Endurance Specialty (ENH) 10-Q 9 May 16 2016 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 02, 2016
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
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		67,367,383

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Fixed maturity investments, trading at fair value (amortized cost: $1,910,938 and $1,611,079 at March 31, 2016 and December 31, 2015, respectively)	$ 1,902,271	$ 1,587,160
Fixed maturity investments, available for sale at fair value (amortized cost: $4,214,639 and $4,361,997 at March 31, 2016 and December 31, 2015, respectively)	4,261,560	4,359,019
Short-term investments, trading at fair value (amortized cost: $121,736 and $394,096 at March 31, 2016 and December 31, 2015, respectively)	121,740	394,111
Short-term investments, available for sale at fair value (amortized cost: $25,473 and $25,657 at March 31, 2016 and December 31, 2015, respectively)	25,481	25,685
Equity securities, trading at fair value (cost: $33,017 and $15,290 at March 31, 2016 and December 31, 2015, respectively)	32,510	15,229
Equity securities, available for sale at fair value (cost: $578,351 and $542,429 at March 31, 2016 and December 31, 2015, respectively)	551,968	513,585
Other investments	799,123	872,617
Total investments	7,694,653	7,767,406
Cash and cash equivalents	1,212,733	1,177,750
Premiums receivable, net	1,900,768	1,376,328
Insurance and reinsurance balances receivable	103,848	102,403
Deferred acquisition costs	321,654	255,501
Prepaid reinsurance premiums	891,268	498,574
Reinsurance recoverable on unpaid losses	935,593	907,944
Reinsurance recoverable on paid losses	330,951	288,026
Accrued investment income	29,556	30,213
Goodwill and intangible assets	532,589	553,960
Deferred tax asset	58,342	64,164
Net receivable on sales of investments	61,006	31,873
Other assets	209,225	187,383
Total assets	14,282,186	13,241,525
LIABILITIES
Reserve for losses and loss expenses	4,458,189	4,510,415
Reserve for unearned premiums	2,565,405	1,789,148
Deposit liabilities	13,112	13,674
Reinsurance balances payable	855,257	661,213
Debt	703,994	717,650
Net payable on purchases of investments	120,009	63,442
Deferred tax liability	16,532	17,315
Other liabilities	308,072	344,596
Total liabilities	$ 9,040,570	$ 8,117,453
Commitments and contingent liabilities
SHAREHOLDERS' EQUITY
Preferred shares, total liquidation preference $460,000 (2015 - $460,000)	$ 9,209	$ 9,209
Common shares, ordinary - 67,349,582 issued and outstanding (2015 - 66,797,991)	67,350	66,798
Additional paid-in capital	2,146,171	2,145,836
Accumulated other comprehensive loss	(1,172)	(46,634)
Retained earnings	2,761,799	2,681,053
Total shareholders' equity available to Endurance Holdings	4,983,357	4,856,262
Non-controlling interests	258,259	267,810
Total shareholders' equity	5,241,616	5,124,072
Total liabilities and shareholders' equity	$ 14,282,186	$ 13,241,525

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investments [Abstract]
Fixed maturity investments, trading, amortized cost	$ 1,910,938	$ 1,611,079
Fixed maturity investments, available for sale, amortized cost	4,214,639	4,361,997
Short-term investments, trading, amortized cost	121,736	394,096
Short-term investments, available for sale, amortized cost	25,473	25,657
Equity securities, trading, cost	33,017	15,290
Equity securities, available for sale, cost	578,351	542,429
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, aggregate liquidation preference	$ 460,000	$ 460,000
Common stock, shares issued	67,349,582	66,797,991
Common stock, shares outstanding	67,349,582	66,797,991

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements Of Income And Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Gross premiums written	$ 1,611,677	$ 1,301,432
Ceded premiums written	(672,835)	(536,478)
Net premiums written	938,842	764,954
Change in unearned premiums	(385,651)	(375,095)
Net premiums earned	553,191	389,859
Net investment income	11,181	41,861
Net realized and unrealized gains	13,787	18,189
Net impairment losses recognized in earnings	(623)	(649)
Other underwriting (loss) income	(2,444)	2,406
Total revenues	575,092	451,666
Expenses
Net losses and loss expenses	243,328	171,936
Acquisition expenses	103,842	82,093
General and administrative expenses	72,225	54,890
Corporate expenses	11,771	12,268
Amortization of intangibles	21,374	1,599
Net foreign exchange (gains) losses	(11,729)	7,552
Interest expense	10,870	9,059
Total expenses	451,681	339,397
Income before income taxes	123,411	112,269
Income tax benefit (expense)	1,233	(3,790)
Net income	124,644	108,479
Net income attributable to non-controlling interests	(9,063)	0
Net income available to Endurance Holdings	115,581	108,479
Preferred dividends	(9,203)	(8,188)
Net income available to Endurance Holdings' common and participating common shareholders	106,378	100,291
Comprehensive income
Net income	124,644	108,479
Other comprehensive income
Net unrealized holding gains on investments arising during the period (net of other-than-temporary impairment losses recognized in other comprehensive income, reclassification adjustment and applicable deferred income taxes of ($6,881) and ($2,022) for the three months ended March 31, 2016 and 2015, respectively)	57,758	24,489
Foreign currency translation adjustments	(12,318)	(23,458)
Reclassification adjustment for net losses on derivative designated as cash flow hedge included in net income	22	22
Other comprehensive income	45,462	1,053
Comprehensive income	170,106	109,532
Comprehensive income attributable to non-controlling interests	(9,063)	0
Comprehensive income attributable to Endurance Holdings	$ 161,043	$ 109,532
Per share data
Basic earnings per common share	$ 1.58	$ 2.24
Diluted earnings per common share	1.58	2.23
Dividend per common share	$ 0.38	$ 0.35

Unaudited Condensed Consolidat5

Unaudited Condensed Consolidated Statements Of Income And Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Other comprehensive income, net unrealized holding gains on investments arising during the period, tax	$ (6,881)	$ (2,022)

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
Issuance of common shares, net of forfeitures			356	79
Settlement of equity awards				(6,092)
Stock-based compensation expense				9,773
Foreign currency translation adjustments	$ (23,458)				(23,458)
Net unrealized holding gains arising during the period, net of other-than-temporary impairment losses and reclassification adjustment	24,489					24,489
Net change from current period hedging transactions, net of reclassification adjustment							22
Net income	108,479								108,479
Net income attributable to non-controlling interests	0								0
Dividends on preferred shares	(8,188)								(8,188)
Dividends on common shares									(15,796)
Balance, end of period at Mar. 31, 2015	3,274,846	17,200	45,121	601,986	(31,086)	110,589	(1,744)	$ 77,759	2,532,780
Non-controlling interests	0
Total shareholders' equity	3,274,846
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
Issuance of common shares, net of forfeitures			552	1,055
Settlement of equity awards				(10,735)
Stock-based compensation expense				10,015
Foreign currency translation adjustments	(12,318)				(12,318)
Net unrealized holding gains arising during the period, net of other-than-temporary impairment losses and reclassification adjustment	57,758					57,758
Net change from current period hedging transactions, net of reclassification adjustment							22
Net income	124,644								124,644
Net income attributable to non-controlling interests	9,063								(9,063)
Dividends on preferred shares	(9,203)								(9,203)
Dividends on common shares									(25,632)
Balance, end of period at Mar. 31, 2016	4,983,357	$ 9,209	$ 67,350	$ 2,146,171	$ (44,636)	$ 45,120	$ (1,656)	$ (1,172)	$ 2,761,799
Non-controlling interests	258,259
Total shareholders' equity	$ 5,241,616

Unaudited Condensed Consolidat7

Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows used in operating activities
Net income	$ 124,644	$ 108,479
Adjustments to reconcile net income to net cash used in operating activities:
Amortization of net premium on investments	10,460	12,496
Amortization of other intangibles and depreciation	26,880	6,210
Net realized and unrealized gains	(13,787)	(18,189)
Net impairment losses recognized in earnings	623	649
Deferred taxes	(1,842)	3,868
Stock-based compensation expense	10,015	9,773
Equity in earnings of other investments	28,257	(12,388)
Premiums receivable, net	(524,440)	(562,755)
Insurance and reinsurance balances receivable	(1,445)	12,669
Deferred acquisition costs	(66,153)	(51,385)
Prepaid reinsurance premiums	(392,694)	(337,526)
Reinsurance recoverable on unpaid losses	(27,649)	64,986
Reinsurance recoverable on paid losses	(42,925)	81,649
Accrued investment income	657	4,018
Other assets	10,312	8,417
Reserve for losses and loss expenses	(52,226)	(225,131)
Reserve for unearned premiums	776,257	709,788
Deposit liabilities	(562)	(1,414)
Reinsurance balances payable	194,044	126,628
Other liabilities	(88,810)	(33,144)
Net cash flows used in operating activities	(30,384)	(92,302)
Cash flows provided by investing activities
Proceeds from sales and maturities of trading investments	753,987	0
Proceeds from sales and maturities of available for sale investments	964,133	1,555,599
Proceeds from the redemption of other investments	86,713	17,189
Purchases of trading investments	(780,573)	0
Purchases of available for sale investments	(852,752)	(1,478,073)
Purchases of other investments	(39,162)	(39,321)
Net settlements of other assets	860	(456)
Purchases of fixed assets	(2,385)	(3,526)
Net cash paid upon subsidiary acquisition	(3)	(10)
Net cash flows provided by investing activities	130,818	51,402
Cash flows used in financing activities
Issuance of common shares	566	370
Net contributions to non-controlling interests	(16,859)	0
Settlement of equity awards	(10,735)	(6,092)
Offering and registration costs paid	(258)	0
Proceeds from issuance of debt	178	235
Repayments of debt	(13,199)	(226)
Dividends on preferred shares	(9,203)	(8,188)
Dividends on common shares	(25,578)	(15,771)
Net cash flows used in financing activities	(75,088)	(29,672)
Effect of exchange rate changes on cash and cash equivalents	9,637	(17,706)
Net increase (decrease) in cash and cash equivalents	34,983	(88,278)
Cash and cash equivalents, beginning of period	1,177,750	745,472
Cash and cash equivalents, end of period	$ 1,212,733	$ 657,194

General

General	3 Months Ended
	Mar. 31, 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 the 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 25.1% 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	3 Months Ended
	Mar. 31, 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 accounting principles generally accepted in the United States 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 months ended March 31, 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 accounting principles generally accepted in the United States 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.

