Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 454,126us-gaap_NetIncomeLoss	$ 798,263us-gaap_NetIncomeLoss	$ 520,329us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	83,362	(175,854)	(141,501)
Decrease (increase) in funds held by reinsureds, net	2,236	(12,075)	(17,897)
Decrease (increase) in reinsurance receivables	(460,635)	25,665	(152,887)
Decrease (increase) in income taxes	68,206	351,573	124,739
Decrease (increase) in prepaid reinsurance premiums	(138,010)	(118,173)	68,312
Increase (decrease) in reserve for losses and loss adjustment expenses	248,053	(439,560)	(206,435)
Increase (decrease) in unearned premiums	130,519	228,097	(150,747)
Increase (decrease) in other net payable to reinsurers	5,130	127,252	270,776
Increase (decrease) in losses in course of payment	(171,071)	171,829	169,698
Change in equity adjustments in limited partnerships	(28,249)	(35,721)	(38,579)
Distribution of limited partnership income	41,064	24,133	19,490
Change in other assets and liabilities, net	81,388	25,049	44,032
Non-cash compensation expense	7,911us-gaap_ShareBasedCompensation	7,983us-gaap_ShareBasedCompensation	6,803us-gaap_ShareBasedCompensation
Amortization of bond premium (accrual of bond discount)	19,086	25,599	19,124
Amortization of underwriting discount on senior notes	46us-gaap_AmortizationOfFinancingCosts	54us-gaap_AmortizationOfFinancingCosts	52us-gaap_AmortizationOfFinancingCosts
Net realized capital (gains) losses	(206,679)us-gaap_RealizedInvestmentGainsLosses	(723,149)us-gaap_RealizedInvestmentGainsLosses	(391,702)us-gaap_RealizedInvestmentGainsLosses
Net cash provided by (used in) operating activities	136,483	280,965	143,607
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	1,071,296	1,099,850	927,867
Proceeds from fixed maturities matured/called - available for sale, at fair value	875	7,213	1,300
Proceeds from fixed maturities sold - available for sale, at market value	1,080,276	598,342	476,491
Proceeds from fixed maturities sold - available for sale, at fair value	36,467	21,572	84,917
Proceeds from equity securities sold - available for sale, at fair value	528,958	612,516	546,463
Distributions from other invested assets	72,323	64,483	29,198
Cost of fixed maturities acquired - available for sale, at market value	(2,406,162)	(1,611,791)	(1,784,344)
Cost of fixed maturities acquired - available for sale, at fair value	(24,097)	(6,196)	(7,955)
Cost of equity securities acquired - available for sale, at fair value	(416,375)	(439,115)	(404,051)
Cost of other invested assets acquired	(134,373)	(17,926)	(51,512)
Net change in short-term investments	189,139	(292,751)	(42,027)
Net cost of lending for long term note - affiliated	(250,000)
Net change in unsettled securities transactions	(4,157)	(3,057)	35,075
Net cash provided by (used in) investing activities	(255,830)	33,140	(188,578)
CASH FLOWS FROM FINANCING ACTIVITIES:
Tax benefit from share-based compensation	3,331	2,845	4
Net cost of junior subordinated debt securities redemption		(329,897)
Proceeds from issuance of senior notes	400,000
Net cost of senior notes maturing	(250,000)us-gaap_MaturitiesOfSeniorDebt
Net cash provided by (used in) financing activities	153,331	(327,052)	4
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(26,816)	(17,966)	44,420
Net increase (decrease) in cash	7,168	(30,913)	(547)
Cash, beginning of period	316,807	347,720	348,267
Cash, end of period	323,975	316,807	347,720
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	133,057us-gaap_IncomeTaxesPaidNet	51,045us-gaap_IncomeTaxesPaidNet	38,548us-gaap_IncomeTaxesPaidNet
Interest paid	$ 38,861us-gaap_InterestPaidNet	$ 37,725us-gaap_InterestPaidNet	$ 50,072us-gaap_InterestPaidNet

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