respect to the BCGR Cell and Blue Water Re on an ongoing basis.

Fair Value Measurement (Policy)

Fair Value Measurement (Policy)	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Of Financial Instruments	The Company determines the fair value of its fixed maturity investments, short-term investments, equity securities, debt, and other assets and liabilities in accordance with current accounting guidance, which defines fair value and establishes a fair value hierarchy based on inputs to the various valuation techniques used for each fair value measurement. The Company determines the estimated fair value of each individual security utilizing the highest level inputs available. Valuation inputs by security type may include the following: • Government and agencies fixed maturity securities – These securities are generally priced by pricing services or index providers. The pricing services or index providers may use current market trades for securities with similar quality, maturity and coupon. If no such trades are available, the pricing service typically uses analytical models which may incorporate option adjusted spreads, daily interest rate data and market/sector news. The Company generally classifies the fair values of government and agencies securities in Level 2. Current issue U.S. government securities are generally valued based on Level 1 inputs, which use the market approach valuation technique. • Government guaranteed corporate fixed maturity securities – These securities are generally priced by pricing services or index providers. The pricing service or index providers may use current market trades for securities with similar quality, maturity and coupon. If no such trades are available, the pricing service typically uses analytical spread models which may incorporate inputs from the U.S. treasury curve or LIBOR. The Company generally classifies the fair values of its government guaranteed corporate securities in Level 2. • Corporate fixed maturity securities – These securities are generally priced by pricing services or index providers. The pricing services or index providers typically use discounted cash flow models that incorporate benchmark curves for treasury, swap and high issuance credits. Credit spreads are developed from current market observations for like or similar securities. The Company generally classifies the fair values of its corporate securities in Level 2. The Company uses models that include unobservable inputs to price its corporate bank loan portfolio. As such, the fair values of the corporate bank loans are generally classified in Level 3. • Equity securities – These securities are generally priced by pricing services or index providers. Depending on the type of underlying equity security or equity fund, the securities are priced by pricing services or index providers based on quoted market prices in active markets or through a discounted cash flow model that incorporates benchmark curves for treasury, swap and credits for like or similar securities. The Company generally classifies the fair values of its equity securities in Level 1 or 2. 4. Fair value measurement, cont'd. • Structured securities including agency and non-agency, residential and commercial mortgage-backed securities, asset-backed securities and collateralized loan and debt obligations – These securities are generally priced by broker/dealers. Broker/dealers may use current market trades for securities with similar qualities. If no such trades are available, inputs such as bid and offer, prepayment speeds, the U.S. treasury curve, swap curve and cash settlement may be used in a discounted cash flow model to determine the fair value of a security. The Company generally classifies the fair values of its structured securities in Level 2. • Other assets and liabilities – A portion of other assets and liabilities are composed of a variety of derivative instruments used to enhance the efficiency of the investment portfolio and economically hedge certain risks. These instruments are generally priced by pricing services, broker/dealers and/or recent trading activity. The market value approach valuation technique is used to estimate the fair value for these derivatives based on significant observable market inputs. Certain derivative instruments are priced by pricing services based on quoted market prices in active markets. These derivative instruments are generally classified in Level 1. Other derivative instruments are priced using industry valuation models and are considered Level 2, as the inputs to the valuation model are based on observable market inputs. Also included in this line item are proprietary, non-exchange traded derivative-based risk management products primarily used to address weather and energy risks. The trading market for these weather and energy derivatives are generally linked to energy and agriculture commodities, weather and other natural phenomena. In instances where market prices are not available, the Company uses industry or internally developed valuation techniques such as spread option, Black Scholes, quanto and simulation modeling to determine fair value and classifies these in Level 3. These models may reference prices for similar instruments. • Debt – Outstanding debt consists of the Company's 7.0% Senior Notes due July 15, 2034, the 4.7% Senior Notes due October 15, 2022 (together, the "Senior Notes") and the Trust Preferred Securities. The fair values of the Senior Notes were obtained from a third party pricing service and pricing was based on the spread above the risk-free yield curve. The fair values of the Trust Preferred Securities were based on the spread above the risk-free yield curve. These spreads are generally obtained from the new issue market, secondary trading and broker-dealer quotes. As these spreads and the yields for the risk-free yield curve are observable market inputs, the fair values of the Senior Notes and the Trust Preferred Securities are classified in Level 2. The carrying values of cash and cash equivalents, accrued investment income, other investments, net receivable on sales of investments, net payable on purchases of investments, the amount outstanding under the BCRH Credit Agreement (as defined in Note 10) and other financial instruments not described above approximated their fair values at June 30, 2016 and December 31, 2015 .
Fair Value Transfer Between Levels	Transfers between levels are assumed to occur at the end of each period.

Earnings Per Share (Policy)

Earnings Per Share (Policy)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	The two-class method utilized by the Company is an earnings allocation formula that determines earnings per share for the holders of Endurance Holdings' ordinary shares (also referred to as "common shares") and participating common shares, which includes unvested restricted shares and restricted share units that receive cash dividends, according to dividends declared and participation rights in undistributed earnings. Net income available to Endurance Holdings common and participating common shareholders is reduced by the amount of dividends declared in the current period and by the contractual amount of dividends that must be paid for the current period related to the Company's common and participating common shares. Any remaining undistributed earnings are allocated to the common and participating common shareholders to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. In periods of loss, no losses are allocated to participating common shareholders. Instead, all such losses are allocated solely to the common shareholders. Basic earnings per common share are calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding. The weighted average number of common shares excludes any dilutive effect of outstanding options and convertible securities such as unvested restricted shares and restricted share units. Diluted earnings per common share are based on the weighted average number of common shares and assumes the exercise of all dilutive stock options and the vesting or conversion of all convertible securities such as unvested restricted shares using the two-class method described above.

Derivatives (Policy)

Derivatives (Policy)	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Accounting policy for derivatives	The Company regularly transacts in certain derivative-based weather risk management products primarily to address weather and energy risks on behalf of third parties. The markets for these derivatives are generally linked to energy and agriculture commodities, weather and other natural phenomena. Generally, the Company's current portfolio of such derivative contracts is of short duration and such contracts are predominantly seasonal in nature. The Company also invests a portion of its investments with third party investment managers with investment guidelines that permit the use of derivative instruments. The Company may enter derivative transactions directly or as part of strategies employed by its external investment managers. The Company's derivative instruments are recorded in the Condensed Consolidated Balance Sheets at fair value, with changes in fair value and gains and losses recognized in net realized and unrealized gains, net foreign exchange (gains) losses and other underwriting income (loss) in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income. The Company's derivatives are not designated as hedges under current accounting guidance. The Company's objectives for holding these derivatives are as follows: Interest Rate Futures, Swaps, Swaptions and Options - to manage exposure to interest rate risk, which can include increasing or decreasing its exposure to this risk through modification of the portfolio composition and duration. Industry Loss Warranty ("ILW") Swaps - to manage underwriting risk. The Company has entered into ILW swap contracts which provide reinsurance-like protection to the Company for specific loss events associated with certain lines of its business. The Company has also sold ILW protection, which provides reinsurance-like protection to third parties for specific loss events. Foreign Exchange Forwards, Futures and Options - as part of overall currency risk management and investment strategies. Credit Default Swaps - to manage market exposures. The Company may assume or economically hedge credit risk through credit default swaps to replicate or hedge investment positions. The original term of these credit default swaps is generally five years or less. To-Be-Announced Mortgage-backed Securities ("TBAs") - to enhance investment performance and as part of overall investment strategy. TBAs represent commitments to purchase or sell a future issuance of agency mortgage-backed securities. For the period between purchase of a TBA and issuance of the underlying securities, the Company’s position is accounted for as a derivative. Energy and Weather Contracts – to address weather and energy risks. The Company may purchase or sell contracts with financial settlements based on the performance of an index linked to a quantifiable weather element, such as temperature, precipitation, snowfall or windspeed, and structures with multiple risk triggers indexed to a quantifiable weather element and a weather sensitive commodity price, such as temperature and electrical power or natural gas. Generally, the Company's current portfolio of energy and weather derivative contracts is of comparably short duration and such contracts are predominantly seasonal in nature. LIBOR Swap – to establish future net cash flows in connection with the Trust Preferred Securities for the five -year period beginning March 30, 2012 as if these securities bore interest at a fixed rate of 4.905% . Loss Development Cover – as part of the sale of Montpelier U.S. Insurance Company ("MUSIC") to Selective Insurance Group, Inc. ("Selective"), Montpelier Reinsurance Ltd. ("Montpelier Re", now Endurance Bermuda) entered into a loss development cover with MUSIC which ensures that MUSIC's reserve for losses and loss expenses relating to retained business written on or prior to December 31, 2011 remains adequate. Under the loss development cover, any future adverse development associated with such retained reserves will be protected by Endurance Bermuda and any future favorable development associated with such retained reserves will benefit Endurance Bermuda.
Offsetting of derivatives policy	At June 30, 2016 and December 31, 2015 , the Company's derivative instruments were recorded on a gross basis in the Condensed Consolidated Balance Sheets.

Segment Reporting (Policy)

Segment Reporting (Policy)	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Segment Reporting	The determination of the Company's business segments is based on how the Company monitors the performance of its underwriting operations. The Company has two reportable business segments, Insurance and Reinsurance, which are comprised of the following lines of business: Insurance segment lines of business • Agriculture • Casualty and other specialty • Professional lines • Property, marine/energy and aviation Reinsurance segment lines of business • Catastrophe • Property • Casualty • Professional lines • Specialty Management measures Insurance and Reinsurance segment results on the basis of the combined ratio, which is obtained by dividing the sum of the net losses and loss expenses, acquisition expenses and general and administrative expenses by net premiums earned. When purchased within a single line of business, ceded reinsurance and recoveries are accounted for within that line of business. When purchased across multiple lines of business, ceded reinsurance and recoveries are allocated to the lines of business in proportion to the related risks assumed. The Company does not manage its assets by segment; accordingly, investment income and total assets are not allocated to the individual business segments. General and administrative expenses incurred by the segments are allocated directly. Remaining general and administrative expenses not incurred by the segments are classified as corporate expenses and are not allocated to the individual business segments. Ceded reinsurance and recoveries are recorded within the business segment to which they apply.

