Endurance Specialty (ENH) Inactive 10-Q12 May 142014 Q1 Quarterly reportFinancial data

Company Profile

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
Document And Entity Information	Mar. 31, 2014	8-May-14
Document and Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Entity Registrant Name	'Endurance Specialty Holdings Ltd.	'
Entity Central Index Key	'0001179755	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	44,665,340

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
ASSETS	'	'
Fixed maturity investments, available for sale at fair value (amortized cost: $4,748,798 and $4,802,580 at March 31, 2014 and December 31, 2013, respectively)	$4,794,445	$4,823,964
Short-term investments, available for sale at fair value (amortized cost: $46,160 and $35,029 at March 31, 2014 and December 31, 2013, respectively)	46,167	35,028
Equity securities, available for sale at fair value (cost: $245,036 and $227,828 at March 31, 2014 and December 31, 2013, respectively)	271,530	252,466
Other investments	621,914	617,478
Total investments	5,734,056	5,728,936
Cash and cash equivalents	916,665	845,851
Premiums receivable, net	1,265,371	669,198
Insurance and reinsurance balances receivable	136,733	127,722
Deferred acquisition costs	231,167	186,027
Prepaid reinsurance premiums	443,498	187,209
Reinsurance recoverables on unpaid losses	534,335	593,755
Reinsurance recoverable on paid losses	59,784	164,220
Accrued investment income	23,161	24,104
Goodwill and intangible assets	163,761	165,378
Deferred tax asset	48,496	51,703
Net receivable on sales of investments	83,445	54,910
Other assets	154,310	179,109
Total assets	9,794,782	8,978,122
LIABILITIES	'	'
Reserve for losses and loss expenses	3,847,774	4,002,259
Reserve for unearned premiums	1,678,233	1,018,851
Deposit liabilities	18,684	19,458
Reinsurance balances payable	307,569	181,061
Debt	527,539	527,478
Net payable on purchases of investments	239,313	129,047
Other liabilities	174,561	213,419
Total liabilities	6,793,673	6,091,573
Commitments and contingent liabilities	'	'
SHAREHOLDERS' EQUITY	'	'
Preferred shares Series A and B, total liquidation preference $430,000 (2013 - $430,000)	17,200	17,200
Common shares Ordinary - 44,600,821 issued and outstanding (2013 - 44,368,742)	44,601	44,369
Additional paid-in capital	575,684	569,116
Accumulated other comprehensive income	89,359	62,731
Retained earnings	2,274,265	2,193,133
Total shareholders' equity	3,001,109	2,886,549
Total liabilities and shareholders' equity	$9,794,782	$8,978,122

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Available for Sale Securities	'	'
Available for sale securities, fixed maturity investments, amortized cost	$4,748,798	$4,802,580
Available for sale, short-term investments, amortized cost	46,160	35,029
Equity securities, cost	245,036	227,828
Shareholders' Equity	'	'
Preferred stock, aggregate liquidation preference	$430,000	$430,000
Common stock, shares issued	44,600,821	44,368,742
Common stock, shares outstanding	44,600,821	44,368,742

Condensed_Consolidated_Stateme

Condensed Consolidated Statements Of Income And Comprehensive Income (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenues	'	'
Gross premiums written	$1,157,515	$1,177,362
Ceded premiums written	-358,810	-268,447
Net premiums written	798,705	908,915
Change in unearned premiums	-402,439	-488,798
Net premiums earned	396,266	420,117
Net investment income	40,990	49,305
Net realized and unrealized investment gains	4,872	6,235
Total other-than-temporary impairment losses	-111	-806
Portion of loss recognized in other comprehensive income (loss)	0	0
Net impairment losses recognized in earnings	-111	-806
Other underwriting (loss) income	-1,238	749
Total revenues	440,779	475,600
Expenses	'	'
Net losses and loss expenses	176,896	218,970
Acquisition expenses	72,157	71,636
General and administrative expenses	73,206	66,478
Amortization of intangibles	1,617	2,101
Net foreign exchange losses	2,964	2,927
Interest expense	9,051	9,038
Total expenses	335,891	371,150
Income before income taxes	104,888	104,450
Income tax expense	-408	-4,151
Net income	104,480	100,299
Preferred dividends	-8,188	-8,188
Net income available to common and participating common shareholders	96,292	92,111
Comprehensive income	'	'
Net income	104,480	100,299
Other comprehensive income (loss)	'	'
Net unrealized holding gains (losses) on investments arising during the period (net of other-than-temporary impairment losses recognized in other comprehensive income (loss), reclassification adjustment and applicable deferred income taxes of ($2,435) and $1,298 for the three months ended March 31, 2014 and 2013, respectively)	23,380	-4,846
Foreign currency translation adjustments	3,225	-10,194
Reclassification adjustment for net losses on derivative designated as cash flow hedge included in net income	23	16
Net current period other comprehensive income (loss)	26,628	-15,024
Comprehensive income	$131,108	$85,275
Per share data	'	'
Basic earnings per common share	$2.17	$2.13
Diluted earnings per common share	$2.17	$2.13
Dividend per common share	$0.34	$0.32

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements Of Income And Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Condensed Consolidated Statements Of Income And Comprehensive Income	'	'
Other comprehensive income (loss), net unrealized holding gains (losses) on investments arising during the period, tax	($2,435)	$1,298

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements Of Changes In Shareholders' Equity (USD $)	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-In Capital [Member]	Cumulative Foreign Currency Translation Adjustments [Member]	Unrealized Holding Gains On Investments, Net Of Deferred Taxes [Member]	Accumulated Derivative Loss On Cash Flow Hedging Instruments [Member]	Total Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
In Thousands	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-In Capital [Member]				Total Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
Balance, beginning of period at Dec. 31, 2012	'	$17,200	$43,116	$527,915	$12,676	$141,731	($1,944)	'	$1,969,903
Net income	100,299	'	'	'	'	'	'	'	100,299
Issuance of common shares net of forfeitures	'	'	276	313	'	'	'	'	'
Repurchase of common shares and share equivalents	'	'	-223	-9,781	'	'	'	'	'
Settlement of equity awards	-2,923	'	'	-2,923	'	'	'	'	'
Stock-based compensation expense	'	'	'	4,733	'	'	'	'	'
Foreign currency translation adjustments	-10,194	'	'	'	-10,194	'	'	'	'
Net unrealized holding gains (losses) arising during the period, net of other-than-temporary impairment losses and reclassification adjustment	-4,846	'	'	'	'	-4,846	'	'	'
Net change from current period hedging transactions, net of reclassification adjustment	'	'	'	'	'	'	16	'	'
Dividends on preferred shares	-8,188	'	'	'	'	'	'	'	-8,188
Dividends on common shares	'	'	'	'	'	'	'	'	-13,829
Balance, end of period at Mar. 31, 2013	2,766,250	17,200	43,169	520,257	2,482	136,885	-1,928	137,439	2,048,185
Balance, beginning of period at Dec. 31, 2013	2,886,549	17,200	44,369	569,116	18,636	45,950	-1,855	'	2,193,133
Net income	104,480	'	'	'	'	'	'	'	104,480
Issuance of common shares net of forfeitures	'	'	232	131	'	'	'	'	'
Repurchase of common shares and share equivalents	'	'	0	0	'	'	'	'	'
Settlement of equity awards	-3,768	'	'	-3,768	'	'	'	'	'
Stock-based compensation expense	'	'	'	10,205	'	'	'	'	'
Foreign currency translation adjustments	3,225	'	'	'	3,225	'	'	'	'
Net unrealized holding gains (losses) arising during the period, net of other-than-temporary impairment losses and reclassification adjustment	23,380	'	'	'	'	23,380	'	'	'
Net change from current period hedging transactions, net of reclassification adjustment	'	'	'	'	'	'	23	'	'
Dividends on preferred shares	-8,188	'	'	'	'	'	'	'	-8,188
Dividends on common shares	'	'	'	'	'	'	'	'	-15,160
Balance, end of period at Mar. 31, 2014	$3,001,109	$17,200	$44,601	$575,684	$21,861	$69,330	($1,832)	$89,359	$2,274,265

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows (used in) provided by operating activities	'	'
Net income	$104,480	$100,299
Adjustments to reconcile net income to net cash (used in) provided by operating activities:	'	'
Amortization of net premium on investments	12,240	14,103
Amortization of other intangibles and depreciation	4,726	4,703
Net realized and unrealized investment gains	-4,872	-6,235
Net impairment losses recognized in earnings	111	806
Deferred taxes	772	3,295
Stock-based compensation expense	10,205	4,733
Equity in earnings of other investments	-13,542	-23,059
Premiums receivable, net	-596,173	-591,626
Insurance and reinsurance balances receivable	-9,011	-559
Deferred acquisition costs	-45,140	-44,701
Prepaid reinsurance premiums	-256,289	-173,364
Reinsurance recoverable on unpaid losses	59,420	103,207
Reinsurance recoverable on paid losses	104,436	71,268
Accrued investment income	943	2,301
Other assets	417	4,068
Reserve for losses and loss expenses	-154,485	-214,340
Reserve for unearned premiums	659,382	660,639
Deposit liabilities	-774	313
Reinsurance balances payable	126,508	92,205
Other liabilities	-28,950	15,437
Net cash (used in) provided by operating activities	-25,596	23,493
Cash flows provided by (used in) investing activities:	'	'
Proceeds from sales of available for sale investments	1,110,582	458,134
Proceeds from maturities and calls on available for sale investments	141,879	205,928
Proceeds from the redemption of other investments	13,780	7,880
Purchases of available for sale investments	-1,151,127	-886,054
Purchases of other investments	-4,674	-21,990
Net settlements of other assets	17,099	2,896
Purchases of fixed assets	-7,427	-4,581
Net cash flows provided by (used in) investing activities	120,112	-237,787
Cash flows used in financing activities	'	'
Issuance of common shares net of forfeitures	309	551
Repurchase of common shares	0	-10,004
Settlement of equity awards	-3,768	-2,923
Proceeds from issuance of debt	138	242
Repayments and repurchases of debt	-130	-209
Dividends on preferred shares	-8,188	-8,188
Dividends on common shares	-15,159	-13,829
Net cash flows used in financing activities	-26,798	-34,360
Effect of exchange rate changes on cash and cash equivalents	3,096	-18,178
Net increase (decrease) in cash and cash equivalents	70,814	-266,832
Cash and cash equivalents, beginning of period	845,851	1,124,019
Cash and cash equivalents, end of period	$916,665	$857,187

General

General	3 Months Ended
General	Mar. 31, 2014
General	'
General	'
	1. General

	Endurance Specialty Holdings Ltd. (“Endurance Holdings” or 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:
		Operating Subsidiaries	Domicile
		Endurance Specialty Insurance Ltd.	Bermuda
		Endurance Worldwide Insurance Limited	England
		Endurance Reinsurance Corporation of America	Delaware
		Endurance American Insurance Company	Delaware
		Endurance American Specialty Insurance Company	Delaware
		Endurance Risk Solutions Assurance Co.	Delaware
		American Agri-Business Insurance Company	Texas

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	3 Months Ended
Summary Of Significant Accounting Policies	Mar. 31, 2014
Summary Of Significant Accounting Policies	'
Summary Of Significant Accounting Policies	'
	2. Summary of significant accounting policies
	The accompanying unaudited condensed consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States 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, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. The unaudited condensed consolidated financial statements include the accounts of Endurance Holdings and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated on consolidation. Management is required to make estimates and assumptions that affect the amounts reported in the unaudited condensed 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, 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, 2013 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 unaudited condensed 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, 2013 contained in Endurance Holdings' Annual Report on Form 10-K for the fiscal year ended December 31, 2013 (the “2013 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 2013 Form 10-K.
	In July 2013, the FASB issued ASU 2013-11 “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”). ASU 2013-11 provides guidance on the presentation of unrecognized tax benefits to better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. ASU 2013-11 was effective for annual and interim reporting periods beginning after December 15, 2013, with both early adoption and retrospective application permitted. The Company adopted this standard effective January 1, 2014. This standard did not have a material impact on the Company's consolidated financial statements.

Investments

Investments	3 Months Ended
Investments	Mar. 31, 2014
Investments	'
Investments	'
	3. Investments

	Composition of Net Investment Income and of Invested Assets

	The components of net investment income for the three months ended March 31, 2014 and 2013 are as follows:
											2014			2013
			Available for sale investments							$	30,327		$	29,481
			Other investments								13,542			23,059
			Cash and cash equivalents								786			451
										$	44,655		$	52,991
			Investment expenses								-3,665			-3,686
			Net investment income							$	40,990		$	49,305
	The following table summarizes the composition of the investment portfolio by investment type at March 31, 2014 and December 31, 2013:
					31-Mar-14						31-Dec-13
			Type of Investment		Fair Value		Percentage				Fair Value		Percentage
			Fixed maturity investments	$	4,794,445		73.8	%		$	4,823,964		74.2	%
			Cash and cash equivalents⁽¹⁾		760,797		11.7	%			771,714		11.9	%
			Other investments⁽²⁾		621,914		9.6	%			617,478		9.5	%
			Short-term investments		46,167		0.7	%			35,028		0.5	%
			Equity securities		271,530		4.2	%			252,466		3.9	%
			Total	$	6,494,853		100	%		$	6,500,650		100	%

			(1) Includes net receivable on sales of investments and net payable on purchases of investments.
			(2) Consists of investments in alternative funds and specialty funds.
	3. Investments, cont'd.

	The following table summarizes the composition by investment rating of the fixed maturity and short-term investments at March 31, 2014 and December 31, 2013. In some cases, where bonds are unrated, the rating of the issuer has been applied.
					31-Mar-14						31-Dec-13
			Ratings⁽¹⁾		Fair Value		Percentage				Fair Value		Percentage
			U.S. government and agencies securities	$	627,748		13	%		$	769,343		15.8	%
			AAA / Aaa		996,691		20.6	%			972,820		20	%
			AA / Aa		1,789,744		36.9	%			1,771,156		36.5	%
			A / A		935,778		19.3	%			895,549		18.4	%
			BBB		385,759		8	%			363,722		7.5	%
			Below BBB		81,104		1.7	%			66,791		1.4	%
			Not rated		23,788		0.5	%			19,611		0.4	%
			Total	$	4,840,612		100	%		$	4,858,992		100	%

			(1) The credit rating for each security reflected above was determined based on the rating assigned to the individual security by Standard & Poor's Financial Services LLC ("Standard & Poor's"). If a rating is not supplied by Standard & Poor's, the equivalent rating supplied by either Moody's Investors Service, Inc. ("Moody's") or Fitch Ratings, Inc. is used.
	Contractual maturities of the Company's fixed maturity and short-term investments are shown below as of March 31, 2014 and December 31, 2013. 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.
				31-Mar-14						31-Dec-13
					Amortized						Amortized
					Cost			Fair Value			Cost			Fair Value
		Due within one year		$	177,361		$	178,464		$	144,814		$	145,653
		Due after one year through five years			1,665,241			1,674,208			1,808,001			1,815,240
		Due after five years through ten years			311,055			313,796			290,391			288,486
		Due after ten years			43,429			45,209			26,344			26,937
		Residential mortgage-backed securities			1,176,805			1,183,421			1,202,145			1,197,221
		Commercial mortgage-backed securities			950,405			971,959			936,358			952,887
		Asset-backed securities			470,662			473,555			429,556			432,568
		Total		$	4,794,958		$	4,840,612		$	4,837,609		$	4,858,992
	3. Investments, cont'd.

	In addition to the Company's fixed maturity, short-term and equity investments, the Company invests in (i) hedge funds and private investment funds that generally invest in senior secured bank debt, high yield credit, distressed debt, distressed real estate, derivatives, and equity long/short strategies (“alternative funds”) and (ii) high yield loan and convertible debt funds (“specialty funds”). The Company's alternative funds and specialty funds are recorded on the Company's balance sheet as “other investments.” At March 31, 2014 and December 31, 2013, the Company had invested, net of capital returned, a total of $433.4 million and $440.9 million, respectively, in other investments. At March 31, 2014 and December 31, 2013, the carrying value of other investments was $621.9 million and $617.5 million, respectively. The following table summarizes the composition and redemption restrictions of other investments as of March 31, 2014 and December 31, 2013:
		31-Mar-14			Market Value			Unfunded Commitments			Ineligible for Redemption over next 12 months
		Alternative funds
			Hedge funds	$	399,911		$	-		$	49,324
			Private investment funds		63,108			69,410			63,108
		Total alternative funds			463,019			69,410			112,432

		Specialty funds
			High yield loan funds		112,343			-			-
			Convertible debt funds		46,552			-			-
	Total specialty funds			158,895			-			-
	Total other investments		$	621,914		$	69,410		$	112,432
	31-Dec-13			Market Value			Unfunded Commitments			Ineligible for Redemption in 2014
	Alternative funds
		Hedge funds	$	401,438		$	-		$	47,406
		Private investment funds		59,703			57,997			59,703
	Total alternative funds			461,141			57,997			107,109

	Specialty funds
		High yield loan funds		111,254			-			-
		Convertible debt funds		45,083			-			-
	Total specialty funds			156,337			-			-
	Total other investments		$	617,478		$	57,997		$	107,109
Hedge funds – The redemption frequency of the hedge funds range from monthly to biennially with notice periods from 30 to 90 days. Over one year, it is estimated that the Company can liquidate approximately 87.7% of the hedge fund portfolio, with the remainder over the following two years.