Investments

Investments	3 Months Ended
	Mar. 31, 2016
Investments [Abstract]
Investments	3. Investments Net Investment Income The components of net investment income for the three months ended March 31, 2016 and 2015 are as follows: Three Months Ended March 31, 2016 2015 Fixed income investments $ 38,400 $ 30,252 Equity investments 3,847 1,681 Other investments (28,257 ) 12,388 Cash and cash equivalents 1,047 914 15,037 45,235 Investment expenses (3,856 ) (3,374 ) Net investment income $ 11,181 $ 41,861 3. Investments, cont'd. Contractual maturities of the Company's fixed maturity and short-term investments are shown below as of March 31, 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. March 31, 2016 December 31, 2015 Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 452,121 $ 452,564 $ 622,070 $ 622,248 Due after one year through five years 2,011,248 2,029,127 2,005,456 1,995,502 Due after five years through ten years 655,988 667,325 683,147 676,932 Due after ten years 45,935 48,226 33,168 34,651 Residential mortgage-backed securities 1,396,244 1,423,529 1,301,083 1,311,373 Commercial mortgage-backed securities 806,500 810,196 817,570 812,886 Collateralized loan and debt obligations 438,460 415,191 419,795 405,128 Asset-backed securities 466,290 464,894 510,540 507,255 Total $ 6,272,786 $ 6,311,052 $ 6,392,829 $ 6,365,975 The following table summarizes the fair value of the fixed maturity investments, short-term investments and equity securities classified as trading at March 31, 2016 and December 31, 2015 : March 31, 2016 December 31, 2015 Fixed maturity investments U.S. government and agencies securities $ 391,639 $ 319,674 U.S. state and municipal securities 5,248 5,559 Foreign government securities 101,289 49,861 Government guaranteed corporate securities 35,080 38,201 Corporate securities 668,646 532,192 Residential mortgage-backed securities 295,325 258,574 Commercial mortgage-backed securities 153,120 127,124 Collateralized loan and debt obligations (1) 109,995 103,219 Asset-backed securities 141,929 152,756 Total fixed maturity investments 1,902,271 1,587,160 Short-term investments 121,740 394,111 Total fixed income investments $ 2,024,011 $ 1,981,271 Equity securities Equity investments $ 15,330 $ 48 Preferred equity investments 444 553 Short-term fixed income fund 16,736 14,628 Total equity securities $ 32,510 $ 15,229 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $26.1 million and $38.5 million at March 31, 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 March 31, 2016 and December 31, 2015 , the Company had invested, net of capital returned, a total of $705.6 million and $737.1 million , respectively, in other investments. At March 31, 2016 and December 31, 2015 , the carrying value of other investments was $799.1 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 March 31, 2016 and December 31, 2015 : March 31, 2016 Market Value Unfunded Commitments Ineligible for Redemption over next 12 months Alternative funds Hedge funds $ 615,778 $ — $ 44,500 Private investment funds 82,486 100,068 82,486 Other investment funds 29,868 — 29,852 Total alternative funds 728,132 100,068 156,838 Specialty funds High yield loan funds 70,991 — — Total specialty funds 70,991 — — Total other investments $ 799,123 $ 100,068 $ 156,838 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, 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 months ended March 31, 2016 and 2015 is as follows: Three Months Ended March 31, 2016 2015 Gross realized gains on investment sales $ 9,856 $ 22,666 Gross realized losses on investment sales (11,195 ) (4,896 ) Net unrealized gains on trading securities 14,796 — Change in fair value of investment-related derivative financial instruments (1) 330 419 Net realized and unrealized gains $ 13,787 $ 18,189 (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 March 31, 2016 and December 31, 2015 are as follows: March 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity investments U.S. government and agencies securities $ 513,567 $ 10,449 $ (435 ) $ 523,581 U.S. state and municipal securities 13,404 346 (81 ) 13,669 Foreign government securities 101,525 1,855 (84 ) 103,296 Government guaranteed corporate securities 12,169 363 — 12,532 Corporate securities 1,180,283 17,965 (3,207 ) 1,195,041 Residential mortgage-backed securities 1,104,059 25,597 (1,452 ) 1,128,204 Commercial mortgage-backed securities 654,660 8,580 (6,164 ) 657,076 Collateralized loan and debt obligations (1) 311,021 1,007 (6,832 ) 305,196 Asset-backed securities 323,951 881 (1,867 ) 322,965 Total fixed maturity investments 4,214,639 67,043 (20,122 ) 4,261,560 Short-term investments 25,473 8 — 25,481 Total fixed income investments $ 4,240,112 $ 67,051 $ (20,122 ) $ 4,287,041 Equity securities Equity investments $ 434,465 $ 11,450 $ (38,507 ) $ 407,408 Emerging market debt funds 83,668 1,657 (1,171 ) 84,154 Convertible funds 46,331 — (844 ) 45,487 Preferred equity investments 13,759 1,655 (625 ) 14,789 Short-term fixed income fund 128 2 — 130 Total equity securities $ 578,351 $ 14,764 $ (41,147 ) $ 551,968 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $5.0 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 March 31, 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 March 31, 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 $ (166 ) $ 35,632 $ (269 ) $ 17,258 $ (435 ) $ 52,890 U.S. state and municipal securities (13 ) 242 (68 ) 2,277 (81 ) 2,519 Foreign government securities (10 ) 12,728 (74 ) 3,358 (84 ) 16,086 Corporate securities (2,035 ) 184,336 (1,172 ) 59,046 (3,207 ) 243,382 Residential mortgage-backed securities (474 ) 43,293 (978 ) 93,863 (1,452 ) 137,156 Commercial mortgage-backed securities (4,943 ) 298,209 (1,221 ) 46,109 (6,164 ) 344,318 Collateralized loan and debt obligations (6,053 ) 225,181 (779 ) 50,520 (6,832 ) 275,701 Asset-backed securities (1,534 ) 183,532 (333 ) 26,414 (1,867 ) 209,946 Total fixed income investments $ (15,228 ) $ 983,153 $ (4,894 ) $ 298,845 $ (20,122 ) $ 1,281,998 Equity securities Equity investments $ (38,505 ) $ 190,787 $ (2 ) $ 3 $ (38,507 ) $ 190,790 Emerging market debt funds — — (1,171 ) 60,704 (1,171 ) 60,704 Convertible funds (844 ) 45,487 — — (844 ) 45,487 Preferred equity investments (625 ) 8,013 — — (625 ) 8,013 Total equity securities $ (39,974 ) $ 244,287 $ (1,173 ) $ 60,707 $ (41,147 ) $ 304,994 (1) Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive loss at March 31, 2016 . As of March 31, 2016 , 815 available for sale securities were in an unrealized loss position aggregating $61.3 million . Of those, 199 securities with aggregated unrealized losses of $6.1 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 at March 31, 2016 compared to December 31, 2015 was primarily due to a decrease in interest rates during the three months ended March 31, 2016 . At March 31, 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. The Company has the ability and intent to hold its equity securities until recovery; therefore, the Company does not consider its available for sale fixed income investments or equity securities to be other-than-temporarily impaired at March 31, 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 March 31, 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 March 31, 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 March 31, 2016 , Endurance Bermuda owned 25.1% 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 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 months ended March 31, 2016 : Three Months Ended March 31, 2016 Non-controlling interests at December 31, 2015 $ 267,810 Income attributable to third-party investments in the BCGR Cell 5,741 Income attributable to third-party investments in BCRH 3,322 Net income attributable to non-controlling interests 9,063 Net preferred share redemptions attributable to third-party investments in the BCGR Cell (1) (9,623 ) Net investments attributable to third-parties in BCRH 16 Net change in third-party investments in non-controlling interests (9,607 ) Dividends declared by BCRH attributable to non-controlling interests (9,007 ) Non-controlling interests at March 31, 2016 $ 258,259 (1) The redemption from the BCGR Cell during the quarter ended March 31, 2016 was required to fund a dividend paid by BCGR in March 2016 and to enable BCGR to repay debt.

Fair Value Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 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. • 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 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 (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 March 31, 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 March 31, 2016 : Fair Value Measurements at March 31, 2016 Total at 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 $ 915,220 $ 26,321 $ 888,899 $ — U.S. state and municipal securities 18,917 — 18,917 — Foreign government securities 204,585 — 204,585 — Government guaranteed corporate securities 47,612 — 47,612 — Corporate securities 1,863,687 — 1,756,968 106,719 Residential mortgage-backed securities 1,423,529 — 1,423,529 — Commercial mortgage-backed securities 810,196 — 808,903 1,293 Collateralized loan and debt obligations 415,191 — 414,402 789 Asset-backed securities 464,894 — 464,894 — Total fixed maturity investments 6,163,831 26,321 6,028,709 108,801 Equity securities Equity investments 422,738 225,830 196,908 — Emerging market debt funds 84,154 — 84,154 — Convertible funds 45,487 — 45,487 — Preferred equity investments 15,233 — 15,233 — Short-term fixed income fund 16,866 16,866 — — Total equity securities 584,478 242,696 341,782 — Short-term investments 147,221 — 147,221 — Other assets (see Note 7) 93,045 681 62,393 29,971 Total assets $ 6,988,575 $ 269,698 $ 6,580,105 $ 138,772 Liabilities Other liabilities (see Note 7) $ 71,152 $ 1,135 $ 39,598 $ 30,419 Debt 727,535 — 727,535 — Total liabilities $ 798,687 $ 1,135 $ 767,133 $ 30,419 During the three months ended March 31, 2016 , $3.6 million of primarily of corporate securities were transferred into Level 3 as no observable inputs were available. $5.0 million of primarily corporate securities were transferred out of Level 3 to Level 2 during the period. During the three months ended March 31, 2015 , $1.7 million of collateralized debt and loan obligations were transferred into Level 3 as no observable inputs were available, and $4.3 million of primarily 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. 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 December 31, 2015 : Fair Value Measurements at December 31, 2015 Total at 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 March 31, 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 three months ended March 31, 2016 . 4. Fair value measurement, cont'd. Other assets and other liabilities measured at fair value at March 31, 2016 include assets of $30.0 million (December 31, 2015 - $41.5 million ) and liabilities of $30.4 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 liabilities classified in Level 3 that are measured at fair value on a recurring basis at March 31, 2016 and December 31, 2015 : March 31, 2016 Fair Value (Level 3) Valuation Techniques Unobservable Inputs Low High Weighted Average or Actual (U.S. dollars in thousands, except for correlation) Net weather and energy related derivative liabilities $ 448 Historical Analysis and Simulation Correlation 0 1 Actual Weather curve $ (9,400 ) $ (6,900 ) Actual Commodity curve $ — $ 14 Actual December 31, 2015 Fair Value (Level 3) Valuation Techniques Unobservable Inputs Low High Weighted Average or Actual (U.S. dollars in thousands, except for correlation) Net weather and energy related derivative liabilities $ 526 Historical Analysis and Simulation Correlation 0 1 Actual Weather curve $ (4,000 ) $ 10,600 Actual Commodity curve $ — $ 13 Actual 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 March 31, 2016 and 2015 : Three Months Ended March 31, 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 1,183 — 1,183 — Total realized and unrealized losses included in earnings (2,047 ) — (2,047 ) — Total income included in other underwriting (loss) income — 3,774 3,774 5,627 Total loss included in other underwriting (loss) income — (3,918 ) (3,918 ) (6,160 ) Change in unrealized gains included in other comprehensive income 230 — 230 — Change in unrealized losses included in other comprehensive income 185 — 185 — Purchases 671 — 671 — Issues — 2,692 2,692 (4,093 ) Sales (2,469 ) — (2,469 ) — Settlements — (14,080 ) (14,080 ) 16,236 Transfers into Level 3 3,629 — 3,629 — Transfers out of Level 3 (5,034 ) — (5,034 ) — Level 3, end of period $ 108,801 $ 29,971 $ 138,772 $ (30,419 ) Three Months Ended March 31, 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 (9 ) — (9 ) — Total income included in other underwriting (loss) income — 2,096 2,096 13,059 Total loss included in other underwriting (loss) income — (8,842 ) (8,842 ) (3,529 ) Change in unrealized gains included in other comprehensive income 6 — 6 — Change in unrealized losses included in other comprehensive income (129 ) — (129 ) — Issues — 3,212 3,212 (6,424 ) Sales (214 ) — (214 ) — Settlements — (6,858 ) (6,858 ) 14,875 Transfers into Level 3 1,733 — 1,733 — Transfers out of Level 3 (4,290 ) — (4,290 ) — Level 3, end of period $ 9,500 $ 15,223 $ 24,723 $ (17,385 )

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 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 months ended March 31, 2016 and 2015 : Three Months Ended 2016 2015 Numerator: Net income available to common and participating common shareholders $ 106,378 $ 100,291 Less amount allocated to participating common shareholders (1) (2,392 ) (2,959 ) Net income allocated to common shareholders $ 103,986 $ 97,332 Denominator: Weighted average shares - basic 65,607,387 43,542,491 Share equivalents: Options 59,684 146,792 Restricted shares 29,452 7,028 Weighted average shares - diluted 65,696,523 43,696,311 Basic earnings per common share $ 1.58 $ 2.24 Diluted earnings per common share $ 1.58 $ 2.23 (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 $0.468750 per Series B preferred share and $489.4792 per Series C preferred share on February 15, 2016 ( 2015 - Series A: $0.484375 , Series B: $0.468750 , Series C - Nil ). The Series B and Series C preferred share dividends were paid on March 15, 2016 to shareholders of record on March 1, 2016 . Endurance Holdings declared a dividend of $0.048438 per Series A preferred share effective November 19, 2015 for the period from December 15, 2015 to December 24, 2015. This Series A preferred share dividend was paid on January 12, 2016 to shareholders on record as of December 24, 2015. Endurance Holdings also declared a dividend of $0.38 per common share on February 25, 2016 ( 2015 - $0.35 ). The dividend was paid on March 31, 2016 to shareholders of record on March 18, 2016 . Three Months Ended 2016 2015 Dividends declared per Series A preferred share $ — $ 0.484375 Dividends declared per Series B preferred share $ 0.468750 $ 0.468750 Dividends declared per Series C preferred share $ 489.4792 $ — Dividends declared per common share $ 0.38 $ 0.35

