Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, beginning of period at Dec. 31, 2014		$ 522	$ 353,337	$ 795,740	$ 95,527
Repurchases of common stock		(9)	(44,781)
Share-based compensation			15,307
Net issuance of common stock		3	(3)
Adjustments to paid-in capital, other			136
Net income	$ 43,401			43,401
Dividends				(8,517)
Change in foreign currency translation adjustment, net of income tax expense (benefit)					(20,336)
Change in net unrealized investment gains (losses) not-other-than temporarily impaired, net of income tax expense (benefit)					9,094
Balance, end of period at Mar. 31, 2015	1,239,421	516	323,996	830,624	84,285
Balance, beginning of period at Dec. 31, 2015	1,145,772	483	180,250	952,804	12,235
Repurchases of common stock		(12)	(52,973)
Share-based compensation			10,580
Net issuance of common stock		2	(2)
Net income	45,176			45,176
Dividends				(8,295)
Change in foreign currency translation adjustment, net of income tax expense (benefit)					15,868
Change in net unrealized investment gains (losses) not-other-than temporarily impaired, net of income tax expense (benefit)					16,640
Change in net unrealized investment losses other-than-temporarily impaired, net of income tax expense (benefit)					2
Balance, end of period at Mar. 31, 2016	$ 1,172,758	$ 473	$ 137,855	$ 989,685	$ 44,745