CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Net premiums written	$ 996,648	$ 947,589	$ 2,040,472	$ 1,973,888
(Increase) decrease in net unearned premiums	(41,719)	26,163	(128,714)	(7,541)
Net premiums earned	954,929	973,752	1,911,758	1,966,347
Net investment income	119,508	115,774	226,348	228,384
Realized net capital (losses) gains:
Total other-than-temporary impairments	(1,639)		(3,139)	(13,045)
Less: other-than-temporary impairments recognized in other comprehensive income (loss)				6,713
Other-than-temporary impairments charged to earnings	(1,639)		(3,139)	(6,332)
Other realized net capital gains	873	8,277	57,785	12,720
Total realized net capital (losses) gains	(766)	8,277	54,646	6,388
Loss on early extinguishment of debt			(1,179)
Total revenues	1,073,671	1,097,803	2,191,573	2,201,119
Expenses:
Net losses and loss adjustment expenses	681,126	651,543	1,850,178	1,437,867
Net commissions	240,201	238,829	481,202	473,341
(Increase) decrease in deferred policy acquisition costs	(11,260)	8,115	(43,420)	2,615
Other underwriting expenses	40,601	44,699	77,326	88,828
Interest on senior notes	16,693	17,056	33,587	34,142
Other expenses, net	11,573	6,966	18,725	14,651
Total expenses	978,934	967,208	2,417,598	2,051,444
Income (loss) before income taxes	94,737	130,595	(226,025)	149,675
Income taxes (benefits)	13,855	20,085	(116,755)	23,290
Net income (loss)	$ 80,882	$ 110,510	$ (109,270)	$ 126,385
Net income (loss) per common share:
Basic (in dollars per share)	$ 1.29	$ 1.72	$ (1.75)	$ 1.94
Diluted (in dollars per share)	$ 1.28	$ 1.70	$ (1.75)	$ 1.92
Cash dividends declared per common share (in dollars per share)	$ 0.22	$ 0.21	$ 0.43	$ 0.41
Weighted average common shares outstanding:
Basic (in shares)	62,496	64,098	62,430	65,085
Diluted (in shares)	63,340	64,825	62,430	65,785