Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
REVENUES:
Net premiums written	$ 1,275,887		$ 1,126,139		$ 3,670,404		$ 3,266,857
Change in net unearned premiums	(89,354)		(70,316)		(236,863)		(211,293)
Net premiums earned	1,186,533		1,055,823		3,433,541		3,055,564
Net investment income	116,019		114,063		434,888		409,261
Insurance service fees	26,208		22,279		77,121		69,487
Net investment gains:
Net realized gains on investment sales	17,226		21,238		84,989		73,812
Change in valuation allowance, net of other-than-temporary impairments	5,000	[1]	0	[1]	9,014	[1]	(400)	[1]
Net investment gains	22,226		21,238		94,003		73,412
Revenues from wholly-owned investees	68,087		65,922		173,196		175,943
Other income	1,428		406		2,204		1,364
Total revenues	1,420,501		1,279,731		4,214,953		3,785,031
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	736,632		683,980		2,147,306		1,965,351
Other operating costs and expenses	451,487		407,149		1,332,024		1,196,936
Expenses from wholly-owned investees	66,177		64,388		172,438		174,059
Interest expense	32,512		28,068		93,750		84,317
Total operating costs and expenses	1,286,808		1,183,585		3,745,518		3,420,663
Income before income taxes	133,693		96,146		469,435		364,368
Income tax expense	(32,685)		(19,775)		(124,291)		(90,282)
Net income before noncontrolling interests	101,008		76,371		345,144		274,086
Noncontrolling interests	(61)		39		(41)		98
Net income to common stockholders	$ 100,947		$ 76,410		$ 345,103		$ 274,184
NET INCOME PER SHARE:
Basic	$ 0.74		$ 0.55		$ 2.51		$ 1.95
Diluted	$ 0.71		$ 0.53		$ 2.41		$ 1.87

[1] For the nine months ended September 30, 2012, this represents a change in valuation allowance of $14 million, partially offset by an other-than-temporary impairment of $5 million