3. Investments, cont'd.

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.

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 ranges from monthly to quarterly with notice periods from 30 to 90 days.

Convertible debt funds – There are generally no restrictions on the Company's right to redeem its interest in convertible debt funds with the exception of certain redemption frequency and notice requirements. The redemption frequency of these funds is monthly with a required notice period of 5 days.
Net Realized and Unrealized Investment Gains
Realized and unrealized investment gains and losses are recognized in earnings using the first in, first out method. The analysis of net realized and unrealized investment gains and the change in the fair value of investment-related derivative financial instruments for the three months ended March 31, 2014 and 2013 are as follows:
			2014			2013
	Gross realized gains on investment sales	$	10,247		$	7,420
	Gross realized losses on investment sales		-5,984			-1,463
	Change in fair value of derivative financial instruments⁽¹⁾		609			278
	Net realized and unrealized investment gains	$	4,872		$	6,235
	(1) For additional information on the Company's derivative financial instruments, see Note 7.
3. Investments, cont'd.

Unrealized Gains and Losses and Other-than-temporary Impairments

The Company classifies its investments in fixed maturity investments, short-term investments and equities as available for sale. The amortized cost, fair value and related gross unrealized gains and losses and non-credit other-than-temporary impairment (“OTTI”) losses on the Company's securities classified as available for sale at March 31, 2014 and December 31, 2013 are as follows:
						Gross			Gross
			Amortized			Unrealized			Unrealized						Non-Credit
	31-Mar-14		Cost			Gains			Losses			Fair Value			OTTI ⁽²⁾
	Fixed maturity investments
		U.S. government and agencies securities	$	626,491		$	6,126		$	-4,869		$	627,748		$	-
		U.S. state and municipal securities		28,217			118			-203			28,132			-
		Foreign government securities		204,003			1,396			-974			204,425			-
		Government guaranteed corporate securities		49,409			242			-25			49,626			-
		Corporate securities		1,242,806			16,533			-3,760			1,255,579			-
		Residential mortgage-backed securities		1,176,805			18,916			-12,300			1,183,421			-4,161
		Commercial mortgage-backed securities⁽¹⁾		950,405			26,246			-4,692			971,959			-47
		Asset-backed securities		470,662			3,551			-658			473,555			-160
	Total fixed maturity investments		$	4,748,798		$	73,128		$	-27,481		$	4,794,445		$	-4,368
	Short-term investments			46,160			16			-9			46,167			-
	Total fixed income investments		$	4,794,958		$	73,144		$	-27,490		$	4,840,612		$	-4,368

	Equity securities
		Equity investments	$	171,629		$	25,156		$	-2,202		$	194,583		$	-
		Emerging market debt funds		60,250			1,540			-			61,790			-
		Preferred equity investments		7,829			2,016			-17			9,828			-
		Short-term fixed income fund		5,328			1			-			5,329			-
	Total equity securities		$	245,036		$	28,713		$	-2,219		$	271,530		$	-

-1	Balances include amounts related to collateralized debt obligations held with total fair values of $17.1 million.
-2	Represents total OTTI recognized in accumulated other comprehensive income. It does not include the change in fair value subsequent to the impairment measurement date. At March 31, 2014, the gross unrealized loss related to fixed income investments for which a non-credit OTTI was recognized in accumulated other comprehensive income was nil.
							Gross			Gross
				Amortized			Unrealized			Unrealized						Non-Credit
		31-Dec-13		Cost			Gains			Losses			Fair Value			OTTI ⁽²⁾
		Fixed maturity investments
			U.S. government and agencies securities	$	771,227		$	5,735		$	-7,619		$	769,343		$	-
			U.S. state and municipal securities		27,138			111			-395			26,854			-
			Foreign government securities		183,650			1,003			-2,006			182,647			-
			Government guaranteed corporate securities		34,921			274			-50			35,145			-
			Corporate securities		1,217,585			16,225			-6,511			1,227,299			-
			Residential mortgage-backed securities		1,202,145			17,005			-21,929			1,197,221			-4,257
			Commercial mortgage-backed securities⁽¹⁾		936,358			24,673			-8,144			952,887			-47
			Asset-backed securities		429,556			3,902			-890			432,568			-163
		Total fixed maturity investments		$	4,802,580		$	68,928		$	-47,544		$	4,823,964		$	-4,467
		Short-term investments			35,029			1			-2			35,028			-
		Total fixed income investments		$	4,837,609		$	68,929		$	-47,546		$	4,858,992		$	-4,467

		Equity securities
			Equity investments	$	152,525		$	24,139		$	-1,995		$	174,669		$	-
			Emerging market debt funds		60,250			594			-			60,844			-
			Preferred equity investments		6,325			1,977			-79			8,223			-
			Short-term fixed income funds		8,728			2			-			8,730			-
		Total equity securities		$	227,828		$	26,712		$	-2,074		$	252,466		$	-

-1	Balances include amounts related to collateralized debt obligations held with total fair values of $18.7 million.
-2	Represents total OTTI recognized in accumulated other comprehensive income. It does not include the change in fair value subsequent to the impairment measurement date. At December 31, 2013, the gross unrealized loss related to fixed income investments for which a non-credit OTTI was recognized in accumulated other comprehensive income was $0.1 million.
The following tables summarize, for all available for sale securities in an unrealized loss position at March 31, 2014 and December 31, 2013, 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
						Unrealized			Fair			Unrealized			Fair			Unrealized		Fair
	31-Mar-14					Losses⁽¹⁾			Value			Losses⁽¹⁾			Value			Losses⁽¹⁾		Value
	Fixed maturity investments
		U.S. government and agencies
			securities		$	-4,601		$	224,226		$	-268		$	9,546		$	-4,869	$	233,772
		U.S. state and municipal
			securities			-203			14,959			-			-			-203		14,959
		Foreign government securities				-927			93,615			-47			4,391			-974		98,006
		Government guaranteed
			corporate securities			-25			29,341			-			-			-25		29,341
		Corporate securities				-3,485			359,495			-275			20,341			-3,760		379,836
		Residential mortgage-backed
			securities			-9,124			390,553			-3,176			82,688			-12,300		473,241
		Commercial mortgage-backed
			securities			-3,778			229,417			-914			31,011			-4,692		260,428
		Asset-backed securities				-508			140,501			-150			10,549			-658		151,050
	Total fixed maturity investments				$	-22,651		$	1,482,107		$	-4,830		$	158,526		$	-27,481	$	1,640,633
	Short-term investments					-9			36,403			-			-			-9		36,403
	Total fixed income investments				$	-22,660		$	1,518,510		$	-4,830		$	158,526		$	-27,490	$	1,677,036

	Equity securities
		Equity investments			$	-1,638		$	27,109		$	-564		$	8,565		$	-2,202	$	35,674
		Preferred equity investments				-17			1,053			-			-			-17		1,053
	Total equity securities				$	-1,655		$	28,162		$	-564		$	8,565		$	-2,219	$	36,727

-1	Gross unrealized losses include unrealized losses on non-OTTI securities recognized in accumulated other comprehensive income at March 31, 2014.
As of March 31, 2014, 707 available for sale securities were in an unrealized loss position aggregating $29.7 million. Of those, 88 securities with aggregated unrealized losses of $5.4 million at March 31, 2014 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
						Unrealized			Fair			Unrealized			Fair			Unrealized		Fair
	31-Dec-13					Losses⁽¹⁾			Value			Losses⁽¹⁾			Value			Losses⁽¹⁾		Value
	Fixed maturity investments
		U.S. government and agencies
			securities		$	-7,359		$	382,593		$	-260		$	6,050		$	-7,619	$	388,643
		U.S. state and municipal
			securities			-395			20,452			-			-			-395		20,452
		Foreign government securities				-1,981			139,503			-25			5,261			-2,006		144,764
		Government guaranteed
			corporate securities			-50			13,326			-			-			-50		13,326
		Corporate securities				-5,959			478,287			-552			28,690			-6,511		506,977
		Residential mortgage-backed
			securities			-17,572			524,731			-4,357			102,446			-21,929		627,177
		Commercial mortgage-backed
			securities			-7,664			377,969			-480			19,183			-8,144		397,152
		Asset-backed securities				-738			174,455			-152			7,011			-890		181,466
	Total fixed maturity investments				$	-41,718		$	2,111,316		$	-5,826		$	168,641		$	-47,544	$	2,279,957
	Short-term investments					-2			2,468			-			-			-2		2,468
	Total fixed income investments				$	-41,720		$	2,113,784		$	-5,826		$	168,641		$	-47,546	$	2,282,425

	Equity securities
		Equity investments			$	-1,995		$	36,751		$	-		$	-		$	-1,995	$	36,751
		Preferred equity investments				-79			2,987			-			-			-79		2,987
	Total equity securities				$	-2,074		$	39,738		$	-		$	-		$	-2,074	$	39,738

-1	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive income at December 31, 2013.
As of December 31, 2013, 880 available for sale securities were in an unrealized loss position aggregating $49.6 million. Of those, 71 securities with aggregated unrealized losses of $5.8 million had been in a continuous unrealized loss position for twelve months or greater.
The analysis of OTTI for the three months ended March 31, 2014 and 2013 is as follows:
			2014			2013
	Total other-than-temporary impairment losses	$	-111		$	-806
	Portion of loss recognized in other comprehensive income (loss)		-			-
	Net impairment losses recognized in earnings	$	-111		$	-806
Of the $0.1 million (2013: $0.8 million) of OTTI losses recognized by the Company in the first quarter of 2014, the majority of it related to equity securities for which the Company does not expect the value to recover. The unrealized losses on the Company's fixed income securities at March 31, 2014 and December 31, 2013 were primarily due to an increase in interest rates and widening of credit spreads, rather than any actual credit losses on these securities. At March 31, 2014, the Company did not have the intent to sell any of the remaining fixed income securities in an unrealized loss position and determined that it was unlikely that the Company would be required to sell 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 these securities to be other-than-temporarily impaired at March 31, 2014.

The following table provides a roll-forward of the amount related to credit losses for the Company's available for sale investments recognized in earnings for which a portion of an OTTI loss was recognized in accumulated other comprehensive income for the three months ended March 31, 2014 and 2013:
				2014			2013
	Beginning balance			$	-1,553		$	-2,000
	Addition for the amount related to the credit loss for which an other-than-temporary
		impairment was not previously recognized			-			-
	Addition for the amount related to the credit loss for which an other-than-temporary
		impairment was previously recognized			-			-
	Reductions for increases in cash flows expected to be collected that are recognized
		over the remaining life of the security			-			-
	Reductions for securities sold during the period				33			117
	Ending balance			$	-1,520		$	-1,883
Variable Interest Entities

Entities that do not have sufficient equity at risk to allow the entity to finance its activities without additional financial support or in which the equity investors, as a group, do not have the characteristics of a controlling financial interest are referred to as variable interest entities (“VIE”). A VIE is consolidated by the variable interest holder that is determined to have the controlling financial interest (primary beneficiary) as a result of having both the power to direct the activities of a VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE. 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 is involved in the normal course of business with VIEs primarily 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 determined that it was not the primary beneficiary for any of these investments as of March 31, 2014. 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.

Fair_Value_Measurement

Fair Value Measurement	3 Months Ended
Fair Value Measurement	Mar. 31, 2014
Fair Value Measurement	'
Fair Value Measurement	'
	4. Fair value measurement

	The Company determines the fair value of the fixed maturity investments, short-term investments, equity securities, other investments, 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.



	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.



	Structured securities including agency and non-agency, residential and commercial, mortgage and asset-backed securities – 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 investments – Other investments are comprised of alternative funds and specialty funds and are generally priced on net asset values (“NAV”) received from the fund managers or administrators. Due to the timing of the delivery of the final NAV by certain of the fund managers, valuations of certain alternative funds and specialty funds are estimated based on the most recently available information, including period end NAVs, period end estimates, or, in some cases, prior month or prior quarter NAVs. As this valuation technique incorporates both observable and significant unobservable inputs, the Company generally classifies the fair value of its other investments in Level 3.



	Debt – Outstanding debt consists of the Company's 6.15% Senior Notes due October 15, 2015 and the 7.0% Senior Notes due July 15, 2034 (the “Senior Notes”). The fair values of these securities were obtained from a third party pricing service and pricing was 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 are classified in Level 2.


	The carrying values of cash and cash equivalents, accrued investment income, net receivable on sales of investments, net payable on purchases of investments and other financial instruments not described above approximated their fair values at March 31, 2014.

	Transfers between levels are assumed to occur at the end of each period.

	The following table sets forth the Company's available for sale investments, other investments, other assets and liabilities and debt categorized by the level within the hierarchy in which the fair value measurements fall at March 31, 2014:
					Fair Value Measurements at March 31, 2014
								Quoted
								Prices in
								Active
								Markets			Significant
								for			Other			Significant
					Total at			Identical			Observable			Unobservable
					March 31,			Assets			Inputs			Inputs
					2014			(Level 1)			(Level 2)			(Level 3)
		Assets
		Fixed maturity investments
			U.S. government and agencies securities	$	627,748		$	3,634		$	624,114		$	-
			U.S. state and municipal securities		28,132			-			28,132			-
			Foreign government securities		204,425			-			204,425			-
			Government guaranteed corporate securities		49,626			-			49,626			-
			Corporate securities		1,255,579			-			1,254,842			737
			Residential mortgage-backed securities		1,183,421			-			1,183,386			35
			Commercial mortgage-backed securities		971,959			-			966,775			5,184
			Asset-backed securities		473,555			-			470,526			3,029
		Total fixed maturity investments		$	4,794,445		$	3,634		$	4,781,826		$	8,985
		Equity securities
			Equity investments		194,583			136,292			58,291			-
		Emerging market debt funds		61,790			-			61,790			-
		Preferred equity investments		9,828			-			9,828			-
		Short-term fixed income fund		5,329			5,329			-			-
	Total equity securities		$	271,530		$	141,621		$	129,909		$	-
	Short-term investments			46,167			-			46,167			-
	Other investments			621,914			-			-			621,914
	Other assets (see Note 7)			74,974			-			66,442			8,532
	Total assets		$	5,809,030		$	145,255		$	5,024,344		$	639,431
	Liabilities
	Other liabilities (see Note 7)		$	32,209		$	-		$	18,761		$	13,448
	Debt			594,413			-			594,413			-
	Total liabilities		$	626,622		$	-		$	613,174		$	13,448
During the three months ended March 31, 2014, $2.1 million of commercial mortgage-backed securities were transferred into Level 3 as no observable inputs were available, and $0.3 million of commercial mortgage-backed securities were transferred out of Level 3 during the period as market activity for these securities increased and observable inputs became available. During the three months ended March 31, 2014, there were no transfers into or out of Level 1.
4. Fair value measurement, cont'd.


