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	51,784						40,844
Treasury stock acquired					(50,272)
Net income (loss)	52,240					52,240
Change in net non-credit other-than-temporary impairment losses							(2,520)
Issuance related to share-based compensation			5	2,024	5,341
Change in net cumulative translation adjustments	128						128
Share-based compensation				4,704
Ending Balance at Sep. 30, 2010	854,013		1,726	311,233	(63,227)	522,174	82,107
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	15,986						16,717
Treasury stock acquired					(73,676)
Net income (loss)	15,509					15,509
Change in net non-credit other-than-temporary impairment losses							(357)
Issuance related to share-based compensation			17	9,415
Change in net cumulative translation adjustments	222						222
Share-based compensation				2,254
Ending Balance at Sep. 30, 2011	$ 799,455		$ 1,745	$ 324,257	$ (138,611)	$ 555,021	$ 57,043