Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Available-for-sale securities at fair value:
Equity securities (cost: 2012 - $1,457,758; 2011 - $775,741)	$ 1,504,601		$ 870,950
Debt securities (amortized cost: 2012 - $15,908,901; 2011 - $2,538,872)	16,336,461		2,679,528
Short-term investments	235,096		1,096,517
Marketable Securities, Total	18,076,158		4,646,995
Other invested assets	383,706		179,815
Total investments	18,459,864		4,826,810
Cash	571,313		84,749
Accrued investment income	164,740		28,879
Premium balances receivable	676,076		147,006
Reinsurance recoverables	1,271,555	[1]	852,845
Ceded unearned premiums	171,284		142,946
Deferred acquisition costs	285,604		70,537
Property and equipment at cost, net of accumulated depreciation and amortization	31,098		17,906
Goodwill	82,495		48,095
Intangible assets, net of amortization	165,669		90,863
Current taxes receivable	67,779
Net deferred tax assets	449,326		80,975
Other assets	360,839		86,478
Identifiable assets	22,757,642		6,478,089
Liabilities and Stockholders' Equity
Loss and loss adjustment expenses	11,830,765		2,313,035
Unearned premiums	1,808,766		549,740
Senior Notes	1,815,660		299,035
Reinsurance payable	90,768		45,462
Current taxes payable			16,247
Other liabilities	630,614		328,893
Total liabilities	16,176,573		3,552,412
Common stock (shares authorized: 2012 and 2011 - 22,000,000; issued 2012 - 17,478,746; 2011 - 9,117,787)	17,479		9,118
Contributed capital	3,626,742		938,037
Accumulated other comprehensive income	314,018		155,532
Treasury stock, at cost (2012 - 546,418 shares; 2011 - 566,141 shares)	(161,490)		(167,319)
Retained earnings	2,784,320		1,990,309
Total stockholders' equity	6,581,069		2,925,677
Liabilities and Equity, Total	$ 22,757,642		$ 6,478,089

[1] Reinsurance recoverables reflect amounts due from one or more reinsurance subsidiaries of the listed company.