CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (USD $) In Thousands	Total	Non-Cumulative Preferred Shares	Common Shares	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Shares Held in Treasury, at Cost
Balance as of at Dec. 31, 2009		$ 325,000	$ 548	$ 253,466	$ 3,605,809	$ 138,526	$ 0
Common shares issued, net			11	3,289
Purchases of common shares under share repurchase program			(30)
Exercise of stock options				24,664
Common shares retired				(217,562)
Amortization of share-based compensation				19,376
Other				595
Dividends, Preferred Stock	12,922				(12,922)
Net income	460,445				460,445
Change in unrealized appreciation (decline) in value of investments, net of deferred income tax						43,716
Portion of other than temporary impairment losses recognized in other comprehensive income, net of deferred income tax	(1,038)					(1,038)
Foreign currency translation adjustments, net of deferred income tax	(7,973)					(7,973)
Shares repurchased for treasury							(237,917)
Balance as of at Jun. 30, 2010			529	83,828	4,053,332	173,231	(237,917)
Balance as of at Dec. 31, 2010	4,513,003	325,000	534	110,325	4,422,553	204,503	(549,912)
Common shares issued, net			7	3,912
Purchases of common shares under share repurchase program			0
Exercise of stock options				6,372
Common shares retired				0
Amortization of share-based compensation				19,505
Other				1,887
Dividends, Preferred Stock	12,922				(12,922)
Net income	124,098				124,098
Change in unrealized appreciation (decline) in value of investments, net of deferred income tax						57,374
Portion of other than temporary impairment losses recognized in other comprehensive income, net of deferred income tax	(863)					(863)
Foreign currency translation adjustments, net of deferred income tax	2,570					2,570
Shares repurchased for treasury							(273,674)
Balance as of at Jun. 30, 2011	$ 4,441,269		$ 541	$ 142,001	$ 4,533,729	$ 263,584	$ (823,586)