Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES:
Net income	$ 102,420	$ 317,699
Adjustments to reconcile net income to cash provided by operating activities:
Net realized gains on sales of investments	(52,906)	(113,151)
Mark to market adjustments	(77,318)	(59,269)
Net impairment charges recognized in earnings		168
Stock based compensation	12,112	17,454
Insurance balances receivable	(123,075)	(156,709)
Prepaid reinsurance	(35,982)	(15,497)
Reinsurance recoverable	(86,363)	(12,444)
Accrued investment income	938	6,941
Net deferred acquisition costs	(15,280)	(15,465)
Net deferred tax assets	2,339	8,415
Other assets	15,686	22,318
Reserve for losses and loss expenses	372,116	158,663
Unearned premiums	222,473	141,337
Reinsurance balances payable	32,929	34,953
Accounts payable and accrued liabilities	(18,629)	(23,806)
Other items, net	10,386	(6,005)
Net cash provided by operating activities	361,846	305,602
CASH FLOWS USED IN INVESTING ACTIVITIES:
Purchases of fixed maturity investments - available for sale	(352)	(113,118)
Purchases of fixed maturity investments	352	113,118
Purchases of fixed maturity investments - trading	(3,949,447)	(6,927,637)
Purchases of equity securities	(245,340)	(75,473)
Purchases of other invested assets	(240,410)	(127,538)
Sales of fixed maturity investments - available for sale	560,794	1,827,800
Sales of fixed maturity investments - trading	3,503,758	5,344,007
Sales of equity securities	36,295	2,019
Sales of other invested assets	36,067	1,136
Purchases of fixed assets	(2,316)	(5,213)
Change in restricted cash	29,520	(13,643)
Net cash used in investing activities	(271,431)	(87,660)
CASH FLOWS USED IN FINANCING ACTIVITIES:
Dividends paid		(20,109)
Proceeds from the exercise of stock options	4,824	3,576
Share repurchases	(60,000)	(49,089)
Repurchase of founder warrants	(53,620)
Net cash used in financing activities	(108,796)	(65,622)
Effect of exchange rate changes on foreign currency cash	2,190	(1,819)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(16,191)	150,501
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	756,995	292,188
CASH AND CASH EQUIVALENTS, END OF PERIOD	740,804	442,689
Supplemental disclosure of cash flow information:
Cash paid for income taxes	433	4,386
Cash paid for interest expense	$ 27,000	$ 18,750

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