Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2015	$ (34,176)
Other comprehensive income before reclassifications	8,053
Amounts reclassified from AOCI, net of tax	61
Net other comprehensive income (loss)	8,114
Balance at March 31, 2016	(26,062)
Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2015	346
Other comprehensive income before reclassifications	11
Amounts reclassified from AOCI, net of tax	(12)
Net other comprehensive income (loss)	(1)
Balance at March 31, 2016	345
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2015	(23,257)
Other comprehensive income before reclassifications	8,042
Net other comprehensive income (loss)	8,042
Balance at March 31, 2016	(15,215)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2015	(11,265)
Amounts reclassified from AOCI, net of tax	73
Net other comprehensive income (loss)	73
Balance at March 31, 2016	$ (11,192)