The following table sets forth the Company's available for sale investments, other investments, other assets and liabilities and debt categorized by the level within the hierarchy in which the fair value measurements fall at December 31, 2013:
				Fair Value Measurements at December 31, 2013
							Quoted
							Prices in
							Active			Significant
							Markets for			Other			Significant
				Total at			Identical			Observable			Unobservable
				December 31,			Assets			Inputs			Inputs
				2013			(Level 1)			(Level 2)			(Level 3)
	Assets
	Fixed maturity investments
		U.S. government and agencies securities	$	769,343		$	20,248		$	749,095		$	-
		U.S. state and municipal securities		26,854			-			26,854			-
		Foreign government securities		182,647			-			182,647			-
		Government guaranteed corporate securities		35,145			-			35,145			-
		Corporate securities		1,227,299			-			1,226,553			746
		Residential mortgage-backed securities		1,197,221			-			1,196,973			248
		Commercial mortgage-backed securities		952,887			-			949,547			3,340
		Asset-backed securities		432,568			-			429,574			2,994
	Total fixed maturity investments		$	4,823,964		$	20,248		$	4,796,388		$	7,328
	Equity securities
		Equity investments		174,669			117,776			56,893			-
		Emerging market debt funds		60,844			-			60,844			-
		Preferred equity investments		8,223			-			8,223			-
		Short-term fixed income fund		8,730			8,730			-			-
	Total equity securities		$	252,466		$	126,506		$	125,960		$	-
	Short-term investments			35,028			-			35,028			-
	Other investments			617,478			-			-			617,478
	Other assets (see Note 7)			108,272			-			94,234			14,038
	Total assets		$	5,837,208		$	146,754		$	5,051,610		$	638,844
	Liabilities
	Other liabilities (see Note 7)			49,452			-			29,883			19,569
	Debt			575,115			-			575,115			-
	Total liabilities		$	624,567		$	-		$	604,998		$	19,569
Level 3 assets represented 11.0% and 10.9% of the Company's total available for sale investments, other investments and derivative instruments at March 31, 2014 and December 31, 2013, respectively. Level 3 securities are primarily comprised of non-agency commercial mortgage-backed securities, asset-backed securities, investments in alternative and specialty funds, and weather derivatives. The NAV used to measure the fair value of the Company's other investments are generally derived from the underlying investments held within the funds. Although the Company does not have direct access to detailed financial information related to the underlying investments of the funds, the Company obtains and reviews fund financial statements, internal control review reports, and industry benchmarking reports to determine the reasonability of the NAV of the funds. There were no material changes in the Company's valuation techniques for the three months ended March 31, 2014.
Other assets and other liabilities measured at fair value include assets of $8.5 million (2013 - $14.0 million) and liabilities of $13.4 million (2013 - $19.6 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, if applicable, dependent on contract requirements and commodity type:

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 detrended 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 impact fair value.

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 liability classified in Level 3 which is measured at fair value on a recurring basis at March 31, 2014:
			31-Mar-14
			Fair Value (Level 3)		Valuation Techniques		Unobservable Inputs		Low			High			Weighted Average or Actual

	Net weather and energy related derivative liability	$	4,916		Historical Analysis and Simulation		Correlation			0			1		Actual
							Weather curve			2,155			3,500		Actual
							Commodity curve		$	2.95		$	8		Actual
4. Fair value measurement, cont'd.
There were no impairment losses on Level 3 securities recognized in earnings for the three months ended March 31, 2014 or 2013.

The following table presents 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, 2014 and 2013, respectively:
			Three Months Ended March 31, 2014
			Fixed maturity investments			Other investments			Other assets			Total assets			Other liabilities
	Level 3, beginning of period		$	7,328		$	617,478		$	14,038		$	638,844		$	-19,569
	Total equity income and realized gains included in earnings			17			19,186			-			19,203			-
	Total equity losses and losses included in earnings			-26			-5,645			-			-5,671			-
	Total income included in other underwriting (loss) income			-			-			3,975			3,975			7,426
	Total loss included in other underwriting (loss) income			-			-			-6,888			-6,888			-4,776
	Change in unrealized gains included in other comprehensive income (loss)			111			-			-			111			-
	Change in unrealized losses included in other comprehensive income (loss)			-115			-			-			-115			-
	Purchases			-			4,674			-			4,674			-
	Issues			-			-			640			640			-1,280
	Sales			-184			-13,779			-			-13,963			-
	Settlements			-			-			-3,233			-3,233			4,751
	Transfers in to Level 3			2,117			-			-			2,117			-
	Transfers out of Level 3			-263			-			-			-263			-
	Level 3, end of period		$	8,985		$	621,914		$	8,532		$	639,431		$	-13,448
			Three Months Ended March 31, 2013
			Fixed maturity investments			Other investments			Other assets			Total assets			Other liabilities
	Level 3, beginning of period		$	8,497		$	517,546		$	882		$	526,925		$	-1,922
	Total equity income and realized gains included in earnings			5			25,483			-			25,488			-
	Total equity losses and losses included in earnings			-			-2,424			-			-2,424			-
	Total income included in other underwriting (loss) income			-			-			-			-			2,342
	Total loss included in other underwriting (loss) income			-			-			-1,176			-1,176			-
	Change in unrealized gains included in other comprehensive income (loss)			84			-			-			84			-
	Change in unrealized losses included in other comprehensive income (loss)			-54			-			-			-54			-
	Purchases			-			21,990			-			21,990			-
	Issues			-			-			300			300			-432
	Sales			-1,926			-7,880			-			-9,806			-
	Transfers in to Level 3			3,264			-			-			3,264			-
	Transfers out of Level 3			-56			-			-			-56			-
	Level 3, end of period		$	9,814		$	554,715		$	6		$	564,535		$	-12

Earnings_Per_Share

Earnings Per Share	3 Months Ended
Earnings Per Share	Mar. 31, 2014
Earnings Per Share	'
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 that receive cash dividends, according to dividends declared and participation rights in undistributed earnings. Net income available to 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.
	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 share for the three months ended March 31, 2014 and 2013:
						2014			2013
		Numerator:
			Net income available to common and participating
				common shareholders	$	96,292		$	92,111
			Less amount allocated to participating common shareholders ⁽¹⁾			-2,769			-1,510
			Net income allocated to common shareholders		$	93,523		$	90,601
		Denominator:
			Weighted average shares – basic			43,160,156			42,431,020

			Share equivalents:
				Options		-			11,799
				Restricted share units		286			1,117
			Weighted average shares – diluted			43,160,442			42,443,936

		Basic earnings per common share			$	2.17		$	2.13
		Diluted earnings per common share			$	2.17		$	2.13

		(1) Represents earnings attributable to holders of unvested restricted shares issued under the Company’s equity compensation plans that are
		considered participating. In periods of loss, no losses are allocated to participating common shareholders (unvested restricted shares).
	5. Earnings per share, cont'd.

	Endurance Holdings declared a dividend of $0.484375 per Series A preferred share and $0.46875 per Series B preferred share on February 14, 2014 (2013 - Series A: $0.484375, Series B: $0.46875). The Series A and Series B preferred share dividends were paid on March 17, 2014 to shareholders of record on February 28, 2014. Endurance Holdings also declared a dividend of $0.34 per common share on February 27, 2014 (2013 - $0.32). The dividend was paid on March 31, 2014 to shareholders of record on March 17, 2014.
			Three Months Ended March 31,
			2014			2013
		Dividends declared per Series A preferred share	$	0.484375		$	0.484375
		Dividends declared per Series B preferred share	$	0.46875		$	0.46875
		Dividends declared per common share	$	0.34		$	0.32

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	3 Months Ended
Accumulated Other Comprehensive Income	Mar. 31, 2014
Accumulated Other Comprehensive Income	'
Accumulated Other Comprehensive Income	'
	6. Accumulated other comprehensive income

	The following table presents the changes in accumulated other comprehensive income balances by component for the three months ended March 31, 2014 and 2013:
			For the Three Months Ended March 31, 2014
			Loss on cash flow hedge			Unrealized gains on available-for-sale securities		Foreign currency items		Total
	Beginning balance		$	-1,855		$	45,950	$	18,636	$	62,731
		Other comprehensive income before reclassifications		-			27,665		3,225		30,890
		Amounts reclassified from accumulated other comprehensive income⁽¹⁾		23			-4,285		-		-4,262
	Net current period other comprehensive income			23			23,380		3,225		26,628
	Ending balance		$	-1,832		$	69,330	$	21,861	$	89,359

			For the Three Months Ended March 31, 2013
			Loss on cash flow hedge			Unrealized gains on available-for-sale securities		Foreign currency items		Total
	Beginning balance		$	-1,944		$	141,731	$	12,676	$	152,463
		Other comprehensive income (loss) before reclassifications		-			97		-10,194		-10,097
		Amounts reclassified from accumulated other comprehensive income⁽¹⁾		16			-4,943		-		-4,927
	Net current period other comprehensive income (loss)			16			-4,846		-10,194		-15,024
	Ending balance		$	-1,928		$	136,885	$	2,482	$	137,439

	(1) All amounts are net of tax.
	6. Accumulated other comprehensive income, cont'd.

	The following table presents the significant items reclassified out of accumulated other comprehensive income during the three months ended March 31, 2014 and 2013:
		Three Months Ended March 31, 2014
		Details about accumulated other comprehensive income components			Amount reclassified from accumulated other comprehensive income		Affected line item in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income
		Loss on cash flow hedge - Debt		$	23		Interest expense
					23		Total before income taxes
					-		Income tax expense
				$	23		Total net of income taxes

		Unrealized gains on available-for-sale securities		$	-4,263		Net realized and unrealized investment gains
					111		Net impairment losses recognized in earnings
					-4,152		Total before income taxes
					-133		Income tax expense
				$	-4,285		Total net of income taxes

		Three Months Ended March 31, 2013
		Details about accumulated other comprehensive income components			Amount reclassified from accumulated other comprehensive income		Affected line item in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income
		Loss on cash flow hedge - Debt		$	16		Interest expense
					16		Total before income taxes
					-		Income tax expense
				$	16		Total net of income taxes

		Unrealized gains on available-for-sale securities		$	-5,957		Net realized and unrealized investment gains
					806		Net impairment losses recognized in earnings
					-5,151		Total before income taxes
					208		Income tax expense
				$	-4,943		Total net of income taxes

Derivatives

Derivatives	3 Months Ended
Derivatives	Mar. 31, 2014
Derivatives	'
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 trading 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'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 investment gains, net foreign exchange losses and other underwriting (loss) income in the Condensed Consolidated Statements of Income and Comprehensive Income.

	The Company's derivatives are not designated as hedges under current accounting guidance. The Company invests a portion of its fixed maturity assets with a third party investment manager 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 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.

	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.

	Commodity Futures and Options – to economically hedge certain underwriting risks.

	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 of third parties. 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.


	The fair values and the related notional values of derivatives at March 31, 2014 and December 31, 2013 are noted below.
				31-Mar-14						31-Dec-13
							Notional					Notional
				Fair			Principal			Fair		Principal
				Value			Amount			Value		Amount
		Derivatives recorded in other assets
			Foreign exchange forward contracts	$	175		$	15,427		$	251	$	19,269
			Interest rate swaps		40			20,200			124		16,100
			Interest rate swaptions		1			24,361			39		24,338
			Interest rate futures		30			103,955			-		-
			TBAs		66,196			66,000			93,820		93,840
			Energy and weather contracts		8,532			51,757			14,038		53,986
			Total recorded in other assets	$	74,974					$	108,272

		Derivatives recorded in other liabilities
			Foreign exchange forward contracts	$	215		$	15,722		$	172	$	15,861
			Interest rate swaps		911			12,614			933		12,193
			Interest rate swaptions		-			27,861			543		361,455
			Interest rate futures		-			-			17		103,935
			TBAs		17,635			18,000			28,218		28,000
			Energy and weather contracts		13,448			61,655			19,569		66,113
			Total recorded in other liabilities	$	32,209					$	49,452

			Net derivative asset	$	42,765					$	58,820
	At March 31, 2014, the Company's derivative assets of $74.9 million (December 31, 2013 - $108.3 million) and liabilities of $32.2 million (December 31, 2013 - $49.4 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 a master netting agreement. At March 31, 2014 and December 31, 2013, none of the Company's derivative instruments were recorded on a net basis in the Condensed Consolidated Balance Sheets. See Note 10 for information on collateral pledged.

	7. Derivatives, cont'd.

	The gains and losses on the Condensed Consolidated Statements of Income and Comprehensive Income for derivatives for the three months ended March 31, 2014 and 2013 were as follows:
					2014			2013
		Total included in net foreign exchange losses from
			foreign exchange forward contracts		$	-227		$	161

		Interest rate futures			$	21		$	-
		Credit default swaps				-			3
		Interest rate swaps				-766			118
		Interest rate swaptions				429			175
		TBAs				925			-17
		Total included in net realized and unrealized investment gains			$	609		$	279

		Total included in other underwriting (loss) income from
			energy and weather contracts		$	-258		$	1,166

	Total gains from derivatives			$	124		$	1,606

StockBased_Employee_Compensati

Stock-Based Employee Compensation And Other Stock Plans	3 Months Ended
Stock-Based Employee Compensation And Other Stock Plans	Mar. 31, 2014
Stock-Based Employee Compensation And Other Stock Plans	'
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, share bonuses and other equity incentive awards to key employees.

	No options were granted, expired or vested during the quarters ended March 31, 2014 and 2013. No options were exercised during the quarter ended March 31, 2014. The total intrinsic value of options exercised during the quarter ended March 31, 2013 was $0.2 million. The Company received proceeds of $0.3 million from the exercise of options during the quarter ended March 31, 2013. The Company issued new ordinary shares in connection with the exercise of the above options. For the quarter ended March 31, 2014, compensation costs recognized in earnings for all options totaled $1.1 million (2013 - nil). At March 31, 2014, compensation costs not yet recognized related to unvested stock options was $4.6 million (2013 - nil).

	During the quarter ended March 31, 2014, the Company granted an aggregate of 335,771 (2013 – 343,384) restricted shares and restricted share units with weighted average grant date fair values of $17.6 million (2013 - $15.2 million). During the quarter ended March 31, 2014, the aggregate fair value of restricted shares and restricted share units that vested was $9.8 million (2013 - $9.1 million). For the quarter ended March 31, 2014, compensation costs recognized in earnings for all restricted shares and restricted share units were $9.1 million (2013 - $4.7 million). At March 31, 2014, compensation costs not yet recognized related to unvested restricted shares and restricted share units was $34.9 million (2013 - $15.3 million).

	The Company also has an Employee Share Purchase Plan under which employees of Endurance Holdings and certain of its subsidiaries may purchase Endurance Holdings' ordinary shares. For the quarter ended March 31, 2014, total expenses related to the Company's Employee Share Purchase Plan were approximately $54,000 (2013 - $38,000).

Segment_Reporting

Segment Reporting	3 Months Ended
Segment Reporting	Mar. 31, 2014
Segment Reporting	'
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
	Reinsurance segment lines of business
	• Catastrophe
	• Property
	• Casualty
	• Professional lines
	• Specialty

	Management measures 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 directly incurred by the segments are allocated primarily based on estimated consumption, headcount and other variables deemed relevant to the allocation of such expenses. 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, results and reserves for losses and loss expenses for the three months ended March 31, 2014:
					Three Months Ended March 31, 2014
						Insurance				Reinsurance				Total
			Revenues
				Gross premiums written		$	652,276			$	505,239			$	1,157,515
				Ceded premiums written			-309,249				-49,561				-358,810
				Net premiums written			343,027				455,678				798,705
				Net premiums earned			144,021				252,245				396,266
				Other underwriting loss			-				-1,238				-1,238
							144,021				251,007				395,028

			Expenses
				Net losses and loss expenses			88,533				88,363				176,896
				Acquisition expenses			12,261				59,896				72,157
				General and administrative expenses			41,288				31,918				73,206
							142,082				180,177				322,259
			Underwriting income			$	1,939			$	70,830			$	72,769

			Net loss ratio				61.5	%			35	%			44.6	%
			Acquisition expense ratio				8.5	%			23.7	%			18.2	%
			General and administrative expense ratio				28.7	%			12.7	%			18.5	%
			Combined ratio				98.7	%			71.4	%			81.3	%

			Reserve for losses and loss expenses			$	2,023,819			$	1,823,955			$	3,847,774
	9. Segment reporting, cont'd.

