Consolidated Statement of Stockholders' Equity - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2015	$ 1,096,148	$ 1,793	$ 357,829	$ (155,801)	$ 868,723	$ 23,604
Beginning balance (in shares) at Dec. 31, 2015	17,942,269	17,942,269		3,511,380
Net income	$ 39,122				39,122
Dividends declared	(1,309)				(1,309)
Changes in comprehensive income:
Change in net unrealized gain (loss) on investments	46,429					46,429
Change in net non-credit other-than-temporary impairment losses	1,237					1,237
Change in foreign currency translation gain (loss)	(5,840)					(5,840)
Other comprehensive income (loss)	41,826					41,826
Shares issued under stock plan	(3,638)	$ 12	(3,650)
Shares issued under stock plan (in shares)		113,549
Share-based compensation	9,409		9,409
Ending balance at Jun. 30, 2016	$ 1,181,558	$ 1,805	$ 363,588	$ (155,801)	$ 906,536	$ 65,430
Ending balance (in shares) at Jun. 30, 2016	18,055,818	18,055,818		3,511,380