CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Net premiums written	$ 691,381	$ 636,117	$ 2,162,202	$ 2,028,129
Change in unearned premiums	(9,332)	(8,708)	(203,579)	(107,792)
Net premiums earned	682,049	627,409	1,958,623	1,920,337
Net investment income	82,753	90,768	257,731	274,277
Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments	30,199	68,828	96,104	178,724
Other-than-temporary impairment losses	(5,180)	(2,679)	(10,406)	(9,732)
Less investment impairments recognized in other comprehensive income, before taxes	2,441	604	3,303	1,641
Net impairment losses recognized in earnings	(2,739)	(2,075)	(7,103)	(8,091)
Fee income	848	874	2,447	2,551
Equity in net income (loss) of investment funds accounted for using the equity method	(30,549)	9,708	5,097	38,410
Other income	2,432	1,840	2,734	12,346
Total revenues	764,993	797,352	2,315,633	2,418,554
Expenses
Losses and loss adjustment expenses	423,984	359,193	1,349,486	1,150,389
Acquisition expenses, net	120,205	111,279	339,598	336,378
Other expenses	105,998	103,121	318,981	311,460
Interest expense	8,125	7,371	23,604	22,547
Net foreign exchange (gains) losses	(60,040)	65,157	(4,753)	(22,069)
Total expenses	598,272	646,121	2,026,916	1,798,705
Income before income taxes	166,721	151,231	288,717	619,849
Income tax (benefit) expense	(2,267)	3,200	(4,369)	11,373
Net income	168,988	148,031	293,086	608,476
Preferred dividends	6,461	6,461	19,383	19,383
Net income available to common shareholders	$ 162,527	$ 141,570	$ 273,703	$ 589,093
Net income per common share
Basic	$ 1.24	$ 0.96	$ 2.07	$ 3.85
Diluted	$ 1.19	$ 0.92	$ 1.98	$ 3.68
Weighted average common shares and common share equivalents outstanding
Basic	131,560,851	146,993,373	132,090,354	152,979,948
Diluted	137,140,929	153,546,027	138,542,558	159,951,594