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2016
Investments [Abstract]
Composition Of Net Investment Income	The components of net investment income for the three and six months ended June 30, 2016 and 2015 are as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Fixed income investments $ 38,904 $ 29,689 $ 77,304 $ 59,941 Equity investments 3,001 1,771 6,848 3,452 Other investments 5,252 3,570 (23,005 ) 15,958 Cash and cash equivalents 604 679 1,651 1,593 47,761 35,709 $ 62,798 $ 80,944 Investment expenses (3,784 ) (3,457 ) (7,640 ) (6,831 ) Net investment income $ 43,977 $ 32,252 $ 55,158 $ 74,113
Contractual Maturities Of Fixed Maturity And Short-Term Investments	Contractual maturities of the Company's fixed maturity and short-term investments are shown below as of June 30, 2016 and December 31, 2015 . Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2016 December 31, 2015 Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 540,959 $ 541,461 $ 622,070 $ 622,248 Due after one year through five years 1,907,495 1,936,574 2,005,456 1,995,502 Due after five years through ten years 727,906 747,343 683,147 676,932 Due after ten years 44,651 47,923 33,168 34,651 Residential mortgage-backed securities 1,343,837 1,376,822 1,301,083 1,311,373 Commercial mortgage-backed securities 789,314 800,960 817,570 812,886 Collateralized loan and debt obligations 405,438 397,042 419,795 405,128 Asset-backed securities 483,516 485,245 510,540 507,255 Total $ 6,243,116 $ 6,333,370 $ 6,392,829 $ 6,365,975
Fair Value of Trading Investments	The following table summarizes the fair value of the fixed maturity investments, short-term investments and equity securities classified as trading at June 30, 2016 and December 31, 2015 : June 30, 2016 December 31, 2015 Fixed maturity investments U.S. government and agencies securities $ 379,470 $ 319,674 U.S. state and municipal securities 5,233 5,559 Foreign government securities 105,014 49,861 Government guaranteed corporate securities 35,410 38,201 Corporate securities 817,194 532,192 Residential mortgage-backed securities 329,982 258,574 Commercial mortgage-backed securities 171,128 127,124 Collateralized loan and debt obligations (1) 91,024 103,219 Asset-backed securities 192,145 152,756 Total fixed maturity investments 2,126,600 1,587,160 Short-term investments 295,442 394,111 Total fixed income investments $ 2,422,042 $ 1,981,271 Equity securities Equity investments $ 42 $ 48 Preferred equity investments 5,715 553 Short-term fixed income fund 30,575 14,628 Total equity securities $ 36,332 $ 15,229 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $17.0 million and $38.5 million at June 30, 2016 and December 31, 2015 , respectively.
Other Investments	The following table summarizes the composition, unfunded commitments and redemption restrictions of other investments as of June 30, 2016 and December 31, 2015 : June 30, 2016 Market Value Unfunded Commitments Ineligible for Redemption over next 12 months Alternative funds Hedge funds $ 600,016 $ — $ 43,304 Private investment funds 78,168 98,450 78,168 Other investment funds 29,256 — 29,282 Total alternative funds 707,440 98,450 150,754 Specialty funds High yield loan funds 72,370 — — Total specialty funds 72,370 — — Total other investments $ 779,810 $ 98,450 $ 150,754 December 31, 2015 Market Value Unfunded Ineligible for Alternative funds Hedge funds $ 704,966 $ — $ 57,876 Private investment funds 80,690 102,070 80,690 Other investment funds 23,465 — 24,958 Total alternative funds 809,121 102,070 163,524 Specialty funds High yield loan funds 63,496 30,000 — Total specialty funds 63,496 30,000 — Total other investments $ 872,617 $ 132,070 $ 163,524
Net Realized And Unrealized Gains	The analysis of gross realized gains and losses, net unrealized gains on trading securities, and the change in the fair value of investment-related derivative financial instruments for the three and six months ended June 30, 2016 and 2015 is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Gross realized gains on investment sales $ 14,848 $ 14,647 $ 24,704 $ 37,313 Gross realized losses on investment sales (35,977 ) (5,058 ) (47,172 ) (9,954 ) Net unrealized gains on trading securities 27,280 — 42,076 — Change in fair value of investment-related derivative financial instruments (1) 196 91 526 510 Net realized and unrealized gains $ 6,347 $ 9,680 $ 20,134 $ 27,869 (1) For additional information on the Company's derivative financial instruments, see Note 7, Derivatives.
Amortized Cost, Fair Value, Gross Unrealized Gains and Losses For Available For Sale Investments	December 31, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity investments U.S. government and agencies securities $ 499,386 $ 2,561 $ (3,153 ) $ 498,794 U.S. state and municipal securities 16,908 120 (181 ) 16,847 Foreign government securities 110,893 803 (581 ) 111,115 Government guaranteed corporate securities 19,248 311 (7 ) 19,552 Corporate securities 1,323,276 5,698 (11,232 ) 1,317,742 Residential mortgage-backed securities 1,041,540 16,400 (5,141 ) 1,052,799 Commercial mortgage-backed securities 689,078 4,737 (8,053 ) 685,762 Collateralized loan and debt obligations (1) 304,915 796 (3,802 ) 301,909 Asset-backed securities 356,753 585 (2,839 ) 354,499 Total fixed maturity investments 4,361,997 32,011 (34,989 ) 4,359,019 Short-term investments 25,657 28 — 25,685 Total fixed income investments $ 4,387,654 $ 32,039 $ (34,989 ) $ 4,384,704 Equity securities Equity investments $ 418,822 $ 6,834 $ (31,875 ) $ 393,781 Emerging market debt funds 61,874 — (5,453 ) 56,421 Convertible funds 46,331 — (146 ) 46,185 Preferred equity investments 15,275 1,946 (151 ) 17,070 Short-term fixed income funds 127 1 — 128 Total equity securities $ 542,429 $ 8,781 $ (37,625 ) $ 513,585 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $11.4 million . The amortized cost, fair value and related gross unrealized gains and losses on the Company's securities classified as available for sale at June 30, 2016 and December 31, 2015 are as follows: June 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity investments U.S. government and agencies securities $ 342,507 $ 10,889 $ (13 ) $ 353,383 U.S. state and municipal securities 21,744 492 (84 ) 22,152 Foreign government securities 86,698 2,221 — 88,919 Government guaranteed corporate securities 11,682 365 — 12,047 Corporate securities 1,115,782 25,033 (627 ) 1,140,188 Residential mortgage-backed securities 1,018,452 29,280 (892 ) 1,046,840 Commercial mortgage-backed securities 621,501 12,568 (4,237 ) 629,832 Collateralized loan and debt obligations (1) 309,571 754 (4,307 ) 306,018 Asset-backed securities 292,297 1,892 (1,089 ) 293,100 Total fixed maturity investments 3,820,234 83,494 (11,249 ) 3,892,479 Short-term investments 18,846 3 — 18,849 Total fixed income investments $ 3,839,080 $ 83,497 $ (11,249 ) $ 3,911,328 Equity securities Equity investments $ 358,911 $ 10,842 $ (5,024 ) $ 364,729 Emerging market debt funds 83,668 2,499 — 86,167 Convertible funds 46,331 — (330 ) 46,001 Preferred equity investments 7,741 1,542 (300 ) 8,983 Short-term fixed income fund 128 2 — 130 Total equity securities $ 496,779 $ 14,885 $ (5,654 ) $ 506,010 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $4.3 million .
Available For Sale Securities In An Unrealized Loss Position	The following tables summarize, for all available for sale securities in an unrealized loss position at June 30, 2016 and December 31, 2015 , the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position: Less than 12 months 12 months or greater Total June 30, 2016 Unrealized Losses (1) Fair Value Unrealized Losses (1) Fair Value Unrealized Losses (1) Fair Value Fixed maturity investments U.S. government and agencies securities $ (13 ) $ 7,576 $ — $ — $ (13 ) $ 7,576 U.S. state and municipal securities (23 ) 2,084 (61 ) 2,278 (84 ) 4,362 Corporate securities (188 ) 39,413 (439 ) 43,111 (627 ) 82,524 Residential mortgage-backed securities (349 ) 102,437 (543 ) 69,509 (892 ) 171,946 Commercial mortgage-backed securities (2,368 ) 169,839 (1,869 ) 70,310 (4,237 ) 240,149 Collateralized loan and debt obligations (3,138 ) 179,797 (1,169 ) 79,801 (4,307 ) 259,598 Asset-backed securities (744 ) 79,760 (345 ) 21,254 (1,089 ) 101,014 Total fixed income investments $ (6,823 ) $ 580,906 $ (4,426 ) $ 286,263 $ (11,249 ) $ 867,169 Equity securities Equity investments $ (5,022 ) $ 83,431 $ (2 ) $ 3 $ (5,024 ) $ 83,434 Convertible funds (330 ) 46,001 — — (330 ) 46,001 Preferred equity investments (244 ) 3,563 (56 ) 745 (300 ) 4,308 Total equity securities $ (5,596 ) $ 132,995 $ (58 ) $ 748 $ (5,654 ) $ 133,743 (1) Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive income at June 30, 2016 . Less than 12 months 12 months or greater Total December 31, 2015 Unrealized Losses (1) Fair Value Unrealized Losses (1) Fair Value Unrealized Losses (1) Fair Value Fixed maturity investments U.S. government and agencies securities $ (2,175 ) $ 347,024 $ (978 ) $ 16,669 $ (3,153 ) $ 363,693 U.S. state and municipal securities (96 ) 9,662 (85 ) 695 (181 ) 10,357 Foreign government securities (404 ) 31,881 (177 ) 3,966 (581 ) 35,847 Government guaranteed corporate securities (7 ) 1,692 — — (7 ) 1,692 Corporate securities (9,222 ) 830,349 (2,010 ) 51,024 (11,232 ) 881,373 Residential mortgage-backed securities (3,378 ) 365,082 (1,763 ) 79,355 (5,141 ) 444,437 Commercial mortgage-backed securities (6,708 ) 436,387 (1,345 ) 42,246 (8,053 ) 478,633 Collateralized loan and debt obligations (3,107 ) 224,520 (695 ) 48,167 (3,802 ) 272,687 Asset-backed securities (2,624 ) 311,814 (215 ) 12,880 (2,839 ) 324,694 Total fixed income investments $ (27,721 ) $ 2,558,411 $ (7,268 ) $ 255,002 $ (34,989 ) $ 2,813,413 Equity securities Equity investments $ (31,875 ) $ 283,095 $ — $ — $ (31,875 ) $ 283,095 Emerging market debt funds — — (5,453 ) 56,421 (5,453 ) 56,421 Convertible funds (146 ) 46,185 — — (146 ) 46,185 Preferred equity investments (151 ) 7,361 — — (151 ) 7,361 Total equity securities $ (32,172 ) $ 336,641 $ (5,453 ) $ 56,421 $ (37,625 ) $ 393,062 (1) Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive loss at December 31, 2015 .
Noncontrolling Interests Rollforward	The following table summarizes the movements in the non-redeemable non-controlling interests balance during the three and six months ended June 30, 2016 : Three Months Ended Six Months Ended Non-controlling interests, beginning of period $ 258,259 $ 267,810 Income attributable to third-party investments in the BCGR Cell 2,409 8,150 Income attributable to third-party investments in BCRH 1,305 4,627 Net income attributable to non-controlling interests 3,714 12,777 Net preferred share redemptions attributable to third-party investments in the BCGR Cell (1) (384 ) (10,007 ) Net investments attributable to third-parties in BCRH 17 33 Net change in third-party investments in non-controlling interests (367 ) (9,974 ) Dividends declared by BCRH attributable to non-controlling interests (1,755 ) (10,762 ) Non-controlling interests at June 30, 2016 $ 259,851 $ 259,851 (1) The redemption from the BCGR Cell during the six months ended June 30, 2016 was required to fund expenses, repay debt and fund dividends by BCGR.

