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)	$ 1,258,463us-gaap_ProfitLoss	$ 1,265,260us-gaap_ProfitLoss	$ 828,954us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	45,282	(217,678)	(153,694)
Decrease (increase) in funds held by reinsureds, net	(1,835)	162	42,298
Decrease (increase) in reinsurance receivables	(186,014)	118,963	(55,274)
Decrease (increase) in income taxes	31,340	213,848	38,078
Decrease (increase) in prepaid reinsurance premiums	(79,086)	(12,777)	16,358
Increase (decrease) in reserve for losses and loss adjustment expenses	195,524	(374,027)	(169,595)
Increase (decrease) in future policy benefit reserve	308	(6,595)	(1,080)
Increase (decrease) in unearned premiums	161,149	261,959	(98,418)
Increase (decrease) in other net payable to reinsurers	29,410	(45,043)	100,566
Increase (decrease) in losses in course of payment	(174,206)	142,192	173,232
Change in equity adjustments in limited partnerships	(39,464)	(45,905)	(63,779)
Distribution of limited partnership income	51,120	56,982	30,718
Change in other assets and liabilities, net	35,419	(57,212)	76,788
Non-cash compensation expense	21,197us-gaap_ShareBasedCompensation	31,844us-gaap_ShareBasedCompensation	31,984us-gaap_ShareBasedCompensation
Amortization of bond premium (accrual of bond discount)	49,214	66,461	61,844
Amortization of underwriting discount on senior notes	46us-gaap_AmortizationOfFinancingCosts	54us-gaap_AmortizationOfFinancingCosts	52us-gaap_AmortizationOfFinancingCosts
Net realized capital (gains) losses	(84,046)us-gaap_RealizedInvestmentGainsLosses	(300,227)us-gaap_RealizedInvestmentGainsLosses	(164,400)us-gaap_RealizedInvestmentGainsLosses
Net cash provided by (used in) operating activities	1,313,821	1,098,261	694,632
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	2,142,693	2,415,730	1,830,582
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	1,811,801	1,092,387	913,139
Proceeds from fixed maturities sold - available for sale, at fair value	36,467	21,573	84,917
Proceeds from equity securities sold - available for sale, at market value	16,901	46,142	280,807
Proceeds from equity securities sold - available for sale, at fair value	584,069	705,831	558,740
Distributions from other invested assets	115,482	100,081	53,736
Cost of fixed maturities acquired - available for sale, at market value	(4,672,633)	(3,543,776)	(3,328,409)
Cost of fixed maturities acquired - available for sale, at fair value	(24,098)	(6,196)	(7,955)
Cost of equity securities acquired - available for sale, at market value	(18,016)	(59,756)	(26,571)
Cost of equity securities acquired - available for sale, at fair value	(446,457)	(621,038)	(426,507)
Cost of other invested assets acquired	(224,740)	(21,935)	(58,369)
Net change in short-term investments	(497,983)	(357,451)	(175,043)
Net change in unsettled securities transactions	(4,433)	(2,808)	35,085
Net cash provided by (used in) investing activities	(1,180,072)	(224,003)	(264,548)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common shares issued during the period, net	17,839	51,500	21,473
Purchase of treasury shares	(500,024)	(621,915)	(289,988)
Net cost of junior subordinated debt securities redemption		(329,897)us-gaap_RepaymentsOfSubordinatedDebt
Net cost of senior notes maturing	(250,000)us-gaap_MaturitiesOfSeniorDebt
Proceeds from issuance of senior notes	400,000
Third party investment in redeemable noncontrolling interest	136,200	87,500
Subscription advances for third party redeemable noncontrolling interest	40,000	143,000
Dividends paid to shareholders	(145,913)us-gaap_PaymentsOfDividendsCommonStock	(106,681)us-gaap_PaymentsOfDividendsCommonStock	(100,402)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid on third party investment in redeemable noncontrolling interest	(10,334)
Net cash provided by (used in) financing activities	(312,232)	(776,493)	(368,917)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	4,575	(23,433)	27,232
Net increase (decrease) in cash	(173,908)	74,332	88,399
Cash, beginning of period	611,382	537,050	448,651
Cash, end of period	437,474	611,382	537,050
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	153,455us-gaap_IncomeTaxesPaidNet	69,302us-gaap_IncomeTaxesPaidNet	59,754us-gaap_IncomeTaxesPaidNet
Interest paid	39,424us-gaap_InterestPaidNet	38,390us-gaap_InterestPaidNet	53,008us-gaap_InterestPaidNet
Non-cash transaction:
Conversion of equity securities - available for sale, at market value, to fixed maturity securities - available for sale, at market value, including accrued interest at time of conversion			$ 92,981

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