Consolidated Statements of Earnings and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Revenues
Net premiums earned	$ 1,095,932		$ 183,878		$ 1,530,139		$ 364,858
Net investment income	90,860		28,545		144,054		60,124
Net realized capital gains	39,452		6,490		107,441		41,182
Other than temporary impairment losses	(1,129)				(2,907)
Gain on bargain purchase					494,940
Other income	9,276		248		9,591		1,133
Total revenues	1,234,391		219,161		2,283,258		467,297
Costs and Expenses
Net loss and loss adjustment expenses	680,885		122,619		914,831		193,641
Commissions, brokerage and other underwriting expenses	239,193		64,132		339,053		130,660
Other operating expenses	34,826		7,834		50,478		17,241
Corporate administration	11,094		5,002		58,387		11,381
Amortization of intangible assets	108,098		839		140,037		1,678
Interest expense	15,743		4,268		24,820		8,720
Total costs and expenses	1,089,839		204,694		1,527,606		363,321
Earnings before income taxes	144,552		14,467		755,652		103,976
Income taxes	35,243		(615)		86,240		17,554
Net earnings	109,309		15,082		669,412		86,422
Other comprehensive income:
Change in unrealized gains (losses), net of deferred taxes of $14,257 and $(13,154) for 3 months and $34,402 and $40,295 for 6 months ended June 30, 2012 and 2011 respectively	26,477		(24,428)		63,889		74,834
Less: reclassification for net realized capital gains and other than temporary impairment losses, net of taxes of $(13,413) and $(2,271) for 3 months and $(35,587) and $(14,414) for 6 months ended June 30, 2012 and 2011 respectively	(24,910)		(4,218)		(67,947)		(26,768)
Change in unrealized currency translation adjustment, net of deferred taxes of $(8,012) and $0 for 3 months and $(6,282) and $0 for 6 months ended June 30, 2012 and 2011 respectively	(14,880)				(11,667)
Retirement plans	(14)		(50)		(774)		(179)
Comprehensive income	$ 95,982		$ (13,614)		$ 652,913		$ 134,309
Basic earnings per share	$ 6.46	[1]	$ 1.69	[1]	$ 48.03	[1]	$ 9.69	[1]
Diluted earnings per share	$ 6.45	[1]	$ 1.68	[1]	$ 47.96	[1]	$ 9.66	[1]

[1] 2011 amounts reflect subsequent common stock dividends.