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Schedule Of Fixed Maturity Investments, Equity Securities, Short-term Investments, Derivative Instruments And Debt Measured On A Recurring Basis	The following table sets forth the Company's fixed maturity investments, equity securities, short-term investments, other assets and liabilities and debt categorized by the level within the hierarchy in which the fair value measurements fall at December 31, 2015 : Fair Value Measurements at December 31, 2015 Total at December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Fixed maturity investments U.S. government and agencies securities $ 818,468 $ 37,741 $ 780,727 $ — U.S. state and municipal securities 22,406 — 22,406 — Foreign government securities 160,976 — 160,976 — Government guaranteed corporate securities 57,753 — 57,753 — Corporate securities 1,849,934 — 1,739,002 110,932 Residential mortgage-backed securities 1,311,373 — 1,311,373 — Commercial mortgage-backed securities 812,886 — 812,174 712 Collateralized loan and debt obligations 405,128 — 404,319 809 Asset-backed securities 507,255 — 507,255 — Total fixed maturity investments 5,946,179 37,741 5,795,985 112,453 Equity securities Equity investments 393,829 260,330 133,499 — Emerging market debt funds 56,421 — 56,421 — Convertible funds 46,185 — 46,185 — Preferred equity investments 17,623 — 17,623 — Short-term fixed income fund 14,756 14,756 — — Total equity securities 528,814 275,086 253,728 — Short-term investments 419,796 — 419,796 — Other assets (see Note 7) 68,892 4 27,385 41,503 Total assets $ 6,963,681 $ 312,831 $ 6,496,894 $ 153,956 Liabilities Other liabilities (see Note 7) $ 46,088 $ — $ 4,059 $ 42,029 Debt 737,974 — 737,974 — Total liabilities $ 784,062 $ — $ 742,033 $ 42,029 The following table sets forth the Company's fixed maturity investments, equity securities, short-term investments, other assets and liabilities and debt categorized by the level within the hierarchy in which the fair value measurements fall at June 30, 2016 : Fair Value Measurements at June 30, 2016 Total at June 30, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Fixed maturity investments U.S. government and agencies securities $ 732,853 $ 12,492 $ 720,361 $ — U.S. state and municipal securities 27,385 — 27,385 — Foreign government securities 193,933 — 193,933 — Government guaranteed corporate securities 47,457 — 47,457 — Corporate securities 1,957,382 — 1,850,126 107,256 Residential mortgage-backed securities 1,376,822 — 1,376,822 — Commercial mortgage-backed securities 800,960 — 799,249 1,711 Collateralized loan and debt obligations 397,042 — 396,984 58 Asset-backed securities 485,245 — 485,245 — Total fixed maturity investments 6,019,079 12,492 5,897,562 109,025 Equity securities Equity investments 364,771 181,386 183,385 — Emerging market debt funds 86,167 — 86,167 — Convertible funds 46,001 — 46,001 — Preferred equity investments 14,698 — 14,698 — Short-term fixed income fund 30,705 30,705 — — Total equity securities 542,342 212,091 330,251 — Short-term investments 314,291 — 314,291 — Other assets (see Note 7) 148,370 930 113,083 34,357 Total assets $ 7,024,082 $ 225,513 $ 6,655,187 $ 143,382 Liabilities Other liabilities (see Note 7) $ 76,594 $ 1,550 $ 53,495 $ 21,549 Debt 769,554 — 769,554 — Total liabilities $ 846,148 $ 1,550 $ 823,049 $ 21,549
Fair Value Inputs Assets And Liabilities Quantitative Information [Table Text Block]	Below is a summary of quantitative information regarding the significant unobservable inputs used in determining the fair value of the net weather and energy related derivative assets and liabilities classified in Level 3 that are measured at fair value on a recurring basis at June 30, 2016 and December 31, 2015 : June 30, 2016 Fair Value (Level 3) Valuation Techniques Unobservable Inputs Range Low High (Fair value in U.S. dollars in thousands) Net weather and energy related derivative assets $ 12,808 Historical Analysis and Simulation Correlation 0 1 Temperature -15F 115F Composite weather variable -25 deg. 45 deg. Rainfall 0" 2" Windspeed 0.01 m/s 25 m/s Wave height 0 m 25 m Commodity curve $ (1,000 ) $ 14,200 December 31, 2015 Fair Value (Level 3) Valuation Techniques Unobservable Inputs Range Low High (Fair value in U.S. dollars in thousands) Net weather and energy related derivative liabilities $ 526 Historical Analysis and Simulation Correlation 0 1 Temperature -15F 115F Composite weather variable -25 deg. 45 deg. Rainfall 0" 2" Windspeed 0.01 m/s 25 m/s Snowfall 0" 18" Cyclone (category) 0 5 Commodity curve $ — $ 13,000
Reconciliation Of The Beginning And Ending Balances For All Investments And Derivative Instruments Measured At Fair Value On A Recurring Basis Using Level 3 Inputs	The following tables present a reconciliation of the beginning and ending balances for all assets and liabilities measured at fair value on a recurring basis using Level 3 inputs during the three months ended June 30, 2016 and 2015 : Three Months Ended June 30, 2016 Fixed maturity investments Other assets Total assets Other liabilities Level 3, beginning of period $ 108,801 $ 29,971 $ 138,772 $ (30,419 ) Total realized and unrealized gains included in earnings 1,133 — 1,133 — Total realized and unrealized losses included in earnings (300 ) — (300 ) — Total income included in other underwriting income (loss) — (226 ) (226 ) 5,492 Total loss included in other underwriting income (loss) — (3,864 ) (3,864 ) 804 Change in unrealized gains included in other comprehensive income (loss) 94 — 94 — Change in unrealized losses included in other comprehensive income (loss) (260 ) — (260 ) — Purchases 1,003 — 1,003 — Issues — 10,894 10,894 (14,652 ) Sales (13,800 ) — (13,800 ) — Settlements — (2,418 ) (2,418 ) 17,226 Transfers into Level 3 12,836 — 12,836 — Transfers out of Level 3 (482 ) — (482 ) — Level 3, end of period $ 109,025 $ 34,357 $ 143,382 $ (21,549 ) Three Months Ended June 30, 2015 Fixed maturity investments Other assets Total assets Other liabilities Level 3, beginning of period $ 9,500 $ 15,223 $ 24,723 $ (17,385 ) Total realized and unrealized losses included in earnings (2 ) — (2 ) — Total income included in other underwriting income (loss) — 3,499 3,499 7,806 Total loss included in other underwriting income (loss) — (4,152 ) (4,152 ) (3,691 ) Change in unrealized gains included in other comprehensive income (loss) 18 — 18 — Change in unrealized losses included in other comprehensive income (loss) (64 ) — (64 ) — Issues — 9,121 9,121 (12,324 ) Sales (96 ) — (96 ) — Settlements — — — 3,410 Transfers into Level 3 237 — 237 — Transfers out of Level 3 (4,886 ) — (4,886 ) — Level 3, end of period $ 4,707 $ 23,691 $ 28,398 $ (22,184 ) The following tables present a reconciliation of the beginning and ending balances for all assets and liabilities measured at fair value on a recurring basis using Level 3 inputs during the six months ended June 30, 2016 and 2015 : Six Months Ended June 30, 2016 Fixed maturity investments Other assets Total assets Other liabilities Level 3, beginning of period $ 112,453 $ 41,503 $ 153,956 $ (42,029 ) Total realized and unrealized gains included in earnings 2,316 — 2,316 — Total realized and unrealized losses included in earnings (2,347 ) — (2,347 ) — Total income included in other underwriting income (loss) — 3,548 3,548 11,119 Total loss included in other underwriting income (loss) — (7,782 ) (7,782 ) (5,356 ) Change in unrealized gains included in other comprehensive income (loss) 324 — 324 — Change in unrealized losses included in other comprehensive income (loss) (75 ) — (75 ) — Purchases 1,674 — 1,674 — Issues — 13,586 13,586 (18,745 ) Sales (16,269 ) — (16,269 ) — Settlements — (16,498 ) (16,498 ) 33,462 Transfers in to Level 3 16,465 — 16,465 — Transfers out of Level 3 (5,516 ) — (5,516 ) — Level 3, end of period $ 109,025 $ 34,357 $ 143,382 $ (21,549 ) Six Months Ended June 30, 2015 Fixed maturity investments Other assets Total assets Other liabilities Level 3, beginning of period $ 12,290 $ 25,615 $ 37,905 $ (35,366 ) Total realized and unrealized gains included in earnings 113 — 113 — Total realized and unrealized losses included in earnings (11 ) — (11 ) — Total income included in other underwriting income (loss) — 5,595 5,595 20,865 Total loss included in other underwriting income (loss) — (12,994 ) (12,994 ) (7,220 ) Change in unrealized gains included in other comprehensive income (loss) 24 — 24 — Change in unrealized losses included in other comprehensive income (loss) (193 ) — (193 ) — Purchases — — — — Issues — 12,333 12,333 (18,748 ) Sales (310 ) — (310 ) — Settlements — (6,858 ) (6,858 ) 18,285 Transfers in to Level 3 1,970 — 1,970 — Transfers out of Level 3 (9,176 ) — (9,176 ) — Level 3, end of period $ 4,707 $ 23,691 $ 28,398 $ (22,184 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Schedule Of Computation Of Basic And Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per common share for the three and six months ended June 30, 2016 and 2015 : Three Months Ended Six Months Ended 2016 2015 2016 2015 Numerator: Net income available to common and participating common shareholders $ 76,621 $ 76,018 $ 182,999 $ 176,309 Less amount allocated to participating common shareholders (1) (1,634 ) (2,273 ) (4,008 ) (5,237 ) Net income allocated to common shareholders $ 74,987 $ 73,745 $ 178,991 $ 171,072 Denominator: Weighted average shares - basic 65,965,153 43,736,541 65,786,270 43,640,052 Share equivalents: Options 61,739 150,384 61,267 148,204 Restricted shares 30,319 9,796 27,734 4,370 Weighted average shares - diluted 66,057,211 43,896,721 65,875,271 43,792,626 Basic earnings per common share $ 1.14 $ 1.69 $ 2.72 $ 3.92 Diluted earnings per common share $ 1.14 $ 1.68 $ 2.72 $ 3.91 (1) Represents earnings attributable to holders of unvested restricted shares and restricted share units issued under the Company's equity compensation plan that are considered participating. In periods of loss, no losses are allocated to participating common shareholders (unvested restricted shares and restricted share units).
Schedule Of Dividends Declared	Three Months Ended Six Months Ended 2016 2015 2016 2015 Dividends declared per Series A preferred share $ — $ 0.484375 $ — $ 0.968750 Dividends declared per Series B preferred share $ 0.395830 $ 0.468750 $ 0.864580 $ 0.937500 Dividends declared per Series C preferred share $ 396.8750 $ — $ 886.3542 $ — Dividends declared per common share $ 0.38 $ 0.35 $ 0.76 $ 0.70

Accumulated Other Comprehensi28

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Income	The following tables present the changes in accumulated other comprehensive income balances by component for the six months ended June 30, 2016 and 2015 : For the Six Months Ended June 30, 2016 Losses on cash flow hedges Unrealized gains (losses) on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,678 ) $ (12,638 ) $ (32,318 ) $ (46,634 ) Other comprehensive income (loss) before reclassifications — 91,923 (50,056 ) 41,867 Amounts reclassified from accumulated other comprehensive income (1) 44 24,672 — 24,716 Net current period other comprehensive income (loss) 44 116,595 (50,056 ) 66,583 Ending balance $ (1,634 ) $ 103,957 $ (82,374 ) $ 19,949 (1) All amounts are net of tax. For the Six Months Ended June 30, 2015 Losses on cash flow hedges Unrealized gains (losses) on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,766 ) $ 86,100 $ (7,628 ) $ 76,706 Other comprehensive income (loss) before reclassifications — (16,937 ) 2,705 (14,232 ) Amounts reclassified from accumulated other comprehensive income (1) 44 (25,553 ) — (25,509 ) Net current period other comprehensive income (loss) 44 (42,490 ) 2,705 (39,741 ) Ending balance $ (1,722 ) $ 43,610 $ (4,923 ) $ 36,965 (1) All amounts are net of tax. The following tables present the changes in accumulated other comprehensive income balances by component for the three months ended June 30, 2016 and 2015 : For the Three Months Ended June 30, 2016 Losses on cash flow hedges Unrealized gains (losses) on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,656 ) $ 45,120 $ (44,636 ) $ (1,172 ) Other comprehensive income (loss) before reclassifications — 36,429 (37,738 ) (1,309 ) Amounts reclassified from accumulated other comprehensive income (1) 22 22,408 — 22,430 Net current period other comprehensive income (loss) 22 58,837 (37,738 ) 21,121 Ending balance $ (1,634 ) $ 103,957 $ (82,374 ) $ 19,949 (1) All amounts are net of tax. For the Three Months Ended June 30, 2015 Losses on cash flow hedges Unrealized gains (losses) on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,744 ) 110,589 $ (31,086 ) $ 77,759 Other comprehensive income (loss) before reclassifications — (57,671 ) 26,163 (31,508 ) Amounts reclassified from accumulated other comprehensive income (1) 22 (9,308 ) — (9,286 ) Net current period other comprehensive income (loss) 22 (66,979 ) 26,163 (40,794 ) Ending balance $ (1,722 ) $ 43,610 $ (4,923 ) $ 36,965 (1) All amounts are net of tax.
Reclassification Out Of Accumulated Other Comprehensive Income	The following tables present the significant items reclassified out of accumulated other comprehensive income during the three months ended June 30, 2016 and 2015 : Three Months Ended June 30, 2016 Details about accumulated other comprehensive income components Amount reclassified from accumulated other comprehensive income Affected line item in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income Losses on cash flow hedges - Debt $ 22 Interest expense 22 Total before income taxes — Income tax expense $ 22 Total net of income taxes Unrealized losses on available for sale securities $ 12,219 Net realized and unrealized gains 9,841 Net impairment losses recognized in earnings 22,060 Total before income taxes 348 Income tax expense $ 22,408 Total net of income taxes Three Months Ended June 30, 2015 Details about accumulated other comprehensive Amount reclassified Affected line item in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income Losses on cash flow hedges - Debt $ 22 Interest expense 22 Total before income taxes — Income tax expense $ 22 Total net of income taxes Unrealized gains on available for sale securities $ (9,589 ) Net realized and unrealized gains 424 Net impairment losses recognized in earnings (9,165 ) Total before income taxes (143 ) Income tax benefit $ (9,308 ) Total net of income taxes The following tables present the significant items reclassified out of accumulated other comprehensive income during the six months ended June 30, 2016 and 2015 : Six Months Ended June 30, 2016 Details about accumulated other comprehensive income components Amount reclassified from accumulated other comprehensive income Affected line item in the Condensed Consolidated Statements of Income and Comprehensive Income Losses on cash flow hedges - Debt $ 44 Interest expense 44 Total before income taxes — Income tax expense $ 44 Total net of income taxes Unrealized losses on available for sale securities $ 14,096 Net realized and unrealized gains 10,464 Net impairment losses recognized in earnings 24,560 Total before income taxes 112 Income tax expense $ 24,672 Total net of income taxes Six Months Ended June 30, 2015 Details about accumulated other comprehensive Amount reclassified Affected line item in the Condensed Consolidated Statements of Income and Comprehensive Income Losses on cash flow hedges - Debt $ 44 Interest expense 44 Total before income taxes — Income tax expense $ 44 Total net of income taxes Unrealized gains on available for sale securities $ (27,359 ) Net realized and unrealized gains 1,073 Net impairment losses recognized in earnings (26,286 ) Total before income taxes 733 Income tax expense $ (25,553 ) Total net of income taxes