	The following table provides a summary of segment revenues, results and reserves for losses and loss expenses for the three months ended March 31, 2013:
					Three Months Ended March 31, 2013
							Insurance				Reinsurance				Total
			Revenues
				Gross premiums written		$	652,943			$	524,419			$	1,177,362
				Ceded premiums written			-248,249				-20,198				-268,447
				Net premiums written			404,694				504,221				908,915
				Net premiums earned			151,152				268,965				420,117
				Other underwriting income			-				749				749
							151,152				269,714				420,866

			Expenses
				Net losses and loss expenses			99,464				119,506				218,970
				Acquisition expenses			14,616				57,020				71,636
				General and administrative expenses			35,627				30,851				66,478
							149,707				207,377				357,084
			Underwriting income			$	1,445			$	62,337			$	63,782

			Net loss ratio				65.7	%			44.4	%			52.1	%
		Acquisition expense ratio				9.7	%			21.2	%			17.1	%
		General and administrative expense ratio				23.6	%			11.5	%			15.8	%
		Combined ratio				99	%			77.1	%			85	%

		Reserve for losses and loss expenses			$	2,120,865			$	1,905,671			$	4,026,536
The following table reconciles total segment results to income before income taxes for the three months ended March 31, 2014 and 2013:
			Three Months Ended
			March 31,
				2014			2013

		Total underwriting income	$	72,769		$	63,782
		Net investment income		40,990			49,305
		Net foreign exchange losses		-2,964			-2,927
		Net realized and unrealized investment gains		4,872			6,235
		Net impairment losses recognized in earnings		-111			-806
		Amortization of intangibles		-1,617			-2,101
		Interest expense		-9,051			-9,038
		Income before income taxes	$	104,888		$	104,450
The following table provides gross and net premiums written by line of business for the three months ended March 31, 2014 and 2013:
				Gross			Net			Gross			Net
				premiums			premiums			premiums			premiums
				written			written			written			written
	Business Segment			2014			2014			2013			2013
	Insurance
		Agriculture	$	527,894		$	281,645		$	564,474		$	341,130
		Casualty and other specialty		74,895			41,721			56,467			43,261
		Professional lines		38,780			14,570			20,964			14,203
		Property		10,707			5,091			11,038			6,100
	Total Insurance			652,276			343,027			652,943			404,694

	Reinsurance
		Catastrophe		126,648			78,963			147,866			131,398
		Property		166,413			166,322			148,411			148,411
		Casualty		84,982			83,392			129,392			127,963
		Professional lines		25,619			25,619			12,307			12,307
		Specialty		101,577			101,382			86,443			84,142
	Total Reinsurance			505,239			455,678			524,419			504,221

	Total		$	1,157,515		$	798,705		$	1,177,362		$	908,915

Commitments_And_Contingencies

Commitments And Contingencies	3 Months Ended
Commitments And Contingencies	Mar. 31, 2014
Commitments And Contingencies	'
Commitments And Contingencies	'
	10. Commitments and contingencies

	Concentrations of credit risk. The Company's reinsurance recoverables on paid and unpaid losses at March 31, 2014 and December 31, 2013 amounted to $594.1 million and $758.0 million, respectively. At March 31, 2014, 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, 2014 and December 31, 2013, the Company held collateral of $112.2 million and $14.2 million, respectively, related to its ceded reinsurance agreements.

	Major production sources. The following table shows the percentage of net premiums written generated through the Company's largest brokers for the three months ended March 31, 2014 and 2013, respectively:
		Broker	2014		2013

		Marsh & McLennan Companies, Inc.	16.7	%	13.3	%
		Aon Benfield	15.1	%	17.7	%
		Willis Companies	12	%	8.2	%
		Total of largest brokers	43.8	%	39.2	%
	Letters of credit. As of March 31, 2014, the Company had issued letters of credit of $230.0 million (December 31, 2013 – $260.3 million) under its credit facility in favor of certain ceding companies to collateralize obligations.

	10. Commitments and contingencies, cont'd.

	On January 17, 2014, the Company and certain designated subsidiaries of the Company entered into a $50.0 million revolving letter of credit reimbursement agreement (“LOC Agreement”) and cash collateral agreement with Australia and New Zealand Banking Group Limited. As of March 31, 2014, the Company had issued letters of credit of $1.4 million under the LOC Agreement.

	For letters of credit issued under the LOC Agreement, the Company is required to pay a fee which is negotiated at the time of issuance of the letter of credit. Letters of credit issued under the LOC Agreement are required to be collateralized with cash or investments.

	Investment commitments. As of March 31, 2014 and December 31, 2013, the Company had pledged cash and cash equivalents and fixed maturity investments of $149.4 million and $146.1 million, respectively, in favor of certain ceding companies to collateralize obligations. As of March 31, 2014 and December 31, 2013, the Company had also pledged $273.0 million and $302.7 million of its cash and fixed maturity investments as required to meet collateral obligations for $230.0 million and $260.3 million in letters of credit outstanding under its credit facility and LOC Agreement, respectively. In addition, as of March 31, 2014 and December 31, 2013, cash and fixed maturity investments with fair values of $273.9 million and $273.7 million were on deposit with U.S. state regulators, respectively.

	The Company is subject to certain commitments with respect to other investments at March 31, 2014 and December 31, 2013. See Note 3.

	Reinsurance commitments. In the ordinary course of business, the Company periodically enters into reinsurance agreements that include terms which 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, 2014 are as follows:
		Twelve months ended March 31,	Amount

		2015	$	16,062
		2016		15,012
		2017		11,939
		2018		11,796
		2019		10,628
		2020 and thereafter		41,998
			$	107,435
	Total net lease expense under operating leases for the three months ended March 31, 2014 was $4.2 million (2013 – $3.6 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.

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Policy)	3 Months Ended
Summary Of Significant Accounting Policies (Policy)	Mar. 31, 2014
Summary Of Significant Accounting Policies	'
New Accounting Pronouncements Adopted	'
New Accounting Pronouncements Adopted	In July 2013, the FASB issued ASU 2013-11 “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”). ASU 2013-11 provides guidance on the presentation of unrecognized tax benefits to better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. ASU 2013-11 was effective for annual and interim reporting periods beginning after December 15, 2013, with both early adoption and retrospective application permitted. The Company adopted this standard effective January 1, 2014. This standard did not have a material impact on the Company's consolidated financial statements.

Investments_Policy

Investments (Policy)	3 Months Ended
Investments (Policy)	Mar. 31, 2014
Investments	'
Other Investments	'
	3. Investments, cont'd.

	In addition to the Company's fixed maturity, short-term and equity investments, the Company invests in (i) hedge funds and private investment funds that generally invest in senior secured bank debt, high yield credit, distressed debt, distressed real estate, derivatives, and equity long/short strategies (“alternative funds”) and (ii) high yield loan and convertible debt funds (“specialty funds”). The Company's alternative funds and specialty funds are recorded on the Company's balance sheet as “other investments.”
Variable Interest Entities	'
	Variable Interest Entities

	Entities that do not have sufficient equity at risk to allow the entity to finance its activities without additional financial support or in which the equity investors, as a group, do not have the characteristics of a controlling financial interest are referred to as variable interest entities (“VIE”). A VIE is consolidated by the variable interest holder that is determined to have the controlling financial interest (primary beneficiary) as a result of having both the power to direct the activities of a VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE. 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 is involved in the normal course of business with VIEs primarily 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 determined that it was not the primary beneficiary for any of these investments as of March 31, 2014. 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.
Gain Loss On Investments	'
Gain Loss On Investments	Realized and unrealized investment gains and losses are recognized in earnings using the first in, first out method.

Fair_Value_Measurement_Policy

Fair Value Measurement (Policy)	3 Months Ended
Fair Value Measurement (Policy)	Mar. 31, 2014
Fair Value Measurement	'
Fair Value Of Financial Instruments	'
	The Company determines the fair value of the fixed maturity investments, short-term investments, equity securities, other investments, 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.



	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.



	Structured securities including agency and non-agency, residential and commercial, mortgage and asset-backed securities – 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 investments – Other investments are comprised of alternative funds and specialty funds and are generally priced on net asset values (“NAV”) received from the fund managers or administrators. Due to the timing of the delivery of the final NAV by certain of the fund managers, valuations of certain alternative funds and specialty funds are estimated based on the most recently available information, including period end NAVs, period end estimates, or, in some cases, prior month or prior quarter NAVs. As this valuation technique incorporates both observable and significant unobservable inputs, the Company generally classifies the fair value of its other investments in Level 3.



	Debt – Outstanding debt consists of the Company's 6.15% Senior Notes due October 15, 2015 and the 7.0% Senior Notes due July 15, 2034 (the “Senior Notes”). The fair values of these securities were obtained from a third party pricing service and pricing was 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 are classified in Level 2.


	The carrying values of cash and cash equivalents, accrued investment income, net receivable on sales of investments, net payable on purchases of investments and other financial instruments not described above approximated their fair values at March 31, 2014.

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
Earnings Per Share (Policy)	Mar. 31, 2014
Earnings Per Share	'
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 that receive cash dividends, according to dividends declared and participation rights in undistributed earnings. Net income available to 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.
	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
Derivatives (Policy)	Mar. 31, 2014
Derivatives	'
Accounting policy for derivativess	'
	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 trading 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'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 investment gains, net foreign exchange losses and other underwriting (loss) income in the Condensed Consolidated Statements of Income and Comprehensive Income.

	The Company's derivatives are not designated as hedges under current accounting guidance. The Company invests a portion of its fixed maturity assets with a third party investment manager 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 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.

	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.

	Commodity Futures and Options – to economically hedge certain underwriting risks.

	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 of third parties. 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.

Offsetting of derivatives policy	'
Offsetting of derivatives policy	none of the Company's derivative instruments were recorded on a net basis in the Condensed Consolidated Balance Sheets.

Segment_Reporting_Policy

Segment Reporting (Policy)	3 Months Ended
Segment Reporting (Policy)	Mar. 31, 2014
Segment Reporting	'
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
	Reinsurance segment lines of business
	• Catastrophe
	• Property
	• Casualty
	• Professional lines
	• Specialty
	Management measures 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 directly incurred by the segments are allocated primarily based on estimated consumption, headcount and other variables deemed relevant to the allocation of such expenses. Ceded reinsurance and recoveries are recorded within the business segment to which they apply.

Investments_Tables

Investments (Tables)	3 Months Ended
Investments (Tables)	Mar. 31, 2014
Investments	'
Composition Of Net Investment Income	'
											2014			2013
			Available for sale investments							$	30,327		$	29,481
			Other investments								13,542			23,059
			Cash and cash equivalents								786			451
										$	44,655		$	52,991
			Investment expenses								-3,665			-3,686
			Net investment income							$	40,990		$	49,305
Composition of the Investment Portfolio by Investment Type	'
					31-Mar-14						31-Dec-13
			Type of Investment		Fair Value		Percentage				Fair Value		Percentage
			Fixed maturity investments	$	4,794,445		73.8	%		$	4,823,964		74.2	%
			Cash and cash equivalents⁽¹⁾		760,797		11.7	%			771,714		11.9	%
			Other investments⁽²⁾		621,914		9.6	%			617,478		9.5	%
			Short-term investments		46,167		0.7	%			35,028		0.5	%
			Equity securities		271,530		4.2	%			252,466		3.9	%
			Total	$	6,494,853		100	%		$	6,500,650		100	%

			(1) Includes net receivable on sales of investments and net payable on purchases of investments.
			(2) Consists of investments in alternative funds and specialty funds.
Composition Of Fixed Income Portfolio, Including Fixed Maturity Investments And Short-Term Investments, By Investment Ratings	'
					31-Mar-14						31-Dec-13
			Ratings⁽¹⁾		Fair Value		Percentage				Fair Value		Percentage
			U.S. government and agencies securities	$	627,748		13	%		$	769,343		15.8	%
			AAA / Aaa		996,691		20.6	%			972,820		20	%
			AA / Aa		1,789,744		36.9	%			1,771,156		36.5	%
			A / A		935,778		19.3	%			895,549		18.4	%
			BBB		385,759		8	%			363,722		7.5	%
			Below BBB		81,104		1.7	%			66,791		1.4	%
			Not rated		23,788		0.5	%			19,611		0.4	%
			Total	$	4,840,612		100	%		$	4,858,992		100	%

			(1) The credit rating for each security reflected above was determined based on the rating assigned to the individual security by Standard & Poor's Financial Services LLC ("Standard & Poor's"). If a rating is not supplied by Standard & Poor's, the equivalent rating supplied by either Moody's Investors Service, Inc. ("Moody's") or Fitch Ratings, Inc. is used.
Contractual Maturities Of Fixed Maturity And Short-Term Investments	'
				31-Mar-14						31-Dec-13
					Amortized						Amortized
					Cost			Fair Value			Cost			Fair Value
		Due within one year		$	177,361		$	178,464		$	144,814		$	145,653
		Due after one year through five years			1,665,241			1,674,208			1,808,001			1,815,240
		Due after five years through ten years			311,055			313,796			290,391			288,486
		Due after ten years			43,429			45,209			26,344			26,937
		Residential mortgage-backed securities			1,176,805			1,183,421			1,202,145			1,197,221
		Commercial mortgage-backed securities			950,405			971,959			936,358			952,887
		Asset-backed securities			470,662			473,555			429,556			432,568
		Total		$	4,794,958		$	4,840,612		$	4,837,609		$	4,858,992
Other Investments	'
		31-Mar-14			Market Value			Unfunded Commitments			Ineligible for Redemption over next 12 months
		Alternative funds
			Hedge funds	$	399,911		$	-		$	49,324
			Private investment funds		63,108			69,410			63,108
		Total alternative funds			463,019			69,410			112,432

		Specialty funds
			High yield loan funds		112,343			-			-
			Convertible debt funds		46,552			-			-
		Total specialty funds			158,895			-			-
		Total other investments		$	621,914		$	69,410		$	112,432
		31-Dec-13			Market Value			Unfunded Commitments			Ineligible for Redemption in 2014
		Alternative funds
			Hedge funds	$	401,438		$	-		$	47,406
			Private investment funds		59,703			57,997			59,703
		Total alternative funds			461,141			57,997			107,109

		Specialty funds
			High yield loan funds		111,254			-			-
			Convertible debt funds		45,083			-			-
		Total specialty funds			156,337			-			-
		Total other investments		$	617,478		$	57,997		$	107,109
Net Realized And Unrealized Investment Gains	'
				2014			2013
		Gross realized gains on investment sales	$	10,247		$	7,420
		Gross realized losses on investment sales		-5,984			-1,463
		Change in fair value of derivative financial instruments⁽¹⁾		609			278
		Net realized and unrealized investment gains	$	4,872		$	6,235
		(1) For additional information on the Company's derivative financial instruments, see Note 7.
Amortized Cost, Fair Value, Unrealized Gains and Losses And Non-Credit Other-Then-Temporary Impairments	'
							Gross			Gross
				Amortized			Unrealized			Unrealized						Non-Credit
		31-Mar-14		Cost			Gains			Losses			Fair Value			OTTI ⁽²⁾
		Fixed maturity investments
			U.S. government and agencies securities	$	626,491		$	6,126		$	-4,869		$	627,748		$	-
			U.S. state and municipal securities		28,217			118			-203			28,132			-
			Foreign government securities		204,003			1,396			-974			204,425			-
			Government guaranteed corporate securities		49,409			242			-25			49,626			-
			Corporate securities		1,242,806			16,533			-3,760			1,255,579			-
			Residential mortgage-backed securities		1,176,805			18,916			-12,300			1,183,421			-4,161
			Commercial mortgage-backed securities⁽¹⁾		950,405			26,246			-4,692			971,959			-47
			Asset-backed securities		470,662			3,551			-658			473,555			-160
		Total fixed maturity investments		$	4,748,798		$	73,128		$	-27,481		$	4,794,445		$	-4,368
		Short-term investments			46,160			16			-9			46,167			-
		Total fixed income investments		$	4,794,958		$	73,144		$	-27,490		$	4,840,612		$	-4,368

		Equity securities
			Equity investments	$	171,629		$	25,156		$	-2,202		$	194,583		$	-
			Emerging market debt funds		60,250			1,540			-			61,790			-
			Preferred equity investments		7,829			2,016			-17			9,828			-
			Short-term fixed income fund		5,328			1			-			5,329			-
		Total equity securities		$	245,036		$	28,713		$	-2,219		$	271,530		$	-

	-1	Balances include amounts related to collateralized debt obligations held with total fair values of $17.1 million.
	-2	Represents total OTTI recognized in accumulated other comprehensive income. It does not include the change in fair value subsequent to the impairment measurement date. At March 31, 2014, the gross unrealized loss related to fixed income investments for which a non-credit OTTI was recognized in accumulated other comprehensive income was nil.
								Gross			Gross
					Amortized			Unrealized			Unrealized						Non-Credit
			31-Dec-13		Cost			Gains			Losses			Fair Value			OTTI ⁽²⁾
			Fixed maturity investments
				U.S. government and agencies securities	$	771,227		$	5,735		$	-7,619		$	769,343		$	-
				U.S. state and municipal securities		27,138			111			-395			26,854			-
				Foreign government securities		183,650			1,003			-2,006			182,647			-
				Government guaranteed corporate securities		34,921			274			-50			35,145			-
				Corporate securities		1,217,585			16,225			-6,511			1,227,299			-
				Residential mortgage-backed securities		1,202,145			17,005			-21,929			1,197,221			-4,257
				Commercial mortgage-backed securities⁽¹⁾		936,358			24,673			-8,144			952,887			-47
				Asset-backed securities		429,556			3,902			-890			432,568			-163
			Total fixed maturity investments		$	4,802,580		$	68,928		$	-47,544		$	4,823,964		$	-4,467
			Short-term investments			35,029			1			-2			35,028			-
			Total fixed income investments		$	4,837,609		$	68,929		$	-47,546		$	4,858,992		$	-4,467