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	3 Months Ended
	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive (Loss) Income	6. Accumulated other comprehensive (loss) income The following tables present the changes in accumulated other comprehensive (loss) income balances by component for the three months ended March 31, 2016 and 2015 : For the Three Months Ended March 31, 2016 Losses on cash flow hedges Unrealized (losses) gains on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,678 ) $ (12,638 ) $ (32,318 ) $ (46,634 ) Other comprehensive income before reclassifications — 55,494 (12,318 ) 43,176 Amounts reclassified from accumulated other comprehensive (loss) income (1) 22 2,264 — 2,286 Net current period other comprehensive income 22 57,758 (12,318 ) 45,462 Ending balance $ (1,656 ) $ 45,120 $ (44,636 ) $ (1,172 ) (1) All amounts are net of tax. For the Three Months Ended March 31, 2015 Losses on cash flow hedges Unrealized (losses) gains on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,766 ) 86,100 $ (7,628 ) $ 76,706 Other comprehensive income before reclassifications — 40,734 (23,458 ) 17,276 Amounts reclassified from accumulated other comprehensive (loss) income (1) 22 (16,245 ) — (16,223 ) Net current period other comprehensive income 22 24,489 (23,458 ) 1,053 Ending balance $ (1,744 ) $ 110,589 $ (31,086 ) $ 77,759 (1) All amounts are net of tax. 6. Accumulated other comprehensive (loss) income, cont'd. The following tables present the significant items reclassified out of accumulated other comprehensive (loss) income during the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 Details about accumulated other comprehensive (loss) income components Amount reclassified from accumulated other comprehensive (loss) 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 $ 1,877 Net realized losses on available for sale securities 623 Net impairment losses recognized in earnings 2,500 Total before income taxes (236 ) Income tax benefit $ 2,264 Total net of income taxes Three Months Ended March 31, 2015 Details about accumulated other comprehensive (loss) income components Amount reclassified from accumulated other comprehensive (loss) 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 gains on available for sale securities $ (17,770 ) Net realized and unrealized gains 649 Net impairment losses recognized in earnings (17,121 ) Total before income taxes 876 Income tax expense $ (16,245 ) Total net of income taxes

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 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 (loss) income 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 March 31, 2016 and December 31, 2015 are shown below. March 31, 2016 December 31, 2015 Fair Value Notional Principal Amount Fair Value Notional Principal Amount Derivatives recorded in other assets Foreign exchange forward contracts $ 838 $ 38,387 $ 425 $ 38,818 Credit default swaps 212 4,577 36 4,225 Interest rate swaptions 14 125,500 — — Interest rate futures 6 54,769 — — TBAs 61,323 58,100 26,924 25,700 Energy and weather contracts 30,652 47,439 41,507 70,388 Total recorded in other assets $ 93,045 $ 68,892 Derivatives recorded in other liabilities Foreign exchange forward contracts $ 1,046 $ 29,034 $ 372 $ 30,400 Credit default swaps 178 5,228 276 7,800 Interest rate swaps 67 42,000 7 42,000 Interest rate swaptions — 8,400 — — Interest rate futures — — 8 54,488 ILWs 1,142 2,700 259 19,500 LIBOR swap 377 100,000 233 100,000 TBAs 33,017 31,400 — — Loss development cover 3,771 23,189 2,904 22,322 Energy and weather contracts 31,554 94,879 42,029 148,325 Total recorded in other liabilities $ 71,152 $ 46,088 Net derivative asset $ 21,893 $ 22,804 At March 31, 2016 , the Company's derivative assets of $93.0 million ( December 31, 2015 - $68.9 million ) and liabilities of $71.2 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 March 31, 2016 and December 31, 2015 , the Company's derivative instruments were recorded on a gross basis in the Condensed Consolidated Balance Sheets. At March 31, 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 months ended March 31, 2016 and 2015 were as follows: Three Months Ended 2016 2015 Total (losses) gains included in net foreign exchange (gains) losses from foreign exchange forward contracts $ (538 ) $ 1,469 Interest rate futures (282 ) 122 Credit default swaps 30 — Interest rate swaps (51 ) (555 ) Interest rate swaptions (13 ) 28 ILWs 304 — LIBOR swap (144 ) — TBAs 486 824 Total gains included in net realized and unrealized gains 330 419 Energy and weather contracts (715 ) 2,784 Loss development cover (867 ) — Total (losses) gains included in other underwriting (loss) income (1,582 ) 2,784 Total (losses) gains from derivatives $ (1,790 ) $ 4,672

Stock-Based Employee Compensati

Stock-Based Employee Compensation And Other Stock Plans	3 Months Ended
	Mar. 31, 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, vested, expired or exercised during the quarters ended March 31, 2016 and 2015 . For the quarter ended March 31, 2016 , compensation costs recognized in earnings for all options totaled $0.3 million ( 2015 - $0.6 million ). At March 31, 2016 , compensation costs not yet recognized related to unvested stock options was $0.7 million ( 2015 - $2.1 million ). During the quarter ended March 31, 2016 , the Company granted an aggregate of 560,172 ( 2015 – 472,662 ) restricted shares and restricted share units under the 2007 Plan. The restricted shares and restricted share units granted had weighted average grant date fair values of $33.3 million ( 2015 - $28.0 million ). During the quarter ended March 31, 2016 , the aggregate fair value of restricted shares that vested was $33.0 million ( 2015 - $13.8 million ). For the quarter ended March 31, 2016 , compensation costs recognized in earnings for all restricted shares and restricted share units were $9.7 million ( 2015 - $9.2 million ). At March 31, 2016 , compensation costs not yet recognized related to unvested restricted shares and restricted share units was $46.3 million ( 2015 - $38.7 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 months ended March 31, 2016 , total expenses related to the Company's ESPP were approximately $100,000 ( 2015 - $65,000 ).

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 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 March 31, 2016 and the reserve for losses and loss expenses as of March 31, 2016 : Three Months Ended March 31, 2016 Insurance Reinsurance Total Revenues Gross premiums written $ 835,117 $ 776,560 $ 1,611,677 Ceded premiums written (464,173 ) (208,662 ) (672,835 ) Net premiums written 370,944 567,898 938,842 Net premiums earned 219,569 333,622 553,191 Other underwriting loss — (2,444 ) (2,444 ) 219,569 331,178 550,747 Expenses Net losses and loss expenses 127,803 115,525 243,328 Acquisition expenses 30,358 73,484 103,842 General and administrative expenses 38,429 33,796 72,225 196,590 222,805 419,395 Underwriting income $ 22,979 $ 108,373 131,352 Net investment income 11,181 Corporate expenses (11,771 ) Net foreign exchange gains 11,729 Net realized and unrealized gains 13,787 Net impairment losses recognized in earnings (623 ) Amortization of intangibles (21,374 ) Interest expense (10,870 ) Income before income taxes $ 123,411 Net loss ratio 58.2 % 34.7 % 43.9 % Acquisition expense ratio 13.8 % 22.0 % 18.8 % General and administrative expense ratio 17.5 % 10.1 % 15.2 % (1) Combined ratio 89.5 % 66.8 % 77.9 % Reserve for losses and loss expenses $ 2,435,730 $ 2,022,459 $ 4,458,189 (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 March 31, 2015 and the reserve for losses and loss expenses as of March 31, 2015 : Three Months Ended March 31, 2015 Insurance Reinsurance Total Revenues Gross premiums written $ 736,218 $ 565,214 $ 1,301,432 Ceded premiums written (432,179 ) (104,299 ) (536,478 ) Net premiums written 304,039 460,915 764,954 Net premiums earned 135,864 253,995 389,859 Other underwriting income — 2,406 2,406 135,864 256,401 392,265 Expenses Net losses and loss expenses 74,512 97,424 171,936 Acquisition expenses 15,883 66,210 82,093 General and administrative expenses 28,842 26,048 54,890 119,237 189,682 308,919 Underwriting income $ 16,627 $ 66,719 83,346 Net investment income 41,861 Corporate expenses (12,268 ) Net foreign exchange losses (7,552 ) Net realized and unrealized gains 18,189 Net impairment losses recognized in earnings (649 ) Amortization of intangibles (1,599 ) Interest expense (9,059 ) Income before income taxes $ 112,269 Net loss ratio 54.8 % 38.3 % 44.1 % Acquisition expense ratio 11.7 % 26.1 % 21.1 % General and administrative expense ratio 21.3 % 10.3 % 17.2 % (1) Combined ratio 87.8 % 74.7 % 82.4 % Reserve for losses and loss expenses $ 1,952,277 $ 1,669,451 $ 3,621,728 (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 March 31, 2016 and 2015 : Gross premiums written Net premiums written Gross premiums written Net premiums written Business Segment 2016 2016 2015 2015 Insurance Agriculture $ 496,216 $ 208,627 $ 516,916 $ 202,460 Casualty and other specialty 138,255 63,497 100,682 45,058 Professional lines 77,415 43,334 54,760 24,231 Property, marine/energy and aviation 123,231 55,486 63,860 32,290 Total Insurance 835,117 370,944 736,218 304,039 Reinsurance Catastrophe 200,830 88,868 124,407 53,460 Property 156,466 150,056 125,700 123,449 Casualty 98,720 98,719 58,098 58,098 Professional lines 48,549 48,220 43,857 43,857 Specialty 271,995 182,035 213,152 182,051 Total Reinsurance 776,560 567,898 565,214 460,915 Total $ 1,611,677 $ 938,842 $ 1,301,432 $ 764,954

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 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 March 31, 2016 and December 31, 2015 amounted to $1,266.5 million and $1,196.0 million , respectively. At March 31, 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 March 31, 2016 and December 31, 2015 , the Company held collateral of $302.3 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 three months ended March 31, 2016 and 2015 , respectively: Broker 2016 2015 Marsh & McLennan Companies, Inc. 19.1 % 15.4 % Aon Benfield 13.4 % 13.5 % Willis Companies 8.9 % 8.3 % Total of largest brokers 41.4 % 37.2 % Letters of credit. As of March 31, 2016 , the Company had issued letters of credit of $340.9 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 March 31, 2016 and December 31, 2015 , the Company had pledged cash and cash equivalents and fixed maturity investments of $113.9 million and $108.9 million , respectively, in favor of certain ceding companies to collateralize obligations. As of March 31, 2016 and December 31, 2015 , the Company had also pledged $375.6 million and $383.3 million of its cash and fixed maturity investments as required to meet collateral obligations for $340.9 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 March 31, 2016 and December 31, 2015 , cash and fixed maturity investments with fair values of $211.0 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 March 31, 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 March 31, 2016 , the fair value of the assets held in the Blue Water Trusts was $404.2 million ( December 31, 2015 - $438.9 million ), which met the minimum value required on that date. As of March 31, 2016 , Blue Capital Re had pledged $182.7 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 March 31, 2016 , the fair value of the assets held in the Blue Capital Re ILS Trusts was $3.1 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 March 31, 2016 , the fair value of the investments held in the Endurance Reinsurance Trust exceeded $108.1 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 March 31, 2016 , the fair value of the assets held in the Reduced Collateral Trust exceeded $13.4 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 March 31, 2016 , the fair value of the assets held in the MUSIC Trust was $21.8 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 March 31, 2016 , the fair value of cash and investments held in the Lloyd's Capital Trust was $278.6 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 March 31, 2016 , the fair value of all assets held in the Premiums Trust Funds was $237.4 million ( December 31, 2015 - $231.9 million ). The Company also held cash balances in Syndicate 5151 of $25.3 million ( December 31, 2015 - $23.8 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 $1.4 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 $1.8 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 March 31, 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% . 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 permits BCGR to borrow up to $20.0 million on a revolving basis for working capital and general corporate purposes. The Company is 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 are scheduled to expire on May 12, 2016. As of March 31, 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% . On May 6, 2016, the Company, through a wholly-owned subsidiary, entered into a credit facility agreement with BCRH (the "Blue Capital Credit Facility"). The Blue Capital 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 Blue Capital 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 Blue Capital 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 Blue Capital 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 Blue Capital Credit Facility. 10. Commitments and contingencies, cont'd. 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 March 31, 2016 are as follows: Twelve months ended March 31, Amount 2017 $ 16,195 2018 16,430 2019 15,653 2020 15,661 2021 14,210 2022 and thereafter 23,708 $ 101,857 Total net lease expense under operating leases for the three months ended March 31, 2016 was $3.3 million ( 2015 – $3.1 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)	3 Months Ended
	Mar. 31, 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 March 31, 2016 , there were letters of credit outstanding under the Credit Facility of $329.9 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. 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. 11. Debt and financing arrangements, cont'd. 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.