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of The Fair Value And Related Notional Amounts Of Derivatives Included In The Company's Consolidated Balance Sheet	The fair values and the related notional values of derivatives at June 30, 2016 and December 31, 2015 are shown below. June 30, 2016 December 31, 2015 Fair Value Notional Principal Amount Fair Value Notional Principal Amount Derivatives recorded in other assets Foreign exchange forward contracts $ 643 $ 32,735 $ 425 $ 38,818 Credit default swaps 135 4,999 36 4,225 Interest rate swaptions — 125,500 — — ILWs 3,906 20,000 — — TBAs 108,399 103,300 26,924 25,700 Energy and weather contracts 35,287 92,211 41,507 70,388 Total recorded in other assets $ 148,370 $ 68,892 Derivatives recorded in other liabilities Foreign exchange forward contracts $ 770 $ 31,116 $ 372 $ 30,400 Credit default swaps 174 5,166 276 7,800 Interest rate swaps 70 42,000 7 42,000 Interest rate futures — — 8 54,488 ILWs 1,346 14,209 259 19,500 LIBOR swap 345 100,000 233 100,000 TBAs 47,431 45,200 — — Loss development cover 3,359 23,807 2,904 22,322 Energy and weather contracts 23,099 144,186 42,029 148,325 Total recorded in other liabilities $ 76,594 $ 46,088 Net derivative asset $ 71,776 $ 22,804
Schedule Of The Gains And Losses On The Consolidated Statements Of Income And Comprehensive Income From Derivatives	The gains and losses on the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income for derivatives for the three and six months ended June 30, 2016 and 2015 were as follows: Three Months Ended Six Months Ended 2016 2015 2016 2015 Total gains (losses) included in net foreign exchange (gains) losses from foreign exchange forward contracts $ 37 $ (343 ) $ (501 ) $ 1,126 Interest rate futures 55 (27 ) (227 ) 95 Credit default swaps (112 ) 9 (82 ) 9 Interest rate swaps 3 320 (48 ) (235 ) Interest rate swaptions (14 ) — (27 ) 28 ILWs (244 ) — 60 — LIBOR swap 32 — (112 ) — TBAs 476 (211 ) 962 613 Total gains included in net realized and unrealized gains 196 91 526 510 Energy and weather contracts 2,037 3,258 1,322 6,042 Loss development cover (619 ) — (1,486 ) — Total gains (losses) included in other underwriting income (loss) 1,418 3,258 (164 ) 6,042 Total gains (losses) from derivatives $ 1,651 $ 3,006 $ (139 ) $ 7,678

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Summary Of The Segment Revenues, Results And Reserve For Losses And Loss Expenses	The following table provides a summary of segment revenues and results for the three months ended June 30, 2015 and the reserve for losses and loss expenses as of June 30, 2015 : Three Months Ended June 30, 2015 Insurance Reinsurance Total Revenues Gross premiums written $ 468,866 $ 392,318 $ 861,184 Ceded premiums written (278,567 ) (23,534 ) (302,101 ) Net premiums written 190,299 368,784 559,083 Net premiums earned 201,460 256,675 458,135 Other underwriting income — 1,389 1,389 201,460 258,064 459,524 Expenses Net losses and loss expenses 145,483 93,639 239,122 Acquisition expenses 17,702 67,269 84,971 General and administrative expenses 28,567 26,398 54,965 191,752 187,306 379,058 Underwriting income $ 9,708 $ 70,758 80,466 Net investment income 32,252 Corporate expenses (12,634 ) Net foreign exchange losses (12,981 ) Net realized and unrealized gains 9,680 Net impairment losses recognized in earnings (424 ) Amortization of intangibles (1,579 ) Interest expense (9,062 ) Income before income taxes $ 85,718 Net loss ratio 72.2 % 36.5 % 52.2 % Acquisition expense ratio 8.8 % 26.2 % 18.5 % General and administrative expense ratio 14.2 % 10.3 % 14.8 % (1) Combined ratio 95.2 % 73.0 % 85.5 % Reserve for losses and loss expenses $ 2,157,769 $ 1,675,756 $ 3,833,525 (1) Total general and administrative expense ratio includes general and administrative expenses and corporate expenses. The following table provides a summary of segment revenues and results for the three months ended June 30, 2016 and the reserve for losses and loss expenses as of June 30, 2016 : Three Months Ended June 30, 2016 Insurance Reinsurance Total Revenues Gross premiums written $ 593,706 $ 543,224 $ 1,136,930 Ceded premiums written (354,104 ) (65,058 ) (419,162 ) Net premiums written 239,602 478,166 717,768 Net premiums earned 253,784 345,824 599,608 Other underwriting income — 930 930 253,784 346,754 600,538 Expenses Net losses and loss expenses 173,858 202,254 376,112 Acquisition expenses 32,868 79,093 111,961 General and administrative expenses 29,825 25,254 55,079 236,551 306,601 543,152 Underwriting income $ 17,233 $ 40,153 57,386 Net investment income 43,977 Corporate expenses (11,830 ) Net foreign exchange gains 32,751 Net realized and unrealized gains 6,347 Net impairment losses recognized in earnings (9,841 ) Amortization of intangibles (20,943 ) Interest expense (11,357 ) Income before income taxes $ 86,490 Net loss ratio 68.4 % 58.5 % 62.7 % Acquisition expense ratio 13.0 % 22.9 % 18.7 % General and administrative expense ratio 11.8 % 7.3 % 11.2 % (1) Combined ratio 93.2 % 88.7 % 92.6 % Reserve for losses and loss expenses $ 2,642,594 $ 2,085,403 $ 4,727,997 (1) Total general and administrative expense ratio includes general and administrative expenses and corporate expenses. The following table provides a summary of the segment revenues and results for the six months ended June 30, 2016 : Six Months Ended June 30, 2016 Insurance Reinsurance Total Revenues Gross premiums written $ 1,428,823 $ 1,319,784 $ 2,748,607 Ceded premiums written (818,277 ) (273,720 ) (1,091,997 ) Net premiums written 610,546 1,046,064 1,656,610 Net premiums earned 473,353 679,446 1,152,799 Other underwriting loss — (1,514 ) (1,514 ) 473,353 677,932 1,151,285 Expenses Net losses and loss expenses 301,661 317,779 619,440 Acquisition expenses 63,226 152,577 215,803 General and administrative expenses 68,254 59,050 127,304 433,141 529,406 962,547 Underwriting income $ 40,212 $ 148,526 188,738 Net investment income 55,158 Corporate expenses (23,601 ) Net foreign exchange gains 44,480 Net realized and unrealized gains 20,134 Net impairment losses recognized in earnings (10,464 ) Amortization of intangibles (42,317 ) Interest expense (22,227 ) Income before income taxes $ 209,901 Net loss ratio 63.7 % 46.7 % 53.7 % Acquisition expense ratio 13.4 % 22.5 % 18.7 % General and administrative expense ratio 14.4 % 8.7 % 13.1 % (1) Combined ratio 91.5 % 77.9 % 85.5 % (1) Total general and administrative expense ratio includes general and administrative expenses and corporate expenses. 9. Segment reporting, cont'd. The following table provides a summary of the segment revenues and results for the six months ended June 30, 2015 : Six Months Ended June 30, 2015 Insurance Reinsurance Total Revenues Gross premiums written $ 1,205,084 $ 957,532 $ 2,162,616 Ceded premiums written (710,746 ) (127,833 ) (838,579 ) Net premiums written 494,338 829,699 1,324,037 Net premiums earned 337,324 510,670 847,994 Other underwriting income — 3,795 3,795 337,324 514,465 851,789 Expenses Net losses and loss expenses 219,995 191,063 411,058 Acquisition expenses 33,585 133,479 167,064 General and administrative expenses 57,409 52,446 109,855 310,989 376,988 687,977 Underwriting income $ 26,335 $ 137,477 163,812 Net investment income 74,113 Corporate expenses (24,902 ) Net foreign exchange losses (20,533 ) Net realized and unrealized gains 27,869 Net impairment losses recognized in earnings (1,073 ) Amortization of intangibles (3,178 ) Interest expense (18,121 ) Income before income taxes $ 197,987 Net loss ratio 65.2 % 37.4 % 48.5 % Acquisition expense ratio 10.0 % 26.1 % 19.7 % General and administrative expense ratio 17.0 % 10.3 % 15.9 % (1) Combined ratio 92.2 % 73.8 % 84.1 % (1) Total general and administrative expense ratio includes general and administrative expenses and corporate expenses.
Schedule Of Gross And Net Premiums Written By Line Of Business	The following table provides gross and net premiums written by line of business for the three months ended June 30, 2016 and 2015 : Gross premiums written Net premiums written Gross premiums written Net premiums written Business Segment 2016 2016 2015 2015 Insurance Agriculture $ 66,922 $ (2,962 ) $ 112,012 $ 22,677 Casualty and other specialty 178,081 77,965 146,056 65,302 Professional lines 122,679 51,204 96,736 43,443 Property, marine/energy and aviation 226,024 113,395 114,062 58,877 Total Insurance 593,706 239,602 468,866 190,299 Reinsurance Catastrophe 236,995 197,681 139,833 122,305 Property 30,646 31,304 30,560 30,118 Casualty 82,263 80,921 48,132 48,132 Professional lines 135,638 135,031 134,241 134,241 Specialty 57,682 33,229 39,552 33,988 Total Reinsurance 543,224 478,166 392,318 368,784 Total $ 1,136,930 $ 717,768 $ 861,184 $ 559,083 The following table provides gross and net premiums written by line of business for the six months ended June 30, 2016 and 2015 : Gross premiums written Net premiums written Gross premiums written Net premiums written Business Segment 2016 2016 2015 2015 Insurance Agriculture $ 563,138 $ 205,665 $ 628,928 $ 225,137 Casualty and other specialty 316,336 141,462 246,738 110,360 Professional lines 200,094 94,538 151,496 67,674 Property, marine/energy and aviation 349,255 168,881 177,922 91,167 Total Insurance 1,428,823 610,546 1,205,084 494,338 Reinsurance Catastrophe 437,825 286,549 264,240 175,765 Property 187,112 181,360 156,260 153,567 Casualty 180,983 179,640 106,230 106,230 Professional lines 184,187 183,251 178,098 178,098 Specialty 329,677 215,264 252,704 216,039 Total Reinsurance 1,319,784 1,046,064 957,532 829,699 Total $ 2,748,607 $ 1,656,610 $ 2,162,616 $ 1,324,037

Commitments And Contingencies (

Commitments And Contingencies (Tables)	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule Of Percentage Of Gross Premiums Written	The following table shows the percentage of gross premiums written generated through the Company's largest brokers for the six months ended June 30, 2016 and 2015 , respectively: Broker 2016 2015 Marsh & McLennan Companies, Inc. 21.9 % 26.6 % Aon Benfield 14.5 % 16.2 % Willis Companies 9.4 % 10.5 % Total of largest brokers 45.8 % 53.3 %
Schedule Of Future Minimum Lease Commitments	Future minimum lease commitments at June 30, 2016 are as follows: Twelve months ended June 30, Amount 2017 $ 16,162 2018 16,411 2019 15,503 2020 15,173 2021 13,981 2022 and thereafter 20,503 $ 97,733

General (Details)

General (Details)	6 Months Ended
	Jun. 30, 2016
Blue Capital Reinsurance Holdings [Member]
Noncontrolling Interest [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	33.30%
Blue Capital Global Reinsurance Fund [Member]
Noncontrolling Interest [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	25.20%

Investments (Narrative) (Detail

Investments (Narrative) (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016USD ($)		Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)		Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Investments [Abstract]
Number of available for sale securities in an unrealized loss position	598			598			1,310
Number of available for sale securities in a continuous unrealized loss position for twelve months or greater	223			223			158
Unrealized losses	$ 16,900	[1]		$ 16,900	[1]		$ 72,600	[2]
Unrealized losses, 12 months or greater	4,500	[1]		4,500	[1]		$ 12,700	[2]
Net impairment losses recognized in earnings	$ 9,841		$ 424	$ 10,464		$ 1,073
[1]	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive income at June 30, 2016.
[2]	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive loss at December 31, 2015.

