Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended						6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Mar. 31, 2011		Jun. 30, 2012
REVENUES:
Net premiums written	$ 1,190,991		$ 1,057,415		$ 2,140,718		$ 2,394,517
Change in net unearned premiums	(43,634)		(40,171)		(140,977)		(147,509)
Net premiums earned	1,147,357		1,017,244		1,999,741		2,247,008
Net investment income	161,250		149,072		295,198		318,869
Insurance service fees	27,036		25,035		47,208		50,913
Net investment gains:
Net realized gains on investment sales	24,286		23,290		52,574		67,763
Change in valuation allowance, net of other-than-temporary impairments	0	[1]	(400)	[1]	(400)	[1]	4,014	[1]
Net investment gains	24,286		22,890		52,174		71,777
Revenues from wholly-owned investees	55,434		56,134		110,021		105,109
Other income	384		574		958		776
Total revenues	1,415,747		1,270,949		2,505,300		2,794,452
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	731,202		674,276		1,281,371		1,410,674
Other operating costs and expenses	448,758		403,658		789,787		880,537
Expenses from wholly-owned investees	54,931		55,855		109,671		106,261
Interest expense	32,417		28,132		56,249		61,238
Total operating costs and expenses	1,267,308		1,161,921		2,237,078		2,458,710
Income before income taxes	148,439		109,028		268,222		335,742
Income tax expense	(39,535)		(26,908)		(70,507)		(91,606)
Net income before noncontrolling interests	108,904		82,120		197,715		244,136
Noncontrolling interests	(66)		64		59		20
Net income to common stockholders	$ 108,838		$ 82,184		$ 197,774		$ 244,156
NET INCOME PER SHARE:
Basic	$ 0.79		$ 0.58		$ 1.4		$ 1.77
Diluted	$ 0.76		$ 0.56		$ 1.34		$ 1.7

[1] For the six months ended June 30, 2012, this represents a valuation allowance reduction of $7 million, partially offset by an other-than-temporary impairment of $3 million