Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES:
Net income	$ 82,184	$ 359,750
Adjustments to reconcile net income to cash provided by operating activities:
Net realized gains on sales of investments	(41,185)	(118,640)
Mark to market adjustments	112,421	(5,634)
Stock compensation expense	11,805	10,822
Undistributed loss of equity method investments	19,244	10,452
Changes in:
Reserve for losses and loss expenses, net of reinsurance recoverables	188,835	171,229
Unearned premiums, net of prepaid reinsurance	113,380	285,012
Insurance balances receivable	(123,175)	(256,993)
Funds held	280,351	226,727
Reinsurance balances payable	40,354	30,405
Reinsurance recoverable on paid losses	(31,035)	(3,634)
Net deferred acquisition costs	(10,901)	(45,166)
Net deferred tax assets	(10,141)	(3,511)
Accounts payable and accrued liabilities	(39,046)	4,473
Other items, net	(1,705)	4,441
Net cash provided by operating activities	591,386	669,733
CASH FLOWS USED IN INVESTING ACTIVITIES:
Purchases of trading securities	(3,962,283)	(5,608,594)
Purchases of other invested assets	(110,851)	(242,227)
Sales of trading securities	3,888,416	5,500,176
Sales of other invested assets	160,253	243,123
Purchases of fixed assets	(23,798)	(14,490)
Change in restricted cash	(78,892)	(29,565)
Net cash paid for acquisitions	(141,503)	(2,565)
Net cash used in investing activities	(268,658)	(154,142)
CASH FLOWS USED IN FINANCING ACTIVITIES:
Dividends paid	(66,784)	(55,064)
Proceeds from the exercise of stock options	9,184	7,640
Share repurchases	(246,443)	(166,207)
Proceeds from other long-term debt	4,003	0
Repayment of other long-term debt	(154)	0
Net cash used in financing activities	(300,194)	(213,631)
Effect of exchange rate changes on foreign currency cash	(8,063)	(2,626)
NET INCREASE IN CASH AND CASH EQUIVALENTS	14,471	299,334
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	589,339	531,936
CASH AND CASH EQUIVALENTS, END OF PERIOD	603,810	831,270
Supplemental disclosure of cash flow information:
Cash paid for income taxes	2,213	18,052
Cash paid for interest expense	$ 45,750	$ 45,750