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events [Text Block]	12. Subsequent event On May 2, 2016, Endurance issued a notice to redeem, on June 1, 2016, all 9,200,000 shares outstanding of its 7.5% Non-Cumulative Preferred Shares, Series B ("Series B Preferred Shares"). The Series B Preferred Shares will be redeemed at a redemption price of $25.00 per share together with an amount equal to any dividends that have been declared but not paid prior to June 1, 2016.

Summary Of Significant Accoun20

Summary Of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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.

Investments (Policy)

Investments (Policy)	3 Months Ended
	Mar. 31, 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 March 31, 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 March 31, 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 March 31, 2016 , Endurance Bermuda owned 25.1% 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 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)	3 Months Ended
	Mar. 31, 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. • 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 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 (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 March 31, 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)	3 Months Ended
	Mar. 31, 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)	3 Months Ended
	Mar. 31, 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 (loss) income 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 March 31, 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)	3 Months Ended
	Mar. 31, 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)	3 Months Ended
	Mar. 31, 2016
Investments [Abstract]
Composition Of Net Investment Income	The components of net investment income for the three months ended March 31, 2016 and 2015 are as follows: Three Months Ended March 31, 2016 2015 Fixed income investments $ 38,400 $ 30,252 Equity investments 3,847 1,681 Other investments (28,257 ) 12,388 Cash and cash equivalents 1,047 914 15,037 45,235 Investment expenses (3,856 ) (3,374 ) Net investment income $ 11,181 $ 41,861
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 March 31, 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. March 31, 2016 December 31, 2015 Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 452,121 $ 452,564 $ 622,070 $ 622,248 Due after one year through five years 2,011,248 2,029,127 2,005,456 1,995,502 Due after five years through ten years 655,988 667,325 683,147 676,932 Due after ten years 45,935 48,226 33,168 34,651 Residential mortgage-backed securities 1,396,244 1,423,529 1,301,083 1,311,373 Commercial mortgage-backed securities 806,500 810,196 817,570 812,886 Collateralized loan and debt obligations 438,460 415,191 419,795 405,128 Asset-backed securities 466,290 464,894 510,540 507,255 Total $ 6,272,786 $ 6,311,052 $ 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 March 31, 2016 and December 31, 2015 : March 31, 2016 December 31, 2015 Fixed maturity investments U.S. government and agencies securities $ 391,639 $ 319,674 U.S. state and municipal securities 5,248 5,559 Foreign government securities 101,289 49,861 Government guaranteed corporate securities 35,080 38,201 Corporate securities 668,646 532,192 Residential mortgage-backed securities 295,325 258,574 Commercial mortgage-backed securities 153,120 127,124 Collateralized loan and debt obligations (1) 109,995 103,219 Asset-backed securities 141,929 152,756 Total fixed maturity investments 1,902,271 1,587,160 Short-term investments 121,740 394,111 Total fixed income investments $ 2,024,011 $ 1,981,271 Equity securities Equity investments $ 15,330 $ 48 Preferred equity investments 444 553 Short-term fixed income fund 16,736 14,628 Total equity securities $ 32,510 $ 15,229 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $26.1 million and $38.5 million at March 31, 2016 and December 31, 2015 , respectively.
Other Investments	The following table summarizes the composition, unfunded commitments and redemption restrictions of other investments as of March 31, 2016 and December 31, 2015 : March 31, 2016 Market Value Unfunded Commitments Ineligible for Redemption over next 12 months Alternative funds Hedge funds $ 615,778 $ — $ 44,500 Private investment funds 82,486 100,068 82,486 Other investment funds 29,868 — 29,852 Total alternative funds 728,132 100,068 156,838 Specialty funds High yield loan funds 70,991 — — Total specialty funds 70,991 — — Total other investments $ 799,123 $ 100,068 $ 156,838 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 months ended March 31, 2016 and 2015 is as follows: Three Months Ended March 31, 2016 2015 Gross realized gains on investment sales $ 9,856 $ 22,666 Gross realized losses on investment sales (11,195 ) (4,896 ) Net unrealized gains on trading securities 14,796 — Change in fair value of investment-related derivative financial instruments (1) 330 419 Net realized and unrealized gains $ 13,787 $ 18,189 (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 March 31, 2016 and December 31, 2015 are as follows: March 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity investments U.S. government and agencies securities $ 513,567 $ 10,449 $ (435 ) $ 523,581 U.S. state and municipal securities 13,404 346 (81 ) 13,669 Foreign government securities 101,525 1,855 (84 ) 103,296 Government guaranteed corporate securities 12,169 363 — 12,532 Corporate securities 1,180,283 17,965 (3,207 ) 1,195,041 Residential mortgage-backed securities 1,104,059 25,597 (1,452 ) 1,128,204 Commercial mortgage-backed securities 654,660 8,580 (6,164 ) 657,076 Collateralized loan and debt obligations (1) 311,021 1,007 (6,832 ) 305,196 Asset-backed securities 323,951 881 (1,867 ) 322,965 Total fixed maturity investments 4,214,639 67,043 (20,122 ) 4,261,560 Short-term investments 25,473 8 — 25,481 Total fixed income investments $ 4,240,112 $ 67,051 $ (20,122 ) $ 4,287,041 Equity securities Equity investments $ 434,465 $ 11,450 $ (38,507 ) $ 407,408 Emerging market debt funds 83,668 1,657 (1,171 ) 84,154 Convertible funds 46,331 — (844 ) 45,487 Preferred equity investments 13,759 1,655 (625 ) 14,789 Short-term fixed income fund 128 2 — 130 Total equity securities $ 578,351 $ 14,764 $ (41,147 ) $ 551,968 (1) Balances include amounts related to collateralized debt obligations held with total fair values of $5.0 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 March 31, 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 March 31, 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 $ (166 ) $ 35,632 $ (269 ) $ 17,258 $ (435 ) $ 52,890 U.S. state and municipal securities (13 ) 242 (68 ) 2,277 (81 ) 2,519 Foreign government securities (10 ) 12,728 (74 ) 3,358 (84 ) 16,086 Corporate securities (2,035 ) 184,336 (1,172 ) 59,046 (3,207 ) 243,382 Residential mortgage-backed securities (474 ) 43,293 (978 ) 93,863 (1,452 ) 137,156 Commercial mortgage-backed securities (4,943 ) 298,209 (1,221 ) 46,109 (6,164 ) 344,318 Collateralized loan and debt obligations (6,053 ) 225,181 (779 ) 50,520 (6,832 ) 275,701 Asset-backed securities (1,534 ) 183,532 (333 ) 26,414 (1,867 ) 209,946 Total fixed income investments $ (15,228 ) $ 983,153 $ (4,894 ) $ 298,845 $ (20,122 ) $ 1,281,998 Equity securities Equity investments $ (38,505 ) $ 190,787 $ (2 ) $ 3 $ (38,507 ) $ 190,790 Emerging market debt funds — — (1,171 ) 60,704 (1,171 ) 60,704 Convertible funds (844 ) 45,487 — — (844 ) 45,487 Preferred equity investments (625 ) 8,013 — — (625 ) 8,013 Total equity securities $ (39,974 ) $ 244,287 $ (1,173 ) $ 60,707 $ (41,147 ) $ 304,994 (1) Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive loss at March 31, 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 months ended March 31, 2016 : Three Months Ended March 31, 2016 Non-controlling interests at December 31, 2015 $ 267,810 Income attributable to third-party investments in the BCGR Cell 5,741 Income attributable to third-party investments in BCRH 3,322 Net income attributable to non-controlling interests 9,063 Net preferred share redemptions attributable to third-party investments in the BCGR Cell (1) (9,623 ) Net investments attributable to third-parties in BCRH 16 Net change in third-party investments in non-controlling interests (9,607 ) Dividends declared by BCRH attributable to non-controlling interests (9,007 ) Non-controlling interests at March 31, 2016 $ 258,259 (1) The redemption from the BCGR Cell during the quarter ended March 31, 2016 was required to fund a dividend paid by BCGR in March 2016 and to enable BCGR to repay debt.

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2016 : Fair Value Measurements at March 31, 2016 Total at 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 $ 915,220 $ 26,321 $ 888,899 $ — U.S. state and municipal securities 18,917 — 18,917 — Foreign government securities 204,585 — 204,585 — Government guaranteed corporate securities 47,612 — 47,612 — Corporate securities 1,863,687 — 1,756,968 106,719 Residential mortgage-backed securities 1,423,529 — 1,423,529 — Commercial mortgage-backed securities 810,196 — 808,903 1,293 Collateralized loan and debt obligations 415,191 — 414,402 789 Asset-backed securities 464,894 — 464,894 — Total fixed maturity investments 6,163,831 26,321 6,028,709 108,801 Equity securities Equity investments 422,738 225,830 196,908 — Emerging market debt funds 84,154 — 84,154 — Convertible funds 45,487 — 45,487 — Preferred equity investments 15,233 — 15,233 — Short-term fixed income fund 16,866 16,866 — — Total equity securities 584,478 242,696 341,782 — Short-term investments 147,221 — 147,221 — Other assets (see Note 7) 93,045 681 62,393 29,971 Total assets $ 6,988,575 $ 269,698 $ 6,580,105 $ 138,772 Liabilities Other liabilities (see Note 7) $ 71,152 $ 1,135 $ 39,598 $ 30,419 Debt 727,535 — 727,535 — Total liabilities $ 798,687 $ 1,135 $ 767,133 $ 30,419 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 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
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 liabilities classified in Level 3 that are measured at fair value on a recurring basis at March 31, 2016 and December 31, 2015 : March 31, 2016 Fair Value (Level 3) Valuation Techniques Unobservable Inputs Low High Weighted Average or Actual (U.S. dollars in thousands, except for correlation) Net weather and energy related derivative liabilities $ 448 Historical Analysis and Simulation Correlation 0 1 Actual Weather curve $ (9,400 ) $ (6,900 ) Actual Commodity curve $ — $ 14 Actual December 31, 2015 Fair Value (Level 3) Valuation Techniques Unobservable Inputs Low High Weighted Average or Actual (U.S. dollars in thousands, except for correlation) Net weather and energy related derivative liabilities $ 526 Historical Analysis and Simulation Correlation 0 1 Actual Weather curve $ (4,000 ) $ 10,600 Actual Commodity curve $ — $ 13 Actual
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 March 31, 2016 and 2015 : Three Months Ended March 31, 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 1,183 — 1,183 — Total realized and unrealized losses included in earnings (2,047 ) — (2,047 ) — Total income included in other underwriting (loss) income — 3,774 3,774 5,627 Total loss included in other underwriting (loss) income — (3,918 ) (3,918 ) (6,160 ) Change in unrealized gains included in other comprehensive income 230 — 230 — Change in unrealized losses included in other comprehensive income 185 — 185 — Purchases 671 — 671 — Issues — 2,692 2,692 (4,093 ) Sales (2,469 ) — (2,469 ) — Settlements — (14,080 ) (14,080 ) 16,236 Transfers into Level 3 3,629 — 3,629 — Transfers out of Level 3 (5,034 ) — (5,034 ) — Level 3, end of period $ 108,801 $ 29,971 $ 138,772 $ (30,419 ) Three Months Ended March 31, 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 (9 ) — (9 ) — Total income included in other underwriting (loss) income — 2,096 2,096 13,059 Total loss included in other underwriting (loss) income — (8,842 ) (8,842 ) (3,529 ) Change in unrealized gains included in other comprehensive income 6 — 6 — Change in unrealized losses included in other comprehensive income (129 ) — (129 ) — Issues — 3,212 3,212 (6,424 ) Sales (214 ) — (214 ) — Settlements — (6,858 ) (6,858 ) 14,875 Transfers into Level 3 1,733 — 1,733 — Transfers out of Level 3 (4,290 ) — (4,290 ) — Level 3, end of period $ 9,500 $ 15,223 $ 24,723 $ (17,385 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 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 months ended March 31, 2016 and 2015 : Three Months Ended 2016 2015 Numerator: Net income available to common and participating common shareholders $ 106,378 $ 100,291 Less amount allocated to participating common shareholders (1) (2,392 ) (2,959 ) Net income allocated to common shareholders $ 103,986 $ 97,332 Denominator: Weighted average shares - basic 65,607,387 43,542,491 Share equivalents: Options 59,684 146,792 Restricted shares 29,452 7,028 Weighted average shares - diluted 65,696,523 43,696,311 Basic earnings per common share $ 1.58 $ 2.24 Diluted earnings per common share $ 1.58 $ 2.23 (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 2016 2015 Dividends declared per Series A preferred share $ — $ 0.484375 Dividends declared per Series B preferred share $ 0.468750 $ 0.468750 Dividends declared per Series C preferred share $ 489.4792 $ — Dividends declared per common share $ 0.38 $ 0.35

