CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Preferred Stock	Common stock	Additional paid-in capital	Treasury stock, at cost	Retained earnings	Accumulated other comprehensive income, net of tax
Beginning Balance at Dec. 31, 2008		$ 0	$ 1,708	$ 298,872	$ (11,540)	$ 406,776	$ (6,499)
Change in net unrealized gains on securities	33,910						46,020
Treasury stock acquired					(6,756)
Net income (loss)	63,158					63,158
Share-based compensation				5,633
Change in net non-credit other-than-temporary impairment losses							4,000
Issuance related to share-based compensation			13
Change in net cumulative translation adjustments	134						134
Ending Balance at Dec. 31, 2009	801,519	0	1,721	304,505	(18,296)	469,934	43,655
Change in net unrealized gains on securities	12,339						(660)
Treasury stock acquired					(51,980)
Net income (loss)	69,578					69,578
Share-based compensation				8,083
Change in net non-credit other-than-temporary impairment losses							(2,824)
Issuance related to share-based compensation			7		5,341
Change in net cumulative translation adjustments	290						290
Ending Balance at Dec. 31, 2010	829,354	0	1,728	312,588	(64,935)	539,512	40,461
Change in net unrealized gains on securities	34,348						29,469
Treasury stock acquired					(90,866)
Net income (loss)	25,597					25,597
Share-based compensation				9,545
Change in net non-credit other-than-temporary impairment losses							(83)
Issuance related to share-based compensation			18
Change in net cumulative translation adjustments	401						401
Ending Balance at Dec. 31, 2011	$ 803,435	$ 0	$ 1,746	$ 322,133	$ (155,801)	$ 565,109	$ 70,248