Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 115,944us-gaap_NetIncomeLoss	$ 86,466us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	(78,969)	12,611
Decrease (increase) in funds held by reinsureds, net	(4,707)	2,877
Decrease (increase) in reinsurance receivables	(68,311)	(279,364)
Decrease (increase) in income taxes	31,408	24,447
Decrease (increase) in prepaid reinsurance premiums	15,016	(47,040)
Increase (decrease) in reserve for losses and loss adjustment expenses	20,927	(58,410)
Increase (decrease) in unearned premiums	(28,224)	76,126
Increase (decrease) in other net payable to reinsurers	(52,400)	130,527
Increase (decrease) in losses in course of payment	60,419	101,869
Change in equity adjustments in limited partnerships	(7,173)	3,143
Distribution of limited partnership income	7,369	5,824
Change in other assets and liabilities, net	35,494	(16,618)
Non-cash compensation expense	1,946us-gaap_ShareBasedCompensation	1,729us-gaap_ShareBasedCompensation
Amortization of bond premium (accrual of bond discount)	4,955	6,004
Amortization of underwriting discount on senior notes	1us-gaap_AmortizationOfFinancingCosts	14us-gaap_AmortizationOfFinancingCosts
Net realized capital (gains) losses	(21,296)us-gaap_RealizedInvestmentGainsLosses	4,050us-gaap_RealizedInvestmentGainsLosses
Net cash provided by (used in) operating activities	32,399	54,255
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	188,815	207,534
Proceeds from fixed maturities matured/called - available for sale, at fair value		875
Proceeds from fixed maturities sold - available for sale, at market value	112,846	149,578
Proceeds from fixed maturities sold - available for sale, at fair value	1,236	20,763
Proceeds from equity securities sold - available for sale, at fair value	133,960	176,116
Distributions from other invested assets	10,797	9,828
Cost of fixed maturities acquired - available for sale, at market value	(293,848)	(689,205)
Cost of fixed maturities acquired - available for sale, at fair value		(1,309)
Cost of equity securities acquired - available for sale, at fair value	(164,112)	(77,427)
Cost of other invested assets acquired	(16,600)	(4,961)
Net change in short-term investments	(860)	113,571
Net change in unsettled securities transactions	(31,296)	(8,812)
Net cash provided by (used in) investing activities	(59,062)	(103,449)
CASH FLOWS FROM FINANCING ACTIVITIES:
Tax benefit from share-based compensation	2,020	1,665
Net cash provided by (used in) financing activities	2,020	1,665
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(31,845)	3,987
Net increase (decrease) in cash	(56,488)	(43,542)
Cash, beginning of period	323,975	316,807
Cash, end of period	267,487	273,265
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	18,077us-gaap_IncomeTaxesPaidNet	12,474us-gaap_IncomeTaxesPaidNet
Interest paid		$ 42us-gaap_InterestPaidNet

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