Accumulated Other Comprehensi29

Accumulated Other Comprehensive (Loss) Income (Tables)	3 Months Ended
	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive (Loss) Income	The following tables present the changes in accumulated other comprehensive (loss) income balances by component for the three months ended March 31, 2016 and 2015 : For the Three Months Ended March 31, 2016 Losses on cash flow hedges Unrealized (losses) gains on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,678 ) $ (12,638 ) $ (32,318 ) $ (46,634 ) Other comprehensive income before reclassifications — 55,494 (12,318 ) 43,176 Amounts reclassified from accumulated other comprehensive (loss) income (1) 22 2,264 — 2,286 Net current period other comprehensive income 22 57,758 (12,318 ) 45,462 Ending balance $ (1,656 ) $ 45,120 $ (44,636 ) $ (1,172 ) (1) All amounts are net of tax. For the Three Months Ended March 31, 2015 Losses on cash flow hedges Unrealized (losses) gains on available for sale securities Foreign currency translation adjustments Total Beginning balance $ (1,766 ) 86,100 $ (7,628 ) $ 76,706 Other comprehensive income before reclassifications — 40,734 (23,458 ) 17,276 Amounts reclassified from accumulated other comprehensive (loss) income (1) 22 (16,245 ) — (16,223 ) Net current period other comprehensive income 22 24,489 (23,458 ) 1,053 Ending balance $ (1,744 ) $ 110,589 $ (31,086 ) $ 77,759 (1) All amounts are net of tax.
Reclassification Out Of Accumulated Other Comprehensive (Loss) Income	The following tables present the significant items reclassified out of accumulated other comprehensive (loss) income during the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 Details about accumulated other comprehensive (loss) income components Amount reclassified from accumulated other comprehensive (loss) 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 $ 1,877 Net realized losses on available for sale securities 623 Net impairment losses recognized in earnings 2,500 Total before income taxes (236 ) Income tax benefit $ 2,264 Total net of income taxes Three Months Ended March 31, 2015 Details about accumulated other comprehensive (loss) income components Amount reclassified from accumulated other comprehensive (loss) 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 gains on available for sale securities $ (17,770 ) Net realized and unrealized gains 649 Net impairment losses recognized in earnings (17,121 ) Total before income taxes 876 Income tax expense $ (16,245 ) Total net of income taxes

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2016 and December 31, 2015 are shown below. March 31, 2016 December 31, 2015 Fair Value Notional Principal Amount Fair Value Notional Principal Amount Derivatives recorded in other assets Foreign exchange forward contracts $ 838 $ 38,387 $ 425 $ 38,818 Credit default swaps 212 4,577 36 4,225 Interest rate swaptions 14 125,500 — — Interest rate futures 6 54,769 — — TBAs 61,323 58,100 26,924 25,700 Energy and weather contracts 30,652 47,439 41,507 70,388 Total recorded in other assets $ 93,045 $ 68,892 Derivatives recorded in other liabilities Foreign exchange forward contracts $ 1,046 $ 29,034 $ 372 $ 30,400 Credit default swaps 178 5,228 276 7,800 Interest rate swaps 67 42,000 7 42,000 Interest rate swaptions — 8,400 — — Interest rate futures — — 8 54,488 ILWs 1,142 2,700 259 19,500 LIBOR swap 377 100,000 233 100,000 TBAs 33,017 31,400 — — Loss development cover 3,771 23,189 2,904 22,322 Energy and weather contracts 31,554 94,879 42,029 148,325 Total recorded in other liabilities $ 71,152 $ 46,088 Net derivative asset $ 21,893 $ 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 months ended March 31, 2016 and 2015 were as follows: Three Months Ended 2016 2015 Total (losses) gains included in net foreign exchange (gains) losses from foreign exchange forward contracts $ (538 ) $ 1,469 Interest rate futures (282 ) 122 Credit default swaps 30 — Interest rate swaps (51 ) (555 ) Interest rate swaptions (13 ) 28 ILWs 304 — LIBOR swap (144 ) — TBAs 486 824 Total gains included in net realized and unrealized gains 330 419 Energy and weather contracts (715 ) 2,784 Loss development cover (867 ) — Total (losses) gains included in other underwriting (loss) income (1,582 ) 2,784 Total (losses) gains from derivatives $ (1,790 ) $ 4,672

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2015 and the reserve for losses and loss expenses as of March 31, 2015 : Three Months Ended March 31, 2015 Insurance Reinsurance Total Revenues Gross premiums written $ 736,218 $ 565,214 $ 1,301,432 Ceded premiums written (432,179 ) (104,299 ) (536,478 ) Net premiums written 304,039 460,915 764,954 Net premiums earned 135,864 253,995 389,859 Other underwriting income — 2,406 2,406 135,864 256,401 392,265 Expenses Net losses and loss expenses 74,512 97,424 171,936 Acquisition expenses 15,883 66,210 82,093 General and administrative expenses 28,842 26,048 54,890 119,237 189,682 308,919 Underwriting income $ 16,627 $ 66,719 83,346 Net investment income 41,861 Corporate expenses (12,268 ) Net foreign exchange losses (7,552 ) Net realized and unrealized gains 18,189 Net impairment losses recognized in earnings (649 ) Amortization of intangibles (1,599 ) Interest expense (9,059 ) Income before income taxes $ 112,269 Net loss ratio 54.8 % 38.3 % 44.1 % Acquisition expense ratio 11.7 % 26.1 % 21.1 % General and administrative expense ratio 21.3 % 10.3 % 17.2 % (1) Combined ratio 87.8 % 74.7 % 82.4 % Reserve for losses and loss expenses $ 1,952,277 $ 1,669,451 $ 3,621,728 (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 March 31, 2016 and the reserve for losses and loss expenses as of March 31, 2016 : Three Months Ended March 31, 2016 Insurance Reinsurance Total Revenues Gross premiums written $ 835,117 $ 776,560 $ 1,611,677 Ceded premiums written (464,173 ) (208,662 ) (672,835 ) Net premiums written 370,944 567,898 938,842 Net premiums earned 219,569 333,622 553,191 Other underwriting loss — (2,444 ) (2,444 ) 219,569 331,178 550,747 Expenses Net losses and loss expenses 127,803 115,525 243,328 Acquisition expenses 30,358 73,484 103,842 General and administrative expenses 38,429 33,796 72,225 196,590 222,805 419,395 Underwriting income $ 22,979 $ 108,373 131,352 Net investment income 11,181 Corporate expenses (11,771 ) Net foreign exchange gains 11,729 Net realized and unrealized gains 13,787 Net impairment losses recognized in earnings (623 ) Amortization of intangibles (21,374 ) Interest expense (10,870 ) Income before income taxes $ 123,411 Net loss ratio 58.2 % 34.7 % 43.9 % Acquisition expense ratio 13.8 % 22.0 % 18.8 % General and administrative expense ratio 17.5 % 10.1 % 15.2 % (1) Combined ratio 89.5 % 66.8 % 77.9 % Reserve for losses and loss expenses $ 2,435,730 $ 2,022,459 $ 4,458,189 (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 March 31, 2016 and 2015 : Gross premiums written Net premiums written Gross premiums written Net premiums written Business Segment 2016 2016 2015 2015 Insurance Agriculture $ 496,216 $ 208,627 $ 516,916 $ 202,460 Casualty and other specialty 138,255 63,497 100,682 45,058 Professional lines 77,415 43,334 54,760 24,231 Property, marine/energy and aviation 123,231 55,486 63,860 32,290 Total Insurance 835,117 370,944 736,218 304,039 Reinsurance Catastrophe 200,830 88,868 124,407 53,460 Property 156,466 150,056 125,700 123,449 Casualty 98,720 98,719 58,098 58,098 Professional lines 48,549 48,220 43,857 43,857 Specialty 271,995 182,035 213,152 182,051 Total Reinsurance 776,560 567,898 565,214 460,915 Total $ 1,611,677 $ 938,842 $ 1,301,432 $ 764,954

Commitments And Contingencies (

Commitments And Contingencies (Tables)	3 Months Ended
	Mar. 31, 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 three months ended March 31, 2016 and 2015 , respectively: Broker 2016 2015 Marsh & McLennan Companies, Inc. 19.1 % 15.4 % Aon Benfield 13.4 % 13.5 % Willis Companies 8.9 % 8.3 % Total of largest brokers 41.4 % 37.2 %
Schedule Of Future Minimum Lease Commitments	Future minimum lease commitments at March 31, 2016 are as follows: Twelve months ended March 31, Amount 2017 $ 16,195 2018 16,430 2019 15,653 2020 15,661 2021 14,210 2022 and thereafter 23,708 $ 101,857

General (Details)

General (Details)	3 Months Ended
	Mar. 31, 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	25.10%

Investments (Narrative) (Detail

Investments (Narrative) (Details) $ in Millions	Mar. 31, 2016USD ($)		Dec. 31, 2015USD ($)
Investments [Abstract]
Number of available for sale securities in an unrealized loss position	815		1,310
Number of securities in a continuous unrealized loss position for twelve months or greater	199		158
Unrealized losses	$ 61.3	[1]	$ 72.6	[2]
Unrealized losses, 12 months or greater	$ 6.1	[1]	$ 12.7	[2]
[1]	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive loss at March 31, 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
	Mar. 31, 2016	Mar. 31, 2015
Net Investment Income [Line Items]
Investment income before investment expenses	$ 15,037	$ 45,235
Investment expenses	(3,856)	(3,374)
Net investment income	11,181	41,861
Fixed income investments
Net Investment Income [Line Items]
Investment income before investment expenses	38,400	30,252
Equity investments
Net Investment Income [Line Items]
Investment income before investment expenses	3,847	1,681
Other investments
Net Investment Income [Line Items]
Investment income before investment expenses	(28,257)	12,388
Cash and cash equivalents
Net Investment Income [Line Items]
Investment income before investment expenses	$ 1,047	$ 914

