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 (loss)
Beginning Balance at Dec. 31, 2009			$ 1,721	$ 304,505	$ (18,296)	$ 469,934	$ 43,655
Change in net unrealized gains on securities	25,196						15,522
Treasury stock acquired					(46,169)
Net income	36,015					36,015
Share-based compensation				4,044
Change in net non-credit other-than-temporary impairment losses							(1,302)
Issuance related to share-based compensation			3		4,677
Change in net cumulative translation adjustments	434						434
Ending Balance at Jun. 30, 2010	814,743		1,724	308,549	(59,788)	505,949	58,309
Beginning Balance at Dec. 31, 2010	829,354		1,728	312,588	(64,935)	539,512	40,461
Change in net unrealized gains on securities	17,266						16,696
Treasury stock acquired					(41,442)
Net income	1,611					1,611
Share-based compensation				10,586
Change in net non-credit other-than-temporary impairment losses							175
Issuance related to share-based compensation			16
Change in net cumulative translation adjustments	923						923
Ending Balance at Jun. 30, 2011	$ 817,919		$ 1,744	$ 323,174	$ (106,377)	$ 541,123	$ 58,255