Investments (Composition Of Net

Investments (Composition Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Investment Income [Line Items]
Investment income before investment expenses	$ 47,761	$ 35,709	$ 62,798	$ 80,944
Investment expenses	(3,784)	(3,457)	(7,640)	(6,831)
Net investment income	43,977	32,252	55,158	74,113
Fixed income investments
Net Investment Income [Line Items]
Investment income before investment expenses	38,904	29,689	77,304	59,941
Equity investments
Net Investment Income [Line Items]
Investment income before investment expenses	3,001	1,771	6,848	3,452
Other investments
Net Investment Income [Line Items]
Investment income before investment expenses	5,252	3,570	(23,005)	15,958
Cash and cash equivalents
Net Investment Income [Line Items]
Investment income before investment expenses	$ 604	$ 679	$ 1,651	$ 1,593

Investments (Contractual Maturi

Investments (Contractual Maturities Of Fixed Income Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale and Trading Securities [Line Items]
Due within one year, amortized cost	$ 540,959	$ 622,070
Due within one year, fair value	541,461	622,248
Due after one year through five years, amortized cost	1,907,495	2,005,456
Due after one year through five years, fair value	1,936,574	1,995,502
Due after five years through ten years, amortized cost	727,906	683,147
Due after five years through ten years, fair value	747,343	676,932
Due after ten years, amortized cost	44,651	33,168
Due after ten years, fair value	47,923	34,651
Residential mortgage-backed securities
Schedule of Available-for-sale and Trading Securities [Line Items]
No single maturity date, amortized cost	1,343,837	1,301,083
No single maturity date, fair value	1,376,822	1,311,373
Fixed income investments, fair value	1,376,822	1,311,373
Commercial mortgage-backed securities
Schedule of Available-for-sale and Trading Securities [Line Items]
No single maturity date, amortized cost	789,314	817,570
No single maturity date, fair value	800,960	812,886
Fixed income investments, fair value	800,960	812,886
Collateralized loan and debt obligations
Schedule of Available-for-sale and Trading Securities [Line Items]
No single maturity date, amortized cost	405,438	419,795
No single maturity date, fair value	397,042	405,128
Fixed income investments, fair value	397,042	405,128
Asset-backed securities
Schedule of Available-for-sale and Trading Securities [Line Items]
No single maturity date, amortized cost	483,516	510,540
No single maturity date, fair value	485,245	507,255
Fixed income investments, fair value	485,245	507,255
Fixed income investments
Schedule of Available-for-sale and Trading Securities [Line Items]
Fixed income investments, amortized cost	6,243,116	6,392,829
Fixed income investments, fair value	$ 6,333,370	$ 6,365,975

Investments (Fair Value of Trad

Investments (Fair Value of Trading Investments) (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		$ 2,126,600	$ 1,587,160
Equity securities, trading at fair value		36,332	15,229
U.S. government and agencies securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		379,470	319,674
U.S. state and municipal securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		5,233	5,559
Foreign government securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		105,014	49,861
Government guaranteed corporate securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		35,410	38,201
Corporate securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		817,194	532,192
Residential mortgage-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		329,982	258,574
Commercial mortgage-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		171,128	127,124
Collateralized loan and debt obligations(1)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value	[1]	91,024	103,219
Asset-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		192,145	152,756
Fixed maturity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		2,126,600	1,587,160
Short-term investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		295,442	394,111
Fixed income investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		2,422,042	1,981,271
Equity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity securities, trading at fair value		42	48
Preferred equity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity securities, trading at fair value		5,715	553
Equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity securities, trading at fair value		36,332	15,229
Collateralized debt obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		17,000	38,500
Short-term fixed income fund
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity securities, trading at fair value		$ 30,575	$ 14,628
[1]	Balances include amounts related to collateralized debt obligations held with total fair values of $17.0 million and $38.5 million at June 30, 2016 and December 31, 2015, respectively.

Investments (Other Investments)

Investments (Other Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Other investments, market value	$ 779,810	$ 872,617
Commitments under investment fund classified within other investments	98,450	132,070
Prohibited amount under redemption requests over the next 12 months	150,754	163,524
Alternative funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	707,440	809,121
Commitments under investment fund classified within other investments	98,450	102,070
Prohibited amount under redemption requests over the next 12 months	150,754	163,524
Hedge funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	600,016	704,966
Commitments under investment fund classified within other investments	0	0
Prohibited amount under redemption requests over the next 12 months	43,304	57,876
Private investment funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	78,168	80,690
Commitments under investment fund classified within other investments	98,450	102,070
Prohibited amount under redemption requests over the next 12 months	78,168	80,690
Other investment funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	29,256	23,465
Commitments under investment fund classified within other investments	0	0
Prohibited amount under redemption requests over the next 12 months	29,282	24,958
Specialty funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	72,370	63,496
Commitments under investment fund classified within other investments	0	30,000
Prohibited amount under redemption requests over the next 12 months	0	0
High yield loan funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	72,370	63,496
Commitments under investment fund classified within other investments	0	30,000
Prohibited amount under redemption requests over the next 12 months	$ 0	$ 0

Investments (Other Investments

Investments (Other Investments Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Other investments, invested amount	$ 687,600	$ 737,100
Other investments, market value	779,810	872,617
Alternative funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	$ 707,440	809,121
Hedge funds
Schedule of Equity Method Investments [Line Items]
Estimated liquidation, percentage in next 12 months	92.80%
Other investments, market value	$ 600,016	704,966
Hedge funds | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated notice period, in days	180 days
Estimated remaining liquidation period in years	2 years
Hedge funds | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated notice period, in days	30 days
Estimated remaining liquidation period in years	1 year
Private investment funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	$ 78,168	80,690
Private investment funds | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated remaining liquidation period in years	10 years
Private investment funds | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated remaining liquidation period in years	5 years
Specialty funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	$ 72,370	63,496
High yield loan funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	$ 72,370	$ 63,496
High yield loan funds | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated notice period, in days	60 days
High yield loan funds | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated notice period, in days	30 days

Investments (Net Realized and U

Investments (Net Realized and Unrealized Gains) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Investments [Abstract]
Gross realized gains on investment sales		$ 14,848	$ 14,647	$ 24,704	$ 37,313
Gross realized losses on investment sales		(35,977)	(5,058)	(47,172)	(9,954)
Net unrealized gains on trading securities		27,280	0	42,076	0
Change in fair value of derivative financial instruments	[1]	196	91	526	510
Net realized and unrealized gains		$ 6,347	$ 9,680	$ 20,134	$ 27,869
[1]	For additional information on the Company's derivative financial instruments, see Note 7, Derivatives.

Investments (Amortized Cost, Fa

Investments (Amortized Cost, Fair Value, Gross Unrealized Gains And Losses For Available For Sale Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2016		Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	$ 3,820,234		$ 4,361,997
Fixed income investments, fair value	3,892,479		4,359,019
Equity securities, cost	496,779		542,429
Equity securities, fair value	506,010		513,585
U.S. government and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	342,507		499,386
Fixed income investments, gross unrealized gains	10,889		2,561
Fixed income investments, gross unrealized losses	(13)		(3,153)
Fixed income investments, fair value	353,383		498,794
U.S. state and municipal securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	21,744		16,908
Fixed income investments, gross unrealized gains	492		120
Fixed income investments, gross unrealized losses	(84)		(181)
Fixed income investments, fair value	22,152		16,847
Foreign government securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	86,698		110,893
Fixed income investments, gross unrealized gains	2,221		803
Fixed income investments, gross unrealized losses	0		(581)
Fixed income investments, fair value	88,919		111,115
Government guaranteed corporate securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	11,682		19,248
Fixed income investments, gross unrealized gains	365		311
Fixed income investments, gross unrealized losses	0		(7)
Fixed income investments, fair value	12,047		19,552
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	1,115,782		1,323,276
Fixed income investments, gross unrealized gains	25,033		5,698
Fixed income investments, gross unrealized losses	(627)		(11,232)
Fixed income investments, fair value	1,140,188		1,317,742
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	1,018,452		1,041,540
Fixed income investments, gross unrealized gains	29,280		16,400
Fixed income investments, gross unrealized losses	(892)		(5,141)
Fixed income investments, fair value	1,046,840		1,052,799
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	621,501		689,078
Fixed income investments, gross unrealized gains	12,568		4,737
Fixed income investments, gross unrealized losses	(4,237)		(8,053)
Fixed income investments, fair value	629,832		685,762
Collateralized loan and debt obligations
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	309,571	[1]	304,915	[2]
Fixed income investments, gross unrealized gains	754	[1]	796	[2]
Fixed income investments, gross unrealized losses	(4,307)	[1]	(3,802)	[2]
Fixed income investments, fair value	306,018	[1]	301,909	[2]
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	292,297		356,753
Fixed income investments, gross unrealized gains	1,892		585
Fixed income investments, gross unrealized losses	(1,089)		(2,839)
Fixed income investments, fair value	293,100		354,499
Fixed maturity investments
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	3,820,234		4,361,997
Fixed income investments, gross unrealized gains	83,494		32,011
Fixed income investments, gross unrealized losses	(11,249)		(34,989)
Fixed income investments, fair value	3,892,479		4,359,019
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	18,846		25,657
Fixed income investments, gross unrealized gains	3		28
Fixed income investments, gross unrealized losses	0		0
Fixed income investments, fair value	18,849		25,685
Fixed income investments
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	3,839,080		4,387,654
Fixed income investments, gross unrealized gains	83,497		32,039
Fixed income investments, gross unrealized losses	(11,249)		(34,989)
Fixed income investments, fair value	3,911,328		4,384,704
Equity investments
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost	358,911		418,822
Equity securities, gross unrealized gains	10,842		6,834
Equity securities, gross unrealized losses	(5,024)		(31,875)
Equity securities, fair value	364,729		393,781
Emerging market debt funds
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost	83,668		61,874
Equity securities, gross unrealized gains	2,499		0
Equity securities, gross unrealized losses	0		(5,453)
Equity securities, fair value	86,167		56,421
Convertible funds
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost	46,331		46,331
Equity securities, gross unrealized gains	0		0
Equity securities, gross unrealized losses	(330)		(146)
Equity securities, fair value	46,001		46,185
Preferred equity investments
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost	7,741		15,275
Equity securities, gross unrealized gains	1,542		1,946
Equity securities, gross unrealized losses	(300)		(151)
Equity securities, fair value	8,983		17,070
Short-term fixed income fund
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost	128		127
Equity securities, gross unrealized gains	2		1
Equity securities, gross unrealized losses	0		0
Equity securities, fair value	130		128
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost	496,779		542,429
Equity securities, gross unrealized gains	14,885		8,781
Equity securities, gross unrealized losses	(5,654)		(37,625)
Equity securities, fair value	506,010		513,585
Collateralized debt obligations
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, fair value	$ 4,300		$ 11,400
[1]	Balances include amounts related to collateralized debt obligations held with total fair values of $4.3 million.
[2]	Balances include amounts related to collateralized debt obligations held with total fair values of $11.4 million.

