CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Net premiums earned	$ 839,992	$ 758,873	$ 2,468,207	$ 2,190,092
Net investment income	49,396	111,800	260,068	299,004
Other insurance related income	1,156	884	2,047	1,727
Net realized investment gains:
Other-than-temporary impairment (OTTI) losses	(9,643)	(2,091)	(13,271)	(16,581)
Non-credit portion of OTTI losses during the period	370	(272)	585	1,284
Other realized investment gains	66,830	78,894	137,863	132,622
Total net realized investment gains	57,557	76,531	125,177	117,325
Total revenues	948,101	948,088	2,855,499	2,608,148
Expenses
Net losses and loss expenses	506,839	422,154	2,091,598	1,293,787
Acquisition costs	146,836	123,788	430,097	364,614
General and administrative expenses	114,537	103,435	349,162	309,266
Foreign exchange losses (gains)	(60,830)	24,961	(27,254)	(10,415)
Interest expense and financing costs	15,677	15,800	46,982	40,185
Total expenses	723,059	690,138	2,890,585	1,997,437
Income (loss) before income taxes	225,042	257,950	(35,086)	610,711
Income tax expense	3,765	9,890	7,892	27,550
Net income (loss)	221,277	248,060	(42,978)	583,161
Preferred share dividends	9,219	9,218	27,656	27,656
Net income (loss) available to common shareholders	$ 212,058	$ 238,842	$ (70,634)	$ 555,505
Net income (loss) per common share:
Basic net income (loss)	$ 1.68	$ 1.99	$ (0.58)	$ 4.50
Diluted net income (loss)	$ 1.66	$ 1.78	$ (0.58)	$ 4.04
Weighted average number of common shares outstanding:
Weighted average number of common shares outstanding - basic	125,971	120,091	121,197	123,320
Weighted average number of common shares outstanding - diluted	128,002	134,406	121,197	137,382
Cash dividends declared per common share	$ 0.23	$ 0.21	$ 0.69	$ 0.63