CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Cash flows provided by (used in) operating activities:
Net income (loss)	$ 213,185		$ (193,948)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net realized (gains) losses on investments	(20,803)		66,437
Net realized and unrealized (gains) losses on derivative instruments	(702)		(3,567)
Amortization of premiums (discounts) on fixed maturities	36,678		19,861
(Income) loss from investment and operating affiliates	(35,661)	[1]	(40,786)	[1]
Share based compensation	11,172		12,156
Depreciation	13,859		11,969
Accretion of deposit liabilities	16,446		16,887
Unpaid losses and loss expenses	(444,959)		29,810
Future policy benefit reserves	(37,565)		(24,989)
Unearned premiums	655,416		524,331
Premiums receivable	(573,122)		(476,200)
Unpaid losses and loss expenses recoverable	245,960		112,365
Ceded unearned premiums	(47,201)		(84,247)
Reinsurance balances receivable	(38,319)		(5,617)
Deferred acquisition costs	(81,792)		(62,634)
Reinsurance balances payable	243,696		220,048
Deferred tax asset - net	9,243		(42,956)
Derivatives	(17,908)		53,240
Other assets	42,434		(3,841)
Other liabilities	(45,522)		(103,843)
Other	8,835		38,859
Total adjustments	(59,815)		257,283
Net cash provided by (used in) operating activities	153,370		63,335
Cash flows provided by (used in) investing activities:
Proceeds from sale of fixed maturities and short-term investments	1,499,832		1,122,182
Proceeds from redemption of fixed maturities and short-term investments	1,246,431		689,130
Proceeds from sale of equity securities	7,635		70,349
Purchases of fixed maturities and short-term investments	(3,385,981)		(1,188,395)
Purchases of equity securities	(119,052)		(248,446)
Net dispositions of investment affiliates	34,358		51,170
Other investments, net	(45,333)		4,103
Net cash provided by (used in) investing activities	(762,110)		500,093
Cash flows provided by (used in) financing activities:
Proceeds from issuance of ordinary shares and exercise of stock options	942		0
Buybacks of ordinary shares	(100,490)		(166,502)
Dividends paid on ordinary shares	(1,218)		(34,021)
Distributions to non-controlling interests	(3,985)		(2,287)
Repayment of debt	(600,000)		0
Deposit liabilities	(30,437)		(26,648)
Net cash provided by (used in) financing activities	(735,188)		(229,458)
Effects of exchange rate changes on foreign currency cash	25,121		28,967
Increase (decrease) in cash and cash equivalents	(1,318,807)		362,937
Cash and cash equivalents - beginning of period	3,825,125		3,022,868
Cash and cash equivalents - end of period	$ 2,506,318		$ 3,385,805

[1] The Company records the income related to the alternative funds and to the private investment and operating fund affiliates on a one month and three month lag, respectively.