Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 335,338
Ending Balance	381,329
Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	346
Other comprehensive income before reclassifications	104
Amounts reclassified from AOCI, net of tax	(42)
Net other comprehensive income	62
Ending Balance	408
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(23,257)
Other comprehensive income before reclassifications	723
Net other comprehensive income	723
Ending Balance	(22,534)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(11,265)
Amounts reclassified from AOCI, net of tax	100
Net other comprehensive income	100
Ending Balance	(11,165)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(34,176)
Other comprehensive income before reclassifications	827
Amounts reclassified from AOCI, net of tax	58
Net other comprehensive income	885
Ending Balance	$ (33,291)