Investments (Available For Sale

Investments (Available For Sale Securities In An Unrealized Loss Position) (Details) - USD ($) $ in Thousands		Jun. 30, 2016		Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, 12 months or greater		$ (4,500)	[1]	$ (12,700)	[2]
Unrealized losses		(16,900)	[1]	(72,600)	[2]
U.S. government and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(13)	[1]	(2,175)	[2]
Fair value, less than 12 months		7,576		347,024
Unrealized losses, 12 months or greater		0	[1]	(978)	[2]
Fair value, 12 months or greater		0		16,669
Unrealized losses		(13)	[1]	(3,153)	[2]
Fair value		7,576		363,693
U.S. state and municipal securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(23)	[1]	(96)	[2]
Fair value, less than 12 months		2,084		9,662
Unrealized losses, 12 months or greater		(61)	[1]	(85)	[2]
Fair value, 12 months or greater		2,278		695
Unrealized losses		(84)	[1]	(181)	[2]
Fair value		4,362		10,357
Foreign government securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months	[2]			(404)
Fair value, less than 12 months				31,881
Unrealized losses, 12 months or greater	[2]			(177)
Fair value, 12 months or greater				3,966
Unrealized losses	[2]			(581)
Fair value				35,847
Government guaranteed corporate securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months	[2]			(7)
Fair value, less than 12 months				1,692
Unrealized losses, 12 months or greater	[2]			0
Fair value, 12 months or greater				0
Unrealized losses	[2]			(7)
Fair value				1,692
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(188)	[1]	(9,222)	[2]
Fair value, less than 12 months		39,413		830,349
Unrealized losses, 12 months or greater		(439)	[1]	(2,010)	[2]
Fair value, 12 months or greater		43,111		51,024
Unrealized losses		(627)	[1]	(11,232)	[2]
Fair value		82,524		881,373
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(349)	[1]	(3,378)	[2]
Fair value, less than 12 months		102,437		365,082
Unrealized losses, 12 months or greater		(543)	[1]	(1,763)	[2]
Fair value, 12 months or greater		69,509		79,355
Unrealized losses		(892)	[1]	(5,141)	[2]
Fair value		171,946		444,437
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(2,368)	[1]	(6,708)	[2]
Fair value, less than 12 months		169,839		436,387
Unrealized losses, 12 months or greater		(1,869)	[1]	(1,345)	[2]
Fair value, 12 months or greater		70,310		42,246
Unrealized losses		(4,237)	[1]	(8,053)	[2]
Fair value		240,149		478,633
Collateralized loan and debt obligations
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(3,138)	[1]	(3,107)	[2]
Fair value, less than 12 months		179,797		224,520
Unrealized losses, 12 months or greater		(1,169)	[1]	(695)	[2]
Fair value, 12 months or greater		79,801		48,167
Unrealized losses		(4,307)	[1]	(3,802)	[2]
Fair value		259,598		272,687
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(744)	[1]	(2,624)	[2]
Fair value, less than 12 months		79,760		311,814
Unrealized losses, 12 months or greater		(345)	[1]	(215)	[2]
Fair value, 12 months or greater		21,254		12,880
Unrealized losses		(1,089)	[1]	(2,839)	[2]
Fair value		101,014		324,694
Fixed income investments
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(6,823)	[1]	(27,721)	[2]
Fair value, less than 12 months		580,906		2,558,411
Unrealized losses, 12 months or greater		(4,426)	[1]	(7,268)	[2]
Fair value, 12 months or greater		286,263		255,002
Unrealized losses		(11,249)	[1]	(34,989)	[2]
Fair value		867,169		2,813,413
Equity investments
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(5,022)	[1]	(31,875)	[2]
Fair value, less than 12 months		83,431		283,095
Unrealized losses, 12 months or greater		(2)	[1]	0	[2]
Fair value, 12 months or greater		3		0
Unrealized losses		(5,024)	[1]	(31,875)	[2]
Fair value		83,434		283,095
Emerging market debt funds
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months	[2]			0
Fair value, less than 12 months				0
Unrealized losses, 12 months or greater	[2]			(5,453)
Fair value, 12 months or greater				56,421
Unrealized losses	[2]			(5,453)
Fair value				56,421
Convertible funds
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(330)	[1]	(146)	[2]
Fair value, less than 12 months		46,001		46,185
Unrealized losses, 12 months or greater		0	[1]	0	[2]
Fair value, 12 months or greater		0		0
Unrealized losses		(330)	[1]	(146)	[2]
Fair value		46,001		46,185
Preferred equity investments
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(244)	[1]	(151)	[2]
Fair value, less than 12 months		3,563		7,361
Unrealized losses, 12 months or greater		(56)	[1]	0	[2]
Fair value, 12 months or greater		745		0
Unrealized losses		(300)	[1]	(151)	[2]
Fair value		4,308		7,361
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(5,596)	[1]	(32,172)	[2]
Fair value, less than 12 months		132,995		336,641
Unrealized losses, 12 months or greater		(58)	[1]	(5,453)	[2]
Fair value, 12 months or greater		748		56,421
Unrealized losses		(5,654)	[1]	(37,625)	[2]
Fair value		$ 133,743		$ 393,062
[1]	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive income at June 30, 2016.
[2]	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive loss at December 31, 2015.

Investments Investments (Noncon

Investments Investments (Noncontrolling Interests Rollforward) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Non-controlling interests, beginning of period	$ 258,259		$ 267,810
Net income attributable to non-controlling interests	3,714	$ 0	12,777	$ 0
Net change in third-party investments in non-controlling interests	(367)		(9,974)
Non-controlling interests at June 30, 2016	259,851	$ 0	$ 259,851	$ 0
Blue Capital Reinsurance Holdings [Member]
Noncontrolling Interest [Line Items]
Ownership percentage			33.30%
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income attributable to non-controlling interests	1,305		$ 4,627
Net investments attributable to third-parties in BCRH	17		33
Dividends declared by BCRH attributable to non-controlling interests	(1,755)		$ (10,762)
Blue Capital Global Reinsurance Fund [Member]
Noncontrolling Interest [Line Items]
Ownership percentage			25.20%
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income attributable to non-controlling interests	2,409		$ 8,150
Net change in third-party investments in non-controlling interests	$ (384)		$ (10,007)
Blue Capital Global Reinsurance Fund [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Ownership percentage	50.00%

Fair Value Measurement (Narrati

Fair Value Measurement (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers into Level 3	$ 12,836	$ 237	$ 16,465	$ 1,970
Transfers out of Level 3	$ 482	4,886	$ 5,516	9,176
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of level 3 assets	2.00%		2.00%		2.20%
Fair Value, Inputs, Level 3 [Member] | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers into Level 3	$ 12,800		$ 16,500
Transfers out of Level 3			$ 5,500
Fair Value, Inputs, Level 3 [Member] | Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers out of Level 3				9,200
Fair Value, Inputs, Level 3 [Member] | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers into Level 3		200
Transfers out of Level 3		$ 4,900
Fair Value, Inputs, Level 3 [Member] | Collateralized loan and debt obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers into Level 3				$ 2,000
Transfers out of Level 3	$ 500

Fair Value Measurement (Schedul

Fair Value Measurement (Schedule Of Fixed Maturity Investments, Equity Securities, Short-term Investments, Derivative Instruments And Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Short-term investments	$ 314,291	$ 419,796
Other assets (see Note 7)	148,370	68,892
Total assets	7,024,082	6,963,681
Liabilities
Other liabilities (see Note 7)	76,594	46,088
Debt	769,554	737,974
Total liabilities	846,148	784,062
Fair Value, Inputs, Level 1 [Member]
Assets
Short-term investments	0	0
Other assets (see Note 7)	930	4
Total assets	225,513	312,831
Liabilities
Other liabilities (see Note 7)	1,550	0
Debt	0	0
Total liabilities	1,550	0
Fair Value, Inputs, Level 2 [Member]
Assets
Short-term investments	314,291	419,796
Other assets (see Note 7)	113,083	27,385
Total assets	6,655,187	6,496,894
Liabilities
Other liabilities (see Note 7)	53,495	4,059
Debt	769,554	737,974
Total liabilities	823,049	742,033
Fair Value, Inputs, Level 3 [Member]
Assets
Short-term investments	0	0
Other assets (see Note 7)	34,357	41,503
Total assets	143,382	153,956
Liabilities
Other liabilities (see Note 7)	21,549	42,029
Debt	0	0
Total liabilities	21,549	42,029
U.S. government and agencies securities
Assets
Fixed maturity investments	732,853	818,468
U.S. government and agencies securities | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	12,492	37,741
U.S. government and agencies securities | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	720,361	780,727
U.S. government and agencies securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	0	0
U.S. state and municipal securities
Assets
Fixed maturity investments	27,385	22,406
U.S. state and municipal securities | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	0	0
U.S. state and municipal securities | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	27,385	22,406
U.S. state and municipal securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	0	0
Foreign government securities
Assets
Fixed maturity investments	193,933	160,976
Foreign government securities | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	0	0
Foreign government securities | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	193,933	160,976
Foreign government securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	0	0
Government guaranteed corporate securities
Assets
Fixed maturity investments	47,457	57,753
Government guaranteed corporate securities | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	0	0
Government guaranteed corporate securities | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	47,457	57,753
Government guaranteed corporate securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	0	0
Corporate securities
Assets
Fixed maturity investments	1,957,382	1,849,934
Corporate securities | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	0	0
Corporate securities | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	1,850,126	1,739,002
Corporate securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	107,256	110,932
Residential mortgage-backed securities
Assets
Fixed maturity investments	1,376,822	1,311,373
Residential mortgage-backed securities | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	0	0
Residential mortgage-backed securities | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	1,376,822	1,311,373
Residential mortgage-backed securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	0	0
Commercial mortgage-backed securities
Assets
Fixed maturity investments	800,960	812,886
Commercial mortgage-backed securities | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	0	0
Commercial mortgage-backed securities | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	799,249	812,174
Commercial mortgage-backed securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	1,711	712
Collateralized loan and debt obligations
Assets
Fixed maturity investments	397,042	405,128
Collateralized loan and debt obligations | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	0	0
Collateralized loan and debt obligations | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	396,984	404,319
Collateralized loan and debt obligations | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	58	809
Asset-backed securities
Assets
Fixed maturity investments	485,245	507,255
Asset-backed securities | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	0	0
Asset-backed securities | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	485,245	507,255
Asset-backed securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	0	0
Fixed maturity investments
Assets
Fixed maturity investments	6,019,079	5,946,179
Fixed maturity investments | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	12,492	37,741
Fixed maturity investments | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	5,897,562	5,795,985
Fixed maturity investments | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	109,025	112,453
Equity investments
Assets
Equity securities	364,771	393,829
Equity investments | Fair Value, Inputs, Level 1 [Member]
Assets
Equity securities	181,386	260,330
Equity investments | Fair Value, Inputs, Level 2 [Member]
Assets
Equity securities	183,385	133,499
Equity investments | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	0	0
Emerging market debt funds
Assets
Equity securities	86,167	56,421
Emerging market debt funds | Fair Value, Inputs, Level 1 [Member]
Assets
Equity securities	0	0
Emerging market debt funds | Fair Value, Inputs, Level 2 [Member]
Assets
Equity securities	86,167	56,421
Emerging market debt funds | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	0	0
Convertible funds
Assets
Equity securities	46,001	46,185
Convertible funds | Fair Value, Inputs, Level 1 [Member]
Assets
Equity securities	0	0
Convertible funds | Fair Value, Inputs, Level 2 [Member]
Assets
Equity securities	46,001	46,185
Convertible funds | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	0	0
Preferred equity investments
Assets
Equity securities	14,698	17,623
Preferred equity investments | Fair Value, Inputs, Level 1 [Member]
Assets
Equity securities	0	0
Preferred equity investments | Fair Value, Inputs, Level 2 [Member]
Assets
Equity securities	14,698	17,623
Preferred equity investments | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	0	0
Short-term fixed income fund
Assets
Equity securities	30,705	14,756
Short-term fixed income fund | Fair Value, Inputs, Level 1 [Member]
Assets
Equity securities	30,705	14,756
Short-term fixed income fund | Fair Value, Inputs, Level 2 [Member]
Assets
Equity securities	0	0
Short-term fixed income fund | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	0	0
Equity securities
Assets
Equity securities	542,342	528,814
Equity securities | Fair Value, Inputs, Level 1 [Member]
Assets
Equity securities	212,091	275,086
Equity securities | Fair Value, Inputs, Level 2 [Member]
Assets
Equity securities	330,251	253,728
Equity securities | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	$ 0	$ 0

Fair Value Measurement (Quantit

Fair Value Measurement (Quantitative Information Used As Level 3 Inputs) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Derivatives recorded in other assets, fair value	$ 148,370		$ 68,892
Derivatives recorded in other liabilities, fair value	76,594		46,088
Net weather and energy related derivative assets and liabilities	71,776		22,804
Energy Related Derivative [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Derivatives recorded in other assets, fair value	35,287		41,507
Derivatives recorded in other liabilities, fair value	23,099		42,029
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Derivatives recorded in other assets, fair value	34,357		41,503
Derivatives recorded in other liabilities, fair value	21,549		42,029
Fair Value, Inputs, Level 3 [Member] | Energy Related Derivative [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Derivatives recorded in other assets, fair value	35,300		41,500
Derivatives recorded in other liabilities, fair value	23,100		42,000
Net weather and energy related derivative assets and liabilities	$ 12,808		$ (526)
Fair Value, Inputs, Level 3 [Member] | Simulation Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Correlation	1	1
Temperature	115F	115F
Composite Weather Variable	45 deg.	45 deg.
Rainfall	2"	2"
Windspeed	25 m/s	25 m/s
Fair Value Inputs Wave Height	25 m
Fair Value Inputs Snowfall		18"
Fair Value Inputs Cyclone Category		5
Commodity curve	$ 14,200	$ 13,000
Fair Value, Inputs, Level 3 [Member] | Simulation Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Correlation	0	0
Temperature	-15F	-15F
Composite Weather Variable	-25 deg.	-25 deg.
Rainfall	0"	0"
Windspeed	0.01 m/s	0.01 m/s
Fair Value Inputs Wave Height	0 m
Fair Value Inputs Snowfall		0"
Fair Value Inputs Cyclone Category		0
Commodity curve	$ (1,000)	$ 0