			Equity securities
				Equity investments	$	152,525		$	24,139		$	-1,995		$	174,669		$	-
				Emerging market debt funds		60,250			594			-			60,844			-
				Preferred equity investments		6,325			1,977			-79			8,223			-
				Short-term fixed income funds		8,728			2			-			8,730			-
			Total equity securities		$	227,828		$	26,712		$	-2,074		$	252,466		$	-

	-1	Balances include amounts related to collateralized debt obligations held with total fair values of $18.7 million.
	-2	Represents total OTTI recognized in accumulated other comprehensive income. It does not include the change in fair value subsequent to the impairment measurement date. At December 31, 2013, the gross unrealized loss related to fixed income investments for which a non-credit OTTI was recognized in accumulated other comprehensive income was $0.1 million.
Available For Sale Securities In An Unrealized Loss Position	'
							Less than 12 months						12 months or greater						Total
							Unrealized			Fair			Unrealized			Fair			Unrealized		Fair
		31-Mar-14					Losses⁽¹⁾			Value			Losses⁽¹⁾			Value			Losses⁽¹⁾		Value
		Fixed maturity investments
			U.S. government and agencies
				securities		$	-4,601		$	224,226		$	-268		$	9,546		$	-4,869	$	233,772
			U.S. state and municipal
				securities			-203			14,959			-			-			-203		14,959
			Foreign government securities				-927			93,615			-47			4,391			-974		98,006
			Government guaranteed
				corporate securities			-25			29,341			-			-			-25		29,341
			Corporate securities				-3,485			359,495			-275			20,341			-3,760		379,836
			Residential mortgage-backed
				securities			-9,124			390,553			-3,176			82,688			-12,300		473,241
			Commercial mortgage-backed
				securities			-3,778			229,417			-914			31,011			-4,692		260,428
			Asset-backed securities				-508			140,501			-150			10,549			-658		151,050
		Total fixed maturity investments				$	-22,651		$	1,482,107		$	-4,830		$	158,526		$	-27,481	$	1,640,633
		Short-term investments					-9			36,403			-			-			-9		36,403
		Total fixed income investments				$	-22,660		$	1,518,510		$	-4,830		$	158,526		$	-27,490	$	1,677,036

		Equity securities
			Equity investments			$	-1,638		$	27,109		$	-564		$	8,565		$	-2,202	$	35,674
			Preferred equity investments				-17			1,053			-			-			-17		1,053
		Total equity securities				$	-1,655		$	28,162		$	-564		$	8,565		$	-2,219	$	36,727

	-1	Gross unrealized losses include unrealized losses on non-OTTI securities recognized in accumulated other comprehensive income at March 31, 2014.
	3	Investments, cont’d.
							Less than 12 months						12 months or greater						Total
							Unrealized			Fair			Unrealized			Fair			Unrealized		Fair
		31-Dec-13					Losses⁽¹⁾			Value			Losses⁽¹⁾			Value			Losses⁽¹⁾		Value
		Fixed maturity investments
			U.S. government and agencies
				securities		$	-7,359		$	382,593		$	-260		$	6,050		$	-7,619	$	388,643
			U.S. state and municipal
				securities			-395			20,452			-			-			-395		20,452
			Foreign government securities				-1,981			139,503			-25			5,261			-2,006		144,764
			Government guaranteed
				corporate securities			-50			13,326			-			-			-50		13,326
			Corporate securities				-5,959			478,287			-552			28,690			-6,511		506,977
			Residential mortgage-backed
				securities			-17,572			524,731			-4,357			102,446			-21,929		627,177
			Commercial mortgage-backed
				securities			-7,664			377,969			-480			19,183			-8,144		397,152
			Asset-backed securities				-738			174,455			-152			7,011			-890		181,466
		Total fixed maturity investments				$	-41,718		$	2,111,316		$	-5,826		$	168,641		$	-47,544	$	2,279,957
		Short-term investments					-2			2,468			-			-			-2		2,468
		Total fixed income investments				$	-41,720		$	2,113,784		$	-5,826		$	168,641		$	-47,546	$	2,282,425

		Equity securities
			Equity investments			$	-1,995		$	36,751		$	-		$	-		$	-1,995	$	36,751
			Preferred equity investments				-79			2,987			-			-			-79		2,987
		Total equity securities				$	-2,074		$	39,738		$	-		$	-		$	-2,074	$	39,738

	-1	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive income at December 31, 2013.
Analysis Of OTTI	'
				2014			2013
		Total other-than-temporary impairment losses	$	-111		$	-806
		Portion of loss recognized in other comprehensive income (loss)		-			-
		Net impairment losses recognized in earnings	$	-111		$	-806
Credit Losses Recognized For Available For Sale Investments In Earnings, OTTI Loss Was Recognized In Accumulated Other Comprehensive Income	'
					2014			2013
		Beginning balance			$	-1,553		$	-2,000
		Addition for the amount related to the credit loss for which an other-than-temporary
			impairment was not previously recognized			-			-
		Addition for the amount related to the credit loss for which an other-than-temporary
			impairment was previously recognized			-			-
		Reductions for increases in cash flows expected to be collected that are recognized
			over the remaining life of the security			-			-
		Reductions for securities sold during the period				33			117
		Ending balance			$	-1,520		$	-1,883

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	3 Months Ended
Fair Value Measurement (Tables)	Mar. 31, 2014
Fair Value Measurement	'
Schedule Of Available For Sale Investments, Other Investments, Derivative Instruments And Debt Measured On A Recurring Basis	'
					Fair Value Measurements at March 31, 2014
								Quoted
								Prices in
								Active
								Markets			Significant
								for			Other			Significant
					Total at			Identical			Observable			Unobservable
					March 31,			Assets			Inputs			Inputs
					2014			(Level 1)			(Level 2)			(Level 3)
		Assets
		Fixed maturity investments
			U.S. government and agencies securities	$	627,748		$	3,634		$	624,114		$	-
			U.S. state and municipal securities		28,132			-			28,132			-
			Foreign government securities		204,425			-			204,425			-
			Government guaranteed corporate securities		49,626			-			49,626			-
			Corporate securities		1,255,579			-			1,254,842			737
			Residential mortgage-backed securities		1,183,421			-			1,183,386			35
			Commercial mortgage-backed securities		971,959			-			966,775			5,184
			Asset-backed securities		473,555			-			470,526			3,029
		Total fixed maturity investments		$	4,794,445		$	3,634		$	4,781,826		$	8,985
		Equity securities
			Equity investments		194,583			136,292			58,291			-
			Emerging market debt funds		61,790			-			61,790			-
			Preferred equity investments		9,828			-			9,828			-
			Short-term fixed income fund		5,329			5,329			-			-
		Total equity securities		$	271,530		$	141,621		$	129,909		$	-
		Short-term investments			46,167			-			46,167			-
		Other investments			621,914			-			-			621,914
		Other assets (see Note 7)			74,974			-			66,442			8,532
		Total assets		$	5,809,030		$	145,255		$	5,024,344		$	639,431
		Liabilities
		Other liabilities (see Note 7)		$	32,209		$	-		$	18,761		$	13,448
		Debt			594,413			-			594,413			-
		Total liabilities		$	626,622		$	-		$	613,174		$	13,448
					Fair Value Measurements at December 31, 2013
								Quoted
								Prices in
								Active			Significant
								Markets for			Other			Significant
					Total at			Identical			Observable			Unobservable
					December 31,			Assets			Inputs			Inputs
					2013			(Level 1)			(Level 2)			(Level 3)
		Assets
		Fixed maturity investments
			U.S. government and agencies securities	$	769,343		$	20,248		$	749,095		$	-
			U.S. state and municipal securities		26,854			-			26,854			-
			Foreign government securities		182,647			-			182,647			-
			Government guaranteed corporate securities		35,145			-			35,145			-
			Corporate securities		1,227,299			-			1,226,553			746
			Residential mortgage-backed securities		1,197,221			-			1,196,973			248
			Commercial mortgage-backed securities		952,887			-			949,547			3,340
			Asset-backed securities		432,568			-			429,574			2,994
		Total fixed maturity investments		$	4,823,964		$	20,248		$	4,796,388		$	7,328
		Equity securities
			Equity investments		174,669			117,776			56,893			-
			Emerging market debt funds		60,844			-			60,844			-
			Preferred equity investments		8,223			-			8,223			-
			Short-term fixed income fund		8,730			8,730			-			-
		Total equity securities		$	252,466		$	126,506		$	125,960		$	-
		Short-term investments			35,028			-			35,028			-
		Other investments			617,478			-			-			617,478
		Other assets (see Note 7)			108,272			-			94,234			14,038
		Total assets		$	5,837,208		$	146,754		$	5,051,610		$	638,844
	Liabilities
	Other liabilities (see Note 7)			49,452			-			29,883			19,569
	Debt			575,115			-			575,115			-
	Total liabilities		$	624,567		$	-		$	604,998		$	19,569
Reconciliation Of The Beginning And Ending Balances For All Available For Sale Investments, Other Investments And Derivative Instruments Measured At Fair Value On A Recurring Basis Using Level 3 Inputs	'
				Three Months Ended March 31, 2014
				Fixed maturity investments			Other investments			Other assets			Total assets		Other liabilities
		Level 3, beginning of period		$	7,328		$	617,478		$	14,038		$	638,844	$	-19,569
		Total equity income and realized gains included in earnings			17			19,186			-			19,203		-
		Total equity losses and losses included in earnings			-26			-5,645			-			-5,671		-
		Total income included in other underwriting (loss) income			-			-			3,975			3,975		7,426
		Total loss included in other underwriting (loss) income			-			-			-6,888			-6,888		-4,776
		Change in unrealized gains included in other comprehensive income (loss)			111			-			-			111		-
		Change in unrealized losses included in other comprehensive income (loss)			-115			-			-			-115		-
		Purchases			-			4,674			-			4,674		-
		Issues			-			-			640			640		-1,280
		Sales			-184			-13,779			-			-13,963		-
		Settlements			-			-			-3,233			-3,233		4,751
		Transfers in to Level 3			2,117			-			-			2,117		-
		Transfers out of Level 3			-263			-			-			-263		-
		Level 3, end of period		$	8,985		$	621,914		$	8,532		$	639,431	$	-13,448
				Three Months Ended March 31, 2013
				Fixed maturity investments			Other investments			Other assets			Total assets		Other liabilities
		Level 3, beginning of period		$	8,497		$	517,546		$	882		$	526,925	$	-1,922
		Total equity income and realized gains included in earnings			5			25,483			-			25,488		-
		Total equity losses and losses included in earnings			-			-2,424			-			-2,424		-
		Total income included in other underwriting (loss) income			-			-			-			-		2,342
		Total loss included in other underwriting (loss) income			-			-			-1,176			-1,176		-
		Change in unrealized gains included in other comprehensive income (loss)			84			-			-			84		-
		Change in unrealized losses included in other comprehensive income (loss)			-54			-			-			-54		-
		Purchases			-			21,990			-			21,990		-
		Issues			-			-			300			300		-432
		Sales			-1,926			-7,880			-			-9,806		-
		Transfers in to Level 3			3,264			-			-			3,264		-
		Transfers out of Level 3			-56			-			-			-56		-
		Level 3, end of period		$	9,814		$	554,715		$	6		$	564,535	$	-12


Fair Value Inputs Assets And Liabilities Quantitative Information [Table Text Block]	'
				31-Mar-14
				Fair Value (Level 3)		Valuation Techniques		Unobservable Inputs		Low			High		Weighted Average or Actual

		Net weather and energy related derivative liability	$	4,916		Historical Analysis and Simulation		Correlation			0			1	Actual
								Weather curve			2,155			3,500	Actual
								Commodity curve		$	2.95		$	8	Actual

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
Earnings Per Share (Tables)	Mar. 31, 2014
Earnings Per Share	'
Schedule Of Computation Of Basic And Diluted Earnings Per Share	'
						2014			2013
		Numerator:
			Net income available to common and participating
				common shareholders	$	96,292		$	92,111
			Less amount allocated to participating common shareholders ⁽¹⁾			-2,769			-1,510
			Net income allocated to common shareholders		$	93,523		$	90,601
		Denominator:
			Weighted average shares – basic			43,160,156			42,431,020

			Share equivalents:
				Options		-			11,799
				Restricted share units		286			1,117
			Weighted average shares – diluted			43,160,442			42,443,936

		Basic earnings per common share			$	2.17		$	2.13
		Diluted earnings per common share			$	2.17		$	2.13

		(1) Represents earnings attributable to holders of unvested restricted shares issued under the Company’s equity compensation plans that are
		considered participating. In periods of loss, no losses are allocated to participating common shareholders (unvested restricted shares).
Schedule Of Dividends Declared	'
			Three Months Ended March 31,
			2014			2013
		Dividends declared per Series A preferred share	$	0.484375		$	0.484375
		Dividends declared per Series B preferred share	$	0.46875		$	0.46875
		Dividends declared per common share	$	0.34		$	0.32

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
Accumulated Other Comprehensive Income (Tables)	Mar. 31, 2014
Accumulated Other Comprehensive Income	'
Schedule Of Accumulated Other Comprehensive Income	'
			For the Three Months Ended March 31, 2014
			Loss on cash flow hedge			Unrealized gains on available-for-sale securities		Foreign currency items		Total
	Beginning balance		$	-1,855		$	45,950	$	18,636	$	62,731
		Other comprehensive income before reclassifications		-			27,665		3,225		30,890
		Amounts reclassified from accumulated other comprehensive income⁽¹⁾		23			-4,285		-		-4,262
	Net current period other comprehensive income			23			23,380		3,225		26,628
	Ending balance		$	-1,832		$	69,330	$	21,861	$	89,359

			For the Three Months Ended March 31, 2013
			Loss on cash flow hedge			Unrealized gains on available-for-sale securities		Foreign currency items		Total
	Beginning balance		$	-1,944		$	141,731	$	12,676	$	152,463
		Other comprehensive income (loss) before reclassifications		-			97		-10,194		-10,097
		Amounts reclassified from accumulated other comprehensive income⁽¹⁾		16			-4,943		-		-4,927
	Net current period other comprehensive income (loss)			16			-4,846		-10,194		-15,024
	Ending balance		$	-1,928		$	136,885	$	2,482	$	137,439

	(1) All amounts are net of tax.
Reclassification Out Of Accumulated Other Comprehensive Income	'
		Three Months Ended March 31, 2014
		Details about accumulated other comprehensive income components			Amount reclassified from accumulated other comprehensive income		Affected line item in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income
		Loss on cash flow hedge - Debt		$	23		Interest expense
					23		Total before income taxes
					-		Income tax expense
				$	23		Total net of income taxes

		Unrealized gains on available-for-sale securities		$	-4,263		Net realized and unrealized investment gains
					111		Net impairment losses recognized in earnings
					-4,152		Total before income taxes
					-133		Income tax expense
				$	-4,285		Total net of income taxes

		Three Months Ended March 31, 2013
		Details about accumulated other comprehensive income components			Amount reclassified from accumulated other comprehensive income		Affected line item in the Unaudited Condensed Consolidated Statements of Income and Comprehensive Income
		Loss on cash flow hedge - Debt		$	16		Interest expense
					16		Total before income taxes
					-		Income tax expense
				$	16		Total net of income taxes

		Unrealized gains on available-for-sale securities		$	-5,957		Net realized and unrealized investment gains
					806		Net impairment losses recognized in earnings
					-5,151		Total before income taxes
					208		Income tax expense
				$	-4,943		Total net of income taxes

Derivatives_Tables

Derivatives (Tables)	3 Months Ended
Derivatives (Tables)	Mar. 31, 2014
Derivatives	'
Schedule Of The Fair Value And Related Notional Amounts Of Derivatives Included In The Company's Consolidated Balance Sheet	'
				31-Mar-14						31-Dec-13
							Notional					Notional
				Fair			Principal			Fair		Principal
				Value			Amount			Value		Amount
		Derivatives recorded in other assets
			Foreign exchange forward contracts	$	175		$	15,427		$	251	$	19,269
			Interest rate swaps		40			20,200			124		16,100
			Interest rate swaptions		1			24,361			39		24,338
			Interest rate futures		30			103,955			-		-
			TBAs		66,196			66,000			93,820		93,840
			Energy and weather contracts		8,532			51,757			14,038		53,986
			Total recorded in other assets	$	74,974					$	108,272

		Derivatives recorded in other liabilities
			Foreign exchange forward contracts	$	215		$	15,722		$	172	$	15,861
			Interest rate swaps		911			12,614			933		12,193
			Interest rate swaptions		-			27,861			543		361,455
			Interest rate futures		-			-			17		103,935
			TBAs		17,635			18,000			28,218		28,000
			Energy and weather contracts		13,448			61,655			19,569		66,113
			Total recorded in other liabilities	$	32,209					$	49,452

