CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2011	$ 803,435	$ 1,746	$ 322,133	$ (155,801)	$ 565,109	$ 70,248
Beginning Balance (in shares) at Dec. 31, 2011		17,467,615		3,511,380
Net income	22,803				22,803
Changes in comprehensive income:
Change in net unrealized gain (loss) on investments	16,037					16,037
Change in net non-credit other-than-temporary impairment losses	516					516
Change in foreign currency translation gain (loss)	(3,812)					(3,812)
Other comprehensive income (loss)	12,741					12,741
Shares issued under stock plan (in shares)		55,334
Shares issued under stock plan	(357)	6	(363)
Share-based compensation	3,186		3,186
Ending Balance at Jun. 30, 2012	$ 841,808	$ 1,752	$ 324,956	$ (155,801)	$ 587,912	$ 82,989
Ending Balance (in shares) at Jun. 30, 2012		17,522,949		3,511,380