Consolidated Statements of Earnings and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Revenues
Net premiums earned	$ 3,733,005		$ 747,639		$ 768,134
Net investment income	312,998		108,910		125,012
Net realized capital gains	157,879		127,141		97,374
Other than temporary impairment losses	(2,907)		(3,607)		(12,356)
Gain on bargain purchase	494,940
Other income	57,297		1,754		7,188
Total revenues	4,753,212		981,837		985,352
Costs and Expenses
Net loss and loss adjustment expenses	2,630,170		429,986		377,937
Commissions, brokerage and other underwriting expenses	882,502	[1]	268,125	[1]	259,335	[1]
Other operating expenses	123,700		31,101		33,803
Corporate administration	75,842		41,007		28,854
Amortization of intangible assets	253,298		3,355		3,354
Interest expense	68,424		17,426		4,698
Total costs and expenses	4,033,936		791,000		707,981
Earnings before income taxes	719,276		190,837		277,371
Income taxes	17,032		47,586		78,869
Net earnings	702,244		143,251		198,502
Other comprehensive income:
Change in unrealized gains (losses), net of deferred taxes of $112,301, $37,139 and $66,873 for 2012, 2011 and 2010, respectively	208,560		68,973		124,192
Less: reclassification for net realized capital gains and other than temporary impairment losses, net of taxes of $54,240, $43,237 and $29,756 for 2012, 2011 and 2010, respectively	(100,732)		(80,297)		(55,262)
Change in unrealized currency translation adjustment, net of deferred taxes of $7,200, $0 and $0 for 2012, 2011 and 2010, respectively	(13,371)
Retirement plans	520		(3,407)		7,287
Comprehensive income	$ 797,221		$ 128,520		$ 274,719
Basic earnings per share	$ 45.48	[2]	$ 16.26	[2]	$ 21.85	[2]
Diluted earnings per share	$ 45.48	[2]	$ 16.20	[2]	$ 21.85	[2]

[1] Includes amortization associated with deferred acquisition costs of $578.1 million, $141.4 million and $143.8 million for the years ended December 31, 2012, 2011 and 2010, respectively.

[2] Amounts reflect subsequent common stock dividends