Fair Value Measurement (Reconci

Fair Value Measurement (Reconciliation Of The Beginning And Ending Balances For Fixed Maturity Investments, Other Assets and Other Liabilities Measured At Fair Value On A Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Level 3, beginning of period	$ 138,772	$ 24,723	$ 153,956	$ 37,905
Total realized and unrealized gains included in earnings	1,133		2,316	113
Total realized and unrealized losses included in earnings	(300)	(2)	(2,347)	(11)
Total income included in other underwriting income (loss)	(226)	3,499	3,548	5,595
Total loss included in other underwriting income (loss)	(3,864)	(4,152)	(7,782)	(12,994)
Change in unrealized gains included in other comprehensive income (loss)	94	18	324	24
Change in unrealized losses included in other comprehensive income (loss)	(260)	(64)	(75)	(193)
Purchases	1,003		1,674	0
Issues	10,894	9,121	13,586	12,333
Sales	(13,800)	(96)	(16,269)	(310)
Settlements	(2,418)	0	(16,498)	(6,858)
Transfers into Level 3	12,836	237	16,465	1,970
Transfers out of Level 3	(482)	(4,886)	(5,516)	(9,176)
Level 3, end of period	143,382	28,398	143,382	28,398
Fixed Maturity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Level 3, beginning of period	108,801	9,500	112,453	12,290
Total realized and unrealized gains included in earnings	1,133		2,316	113
Total realized and unrealized losses included in earnings	(300)	(2)	(2,347)	(11)
Total income included in other underwriting income (loss)	0	0	0	0
Total loss included in other underwriting income (loss)	0	0	0	0
Change in unrealized gains included in other comprehensive income (loss)	94	18	324	24
Change in unrealized losses included in other comprehensive income (loss)	(260)	(64)	(75)	(193)
Purchases	1,003		1,674	0
Issues	0	0	0	0
Sales	(13,800)	(96)	(16,269)	(310)
Settlements	0	0	0	0
Transfers into Level 3	12,836	237	16,465	1,970
Transfers out of Level 3	(482)	(4,886)	(5,516)	(9,176)
Level 3, end of period	109,025	4,707	109,025	4,707
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Level 3, beginning of period	29,971	15,223	41,503	25,615
Total realized and unrealized gains included in earnings	0		0	0
Total realized and unrealized losses included in earnings	0	0	0	0
Total income included in other underwriting income (loss)	(226)	3,499	3,548	5,595
Total loss included in other underwriting income (loss)	(3,864)	(4,152)	(7,782)	(12,994)
Change in unrealized gains included in other comprehensive income (loss)		0	0	0
Change in unrealized losses included in other comprehensive income (loss)		0	0	0
Purchases	0		0	0
Issues	10,894	9,121	13,586	12,333
Sales	0	0	0	0
Settlements	(2,418)	0	(16,498)	(6,858)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Level 3, end of period	34,357	23,691	34,357	23,691
Other Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Level 3, beginning of period	(30,419)	(17,385)	(42,029)	(35,366)
Total realized and unrealized gains included in earnings	0		0	0
Total realized and unrealized losses included in earnings	0	0	0	0
Total income included in other underwriting income (loss)	5,492	7,806	11,119	20,865
Total loss included in other underwriting income (loss)	804	(3,691)	(5,356)	(7,220)
Change in unrealized gains included in other comprehensive income (loss)	0	0	0	0
Change in unrealized losses included in other comprehensive income (loss)	0	0	0	0
Purchases	0		0	0
Issues	(14,652)	(12,324)	(18,745)	(18,748)
Sales	0	0	0	0
Settlements	17,226	3,410	33,462	18,285
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Level 3, end of period	$ (21,549)	$ (22,184)	$ (21,549)	$ (22,184)

Earnings Per Share Earnings Per

Earnings Per Share Earnings Per Share (Narrative) (Details) - Series B Preferred Stock [Member]	Jun. 01, 2016$ / sharesshares
Stock Redeemed or Called During Period, Shares | shares	9,200,000
Preferred Stock, Redemption Price Per Share | $ / shares	$ 25

Earnings Per Share (Schedule Of

Earnings Per Share (Schedule Of Computing Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income available to common and participating common shareholders		$ 76,621	$ 76,018	$ 182,999	$ 176,309
Less amount allocated to participating common shareholders	[1]	(1,634)	(2,273)	(4,008)	(5,237)
Net income allocated to common shareholders		$ 74,987	$ 73,745	$ 178,991	$ 171,072
Weighted average shares - basic		65,965,153	43,736,541	65,786,270	43,640,052
Weighted average shares - diluted		66,057,211	43,896,721	65,875,271	43,792,626
Basic earnings per common share		$ 1.14	$ 1.69	$ 2.72	$ 3.92
Diluted earnings per common share		$ 1.14	$ 1.68	$ 2.72	$ 3.91
Employee Stock Option [Member]
Share equivalents		61,739	150,384	61,267	148,204
Restricted Stock [Member]
Share equivalents		30,319	9,796	27,734	4,370
[1]	Represents earnings attributable to holders of unvested restricted shares and restricted share units issued under the Company's equity compensation plan that are considered participating. In periods of loss, no losses are allocated to participating common shareholders (unvested restricted shares and restricted share units).

Earnings Per Share (Schedule 49

Earnings Per Share (Schedule Of Dividends Declared) (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Dividends Declared [Line Items]
Dividends declared per common share	$ 0.38	$ 0.35	$ 0.76	$ 0.70
Series A Preferred Stock [Member]
Dividends Declared [Line Items]
Dividends declared per preferred share	0	0.484375	0	0.968750
Series B Preferred Stock [Member]
Dividends Declared [Line Items]
Dividends declared per preferred share	0.395830	0.468750	0.864580	0.937500
Series C Preferred Stock [Member]
Dividends Declared [Line Items]
Dividends declared per preferred share	$ 396.8750	$ 0	$ 886.3542	$ 0

Accumulated Other Comprehensi50

Accumulated Other Comprehensive Income (Schedule Of Changes In Accumulated Other Comprehensive Income By Component) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income [Line Items]
Beginning balance		$ (1,172)	$ 77,759	$ (46,634)	$ 76,706
Other comprehensive income (loss) before reclassifications		(1,309)	(31,508)	41,867	(14,232)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	22,430	(9,286)	24,716	(25,509)
Other comprehensive income (loss)		21,121	(40,794)	66,583	(39,741)
Ending balance		19,949	36,965	19,949	36,965
Gains and losses on cash flow hedges [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning balance		(1,656)	(1,744)	(1,678)	(1,766)
Other comprehensive income (loss) before reclassifications		0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	22	22	44	44
Other comprehensive income (loss)		22	22	44	44
Ending balance		(1,634)	(1,722)	(1,634)	(1,722)
Unrealized gains on available for sale securities [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning balance		45,120	110,589	(12,638)	86,100
Other comprehensive income (loss) before reclassifications		36,429	(57,671)	91,923	(16,937)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	22,408	(9,308)	24,672	(25,553)
Other comprehensive income (loss)		58,837	(66,979)	116,595	(42,490)
Ending balance		103,957	43,610	103,957	43,610
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning balance		(44,636)	(31,086)	(32,318)	(7,628)
Other comprehensive income (loss) before reclassifications		(37,738)	26,163	(50,056)	2,705
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	0	0	0	0
Other comprehensive income (loss)		(37,738)	26,163	(50,056)	2,705
Ending balance		$ (82,374)	$ (4,923)	$ (82,374)	$ (4,923)
[1]	All amounts are net of tax.

Accumulated Other Comprehensi51

Accumulated Other Comprehensive Income (Schedule Of Reclassifications Out Of Accumulated Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 11,357	$ 9,062	$ 22,227	$ 18,121
Net realized and unrealized (gains) losses	(6,347)	(9,680)	(20,134)	(27,869)
Net impairment losses recognized in earnings	9,841	424	10,464	1,073
Total before income taxes	(86,490)	(85,718)	(209,901)	(197,987)
Income tax (benefit) expense	(1,138)	1,512	(2,371)	5,302
Total net of income taxes	(83,914)	(84,206)	(199,495)	(192,685)
Gains and losses on cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	22	22	44	44
Total before income taxes	22	22	44	44
Income tax (benefit) expense	0	0	0	0
Total net of income taxes	22	22	44	44
Unrealized gains on available for sale securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized and unrealized (gains) losses	12,219	(9,589)	14,096	(27,359)
Net impairment losses recognized in earnings	9,841	424	10,464	1,073
Total before income taxes	22,060	(9,165)	24,560	(26,286)
Income tax (benefit) expense	348	(143)	112	733
Total net of income taxes	$ 22,408	$ (9,308)	$ 24,672	$ (25,553)

Derivatives (Schedule Of Deriva

Derivatives (Schedule Of Derivative Fair Value And Notional Amount) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	$ 148,370	$ 68,892
Derivatives recorded in other liabilities, fair value	76,594	46,088
Net derivative asset, fair value	71,776	22,804
Securities for Reverse Repurchase Agreements	0	30,000
Derivative assets traded under master netting agreements	148,400	68,900
Derivative liabilities traded under master netting agreements	$ 76,600	46,100
Maximum [Member]
Derivatives, Fair Value [Line Items]
Original term of credit default swap, in years	5 years
Minimum [Member]
Derivatives, Fair Value [Line Items]
Required Collateral Percentage	102.00%
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	$ 643	425
Derivatives recorded in other liabilities, fair value	770	372
Derivatives recorded in other assets, notional principal amount	32,735	38,818
Derivatives recorded in other liabilities, notional principal amount	31,116	30,400
Credit Default Swap [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	135	36
Derivatives recorded in other liabilities, fair value	174	276
Derivatives recorded in other assets, notional principal amount	4,999	4,225
Derivatives recorded in other liabilities, notional principal amount	5,166	7,800
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other liabilities, fair value	70	7
Derivatives recorded in other liabilities, notional principal amount	42,000	42,000
Interest Rate Future [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other liabilities, fair value	0	8
Derivatives recorded in other liabilities, notional principal amount	0	54,488
Interest Rate Swaption [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	0	0
Derivatives recorded in other assets, notional principal amount	125,500	0
Industry Loss Warranty [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	3,906	0
Derivatives recorded in other liabilities, fair value	1,346	259
Derivatives recorded in other assets, notional principal amount	20,000	0
Derivatives recorded in other liabilities, notional principal amount	14,209	19,500
LIBOR Swap [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other liabilities, fair value	345	233
Derivatives recorded in other liabilities, notional principal amount	$ 100,000	100,000
Fixed interest rate percentage	4.905%
Term of LIBOR swap	5 years
TBA [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	$ 108,399	26,924
Derivatives recorded in other liabilities, fair value	47,431	0
Derivatives recorded in other assets, notional principal amount	103,300	25,700
Derivatives recorded in other liabilities, notional principal amount	45,200	0
Loss Development Cover [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other liabilities, fair value	3,359	2,904
Derivatives recorded in other liabilities, notional principal amount	23,807	22,322
Energy and weather contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	35,287	41,507
Derivatives recorded in other liabilities, fair value	23,099	42,029
Derivatives recorded in other assets, notional principal amount	92,211	70,388
Derivatives recorded in other liabilities, notional principal amount	$ 144,186	$ 148,325

Derivatives (Schedule Of Deri53

Derivatives (Schedule Of Derivative Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative [Line Items]
Total gains included in net realized and unrealized gains	$ 196	$ 91	$ 526	$ 510
Total gains (losses) included in other underwriting income (loss)	1,418	3,258	(164)	6,042
Total gains (losses) from derivatives	1,651	3,006	(139)	7,678
Foreign Exchange Forward [Member]
Derivative [Line Items]
Total gains (losses) included in net foreign exchange (gains) losses from foreign exchange forward contracts	37	(343)	(501)	1,126
Interest Rate Future [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	55	(27)	(227)	95
Credit Default Swap [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	(112)	9	(82)	9
Interest Rate Swap [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	3	320	(48)	(235)
Interest Rate Swaption [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	(14)	0	(27)	28
Industry Loss Warranty [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	(244)	0	60	0
LIBOR Swap [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	32	0	(112)	0
TBA [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	476	(211)	962	613
Energy and weather contracts [Member]
Derivative [Line Items]
Total gains (losses) included in other underwriting income (loss)	2,037	3,258	1,322	6,042
Loss Development Cover [Member]
Derivative [Line Items]
Total gains (losses) included in other underwriting income (loss)	$ (619)	$ 0	$ (1,486)	$ 0