Investments (Contractual Maturi

Investments (Contractual Maturities Of Fixed Income Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale and Trading Securities [Line Items]
Due within one year, amortized cost	$ 452,121	$ 622,070
Due within one year, fair value	452,564	622,248
Due after one year through five years, amortized cost	2,011,248	2,005,456
Due after one year through five years, fair value	2,029,127	1,995,502
Due after five years through ten years, amortized cost	655,988	683,147
Due after five years through ten years, fair value	667,325	676,932
Due after ten years, amortized cost	45,935	33,168
Due after ten years, fair value	48,226	34,651
Residential mortgage-backed securities
Schedule of Available-for-sale and Trading Securities [Line Items]
No single maturity date, amortized cost	1,396,244	1,301,083
No single maturity date, fair value	1,423,529	1,311,373
Fixed income investments, fair value	1,423,529	1,311,373
Commercial mortgage-backed securities
Schedule of Available-for-sale and Trading Securities [Line Items]
No single maturity date, amortized cost	806,500	817,570
No single maturity date, fair value	810,196	812,886
Fixed income investments, fair value	810,196	812,886
Collateralized loan and debt obligations
Schedule of Available-for-sale and Trading Securities [Line Items]
No single maturity date, amortized cost	438,460	419,795
No single maturity date, fair value	415,191	405,128
Fixed income investments, fair value	415,191	405,128
Asset-backed securities
Schedule of Available-for-sale and Trading Securities [Line Items]
No single maturity date, amortized cost	466,290	510,540
No single maturity date, fair value	464,894	507,255
Fixed income investments, fair value	464,894	507,255
Fixed income investments
Schedule of Available-for-sale and Trading Securities [Line Items]
Fixed income investments, amortized cost	6,272,786	6,392,829
Fixed income investments, fair value	$ 6,311,052	$ 6,365,975

Investments (Fair Value of Trad

Investments (Fair Value of Trading Investments) (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		$ 1,902,271	$ 1,587,160
Equity securities, trading at fair value		32,510	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		391,639	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		5,248	5,559
Foreign government securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		101,289	49,861
Government guaranteed corporate securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		35,080	38,201
Corporate securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		668,646	532,192
Residential mortgage-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		295,325	258,574
Commercial mortgage-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		153,120	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]	109,995	103,219
Asset-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		141,929	152,756
Fixed maturity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		1,902,271	1,587,160
Short-term investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		121,740	394,111
Fixed income investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		2,024,011	1,981,271
Equity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity securities, trading at fair value		15,330	48
Preferred equity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity securities, trading at fair value		444	553
Equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity securities, trading at fair value		32,510	15,229
Collateralized debt obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fixed maturity investments, trading at fair value		26,100	38,500
Short-term fixed income fund
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity securities, trading at fair value		$ 16,736	$ 14,628
[1]	Balances include amounts related to collateralized debt obligations held with total fair values of $26.1 million and $38.5 million at March 31, 2016 and December 31, 2015, respectively.

Investments (Other Investments)

Investments (Other Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Other investments, market value	$ 799,123	$ 872,617
Commitments under investment fund classified within other investments	100,068	132,070
Prohibited amount under redemption requests over the next 12 months	156,838	163,524
Alternative funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	728,132	809,121
Commitments under investment fund classified within other investments	100,068	102,070
Prohibited amount under redemption requests over the next 12 months	156,838	163,524
Hedge funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	615,778	704,966
Commitments under investment fund classified within other investments	0	0
Prohibited amount under redemption requests over the next 12 months	44,500	57,876
Private investment funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	82,486	80,690
Commitments under investment fund classified within other investments	100,068	102,070
Prohibited amount under redemption requests over the next 12 months	82,486	80,690
Other investment funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	29,868	23,465
Commitments under investment fund classified within other investments	0	0
Prohibited amount under redemption requests over the next 12 months	29,852	24,958
Specialty funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	70,991	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	70,991	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	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Other investments, invested amount	$ 705,600	$ 737,100
Other investments, market value	799,123	872,617
Alternative funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	$ 728,132	809,121
Hedge funds
Schedule of Equity Method Investments [Line Items]
Estimated liquidation, percentage in next 12 months	92.80%
Other investments, market value	$ 615,778	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	$ 82,486	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	$ 70,991	63,496
High yield loan funds
Schedule of Equity Method Investments [Line Items]
Other investments, market value	$ 70,991	$ 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
		Mar. 31, 2016	Mar. 31, 2015
Investments [Abstract]
Gross realized gains on investment sales		$ 9,856	$ 22,666
Gross realized losses on investment sales		(11,195)	(4,896)
Net unrealized gains on trading securities		14,796	0
Change in fair value of derivative financial instruments	[1]	330	419
Net realized and unrealized gains		$ 13,787	$ 18,189
[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	Mar. 31, 2016		Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	$ 4,214,639		$ 4,361,997
Fixed income investments, fair value	4,261,560		4,359,019
Equity securities, cost	578,351		542,429
Equity securities, fair value	551,968		513,585
U.S. government and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	513,567		499,386
Fixed income investments, gross unrealized gains	10,449		2,561
Fixed income investments, gross unrealized losses	(435)		(3,153)
Fixed income investments, fair value	523,581		498,794
U.S. state and municipal securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	13,404		16,908
Fixed income investments, gross unrealized gains	346		120
Fixed income investments, gross unrealized losses	(81)		(181)
Fixed income investments, fair value	13,669		16,847
Foreign government securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	101,525		110,893
Fixed income investments, gross unrealized gains	1,855		803
Fixed income investments, gross unrealized losses	(84)		(581)
Fixed income investments, fair value	103,296		111,115
Government guaranteed corporate securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	12,169		19,248
Fixed income investments, gross unrealized gains	363		311
Fixed income investments, gross unrealized losses	0		(7)
Fixed income investments, fair value	12,532		19,552
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	1,180,283		1,323,276
Fixed income investments, gross unrealized gains	17,965		5,698
Fixed income investments, gross unrealized losses	(3,207)		(11,232)
Fixed income investments, fair value	1,195,041		1,317,742
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	1,104,059		1,041,540
Fixed income investments, gross unrealized gains	25,597		16,400
Fixed income investments, gross unrealized losses	(1,452)		(5,141)
Fixed income investments, fair value	1,128,204		1,052,799
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	654,660		689,078
Fixed income investments, gross unrealized gains	8,580		4,737
Fixed income investments, gross unrealized losses	(6,164)		(8,053)
Fixed income investments, fair value	657,076		685,762
Collateralized loan and debt obligations
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	311,021	[1]	304,915	[2]
Fixed income investments, gross unrealized gains	1,007	[1]	796	[2]
Fixed income investments, gross unrealized losses	(6,832)	[1]	(3,802)	[2]
Fixed income investments, fair value	305,196	[1]	301,909	[2]
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	323,951		356,753
Fixed income investments, gross unrealized gains	881		585
Fixed income investments, gross unrealized losses	(1,867)		(2,839)
Fixed income investments, fair value	322,965		354,499
Fixed maturity investments
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	4,214,639		4,361,997
Fixed income investments, gross unrealized gains	67,043		32,011
Fixed income investments, gross unrealized losses	(20,122)		(34,989)
Fixed income investments, fair value	4,261,560		4,359,019
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	25,473		25,657
Fixed income investments, gross unrealized gains	8		28
Fixed income investments, gross unrealized losses	0		0
Fixed income investments, fair value	25,481		25,685
Fixed income investments
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, amortized cost	4,240,112		4,387,654
Fixed income investments, gross unrealized gains	67,051		32,039
Fixed income investments, gross unrealized losses	(20,122)		(34,989)
Fixed income investments, fair value	4,287,041		4,384,704
Equity investments
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost	434,465		418,822
Equity securities, gross unrealized gains	11,450		6,834
Equity securities, gross unrealized losses	(38,507)		(31,875)
Equity securities, fair value	407,408		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	1,657		0
Equity securities, gross unrealized losses	(1,171)		(5,453)
Equity securities, fair value	84,154		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	(844)		(146)
Equity securities, fair value	45,487		46,185
Preferred equity investments
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost	13,759		15,275
Equity securities, gross unrealized gains	1,655		1,946
Equity securities, gross unrealized losses	(625)		(151)
Equity securities, fair value	14,789		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	578,351		542,429
Equity securities, gross unrealized gains	14,764		8,781
Equity securities, gross unrealized losses	(41,147)		(37,625)
Equity securities, fair value	551,968		513,585
Collateralized debt obligations
Schedule of Available-for-sale Securities [Line Items]
Fixed income investments, fair value	$ 5,000		$ 11,400
[1]	Balances include amounts related to collateralized debt obligations held with total fair values of $5.0 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		Mar. 31, 2016		Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, 12 months or greater		$ (6,100)	[1]	$ (12,700)	[2]
Unrealized losses		(61,300)	[1]	(72,600)	[2]
U.S. government and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(166)	[1]	(2,175)	[2]
Fair value, less than 12 months		35,632		347,024
Unrealized losses, 12 months or greater		(269)	[1]	(978)	[2]
Fair value, 12 months or greater		17,258		16,669
Unrealized losses		(435)	[1]	(3,153)	[2]
Fair value		52,890		363,693
U.S. state and municipal securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(13)	[1]	(96)	[2]
Fair value, less than 12 months		242		9,662
Unrealized losses, 12 months or greater		(68)	[1]	(85)	[2]
Fair value, 12 months or greater		2,277		695
Unrealized losses		(81)	[1]	(181)	[2]
Fair value		2,519		10,357
Foreign government securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(10)	[1]	(404)	[2]
Fair value, less than 12 months		12,728		31,881
Unrealized losses, 12 months or greater		(74)	[1]	(177)	[2]
Fair value, 12 months or greater		3,358		3,966
Unrealized losses		(84)	[1]	(581)	[2]
Fair value		16,086		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		(2,035)	[1]	(9,222)	[2]
Fair value, less than 12 months		184,336		830,349
Unrealized losses, 12 months or greater		(1,172)	[1]	(2,010)	[2]
Fair value, 12 months or greater		59,046		51,024
Unrealized losses		(3,207)	[1]	(11,232)	[2]
Fair value		243,382		881,373
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(474)	[1]	(3,378)	[2]
Fair value, less than 12 months		43,293		365,082
Unrealized losses, 12 months or greater		(978)	[1]	(1,763)	[2]
Fair value, 12 months or greater		93,863		79,355
Unrealized losses		(1,452)	[1]	(5,141)	[2]
Fair value		137,156		444,437
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(4,943)	[1]	(6,708)	[2]
Fair value, less than 12 months		298,209		436,387
Unrealized losses, 12 months or greater		(1,221)	[1]	(1,345)	[2]
Fair value, 12 months or greater		46,109		42,246
Unrealized losses		(6,164)	[1]	(8,053)	[2]
Fair value		344,318		478,633
Collateralized loan and debt obligations
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(6,053)	[1]	(3,107)	[2]
Fair value, less than 12 months		225,181		224,520
Unrealized losses, 12 months or greater		(779)	[1]	(695)	[2]
Fair value, 12 months or greater		50,520		48,167
Unrealized losses		(6,832)	[1]	(3,802)	[2]
Fair value		275,701		272,687
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(1,534)	[1]	(2,624)	[2]
Fair value, less than 12 months		183,532		311,814
Unrealized losses, 12 months or greater		(333)	[1]	(215)	[2]
Fair value, 12 months or greater		26,414		12,880
Unrealized losses		(1,867)	[1]	(2,839)	[2]
Fair value		209,946		324,694
Fixed income investments
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(15,228)	[1]	(27,721)	[2]
Fair value, less than 12 months		983,153		2,558,411
Unrealized losses, 12 months or greater		(4,894)	[1]	(7,268)	[2]
Fair value, 12 months or greater		298,845		255,002
Unrealized losses		(20,122)	[1]	(34,989)	[2]
Fair value		1,281,998		2,813,413
Equity investments
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(38,505)	[1]	(31,875)	[2]
Fair value, less than 12 months		190,787		283,095
Unrealized losses, 12 months or greater		(2)	[1]	0	[2]
Fair value, 12 months or greater		3		0
Unrealized losses		(38,507)	[1]	(31,875)	[2]
Fair value		190,790		283,095
Emerging market debt funds
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		0	[1]	0	[2]
Fair value, less than 12 months		0		0
Unrealized losses, 12 months or greater		(1,171)	[1]	(5,453)	[2]
Fair value, 12 months or greater		60,704		56,421
Unrealized losses		(1,171)	[1]	(5,453)	[2]
Fair value		60,704		56,421
Convertible funds
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(844)	[1]	(146)	[2]
Fair value, less than 12 months		45,487		46,185
Unrealized losses, 12 months or greater		0	[1]	0	[2]
Fair value, 12 months or greater		0		0
Unrealized losses		(844)	[1]	(146)	[2]
Fair value		45,487		46,185
Preferred equity investments
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(625)	[1]	(151)	[2]
Fair value, less than 12 months		8,013		7,361
Unrealized losses, 12 months or greater		0	[1]	0	[2]
Fair value, 12 months or greater		0		0
Unrealized losses		(625)	[1]	(151)	[2]
Fair value		8,013		7,361
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months		(39,974)	[1]	(32,172)	[2]
Fair value, less than 12 months		244,287		336,641
Unrealized losses, 12 months or greater		(1,173)	[1]	(5,453)	[2]
Fair value, 12 months or greater		60,707		56,421
Unrealized losses		(41,147)	[1]	(37,625)	[2]
Fair value		$ 304,994		$ 393,062
[1]	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive loss at March 31, 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
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Non-controlling interests at December 31, 2015	$ 267,810	$ 0	$ 258,259
Net income attributable to non-controlling interests	9,063	$ 0
Net change in third-party investments in non-controlling interests	(9,607)
Non-controlling interests at March 31, 2016	$ 267,810
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	$ 3,322
Net investments attributable to third-parties in BCRH	16
Dividends declared by BCRH attributable to non-controlling interests	$ (9,007)
Blue Capital Global Reinsurance Fund [Member]
Noncontrolling Interest [Line Items]
Ownership percentage	25.10%
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income attributable to non-controlling interests	$ 5,741
Net change in third-party investments in non-controlling interests	$ (9,623)
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
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net impairment losses recognized in earnings	$ 623	$ 649
Transfers into Level 3	3,629	1,733
Transfers out of Level 3	$ (5,034)	(4,290)
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%		2.20%
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	$ 3,600
Transfers out of Level 3	$ (5,000)
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		(4,300)
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		$ 1,700

