CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues
Net premiums written	$ 706,543	$ 624,258	$ 1,470,821	$ 1,392,012
Change in unearned premiums	(63,664)	(1,247)	(194,247)	(99,084)
Net premiums earned	642,879	623,011	1,276,574	1,292,928
Net investment income	86,671	90,537	174,978	183,509
Net realized gains (losses)	45,210	62,114	65,905	109,896
Other-than-temporary impairment losses	(1,969)	(4,718)	(5,227)	(7,054)
Less investment impairments recognized in other comprehensive income, before taxes	285	308	863	1,038
Net impairment losses recognized in earnings	(1,684)	(4,410)	(4,364)	(6,016)
Fee income	784	883	1,599	1,677
Equity in net income (loss) of investment funds accounted for using the equity method	5,973	(348)	35,646	28,702
Other income (loss)	(4,265)	4,528	302	10,506
Total revenues	775,568	776,315	1,550,640	1,621,202
Expenses
Losses and loss adjustment expenses	431,622	363,145	925,502	791,196
Acquisition expenses, net	110,639	107,475	219,393	225,099
Other expenses	110,563	101,533	212,983	208,339
Interest expense	7,758	7,916	15,479	15,176
Net foreign exchange (gains) losses	18,375	(48,625)	55,287	(87,226)
Total expenses	678,957	531,444	1,428,644	1,152,584
Income before income taxes	96,611	244,871	121,996	468,618
Income tax benefit (expense)	(1,731)	1,420	(2,102)	8,173
Net income	98,342	243,451	124,098	460,445
Preferred dividends	6,461	6,461	12,922	12,922
Net income available to common shareholders	$ 91,881	$ 236,990	$ 111,176	$ 447,523
Net income per common share
Basic	$ 0.70	$ 1.55	$ 0.84	$ 2.87
Diluted	$ 0.67	$ 1.48	$ 0.80	$ 2.74
Weighted average common shares and common share equivalents outstanding
Basic	131,232,269	152,962,620	132,359,493	156,022,848
Diluted	137,975,599	159,795,909	139,234,931	163,160,070