Stock-Based Employee Compensa54

Stock-Based Employee Compensation And Other Stock Plans (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised	$ 3,200,000		$ 3,200,000
Proceeds from stock options exercised	$ 7,700,000		$ 7,700,000
Restricted shares and RSUs, grants in period	53,795	31,690	613,967	504,352
Restricted shares and RSUs weighted average grant date fair value	$ 3,500,000	$ 2,000,000	$ 36,900,000	$ 30,000,000
Aggregate fair value of restricted shares and RSUs vested	8,200,000	7,800,000	41,200,000	21,600,000
Expenses related to employee stock purchase plan	$ 116,000	$ 79,000	$ 216,000	$ 144,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	0	0	0	0
Number of options expired	0	0	0	0
Number of options vested	160,000	160,000	160,000	160,000
Number of options exercised	160,000	0	160,000	0
Compensation costs recognized in earnings	$ 200,000	$ 500,000	$ 500,000	$ 1,000,000
Compensation costs not yet recognized - stock options	500,000	1,600,000	500,000	1,600,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs recognized in earnings	9,400,000	7,600,000	19,200,000	16,900,000
Compensation costs not yet recognized - restricted stock	$ 41,200,000	$ 34,000,000	$ 41,200,000	$ 34,000,000

Segment Reporting (Summary Of T

Segment Reporting (Summary Of The Segment Revenues, Results And Reserve For Losses And Loss Expenses) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Gross premiums written		$ 1,136,930	$ 861,184	$ 2,748,607	$ 2,162,616
Ceded premiums written		(419,162)	(302,101)	(1,091,997)	(838,579)
Net premiums written		717,768	559,083	1,656,610	1,324,037
Net premiums earned		599,608	458,135	1,152,799	847,994
Other underwriting income (loss)		930	1,389	(1,514)	3,795
Total underwriting revenue		600,538	459,524	1,151,285	851,789
Net losses and loss expenses		376,112	239,122	619,440	411,058
Acquisition expenses		111,961	84,971	215,803	167,064
General and administrative expenses		55,079	54,965	127,304	109,855
Total underwriting expenses		543,152	379,058	962,547	687,977
Underwriting income		57,386	80,466	188,738	163,812
Net investment income		43,977	32,252	55,158	74,113
Corporate expenses		(11,830)	(12,634)	(23,601)	(24,902)
Net foreign exchange gains (losses)		32,751	(12,981)	44,480	(20,533)
Net realized and unrealized gains		6,347	9,680	20,134	27,869
Net impairment losses recognized in earnings		(9,841)	(424)	(10,464)	(1,073)
Amortization of intangibles		(20,943)	(1,579)	(42,317)	(3,178)
Interest expense		(11,357)	(9,062)	(22,227)	(18,121)
Income before income taxes		$ 86,490	$ 85,718	$ 209,901	$ 197,987
Net loss ratio		62.70%	52.20%	53.70%	48.50%
Acquisition expense ratio		18.70%	18.50%	18.70%	19.70%
General and administrative expense ratio	[1]	11.20%	14.80%	13.10%	15.90%
Combined ratio		92.60%	85.50%	85.50%	84.10%
Reserve for losses and loss expenses		$ 4,727,997	$ 3,833,525	$ 4,727,997	$ 3,833,525	$ 4,510,415
Insurance [Member]
Segment Reporting Information [Line Items]
Gross premiums written		593,706	468,866	1,428,823	1,205,084
Ceded premiums written		(354,104)	(278,567)	(818,277)	(710,746)
Net premiums written		239,602	190,299	610,546	494,338
Net premiums earned		253,784	201,460	473,353	337,324
Other underwriting income (loss)		0	0	0	0
Total underwriting revenue		253,784	201,460	473,353	337,324
Net losses and loss expenses		173,858	145,483	301,661	219,995
Acquisition expenses		32,868	17,702	63,226	33,585
General and administrative expenses		29,825	28,567	68,254	57,409
Total underwriting expenses		236,551	191,752	433,141	310,989
Underwriting income		$ 17,233	$ 9,708	$ 40,212	$ 26,335
Net loss ratio		68.40%	72.20%	63.70%	65.20%
Acquisition expense ratio		13.00%	8.80%	13.40%	10.00%
General and administrative expense ratio		11.80%	14.20%	14.40%	17.00%
Combined ratio		93.20%	95.20%	91.50%	92.20%
Reserve for losses and loss expenses		$ 2,642,594	$ 2,157,769	$ 2,642,594	$ 2,157,769
Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross premiums written		543,224	392,318	1,319,784	957,532
Ceded premiums written		(65,058)	(23,534)	(273,720)	(127,833)
Net premiums written		478,166	368,784	1,046,064	829,699
Net premiums earned		345,824	256,675	679,446	510,670
Other underwriting income (loss)		930	1,389	(1,514)	3,795
Total underwriting revenue		346,754	258,064	677,932	514,465
Net losses and loss expenses		202,254	93,639	317,779	191,063
Acquisition expenses		79,093	67,269	152,577	133,479
General and administrative expenses		25,254	26,398	59,050	52,446
Total underwriting expenses		306,601	187,306	529,406	376,988
Underwriting income		$ 40,153	$ 70,758	$ 148,526	$ 137,477
Net loss ratio		58.50%	36.50%	46.70%	37.40%
Acquisition expense ratio		22.90%	26.20%	22.50%	26.10%
General and administrative expense ratio		7.30%	10.30%	8.70%	10.30%
Combined ratio		88.70%	73.00%	77.90%	73.80%
Reserve for losses and loss expenses		$ 2,085,403	$ 1,675,756	$ 2,085,403	$ 1,675,756
[1]	Total general and administrative expense ratio includes general and administrative expenses and corporate expenses.

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Gross And Net Premiums Written By Line Of Business) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue from External Customer [Line Items]
Gross premiums written	$ 1,136,930	$ 861,184	$ 2,748,607	$ 2,162,616
Net premiums written	717,768	559,083	1,656,610	1,324,037
Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	593,706	468,866	1,428,823	1,205,084
Net premiums written	239,602	190,299	610,546	494,338
Agriculture Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	66,922	112,012	563,138	628,928
Net premiums written	(2,962)	22,677	205,665	225,137
Casualty And Other Specialty Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	178,081	146,056	316,336	246,738
Net premiums written	77,965	65,302	141,462	110,360
Professional Lines Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	122,679	96,736	200,094	151,496
Net premiums written	51,204	43,443	94,538	67,674
Property, Marine Energy and Aviation Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	226,024	114,062	349,255	177,922
Net premiums written	113,395	58,877	168,881	91,167
Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	543,224	392,318	1,319,784	957,532
Net premiums written	478,166	368,784	1,046,064	829,699
Catastrophe Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	236,995	139,833	437,825	264,240
Net premiums written	197,681	122,305	286,549	175,765
Property Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	30,646	30,560	187,112	156,260
Net premiums written	31,304	30,118	181,360	153,567
Casualty Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	82,263	48,132	180,983	106,230
Net premiums written	80,921	48,132	179,640	106,230
Professional Lines Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	135,638	134,241	184,187	178,098
Net premiums written	135,031	134,241	183,251	178,098
Specialty Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	57,682	39,552	329,677	252,704
Net premiums written	$ 33,229	$ 33,988	$ 215,264	$ 216,039

Commitments And Contingencies57

Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Reinsurance Recoverables	$ 1,453.8	$ 1,196
Collateral held related to ceded reinsurance agreements	464.3	321.5
Amount of letters of credit outstanding	283.8	341.6
Securities pledged as collateral obligation	114.5	108.9
Cash and investments pledged under letters of credit facility	$ 327.6	$ 383.3

Commitments And Contingencies58

Commitments And Contingencies (Schedule Of Percentage Of Gross Premiums Written) (Details)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Revenue from External Customer [Line Items]
Percentage of gross premium written	45.80%	53.30%
Aon Benfield [Member]
Revenue from External Customer [Line Items]
Percentage of gross premium written	14.50%	16.20%
Willis Companies [Member]
Revenue from External Customer [Line Items]
Percentage of gross premium written	9.40%	10.50%
Marsh & Mclennan Companies, Inc. [Member]
Revenue from External Customer [Line Items]
Percentage of gross premium written	21.90%	26.60%

Commitments And Contingencies59

Commitments And Contingencies (Deposits) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
UNITED STATES [Member]
Statutory Accounting Practices [Line Items]
Assets Held by Insurance Regulators	$ 211.4	$ 208.3

Commitments And Contingencies60

Commitments And Contingencies (Assets Held In Trust) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Blue Water Re Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	$ 429.8	$ 438.9
Blue Water Re [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	183.8	195.3
Blue Capital Re ILS Trusts [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	3.4	5.2
Endurance Reinsurance Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	770.5	94.1
Reduced Collateral Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	18.7	10.8
MUSIC Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	22	21.3
Lloyd's Capital Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	280.6	276.8
Lloyd's Premiums Trust Funds [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	$ 207.3	$ 231.9

Commitments And Contingencies61

Commitments And Contingencies (Lloyd's New Central Fund) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016USD ($)
Commitments and Contingencies Disclosure [Abstract]
Levy Imposed As Percentage Of Premiums Written	0.35%
Additional Contribution As Percentage Of Underwriting Capacity Maximum	3.00%
Estimated Obligation To Central Fund For Annual Contribution	$ 1.1
Annual Subscription Charge As Percentage Of Premium Written	0.45%
Estimated Obligation For Annual Subscription Charges	$ 1.5

Commitments And Contingencies62

Commitments And Contingencies (Credit Agreements) (Details) - USD ($) $ in Millions	May 06, 2016	May 15, 2015	Jun. 30, 2016	Jun. 30, 2016	Mar. 23, 2016	Dec. 31, 2015	Apr. 19, 2012
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 450		$ 700
Blue Capital Reinsurance Holdings [Member]
Line of Credit Facility [Line Items]
Term of facility		364 days
Maximum borrowing capacity	$ 20	$ 20
Line Of Credit Facility Percentage Of Annual Guarantee Fee		0.125%
Outstanding borrowings			$ 0	$ 0		$ 13
Debt Instrument, Basis Spread on Variable Rate	1.50%
Blue Capital Reinsurance Holdings [Member] | Due February 2 2016 [Member]
Line of Credit Facility [Line Items]
Repayments of Short-term Debt			$ 4
Annual interest rate			1.33%
Blue Capital Reinsurance Holdings [Member] | Due February 22 2016 [Member]
Line of Credit Facility [Line Items]
Repayments of Short-term Debt			$ 5
Annual interest rate				1.48%
Blue Capital Reinsurance Holdings [Member] | Due March 11 2016 [Member]
Line of Credit Facility [Line Items]
Repayments of Short-term Debt				$ 4
Annual interest rate				1.51%
Blue Capital Reinsurance Holdings [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings			0	$ 0
Blue Capital Global Reinsurance Fund [Member]
Line of Credit Facility [Line Items]
Term of facility		364 days
Maximum borrowing capacity	$ 20	$ 20
Line Of Credit Facility Percentage Of Annual Guarantee Fee		0.125%
Outstanding borrowings			0	0		$ 6
Debt Instrument, Basis Spread on Variable Rate	1.50%
Blue Capital Global Reinsurance Fund [Member] | Due February 1, 2016 [Member]
Line of Credit Facility [Line Items]
Repayments of Short-term Debt				$ 3
Annual interest rate				1.54%
Blue Capital Global Reinsurance Fund [Member] | Due February 12, 2016 [Member]
Line of Credit Facility [Line Items]
Repayments of Short-term Debt				$ 3
Annual interest rate				1.51%
Blue Capital Global Reinsurance Fund [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings			$ 0	$ 0

Commitments And Contingencies63

Commitments And Contingencies (Schedule Of Future Minimum Lease Commitments) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
2,017	$ 16,162
2,018	16,411
2,019	15,503
2,020	15,173
2,021	13,981
2022 and thereafter	20,503
Total	97,733
Total lease expenses under operating leases	$ 6,600	$ 6,400

Debt And Financing Arrangemen64

Debt And Financing Arrangements (Details) - USD ($) $ in Millions	Mar. 23, 2016	Jun. 30, 2016	Dec. 31, 2015	Apr. 19, 2012
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 450			$ 700
Amount of letters of credit outstanding		$ 283.8	$ 341.6
Increase to credit facility		$ 100
Used capacity fee percentage		0.40%
Commitment fee percentage		0.125%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Term of facility	5 years
Amount of letters of credit outstanding		$ 272.9	$ 329.9
Maximum [Member]
Line of Credit Facility [Line Items]
Leverage ratio		35.00%