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	Mar. 31, 2016	Dec. 31, 2015
Assets
Short-term investments	$ 147,221	$ 419,796
Other assets (see Note 7)	93,045	68,892
Total assets	6,988,575	6,963,681
Liabilities
Other liabilities (see Note 7)	71,152	46,088
Debt	727,535	737,974
Total liabilities	798,687	784,062
Fair Value, Inputs, Level 1 [Member]
Assets
Short-term investments	0	0
Other assets (see Note 7)	681	4
Total assets	269,698	312,831
Liabilities
Other liabilities (see Note 7)	1,135	0
Debt	0	0
Total liabilities	1,135	0
Fair Value, Inputs, Level 2 [Member]
Assets
Short-term investments	147,221	419,796
Other assets (see Note 7)	62,393	27,385
Total assets	6,580,105	6,496,894
Liabilities
Other liabilities (see Note 7)	39,598	4,059
Debt	727,535	737,974
Total liabilities	767,133	742,033
Fair Value, Inputs, Level 3 [Member]
Assets
Short-term investments	0	0
Other assets (see Note 7)	29,971	41,503
Total assets	138,772	153,956
Liabilities
Other liabilities (see Note 7)	30,419	42,029
Debt	0	0
Total liabilities	30,419	42,029
U.S. government and agencies securities
Assets
Fixed maturity investments	915,220	818,468
U.S. government and agencies securities | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	26,321	37,741
U.S. government and agencies securities | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	888,899	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	18,917	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	18,917	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	204,585	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	204,585	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	47,612	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	47,612	57,753
Government guaranteed corporate securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	0	0
Corporate securities
Assets
Fixed maturity investments	1,863,687	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	1,756,968	1,739,002
Corporate securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	106,719	110,932
Residential mortgage-backed securities
Assets
Fixed maturity investments	1,423,529	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	1,423,529	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	810,196	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	808,903	812,174
Commercial mortgage-backed securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	1,293	712
Collateralized loan and debt obligations
Assets
Fixed maturity investments	415,191	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	414,402	404,319
Collateralized loan and debt obligations | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	789	809
Asset-backed securities
Assets
Fixed maturity investments	464,894	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	464,894	507,255
Asset-backed securities | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	0	0
Fixed maturity investments
Assets
Fixed maturity investments	6,163,831	5,946,179
Fixed maturity investments | Fair Value, Inputs, Level 1 [Member]
Assets
Fixed maturity investments	26,321	37,741
Fixed maturity investments | Fair Value, Inputs, Level 2 [Member]
Assets
Fixed maturity investments	6,028,709	5,795,985
Fixed maturity investments | Fair Value, Inputs, Level 3 [Member]
Assets
Fixed maturity investments	108,801	112,453
Equity investments
Assets
Equity securities	422,738	393,829
Equity investments | Fair Value, Inputs, Level 1 [Member]
Assets
Equity securities	225,830	260,330
Equity investments | Fair Value, Inputs, Level 2 [Member]
Assets
Equity securities	196,908	133,499
Equity investments | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	0	0
Emerging market debt funds
Assets
Equity securities	84,154	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	84,154	56,421
Emerging market debt funds | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	0	0
Convertible funds
Assets
Equity securities	45,487	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	45,487	46,185
Convertible funds | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	0	0
Preferred equity investments
Assets
Equity securities	15,233	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	15,233	17,623
Preferred equity investments | Fair Value, Inputs, Level 3 [Member]
Assets
Equity securities	0	0
Short-term fixed income fund
Assets
Equity securities	16,866	14,756
Short-term fixed income fund | Fair Value, Inputs, Level 1 [Member]
Assets
Equity securities	16,866	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	584,478	528,814
Equity securities | Fair Value, Inputs, Level 1 [Member]
Assets
Equity securities	242,696	275,086
Equity securities | Fair Value, Inputs, Level 2 [Member]
Assets
Equity securities	341,782	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)	3 Months Ended	12 Months Ended
	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Derivatives recorded in other assets, fair value	$ 93,045,000	$ 68,892,000
Derivatives recorded in other liabilities, fair value	71,152,000	46,088,000
Net weather and energy related derivative liabilities	21,893,000	22,804,000
Energy Related Derivative [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Derivatives recorded in other assets, fair value	30,652,000	41,507,000
Derivatives recorded in other liabilities, fair value	31,554,000	42,029,000
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Derivatives recorded in other assets, fair value	29,971,000	41,503,000
Derivatives recorded in other liabilities, fair value	30,419,000	42,029,000
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	29,971,000	41,503,000
Derivatives recorded in other liabilities, fair value	30,419,000	42,029,000
Net weather and energy related derivative liabilities	$ (448,000)	$ (526,000)
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
Weather curve	$ (6,900,000)	$ 10,600,000
Commodity curve	$ 14,000	$ 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
Weather curve	$ (9,400,000)	$ (4,000,000)
Commodity curve	$ 0	$ 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
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Level 3, beginning of period	$ 153,956	$ 37,905
Total realized and unrealized gains included in earnings	1,183	113
Total realized and unrealized losses included in earnings	(2,047)	(9)
Total income included in other underwriting (loss) income	3,774	2,096
Total loss included in other underwriting (loss) income	(3,918)	(8,842)
Change in unrealized gains included in other comprehensive income	230	6
Change in unrealized losses included in other comprehensive income	185	(129)
Purchases	671
Issues	2,692	3,212
Sales	(2,469)	(214)
Settlements	(14,080)	(6,858)
Transfers into Level 3	3,629	1,733
Transfers out of Level 3	(5,034)	(4,290)
Level 3, end of period	138,772	24,723
Fixed Maturity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Level 3, beginning of period	112,453	12,290
Total realized and unrealized gains included in earnings	1,183	113
Total realized and unrealized losses included in earnings	(2,047)	(9)
Total income included in other underwriting (loss) income	0	0
Total loss included in other underwriting (loss) income	0	0
Change in unrealized gains included in other comprehensive income	230	6
Change in unrealized losses included in other comprehensive income	185	(129)
Purchases	671
Issues	0	0
Sales	(2,469)	(214)
Settlements	0	0
Transfers into Level 3	3,629	1,733
Transfers out of Level 3	(5,034)	(4,290)
Level 3, end of period	108,801	9,500
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Level 3, beginning of period	41,503	25,615
Total realized and unrealized gains included in earnings	0	0
Total realized and unrealized losses included in earnings	0	0
Total income included in other underwriting (loss) income	3,774	2,096
Total loss included in other underwriting (loss) income	(3,918)	(8,842)
Change in unrealized gains included in other comprehensive income		0
Change in unrealized losses included in other comprehensive income		0
Purchases	0
Issues	2,692	3,212
Sales	0	0
Settlements	(14,080)	(6,858)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Level 3, end of period	29,971	15,223
Other Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Level 3, beginning of period	(42,029)	(35,366)
Total realized and unrealized gains included in earnings	0	0
Total realized and unrealized losses included in earnings	0	0
Total income included in other underwriting (loss) income	(5,627)	(13,059)
Total loss included in other underwriting (loss) income	(6,160)	(3,529)
Change in unrealized gains included in other comprehensive income	0	0
Change in unrealized losses included in other comprehensive income	0	0
Purchases	0
Issues	(4,093)	(6,424)
Sales	0	0
Settlements	16,236	14,875
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Level 3, end of period	$ (30,419)	$ (17,385)

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
		Mar. 31, 2016	Mar. 31, 2015
Net income available to common and participating common shareholders		$ 106,378	$ 100,291
Less amount allocated to participating common shareholders	[1]	(2,392)	(2,959)
Net income allocated to common shareholders		$ 103,986	$ 97,332
Weighted average shares - basic		65,607,387	43,542,491
Weighted average shares - diluted		65,696,523	43,696,311
Basic earnings per common share		$ 1.58	$ 2.24
Diluted earnings per common share		$ 1.58	$ 2.23
Employee Stock Option [Member]
Share equivalents		59,684	146,792
Restricted Stock [Member]
Share equivalents		29,452	7,028
[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
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Dividends Declared [Line Items]
Dividends declared per common share	$ 0.38		$ 0.35
Series A Preferred Stock [Member]
Dividends Declared [Line Items]
Dividends declared per preferred share	0	$ 0.048438	0.484375
Series B Preferred Stock [Member]
Dividends Declared [Line Items]
Dividends declared per preferred share	0.468750		0.468750
Series C Preferred Stock [Member]
Dividends Declared [Line Items]
Dividends declared per preferred share	$ 489.4792		$ 0

Accumulated Other Comprehensi50

Accumulated Other Comprehensive (Loss) Income (Schedule Of Changes In Accumulated Other Comprehensive (Loss) Income By Component) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance		$ (46,634)	$ 76,706
Other comprehensive income before reclassifications		43,176	17,276
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	2,286	(16,223)
Other comprehensive income		45,462	1,053
Ending balance		(1,172)	77,759
Gains and losses on cash flow hedges [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance		(1,678)	(1,766)
Other comprehensive income before reclassifications		0	0
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	22	22
Other comprehensive income		22	22
Ending balance		(1,656)	(1,744)
Unrealized gains on available for sale securities [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance		(12,638)	86,100
Other comprehensive income before reclassifications		55,494	40,734
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	2,264	(16,245)
Other comprehensive income		57,758	24,489
Ending balance		45,120	110,589
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance		(32,318)	(7,628)
Other comprehensive income before reclassifications		(12,318)	(23,458)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	0	0
Other comprehensive income		(12,318)	(23,458)
Ending balance		$ (44,636)	$ (31,086)
[1]	All amounts are net of tax.