			Net derivative asset	$	42,765					$	58,820
Schedule Of The Gains And Losses On The Consolidated Statements Of Income And Comprehensive Income From Derivatives	'
					2014			2013
		Total included in net foreign exchange losses from
			foreign exchange forward contracts		$	-227		$	161

		Interest rate futures			$	21		$	-
		Credit default swaps				-			3
		Interest rate swaps				-766			118
		Interest rate swaptions				429			175
		TBAs				925			-17
		Total included in net realized and unrealized investment gains			$	609		$	279

		Total included in other underwriting (loss) income from
			energy and weather contracts		$	-258		$	1,166

		Total gains from derivatives			$	124		$	1,606

Segment_Reporting_Tables

Segment Reporting (Tables)	3 Months Ended
Segment Reporting (Tables)	Mar. 31, 2014
Segment Reporting	'
Summary Of The Segment Revenues, Results And Reserve For Losses And Loss Expenses	'
					Three Months Ended March 31, 2014
						Insurance			Reinsurance				Total
			Revenues
				Gross premiums written		$	652,276		$	505,239			$	1,157,515
				Ceded premiums written			-309,249			-49,561				-358,810
				Net premiums written			343,027			455,678				798,705
				Net premiums earned			144,021			252,245				396,266
				Other underwriting loss			-			-1,238				-1,238
							144,021			251,007				395,028

			Expenses
				Net losses and loss expenses			88,533			88,363				176,896
				Acquisition expenses			12,261			59,896				72,157
				General and administrative expenses			41,288			31,918				73,206
							142,082			180,177				322,259
			Underwriting income			$	1,939		$	70,830			$	72,769

			Net loss ratio				61.5	%		35	%			44.6	%
			Acquisition expense ratio				8.5	%		23.7	%			18.2	%
			General and administrative expense ratio				28.7	%		12.7	%			18.5	%
			Combined ratio				98.7	%		71.4	%			81.3	%

			Reserve for losses and loss expenses			$	2,023,819		$	1,823,955			$	3,847,774
					Three Months Ended March 31, 2013
							Insurance			Reinsurance				Total
			Revenues
				Gross premiums written		$	652,943		$	524,419			$	1,177,362
				Ceded premiums written			-248,249			-20,198				-268,447
				Net premiums written			404,694			504,221				908,915
				Net premiums earned			151,152			268,965				420,117
				Other underwriting income			-			749				749
							151,152			269,714				420,866

			Expenses
				Net losses and loss expenses			99,464			119,506				218,970
				Acquisition expenses			14,616			57,020				71,636
				General and administrative expenses			35,627			30,851				66,478
							149,707			207,377				357,084
			Underwriting income			$	1,445		$	62,337			$	63,782

			Net loss ratio				65.7	%		44.4	%			52.1	%
			Acquisition expense ratio				9.7	%		21.2	%			17.1	%
			General and administrative expense ratio				23.6	%		11.5	%			15.8	%
			Combined ratio				99	%		77.1	%			85	%

			Reserve for losses and loss expenses			$	2,120,865		$	1,905,671			$	4,026,536
Schedule Of Segment Results To Income Before Income Taxes	'
				Three Months Ended
				March 31,
					2014			2013

			Total underwriting income	$	72,769		$	63,782
			Net investment income		40,990			49,305
			Net foreign exchange losses		-2,964			-2,927
			Net realized and unrealized investment gains		4,872			6,235
			Net impairment losses recognized in earnings		-111			-806
			Amortization of intangibles		-1,617			-2,101
			Interest expense		-9,051			-9,038
			Income before income taxes	$	104,888		$	104,450
Schedule Of Gross And Net Premiums By Line Of Business	'
					Gross			Net		Gross			Net
					premiums			premiums		premiums			premiums
					written			written		written			written
		Business Segment			2014			2014		2013			2013
		Insurance
			Agriculture	$	527,894		$	281,645	$	564,474		$	341,130
			Casualty and other specialty		74,895			41,721		56,467			43,261
			Professional lines		38,780			14,570		20,964			14,203
			Property		10,707			5,091		11,038			6,100
		Total Insurance			652,276			343,027		652,943			404,694

		Reinsurance
			Catastrophe		126,648			78,963		147,866			131,398
			Property		166,413			166,322		148,411			148,411
			Casualty		84,982			83,392		129,392			127,963
			Professional lines		25,619			25,619		12,307			12,307
			Specialty		101,577			101,382		86,443			84,142
		Total Reinsurance			505,239			455,678		524,419			504,221

		Total		$	1,157,515		$	798,705	$	1,177,362		$	908,915

Commitments_And_Contingencies_

Commitments And Contingencies (Tables)	3 Months Ended
Commitments And Contingencies (Tables)	Mar. 31, 2014
Commitments And Contingencies	'
Schedule Of Percentage Of Net Premiums	'
		Broker	2014		2013

		Marsh & McLennan Companies, Inc.	16.7	%	13.3	%
		Aon Benfield	15.1	%	17.7	%
		Willis Companies	12	%	8.2	%
		Total of largest brokers	43.8	%	39.2	%
Schedule Of Future Minimum Lease Commitments	'
		Twelve months ended March 31,	Amount

		2015	$	16,062
		2016		15,012
		2017		11,939
		2018		11,796
		2019		10,628
		2020 and thereafter		41,998
			$	107,435

Investments_Narrative_Details

Investments (Narrative) (Details) (USD $)	3 Months Ended
Investments (Narrative) (Details) (USD $)	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Investments	'		'	'
Other investments, invested amount	$433,400,000		'	$440,900,000
Other investments, market value	621,914,000		'	617,478,000
Number of available for sale securities in an unrealized loss position	707		'	880
Number of securities in a continuous unrealized loss position for twelve months or greater	88		'	71
OTTI losses recognized	111,000		806,000	'
Unrealized Losses	-29,709,000	[1]	'	-49,620,000	[2]
Unrealized Losses, 12 months or greater	($5,394,000)	[1]	'	($5,826,000)	[2]

[1]	Gross unrealized losses include unrealized losses on non-OTTI securities recognized in accumulated other comprehensive income at March 31, 2014.
[2]	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive income at December 31, 2013.

Investments_Composition_Of_Net

Investments (Composition Of Net Investment Income) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Investments	'	'
Available for sale investments	$30,327	$29,481
Other investments	13,542	23,059
Cash and cash equivalents	786	451
Investment income	44,655	52,991
Investment expenses	-3,665	-3,686
Net investment income	$40,990	$49,305

Investments_Summary_Of_Investm

Investments (Summary Of Investment Portfolio By Type) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Summary of Investment Holdings [Line Items]	'		'
Fair Value	$6,494,853		$6,500,650
Percentage of Investment	100.00%		100.00%
Fixed Maturity Securities [Member]	'		'
Summary of Investment Holdings [Line Items]	'		'
Fair Value	4,794,445		4,823,964
Percentage of Investment	73.80%		74.20%
Cash and Cash Equivalents [Member]	'		'
Summary of Investment Holdings [Line Items]	'		'
Fair Value	760,797	[1]	771,714	[1]
Percentage of Investment	11.70%	[1]	11.90%	[1]
Other Investments [Member]	'		'
Summary of Investment Holdings [Line Items]	'		'
Fair Value	621,914	[2]	617,478	[2]
Percentage of Investment	9.60%	[2]	9.50%	[2]
Short Term Investments [Member]	'		'
Summary of Investment Holdings [Line Items]	'		'
Fair Value	46,167		35,028
Percentage of Investment	0.70%		0.50%
Equity Securities [Member]	'		'
Summary of Investment Holdings [Line Items]	'		'
Fair Value	$271,530		$252,466
Percentage of Investment	4.20%		3.90%

[1]	Includes net receivable on sales of investments and net payable on purchases of investments.
[2]	Consists of investments in alternative funds and specialty funds.

Investments_Composition_Of_The

Investments (Composition Of The Fixed Income Portfolio By Investment Ratings Assigned By Rating Agencies) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
AAA/Aaa [Member]	'		'
Investments By Rating [Line Items]	'		'
Fair Value of fixed income portfolio by investment ratings	$996,691	[1]	$972,820	[1]
Percentage of fixed income portfolio by investment ratings	20.60%	[1]	20.00%	[1]
AA/Aa [Member]	'		'
Investments By Rating [Line Items]	'		'
Fair Value of fixed income portfolio by investment ratings	1,789,744	[1]	1,771,156	[1]
Percentage of fixed income portfolio by investment ratings	36.90%	[1]	36.50%	[1]
A/A [Member]	'		'
Investments By Rating [Line Items]	'		'
Fair Value of fixed income portfolio by investment ratings	935,778	[1]	895,549	[1]
Percentage of fixed income portfolio by investment ratings	19.30%	[1]	18.40%	[1]
BBB [Member]	'		'
Investments By Rating [Line Items]	'		'
Fair Value of fixed income portfolio by investment ratings	385,759	[1]	363,722	[1]
Percentage of fixed income portfolio by investment ratings	8.00%	[1]	7.50%	[1]
Below BBB [Member]	'		'
Investments By Rating [Line Items]	'		'
Fair Value of fixed income portfolio by investment ratings	81,104	[1]	66,791	[1]
Percentage of fixed income portfolio by investment ratings	1.70%	[1]	1.40%	[1]
Not Rated [Member]	'		'
Investments By Rating [Line Items]	'		'
Fair Value of fixed income portfolio by investment ratings	23,788	[1]	19,611	[1]
Percentage of fixed income portfolio by investment ratings	0.50%	[1]	0.40%	[1]
U.S. Government And Agencies Securities [Member]	'		'
Investments By Rating [Line Items]	'		'
Fair Value of fixed income portfolio by investment ratings	627,748	[1]	769,343	[1]
Percentage of fixed income portfolio by investment ratings	13.00%	[1]	15.80%	[1]
Fixed Income Investments [Member]	'		'
Investments By Rating [Line Items]	'		'
Fair Value of fixed income portfolio by investment ratings	$4,840,612	[1]	$4,858,992	[1]
Percentage of fixed income portfolio by investment ratings	100.00%	[1]	100.00%	[1]

[1]	The credit rating for each security reflected above was determined based on the rating assigned to the individual security by Standard & Poor's Financial Services LLC ("Standard & Poor's"). If a rating is not supplied by Standard & Poor's, the equivalent rating supplied by either Moody's Investors Service, Inc. ("Moody's") or Fitch Ratings is used.

Investments_Contractual_Maturi

Investments (Contractual Maturities Of Fixed Income Securities) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'		'
Due within one year, Amortized Cost	$177,361		$144,814
Due within one year, Fair Value	178,464		145,653
Due after one year through five years, Amortized Cost	1,665,241		1,808,001
Due after one year through five years, Fair Value	1,674,208		1,815,240
Due after five years through ten years, Amortized Cost	311,055		290,391
Due after five years through ten years, Fair Value	313,796		288,486
Due after ten years, Amortized Cost	43,429		26,344
Due after ten years, Fair Value	45,209		26,937
Amortized Cost	4,748,798		4,802,580
Debt securities, fair value	4,794,445		4,823,964
Residential Mortgage-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
No single maturity date, amortized cost	1,176,805		1,202,145
No single maturity date, fair value	1,183,421		1,197,221
Amortized Cost	1,176,805		1,202,145
Debt securities, fair value	1,183,421		1,197,221
Commercial Mortgage-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
No single maturity date, amortized cost	950,405		936,358
No single maturity date, fair value	971,959		952,887
Amortized Cost	950,405	[1]	936,358	[2]
Debt securities, fair value	971,959	[1]	952,887	[2]
Asset-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
No single maturity date, amortized cost	470,662		429,556
No single maturity date, fair value	473,555		432,568
Amortized Cost	470,662		429,556
Debt securities, fair value	473,555		432,568
Fixed Income Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	4,794,958		4,837,609
Debt securities, fair value	$4,840,612		$4,858,992

[1]	Balances include amounts related to collateralized debt obligations held with total fair values of $17.1 million.
[2]	Balances include amounts related to collateralized debt obligations held with total fair values of $18.7 million.

Investments_Other_Investments_

Investments (Other Investments) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule Of Equity Method Investments [Line Items]	'	'
Other investments, market value	$621,914	$617,478
Commitments under investment fund classified within other investments	69,410	57,997
Prohibited amount under redemption requests over the next 12 months	112,432	107,109
Alternative Funds [Member]	'	'
Schedule Of Equity Method Investments [Line Items]	'	'
Other investments, market value	463,019	461,141
Commitments under investment fund classified within other investments	69,410	57,997
Prohibited amount under redemption requests over the next 12 months	112,432	107,109
Hedge Funds [Member]	'	'
Schedule Of Equity Method Investments [Line Items]	'	'
Other investments, market value	399,911	401,438
Commitments under investment fund classified within other investments	0	0
Prohibited amount under redemption requests over the next 12 months	49,324	47,406
Private Equity Funds [Member]	'	'
Schedule Of Equity Method Investments [Line Items]	'	'
Other investments, market value	63,108	59,703
Commitments under investment fund classified within other investments	69,410	57,997
Prohibited amount under redemption requests over the next 12 months	63,108	59,703
Specialty Funds [Member]	'	'
Schedule Of Equity Method Investments [Line Items]	'	'
Other investments, market value	158,895	156,337
Commitments under investment fund classified within other investments	0	0
Prohibited amount under redemption requests over the next 12 months	0	0
High Yield Loan Funds [Member]	'	'
Schedule Of Equity Method Investments [Line Items]	'	'
Other investments, market value	112,343	111,254
Commitments under investment fund classified within other investments	0	0
Prohibited amount under redemption requests over the next 12 months	0	0
Convertible Debt Funds [Member]	'	'
Schedule Of Equity Method Investments [Line Items]	'	'
Other investments, market value	46,552	45,083
Commitments under investment fund classified within other investments	0	0
Prohibited amount under redemption requests over the next 12 months	$0	$0

Investments_Other_Investments_1

Investments (Other Investments Narrative) (Details)	3 Months Ended
Investments (Other Investments Narrative) (Details)	Mar. 31, 2014
Hedge Funds [Member]	'
Schedule Of Equity Method Investments [Line Items]	'
Estimated remaining liquidation period in years	'3 years 0 months 0 days
Estimated liquidation, percentage in next 12 months	87.70%
Hedge Funds [Member] \| Maximum [Member]	'
Schedule Of Equity Method Investments [Line Items]	'
Estimated notice period, in days	'90
Hedge Funds [Member] \| Minimum [Member]	'
Schedule Of Equity Method Investments [Line Items]	'
Estimated notice period, in days	'30
Private Equity Funds [Member] \| Maximum [Member]	'
Schedule Of Equity Method Investments [Line Items]	'
Estimated remaining liquidation period in years	'10 years 0 months 0 days
Private Equity Funds [Member] \| Minimum [Member]	'
Schedule Of Equity Method Investments [Line Items]	'
Estimated remaining liquidation period in years	'5 years 0 months 0 days
High Yield Loan Funds [Member] \| Maximum [Member]	'
Schedule Of Equity Method Investments [Line Items]	'
Estimated notice period, in days	'90
High Yield Loan Funds [Member] \| Minimum [Member]	'
Schedule Of Equity Method Investments [Line Items]	'
Estimated notice period, in days	'30
Convertible Debt Funds [Member]	'
Schedule Of Equity Method Investments [Line Items]	'
Estimated notice period, in days	'5

Investments_Net_Realized_and_U

Investments (Net Realized and Unrealized Investment Gains) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Investments	'		'
Gross realized gains on investment sales	$10,247		$7,420
Gross realized losses on investment sales	-5,984		-1,463
Change in fair value of derivatives financial instruments	609	[1]	278	[1]
Net realized and unrealized investment gains	$4,872		$6,235

[1]	For additional information on the Company's derivative financial instruments, see Note 7

