UNAUDITED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Net premiums earned	$ 1,562,393	$ 1,486,593	$ 3,092,084	$ 2,923,010
Net investment income	232,546	262,631	479,014	527,873
Realized investment gains (losses):
Net realized gains (losses) on investments sold	43,357	15,800	84,504	57,567
Other-than-temporary impairments on investments	(1,561)	(16,168)	(5,289)	(34,733)
Other-than-temporary impairments on investments transferred to (from) other comprehensive income	(828)	(12,025)	(1,738)	(14,425)
Net realized gains (losses) on investments	40,968	(12,393)	77,477	8,409
Net realized and unrealized gains (losses) on derivative instruments	(5,105)	(4,301)	2,780	(3,598)
Income (loss) from investment fund affiliates	46,543	3,097	78,764	22,506
Fee income and other	10,871	13,213	20,503	23,072
Total revenues	1,888,216	1,748,840	3,750,622	3,501,272
Expenses:
Net losses and loss expenses incurred	937,606	826,354	1,780,690	1,680,420
Claims and policy benefits	116,767	131,149	227,720	252,455
Acquisition costs	231,886	218,937	452,145	443,087
Operating expenses	303,159	299,053	586,992	581,465
Exchange (gains) losses	(11,331)	(17,976)	(44,766)	(5,258)
Interest expense	38,204	57,359	76,904	96,657
Total expenses	1,616,291	1,514,876	3,079,685	3,048,826
Income (loss) before income tax and income (loss) from operating affiliates	271,925	233,964	670,937	452,446
Income (loss) from operating affiliates	32,825	20,457	63,823	36,710
Provision (benefit) for income tax	28,872	29,812	72,351	51,362
Net income (loss)	275,878	224,609	662,409	437,794
Non-controlling interests	(3,180)	(3,455)	(38,922)	(40,012)
Net income (loss) attributable to ordinary shareholders	$ 272,698	$ 221,154	$ 623,487	$ 397,782
Weighted average ordinary shares and ordinary share equivalents outstanding - basic (in shares)	289,513	309,765	292,277	312,442
Weighted average ordinary shares and ordinary share equivalents outstanding - diluted (in shares)	294,333	312,435	297,044	315,010
Earnings (loss) per ordinary share and ordinary share equivalent - basic (in dollars per share)	$ 0.94	$ 0.71	$ 2.13	$ 1.27
Earnings (loss) per ordinary share and ordinary share equivalent - diluted (in dollars per share)	$ 0.93	$ 0.71	$ 2.10	$ 1.26