Accumulated Other Comprehensi51

Accumulated Other Comprehensive (Loss) Income (Schedule Of Reclassifications Out Of Accumulated Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive (Loss) Income [Line Items]
Interest expense	$ 10,870	$ 9,059
Net realized and unrealized (gains) losses	(13,787)	(18,189)
Net impairment losses recognized in earnings	623	649
Total before income taxes	(123,411)	(112,269)
Income tax (benefit) expense	(1,233)	3,790
Total net of income taxes	(115,581)	(108,479)
Gains and losses on cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive (Loss) Income [Line Items]
Interest expense	22	22
Total before income taxes	22	22
Income tax (benefit) expense	0	0
Total net of income taxes	22	22
Unrealized gains on available for sale securities [Member] | Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive (Loss) Income [Line Items]
Net realized and unrealized (gains) losses	1,877	(17,770)
Net impairment losses recognized in earnings	623	649
Total before income taxes	2,500	(17,121)
Income tax (benefit) expense	(236)	876
Total net of income taxes	$ 2,264	$ (16,245)

Derivatives (Schedule Of Deriva

Derivatives (Schedule Of Derivative Fair Value And Notional Amount) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	$ 93,045	$ 68,892
Derivatives recorded in other liabilities, fair value	71,152	46,088
Net derivative asset, fair value	21,893	22,804
Securities for Reverse Repurchase Agreements	0	30,000
Derivative assets traded under master netting agreements	93,000	68,900
Derivative liabilities traded under master netting agreements	$ 71,200	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	$ 838	425
Derivatives recorded in other liabilities, fair value	1,046	372
Derivatives recorded in other assets, notional principal amount	38,387	38,818
Derivatives recorded in other liabilities, notional principal amount	29,034	30,400
Credit Default Swap [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	212	36
Derivatives recorded in other liabilities, fair value	178	276
Derivatives recorded in other assets, notional principal amount	4,577	4,225
Derivatives recorded in other liabilities, notional principal amount	5,228	7,800
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other liabilities, fair value	67	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 assets, fair value	6	0
Derivatives recorded in other liabilities, fair value	0	8
Derivatives recorded in other assets, notional principal amount	54,769	0
Derivatives recorded in other liabilities, notional principal amount	0	54,488
Interest Rate Swaption [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other liabilities, fair value	0	0
Derivatives recorded in other liabilities, notional principal amount	8,400	0
Industry Loss Warranty [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other liabilities, fair value	1,142	259
Derivatives recorded in other liabilities, notional principal amount	2,700	19,500
LIBOR Swap [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other liabilities, fair value	377	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	$ 61,323	26,924
Derivatives recorded in other liabilities, fair value	33,017	0
Derivatives recorded in other assets, notional principal amount	58,100	25,700
Derivatives recorded in other liabilities, notional principal amount	31,400	0
Loss Development Cover [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other liabilities, fair value	3,771	2,904
Derivatives recorded in other liabilities, notional principal amount	23,189	22,322
Energy and weather contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives recorded in other assets, fair value	30,652	41,507
Derivatives recorded in other liabilities, fair value	31,554	42,029
Derivatives recorded in other assets, notional principal amount	47,439	70,388
Derivatives recorded in other liabilities, notional principal amount	$ 94,879	$ 148,325

Derivatives (Schedule Of Deri53

Derivatives (Schedule Of Derivative (Losses) Gains) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative [Line Items]
Total gains included in net realized and unrealized gains	$ 330	$ 419
Total (losses) gains included in other underwriting (loss) income	(1,582)	2,784
Total (losses) gains from derivatives	(1,790)	4,672
Foreign Exchange Forward [Member]
Derivative [Line Items]
Total (losses) gains included in net foreign exchange (gains) losses from foreign exchange forward contracts	(538)	1,469
Interest Rate Future [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	(282)	122
Credit Default Swap [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	30	0
Interest Rate Swap [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	(51)	(555)
Interest Rate Swaption [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	(13)	28
Industry Loss Warranty [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	304	0
LIBOR Swap [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	(144)	0
TBA [Member]
Derivative [Line Items]
Total gains included in net realized and unrealized gains	486	824
Energy and weather contracts [Member]
Derivative [Line Items]
Total (losses) gains included in other underwriting (loss) income	(715)	2,784
Loss Development Cover [Member]
Derivative [Line Items]
Total (losses) gains included in other underwriting (loss) income	$ (867)	$ 0

Stock-Based Employee Compensa54

Stock-Based Employee Compensation And Other Stock Plans (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares and RSUs, grants in period	560,172	472,662
Restricted shares and RSUs weighted average grant date fair value	$ 33,300,000	$ 28,000,000
Aggregate fair value of restricted shares and RSUs vested	33,000,000	13,800,000
Expenses related to employee stock purchase plan	$ 100,000	$ 65,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	0	0
Number of options expired	0	0
Number of options vested	0	0
Number of options exercised	0	0
Compensation costs recognized in earnings	$ 300,000	$ 600,000
Compensation costs not yet recognized - stock options	700,000	2,100,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs recognized in earnings	9,700,000	9,200,000
Compensation costs not yet recognized - restricted stock	$ 46,300,000	$ 38,700,000

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
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Gross premiums written		$ 1,611,677	$ 1,301,432
Ceded premiums written		(672,835)	(536,478)
Net premiums written		938,842	764,954
Net premiums earned		553,191	389,859
Other underwriting (loss) income		(2,444)	2,406
Total revenue		550,747	392,265
Net losses and loss expenses		243,328	171,936
Acquisition expenses		103,842	82,093
General and administrative expenses		72,225	54,890
Total expenses		419,395	308,919
Underwriting income		131,352	83,346
Net investment income		11,181	41,861
Corporate expenses		(11,771)	(12,268)
Net foreign exchange gains (losses)		11,729	(7,552)
Net realized and unrealized gains		13,787	18,189
Net impairment losses recognized in earnings		(623)	(649)
Amortization of intangibles		(21,374)	(1,599)
Interest expense		(10,870)	(9,059)
Income before income taxes		$ 123,411	$ 112,269
Net loss ratio		43.90%	44.10%
Acquisition expense ratio		18.80%	21.10%
General and administrative expense ratio	[1]	15.20%	17.20%
Combined ratio		77.90%	82.40%
Reserve for losses and loss expenses		$ 4,458,189	$ 3,621,728	$ 4,510,415
Insurance [Member]
Segment Reporting Information [Line Items]
Gross premiums written		835,117	736,218
Ceded premiums written		(464,173)	(432,179)
Net premiums written		370,944	304,039
Net premiums earned		219,569	135,864
Other underwriting (loss) income		0	0
Total revenue		219,569	135,864
Net losses and loss expenses		127,803	74,512
Acquisition expenses		30,358	15,883
General and administrative expenses		38,429	28,842
Total expenses		196,590	119,237
Underwriting income		$ 22,979	$ 16,627
Net loss ratio		58.20%	54.80%
Acquisition expense ratio		13.80%	11.70%
General and administrative expense ratio		17.50%	21.30%
Combined ratio		89.50%	87.80%
Reserve for losses and loss expenses		$ 2,435,730	$ 1,952,277
Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross premiums written		776,560	565,214
Ceded premiums written		(208,662)	(104,299)
Net premiums written		567,898	460,915
Net premiums earned		333,622	253,995
Other underwriting (loss) income		(2,444)	2,406
Total revenue		331,178	256,401
Net losses and loss expenses		115,525	97,424
Acquisition expenses		73,484	66,210
General and administrative expenses		33,796	26,048
Total expenses		222,805	189,682
Underwriting income		$ 108,373	$ 66,719
Net loss ratio		34.70%	38.30%
Acquisition expense ratio		22.00%	26.10%
General and administrative expense ratio		10.10%	10.30%
Combined ratio		66.80%	74.70%
Reserve for losses and loss expenses		$ 2,022,459	$ 1,669,451
[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
	Mar. 31, 2016	Mar. 31, 2015
Revenue from External Customer [Line Items]
Gross premiums written	$ 1,611,677	$ 1,301,432
Net premiums written	938,842	764,954
Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	835,117	736,218
Net premiums written	370,944	304,039
Agriculture Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	496,216	516,916
Net premiums written	208,627	202,460
Casualty And Other Specialty Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	138,255	100,682
Net premiums written	63,497	45,058
Professional Lines Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	77,415	54,760
Net premiums written	43,334	24,231
Property, Marine Energy and Aviation Insurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	123,231	63,860
Net premiums written	55,486	32,290
Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	776,560	565,214
Net premiums written	567,898	460,915
Catastrophe Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	200,830	124,407
Net premiums written	88,868	53,460
Property Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	156,466	125,700
Net premiums written	150,056	123,449
Casualty Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	98,720	58,098
Net premiums written	98,719	58,098
Professional Lines Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	48,549	43,857
Net premiums written	48,220	43,857
Specialty Reinsurance [Member]
Revenue from External Customer [Line Items]
Gross premiums written	271,995	213,152
Net premiums written	$ 182,035	$ 182,051

Commitments And Contingencies57

Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Reinsurance Recoverables	$ 1,266.5	$ 1,196
Collateral held related to ceded reinsurance agreements	302.3	321.5
Amount of letters of credit outstanding	340.9	341.6
Securities pledged as collateral obligation	113.9	108.9
Cash and investments pledged under letters of credit facility	$ 375.6	$ 383.3

Commitments And Contingencies58

Commitments And Contingencies (Schedule Of Percentage Of Gross Premiums Written) (Details)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue from External Customer [Line Items]
Percentage of gross premium written	41.40%	37.20%
Aon Benfield [Member]
Revenue from External Customer [Line Items]
Percentage of gross premium written	13.40%	13.50%
Willis Companies [Member]
Revenue from External Customer [Line Items]
Percentage of gross premium written	8.90%	8.30%
Marsh & Mclennan Companies, Inc. [Member]
Revenue from External Customer [Line Items]
Percentage of gross premium written	19.10%	15.40%

Commitments And Contingencies59

Commitments And Contingencies (Deposits) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
UNITED STATES [Member]
Statutory Accounting Practices [Line Items]
Assets Held by Insurance Regulators	$ 211	$ 208.3

Commitments And Contingencies60

Commitments And Contingencies (Assets Held In Trust) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Assets Held In Trust [Line Items]
Cash and cash equivalents	$ 1,212,733	$ 1,177,750	$ 657,194	$ 745,472
Blue Water Re Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	404,200	438,900
Blue Water Re [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	182,700	195,300
Blue Capital Re ILS Trusts [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	3,100	5,200
Endurance Reinsurance Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	108,100	94,100
Reduced Collateral Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	13,400	10,800
MUSIC Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	21,800	21,300
Lloyd's Capital Trust [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	278,600	276,800
Lloyd's Premiums Trust Funds [Member]
Assets Held In Trust [Line Items]
Assets Held-in-trust	237,400	231,900
Cash and cash equivalents	$ 25,300	$ 23,800

Commitments And Contingencies61

Commitments And Contingencies (Lloyd's New Central Fund) (Details) $ in Millions	3 Months Ended
	Mar. 31, 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	$ 1.4
Annual Subscription Charge As Percentage Of Premium Written	0.45%
Estimated Obligation For Annual Subscription Charges	$ 1.8

Commitments And Contingencies62

Commitments And Contingencies (Credit Agreements) (Details) - USD ($) $ in Millions	May. 06, 2016	Mar. 31, 2016	Mar. 23, 2016	Dec. 31, 2015	Apr. 19, 2012
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 450		$ 700
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Blue Capital Reinsurance Holdings [Member]
Line of Credit Facility [Line Items]
Term of facility		364 days
Maximum borrowing capacity		$ 20
Line Of Credit Facility Percentage Of Annual Guarantee Fee		0.125%
Outstanding borrowings		$ 0		$ 13
Blue Capital Reinsurance Holdings [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 20
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 Global Reinsurance Fund [Member]
Line of Credit Facility [Line Items]
Term of facility		364 days
Maximum borrowing capacity		$ 20
Line Of Credit Facility Percentage Of Annual Guarantee Fee		0.125%
Outstanding borrowings		$ 0		$ 6
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%

Commitments And Contingencies63

Commitments And Contingencies (Schedule Of Future Minimum Lease Commitments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
2,017	$ 16,195
2,018	16,430
2,019	15,653
2,020	15,661
2,021	14,210
2022 and thereafter	23,708
Total	101,857
Total lease expenses under operating leases	$ 3,300	$ 3,100

Debt And Financing Arrangemen64

Debt And Financing Arrangements (Details) - USD ($) $ in Millions	Mar. 23, 2016	Mar. 31, 2016	Dec. 31, 2015	Apr. 19, 2012
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 450			$ 700
Amount of letters of credit outstanding		$ 340.9	$ 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		$ 329.9	$ 329.9
Maximum [Member]
Line of Credit Facility [Line Items]
Leverage ratio		35.00%

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event [Member] - Series B Preferred Stock [Member]	Jun. 01, 2016$ / sharesshares
Subsequent Event [Line Items]
Stock called for redemption, shares | shares	9,200,000
Preferred stock, dividend percentage	7.50%
Preferred stock redemption price per share | $ / shares	$ 25