Investments_Amortized_Cost_Fai

Investments (Amortized Cost, Fair Value, Unrealized Gains And Losses And Non-Credit Other-Than-Temporary Impairments) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	$4,748,798,000		$4,802,580,000
Debt securities, fair value	4,794,445,000		4,823,964,000
Equity securities, cost	245,036,000		227,828,000
Equity securities, fair value	271,530,000		252,466,000
Gross unrealized loss related to securities, non-credit OTTI	0		100,000
U.S. Government And Agencies Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	626,491,000		771,227,000
Debt securities, gross unrealized gains	6,126,000		5,735,000
Debt securities, gross unrealized losses	-4,869,000		-7,619,000
Debt securities, fair value	627,748,000		769,343,000
Non-Credit OTTI	0	[1]	0	[2]
U.S. State And Municipal Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	28,217,000		27,138,000
Debt securities, gross unrealized gains	118,000		111,000
Debt securities, gross unrealized losses	-203,000		-395,000
Debt securities, fair value	28,132,000		26,854,000
Non-Credit OTTI	0	[1]	0	[2]
Foreign Government Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	204,003,000		183,650,000
Debt securities, gross unrealized gains	1,396,000		1,003,000
Debt securities, gross unrealized losses	-974,000		-2,006,000
Debt securities, fair value	204,425,000		182,647,000
Non-Credit OTTI	0	[1]	0	[2]
Government Guaranteed Corporate Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	49,409,000		34,921,000
Debt securities, gross unrealized gains	242,000		274,000
Debt securities, gross unrealized losses	-25,000		-50,000
Debt securities, fair value	49,626,000		35,145,000
Non-Credit OTTI	0	[1]	0	[2]
Corporate Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	1,242,806,000		1,217,585,000
Debt securities, gross unrealized gains	16,533,000		16,225,000
Debt securities, gross unrealized losses	-3,760,000		-6,511,000
Debt securities, fair value	1,255,579,000		1,227,299,000
Non-Credit OTTI	0	[1]	0	[2]
Residential Mortgage-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	1,176,805,000		1,202,145,000
Debt securities, gross unrealized gains	18,916,000		17,005,000
Debt securities, gross unrealized losses	-12,300,000		-21,929,000
Debt securities, fair value	1,183,421,000		1,197,221,000
Non-Credit OTTI	-4,161,000	[1]	-4,257,000	[2]
Commercial Mortgage-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	950,405,000	[3]	936,358,000	[4]
Debt securities, gross unrealized gains	26,246,000	[3]	24,673,000	[4]
Debt securities, gross unrealized losses	-4,692,000	[3]	-8,144,000	[4]
Debt securities, fair value	971,959,000	[3]	952,887,000	[4]
Non-Credit OTTI	-47,000	[1],[3]	-47,000	[2],[4]
Asset-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	470,662,000		429,556,000
Debt securities, gross unrealized gains	3,551,000		3,902,000
Debt securities, gross unrealized losses	-658,000		-890,000
Debt securities, fair value	473,555,000		432,568,000
Non-Credit OTTI	-160,000	[1]	-163,000	[2]
Fixed Maturity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	4,748,798,000		4,802,580,000
Debt securities, gross unrealized gains	73,128,000		68,928,000
Debt securities, gross unrealized losses	-27,481,000		-47,544,000
Debt securities, fair value	4,794,445,000		4,823,964,000
Non-Credit OTTI	-4,368,000	[1]	-4,467,000	[2]
Short Term Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	46,160,000		35,029,000
Debt securities, gross unrealized gains	16,000		1,000
Debt securities, gross unrealized losses	-9,000		-2,000
Debt securities, fair value	46,167,000		35,028,000
Non-Credit OTTI	0	[1]	0	[2]
Fixed Income Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, amortized cost	4,794,958,000		4,837,609,000
Debt securities, gross unrealized gains	73,144,000		68,929,000
Debt securities, gross unrealized losses	-27,490,000		-47,546,000
Debt securities, fair value	4,840,612,000		4,858,992,000
Non-Credit OTTI	-4,368,000	[1]	-4,467,000	[2]
Equity Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Equity securities, cost	171,629,000		152,525,000
Equity securities, gross unrealized gains	25,156,000		24,139,000
Equity securities, gross unrealized losses	-2,202,000		-1,995,000
Equity securities, fair value	194,583,000		174,669,000
Non-Credit OTTI	0	[1]	0	[2]
Emerging Market Debt Funds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Equity securities, cost	60,250,000		60,250,000
Equity securities, gross unrealized gains	1,540,000		594,000
Equity securities, gross unrealized losses	0		0
Equity securities, fair value	61,790,000		60,844,000
Non-Credit OTTI	0	[1]	0	[2]
Preferred Equity Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Equity securities, cost	7,829,000		6,325,000
Equity securities, gross unrealized gains	2,016,000		1,977,000
Equity securities, gross unrealized losses	-17,000		-79,000
Equity securities, fair value	9,828,000		8,223,000
Non-Credit OTTI	0	[1]	0	[2]
Short-term Fixed Income Fund [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Equity securities, cost	5,328,000		8,728,000
Equity securities, gross unrealized gains	1,000		2,000
Equity securities, gross unrealized losses	0		0
Equity securities, fair value	5,329,000		8,730,000
Non-Credit OTTI	0	[1]	0	[2]
Total Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Equity securities, cost	245,036,000		227,828,000
Equity securities, gross unrealized gains	28,713,000		26,712,000
Equity securities, gross unrealized losses	-2,219,000		-2,074,000
Equity securities, fair value	271,530,000		252,466,000
Non-Credit OTTI	0	[1]	0	[2]
Collateralized Debt Obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Debt securities, fair value	$17,100,000		$18,700,000

[1]	Represents total OTTI recognized in accumulated other comprehensive income. It does not include the change in fair value subsequent to the impairment measurement date. At March 31, 2014, the gross unrealized loss related to fixed income investments for which a non-credit OTTI was recognized in accumulated other comprehensive income was nil.
[2]	Represents total OTTI recognized in accumulated other comprehensive income. It does not include the change in fair value subsequent to the impairment measurement date. At December 31, 2013, the gross unrealized loss related to fixed income investments for which a non-credit OTTI was recognized in accumulated other comprehensive income was $0.1 million.
[3]	Balances include amounts related to collateralized debt obligations held with total fair values of $17.1 million.
[4]	Balances include amounts related to collateralized debt obligations held with total fair values of $18.7 million.

Investments_Available_For_Sale

Investments (Available For Sale Securities In An Unrealized Loss Position) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, 12 months or greater	($5,394)	[1]	($5,826)	[2]
Unrealized Losses	-29,709	[1]	-49,620	[2]
U.S. Government And Agencies Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-4,601	[1]	-7,359	[2]
Fair Value, Less than 12 months	224,226		382,593
Unrealized Losses, 12 months or greater	-268	[1]	-260	[2]
Fair Value, 12 months or greater	9,546		6,050
Unrealized Losses	-4,869	[1]	-7,619	[2]
Fair Value	233,772		388,643
U.S. State And Municipal Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-203	[1]	-395	[2]
Fair Value, Less than 12 months	14,959		20,452
Unrealized Losses, 12 months or greater	0	[1]	0	[2]
Fair Value, 12 months or greater	0		0
Unrealized Losses	-203	[1]	-395	[2]
Fair Value	14,959		20,452
Foreign Government Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-927	[1]	-1,981	[2]
Fair Value, Less than 12 months	93,615		139,503
Unrealized Losses, 12 months or greater	-47	[1]	-25	[2]
Fair Value, 12 months or greater	4,391		5,261
Unrealized Losses	-974	[1]	-2,006	[2]
Fair Value	98,006		144,764
Government Guaranteed Corporate Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-25	[1]	-50	[2]
Fair Value, Less than 12 months	29,341		13,326
Unrealized Losses, 12 months or greater	0	[1]	0	[2]
Fair Value, 12 months or greater	0		0
Unrealized Losses	-25	[1]	-50	[2]
Fair Value	29,341		13,326
Corporate Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-3,485	[1]	-5,959	[2]
Fair Value, Less than 12 months	359,495		478,287
Unrealized Losses, 12 months or greater	-275	[1]	-552	[2]
Fair Value, 12 months or greater	20,341		28,690
Unrealized Losses	-3,760	[1]	-6,511	[2]
Fair Value	379,836		506,977
Residential Mortgage-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-9,124	[1]	-17,572	[2]
Fair Value, Less than 12 months	390,553		524,731
Unrealized Losses, 12 months or greater	-3,176	[1]	-4,357	[2]
Fair Value, 12 months or greater	82,688		102,446
Unrealized Losses	-12,300	[1]	-21,929	[2]
Fair Value	473,241		627,177
Commercial Mortgage-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-3,778	[1]	-7,664	[2]
Fair Value, Less than 12 months	229,417		377,969
Unrealized Losses, 12 months or greater	-914	[1]	-480	[2]
Fair Value, 12 months or greater	31,011		19,183
Unrealized Losses	-4,692	[1]	-8,144	[2]
Fair Value	260,428		397,152
Asset-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-508	[1]	-738	[2]
Fair Value, Less than 12 months	140,501		174,455
Unrealized Losses, 12 months or greater	-150	[1]	-152	[2]
Fair Value, 12 months or greater	10,549		7,011
Unrealized Losses	-658	[1]	-890	[2]
Fair Value	151,050		181,466
Fixed Maturity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-22,651	[1]	-41,718	[2]
Fair Value, Less than 12 months	1,482,107		2,111,316
Unrealized Losses, 12 months or greater	-4,830	[1]	-5,826	[2]
Fair Value, 12 months or greater	158,526		168,641
Unrealized Losses	-27,481	[1]	-47,544	[2]
Fair Value	1,640,633		2,279,957
Short Term Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-9	[1]	-2	[2]
Fair Value, Less than 12 months	36,403		2,468
Unrealized Losses, 12 months or greater	0	[1]	0	[2]
Fair Value, 12 months or greater	0		0
Unrealized Losses	-9	[1]	-2	[2]
Fair Value	36,403		2,468
Fixed Income Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-22,660	[1]	-41,720	[2]
Fair Value, Less than 12 months	1,518,510		2,113,784
Unrealized Losses, 12 months or greater	-4,830	[1]	-5,826	[2]
Fair Value, 12 months or greater	158,526		168,641
Unrealized Losses	-27,490	[1]	-47,546	[2]
Fair Value	1,677,036		2,282,425
Equity Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-1,638	[1]	-1,995	[2]
Fair Value, Less than 12 months	27,109		36,751
Unrealized Losses, 12 months or greater	-564	[1]	0	[2]
Fair Value, 12 months or greater	8,565		0
Unrealized Losses	-2,202	[1]	-1,995	[2]
Fair Value	35,674		36,751
Preferred Equity Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-17	[1]	-79	[2]
Fair Value, Less than 12 months	1,053		2,987
Unrealized Losses, 12 months or greater	0	[1]	0	[2]
Fair Value, 12 months or greater	0		0
Unrealized Losses	-17	[1]	-79	[2]
Fair Value	1,053		2,987
Total Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Unrealized Losses, Less than 12 months	-1,655	[1]	-2,074	[2]
Fair Value, Less than 12 months	28,162		39,738
Unrealized Losses, 12 months or greater	-564	[1]	0	[2]
Fair Value, 12 months or greater	8,565		0
Unrealized Losses	-2,219	[1]	-2,074	[2]
Fair Value	$36,727		$39,738

[1]	Gross unrealized losses include unrealized losses on non-OTTI securities recognized in accumulated other comprehensive income at March 31, 2014.
[2]	Gross unrealized losses include unrealized losses on non-OTTI and non-credit OTTI securities recognized in accumulated other comprehensive income at December 31, 2013.

Investments_Analysis_Of_OTTI_D

Investments (Analysis Of OTTI) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Investments	'	'
Total other-than-temporary impairment losses	($111)	($806)
Portion of loss recognized in other comprehensive income (loss)	0	0
Net impairment losses recognized in earnings	($111)	($806)

Investments_Credit_Losses_Roll

Investments (Credit Losses Rollforward) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Investments	'	'
Beginning balance	($1,553)	($2,000)
Addition for the amount related to the credit loss for which an other-than-temporary impairment was not previously recognized	0	0
Addition for the amount related to the credit loss for which an other-than-temporary impairment was previously recognized	0	0
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security	'	'
Reductions for securities sold during the period	33	117
Ending balance	($1,520)	($1,883)

Fair_Value_Measurement_Narrati

Fair Value Measurement (Narrative) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Fair Value, Assets and Liabilities [Line Items]	'	'	'
Net impairment losses recognized in earnings	$111	$806	'
Derivative Assets	74,974	'	108,272
Derivative Liabilities	32,209	'	49,452
Transfers into Level 3	2,117	3,264	'
Transfers out of Level 3	-263	-56	'
Energy Related Derivative [Member]	'	'	'
Fair Value, Assets and Liabilities [Line Items]	'	'	'
Derivative Assets	8,532	'	14,038
Derivative Liabilities	13,448	'	19,569
Significant Unobservable Inputs (Level 3) [Member]	'	'	'
Fair Value, Assets and Liabilities [Line Items]	'	'	'
Percentage of level 3 assets	11.00%	'	10.90%
Net impairment losses recognized in earnings	0	0	'
Derivative Assets	8,532	'	14,038
Derivative Liabilities	$13,448	'	$19,569

Fair_Value_Measurement_Schedul

Fair Value Measurement (Schedule Of Available For Sale Investments, Other Investments, Derivative Instruments And Debt) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	$4,794,445		$4,823,964
Short term investments	46,167		35,028
Equity securities	271,530		252,466
Other investments	621,914		617,478
Other assets (see Note 7)	74,974		108,272
Total assets	5,809,030		5,837,208
Other liabilities (see Note 7)	32,209		49,452
Debt	594,413		575,115
Total liabilities	626,622		624,567
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	3,634		20,248
Short term investments	0		0
Equity securities	141,621		126,506
Other investments	0		0
Other assets (see Note 7)	0		0
Total assets	145,255		146,754
Other liabilities (see Note 7)	0		0
Debt	0		0
Total liabilities	0		0
Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	4,781,826		4,796,388
Short term investments	46,167		35,028
Equity securities	129,909		125,960
Other investments	0		0
Other assets (see Note 7)	66,442		94,234
Total assets	5,024,344		5,051,610
Other liabilities (see Note 7)	18,761		29,883
Debt	594,413		575,115
Total liabilities	613,174		604,998
Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	8,985		7,328
Short term investments	0		0
Equity securities	0		0
Other investments	621,914		617,478
Other assets (see Note 7)	8,532		14,038
Total assets	639,431		638,844
Other liabilities (see Note 7)	13,448		19,569
Debt	0		0
Total liabilities	13,448		19,569
U.S. Government And Agencies Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	627,748		769,343
U.S. Government And Agencies Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	3,634		20,248
U.S. Government And Agencies Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	624,114		749,095
U.S. Government And Agencies Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
U.S. State And Municipal Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	28,132		26,854
U.S. State And Municipal Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
U.S. State And Municipal Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	28,132		26,854
U.S. State And Municipal Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
Foreign Government Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	204,425		182,647
Foreign Government Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
Foreign Government Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	204,425		182,647
Foreign Government Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
Government Guaranteed Corporate Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	49,626		35,145
Government Guaranteed Corporate Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
Government Guaranteed Corporate Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	49,626		35,145
Government Guaranteed Corporate Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
Corporate Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	1,255,579		1,227,299
Corporate Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
Corporate Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	1,254,842		1,226,553
Corporate Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	737		746
Residential Mortgage-Backed Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	1,183,421		1,197,221
Residential Mortgage-Backed Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
Residential Mortgage-Backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	1,183,386		1,196,973
Residential Mortgage-Backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	35		248
Commercial Mortgage-Backed Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	971,959	[1]	952,887	[2]
Commercial Mortgage-Backed Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
Commercial Mortgage-Backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	966,775		949,547
Commercial Mortgage-Backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	5,184		3,340
Asset-Backed Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	473,555		432,568
Asset-Backed Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	0		0
Asset-Backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	470,526		429,574
Asset-Backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	3,029		2,994
Fixed Maturity Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Total fixed maturity investments	4,794,445		4,823,964
Equity Investments [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	194,583		174,669
Equity Investments [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	136,292		117,776
Equity Investments [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	58,291		56,893
Equity Investments [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	0		0
Emerging Market Debt Funds [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	61,790		60,844
Emerging Market Debt Funds [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	0		0
Emerging Market Debt Funds [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	61,790		60,844
Emerging Market Debt Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	0		0
Preferred Equity Investments [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	9,828		8,223
Preferred Equity Investments [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	0		0
Preferred Equity Investments [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	9,828		8,223
Preferred Equity Investments [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	0		0
Short-term Fixed Income Fund [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	5,329		8,730
Short-term Fixed Income Fund [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	5,329		8,730
Short-term Fixed Income Fund [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	0		0
Short-term Fixed Income Fund [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	0		0
Total Equity Securities [Member]	'		'
Fair Value, Assets and Liabilities [Line Items]	'		'
Equity securities	$271,530		$252,466

[1]	Balances include amounts related to collateralized debt obligations held with total fair values of $17.1 million.
[2]	Balances include amounts related to collateralized debt obligations held with total fair values of $18.7 million.

Fair_Value_Measurement_Reconci

Fair Value Measurement (Reconciliation Of The Beginning And Ending Balances For Fixed Maturity And Other Investments Measured At Fair Value On A Recurring Basis Using Level 3 Inputs) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Level 3, beginning of period	$638,844	$526,925
Total equity income and realized gains included in earnings	19,203	25,488
Total equity losses and realized losses included in earnings	-5,671	-2,424
Change in unrealized gains included in other comprehensive income (loss)	111	84
Change in unrealized losses included in other comprehensive income (loss)	-115	-54
Purchases	4,674	21,990
Sales	-13,963	-9,806
Transfers into Level 3	2,117	3,264
Transfers out of Level 3	-263	-56
Level 3, end of period	639,431	564,535
Fixed Maturity Investments [Member]	'	'
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Level 3, beginning of period	7,328	8,497
Total equity income and realized gains included in earnings	17	5
Total equity losses and realized losses included in earnings	-26	0
Change in unrealized gains included in other comprehensive income (loss)	111	84
Change in unrealized losses included in other comprehensive income (loss)	-115	-54
Purchases	0	0
Sales	-184	-1,926
Transfers into Level 3	2,117	3,264
Transfers out of Level 3	-263	-56
Level 3, end of period	8,985	9,814
Other Investments [Member]	'	'
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Level 3, beginning of period	617,478	517,546
Total equity income and realized gains included in earnings	19,186	25,483
Total equity losses and realized losses included in earnings	-5,645	-2,424
Change in unrealized gains included in other comprehensive income (loss)	0	0
Change in unrealized losses included in other comprehensive income (loss)	0	0
Purchases	4,674	21,990
Sales	-13,779	-7,880
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Level 3, end of period	$621,914	$554,715

Fair_Value_Measurement_Reconci1

Fair Value Measurement (Reconciliation Of The Beginning And Ending Balances For Derivative Assets and Liabilities Measured At Fair Value On A Recurring Basis Using Level 3 Inputs) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Total income included in other underwriting (loss) income	$3,975	$0
Total loss included in other underwriting (loss) income	-6,888	-1,176
Issues	640	300
Settlements	-3,233	'
Other Assets [Member]	'	'
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Level 3, beginning of period, other assets (liabilities)	14,038	882
Total income included in other underwriting (loss) income	3,975	0
Total loss included in other underwriting (loss) income	-6,888	-1,176
Issues	640	300
Settlements	-3,233	'
Level 3, end of period, other assets (liabilities)	8,532	6
Other Liabilities [Member]	'	'
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Level 3, beginning of period, other assets (liabilities)	-19,569	-1,922
Total income included in other underwriting (loss) income	7,426	2,342
Total loss included in other underwriting (loss) income	-4,776	0
Issues	-1,280	-432
Settlements	4,751	'
Level 3, end of period, other assets (liabilities)	($13,448)	($12)

Fair_Value_Measurement_Quantit

Fair Value Measurement (Quantitative Information Used As Level 3 Inputs) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
			Significant Unobservable Inputs (Level 3) [Member]	Significant Unobservable Inputs (Level 3) [Member]	Significant Unobservable Inputs (Level 3) [Member]
			Energy Related Derivative [Member]	Simulation Valuation Technique [Member]	Simulation Valuation Technique [Member]
				Maximum [Member]	Minimum [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]	'	'	'	'	'
Correlation	'	'	'	1	0
Weather curve	'	'	'	'3,500	'2,155
Commodity curve	'	'	'	$8	$2.95
Net derivative liability	$42,765,000	$58,820,000	($4,916,000)	'	'

Earnings_Per_Share_Schedule_Of

Earnings Per Share (Schedule Of Computing Basic And Diluted Earnings Per Share) (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Net income available to common and participating common shareholders	$96,292		$92,111
Less amount allocated to participating common shareholders	-2,769	[1]	-1,510	[1]
Net income allocated to common shareholders	$93,523		$90,601
Weighted average shares - basic	43,160,156		42,431,020
Weighted average shares - diluted	43,160,442		42,443,936
Basic earnings per common share	$2.17		$2.13
Diluted earnings per common share	$2.17		$2.13
Employee Stock Option [Member]	'		'
Share equivalents	0		11,799
Restricted Stock [Member]	'		'
Share equivalents	286		1,117

[1]	Represents earnings attributable to holders of unvested restricted shares 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).

Earnings_Per_Share_Schedule_Of1

Earnings Per Share (Schedule Of Dividends Declared) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Dividend Per Share Basic [Line Items]	'	'
Dividends declared per common share	$0.34	$0.32
Series A Preferred Stock [Member]	'	'
Dividend Per Share Basic [Line Items]	'	'
Dividends declared per preferred share	$0.48	$0.48
Series B Preferred Stock [Member]	'	'
Dividend Per Share Basic [Line Items]	'	'
Dividends declared per preferred share	$0.47	$0.47

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Schedule Of Changes In Accumulated Other Comprehensive Income By Component) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Accumulated Other Comprehensive Income [Line Items]	'		'
Beginning balance	$62,731		$152,463
Other comprehensive income before reclassifications	30,890		-10,097
Amounts reclassified from accumulated other comprehensive income	-4,262	[1]	-4,927	[1]
Net current period other comprehensive income (loss)	26,628		-15,024
Ending balance	89,359		137,439
Accumulated Derivative Loss On Cash Flow Hedging Instruments [Member]	'		'
Accumulated Other Comprehensive Income [Line Items]	'		'
Beginning balance	-1,855		-1,944
Other comprehensive income before reclassifications	0		0
Amounts reclassified from accumulated other comprehensive income	23	[1]	16	[1]
Net current period other comprehensive income (loss)	23		16
Ending balance	-1,832		-1,928
Unrealized Holding Gains And Losses On AFS Investments, Net Of Deferred Taxes [Member]	'		'
Accumulated Other Comprehensive Income [Line Items]	'		'
Beginning balance	45,950		141,731
Other comprehensive income before reclassifications	27,665		97
Amounts reclassified from accumulated other comprehensive income	-4,285	[1]	-4,943	[1]
Net current period other comprehensive income (loss)	23,380		-4,846
Ending balance	69,330		136,885
Cumulative Foreign Currency Translation Adjustments [Member]	'		'
Accumulated Other Comprehensive Income [Line Items]	'		'
Beginning balance	18,636		12,676
Other comprehensive income before reclassifications	3,225		-10,194
Amounts reclassified from accumulated other comprehensive income	0	[1]	0	[1]
Net current period other comprehensive income (loss)	3,225		-10,194
Ending balance	$21,861		$2,482

[1]	All amounts are net of tax.

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Schedule Of Reclassifications Out Of Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'	'
Interest expense	($9,051)	($9,038)
Net realized and unrealized investment gains	4,872	6,235
Net impairment losses recognized in earnings	-111	-806
Income before income taxes	104,888	104,450
Income tax expense	-408	-4,151
Net income	104,480	100,299
Accumulated Derivative Loss On Cash Flow Hedging Instruments [Member] \| Reclassification Out Of Accumulated Other Comprehensive Income [Member]	'	'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'	'
Interest expense	23	16
Income before income taxes	23	16
Income tax expense	0	0
Net income	23	16
Unrealized Holding Gains And Losses On AFS Investments, Net Of Deferred Taxes [Member] \| Reclassification Out Of Accumulated Other Comprehensive Income [Member]	'	'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'	'
Net realized and unrealized investment gains	-4,263	-5,957
Net impairment losses recognized in earnings	111	806
Income before income taxes	-4,152	-5,151
Income tax expense	-133	208
Net income	($4,285)	($4,943)

Derivatives_Schedule_Of_Deriva

Derivatives (Schedule Of Derivative Fair Value And Notional Amount) (Details) (USD $)

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Foreign Exchange Forward Contracts [Member]

Credit Default Swaps [Member]

Interest Rate Swaps [Member]

Interest Rate Swaptions [Member]

TBA [Member]

Energy and weather contracts [Member]

Interest Rate Future [Member]

Derivatives, Fair Value [Line Items]

Derivative recorded in other liabilities, Fair Value

$32,209,000

$49,452,000

$215,000

$172,000

$911,000

$933,000

$543,000

$17,635,000

$28,218,000

$13,448,000

$19,569,000

$17,000

Derivatives recorded in other assets, Fair Value

74,974,000

108,272,000

175,000

251,000

40,000

124,000

1,000

39,000

66,196,000

93,820,000

8,532,000

14,038,000

30,000

Net derivative asset, Fair Value

42,765,000

58,820,000

Derivatives recorded in other asset, Notional Principal Amount

15,427,000

19,269,000

20,200,000

16,100,000

24,361,000

24,338,000

66,000,000

93,840,000

51,757,000

53,986,000

103,955,000

Derivatives recorded in other liabilities, Notional Principal Amount

15,722,000

15,861,000

12,614,000

12,193,000

27,861,000

361,455,000

18,000,000

28,000,000

61,655,000

66,113,000

103,935,000

Original term of credit default swap, in years

'5 years 0 months 0 days

Derivative assets traded under master netting agreements

74,900,000

108,300,000

Derivative liabilities traded under master netting agreements

$32,200,000

$49,400,000

Derivatives_Schedule_Of_Deriva1

Derivatives (Schedule Of Derivative Gain (Loss)) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]	'	'
Derivatives included in net foreign exchange losses from foreign exchange forward contracts	($227)	$161
Derivatives included in net realized and unrealized investment gains	609	279
Derivatives included in other underwriting (loss) income from energy and weather contracts	-258	1,166
Total gains from derivatives	124	1,606
Interest Rate Future [Member]	'	'
Derivative [Line Items]	'	'
Derivatives included in net realized and unrealized investment gains	21	0
Credit Default Swaps [Member]	'	'
Derivative [Line Items]	'	'
Derivatives included in net realized and unrealized investment gains	0	3
Interest Rate Swaps [Member]	'	'
Derivative [Line Items]	'	'
Derivatives included in net realized and unrealized investment gains	-766	118
Interest Rate Swaptions [Member]	'	'
Derivative [Line Items]	'	'
Derivatives included in net realized and unrealized investment gains	429	175
TBA [Member]	'	'
Derivative [Line Items]	'	'
Derivatives included in net realized and unrealized investment gains	$925	($17)

StockBased_Employee_Compensati1

Stock-Based Employee Compensation And Other Stock Plans (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
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
Total intrinsic value of options exercised	$0	$200,000
Proceeds from stock options exercised	0	300,000
Number of restricted shares and RSUs granted	335,771	343,384
Restricted shares and RSUs weighted average grant date fair value	17,600,000	15,200,000
Aggregate fair value of restricted shares and RSUs vested	9,800,000	9,100,000
Expenses related to employee stock purchase plan	54,000	38,000
Employee Stock Option [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Compensation costs recognized	1,100,000	'
Compensation costs not yet recognized	4,600,000	'
Restricted Stock [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Compensation costs recognized	9,100,000	4,700,000
Compensation costs not yet recognized	$34,900,000	$15,300,000

Segment_Reporting_Summary_Of_T

Segment Reporting (Summary Of The Segment Revenues, Results And Reserve For Losses And Loss Expenses) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]	'	'	'
Gross premiums written	$1,157,515	$1,177,362	'
Ceded premiums written	-358,810	-268,447	'
Net premiums written	798,705	908,915	'
Net premiums earned	396,266	420,117	'
Other underwriting (loss) income	-1,238	749	'
Total revenue	395,028	420,866	'
Net losses and loss expenses	176,896	218,970	'
Acquisition expenses	72,157	71,636	'
General and administrative expenses	73,206	66,478	'
Total expenses	322,259	357,084	'
Underwriting income	72,769	63,782	'
Net loss ratio	44.60%	52.10%	'
Acquisition expense ratio	18.20%	17.10%	'
General and administrative expense ratio	18.50%	15.80%	'
Combined ratio	81.30%	85.00%	'
Reserve for losses and loss expenses	3,847,774	4,026,536	4,002,259
Insurance [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Gross premiums written	652,276	652,943	'
Ceded premiums written	-309,249	-248,249	'
Net premiums written	343,027	404,694	'
Net premiums earned	144,021	151,152	'
Other underwriting (loss) income	0	0	'
Total revenue	144,021	151,152	'
Net losses and loss expenses	88,533	99,464	'
Acquisition expenses	12,261	14,616	'
General and administrative expenses	41,288	35,627	'
Total expenses	142,082	149,707	'
Underwriting income	1,939	1,445	'
Net loss ratio	61.50%	65.70%	'
Acquisition expense ratio	8.50%	9.70%	'
General and administrative expense ratio	28.70%	23.60%	'
Combined ratio	98.70%	99.00%	'
Reserve for losses and loss expenses	2,023,819	2,120,865	'
Reinsurance [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Gross premiums written	505,239	524,419	'
Ceded premiums written	-49,561	-20,198	'
Net premiums written	455,678	504,221	'
Net premiums earned	252,245	268,965	'
Other underwriting (loss) income	-1,238	749	'
Total revenue	251,007	269,714	'
Net losses and loss expenses	88,363	119,506	'
Acquisition expenses	59,896	57,020	'
General and administrative expenses	31,918	30,851	'
Total expenses	180,177	207,377	'
Underwriting income	70,830	62,337	'
Net loss ratio	35.00%	44.40%	'
Acquisition expense ratio	23.70%	21.20%	'
General and administrative expense ratio	12.70%	11.50%	'
Combined ratio	71.40%	77.10%	'
Reserve for losses and loss expenses	$1,823,955	$1,905,671	'

Segment_Reporting_Schedule_Of_

Segment Reporting (Schedule Of Segment Results To Income Before Income Taxes) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting	'	'
Total underwriting income	$72,769	$63,782
Net investment income	40,990	49,305
Net foreign exchange losses	-2,964	-2,927
Net realized and unrealized investment gains	4,872	6,235
Net impairment losses recognized in earnings	-111	-806
Amortization of intangibles	-1,617	-2,101
Interest expense	-9,051	-9,038
Income before income taxes	$104,888	$104,450

Segment_Reporting_Schedule_Of_1

Segment Reporting (Schedule Of Gross And Net Premiums By Line Of Business) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue from External Customer [Line Items]	'	'
Gross premiums written	$1,157,515	$1,177,362
Net premiums written	798,705	908,915
Insurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	652,276	652,943
Net premiums written	343,027	404,694
Agriculture Insurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	527,894	564,474
Net premiums written	281,645	341,130
Casualty And Other Specialty Insurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	74,895	56,467
Net premiums written	41,721	43,261
Professional Lines Insurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	38,780	20,964
Net premiums written	14,570	14,203
Property Insurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	10,707	11,038
Net premiums written	5,091	6,100
Reinsurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	505,239	524,419
Net premiums written	455,678	504,221
Catastrophe Reinsurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	126,648	147,866
Net premiums written	78,963	131,398
Casualty Reinsurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	84,982	129,392
Net premiums written	83,392	127,963
Property Reinsurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	166,413	148,411
Net premiums written	166,322	148,411
Professional Lines Reinsurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	25,619	12,307
Net premiums written	25,619	12,307
Specialty Reinsurance [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Gross premiums written	101,577	86,443
Net premiums written	$101,382	$84,142

Commitments_And_Contingencies_1

Commitments And Contingencies (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Commitments And Contingencies	'	'	'
Investments pledged under letters of credit facility	$273	'	$302.70
Securities pledged as collateral obligation	149.4	'	146.1
Total lease expenses under operating leases	4.2	3.6	'
Ceded Credit Risk [Line Items]	'	'	'
Reinsurance recoverables	594.1	'	758
Ceded Credit Risk Secured [Member]	'	'	'
Ceded Credit Risk [Line Items]	'	'	'
Reinsurance recoverables	$112.20	'	$14.20

Commitments_And_Contingencies_2

Commitments And Contingencies (Deposits) (Details) (US, USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
US	'	'
Statutory Accounting Practices [Line Items]	'	'
Assets Held by Insurance Regulators	$273.90	$273.70

Commitments_And_Contingencies_3

Commitments And Contingencies (LOC) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Commitments [Line Items]	'	'
Letters of credit outstanding, amount	$230	$260.30
ANZ [Member]	'	'
Other Commitments [Line Items]	'	'
Letters of credit outstanding, amount	1.4	0
Letter of credit reimbursement agreement	$50	'

Commitments_And_Contingencies_4

Commitments And Contingencies (Schedule Of Future Minimum Lease Commitments) (Details) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified	Mar. 31, 2014
Commitments And Contingencies	'
2015	$16,062
2016	15,012
2017	11,939
2018	11,796
2019	10,628
2020 and thereafter	41,998
Total	$107,435

Commitments_And_Contingencies_5

Commitments And Contingencies (Schedule Of Percentage Of Net Premiums) (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue from External Customer [Line Items]	'	'
Percentage of net premium written	43.80%	39.20%
Aon Benfield [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Percentage of net premium written	15.10%	17.70%
Marsh & Mclennan Companies, Inc. [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Percentage of net premium written	16.70%	13.30%
Willis Companies [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Percentage of net premium written	12.00%	8.20%