Accumulated Other Comprehensive Income - Schedules of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 335,338	$ 347,702
Ending Balance	370,638	335,338
Scenario, Previously Reported
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(394)
Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	346	471
Other comprehensive income (loss) before reclassifications	135	(55)
Amounts reclassified from AOCI, net of tax	(60)	(70)
Net other comprehensive income (loss)	75	(125)
Ending Balance	421	346
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(23,257)	12,415
Other comprehensive income (loss) before reclassifications	(5,827)	(35,672)
Amounts reclassified from AOCI, net of tax	0	0
Net other comprehensive income (loss)	(5,827)	(35,672)
Ending Balance	(29,084)	(23,257)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(11,265)	(13,280)
Other comprehensive income (loss) before reclassifications	0	1,546
Amounts reclassified from AOCI, net of tax	537	469
Net other comprehensive income (loss)	537	2,015
Ending Balance	(10,728)	(11,265)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(34,176)	(589)
Other comprehensive income (loss) before reclassifications	(5,692)	(34,181)
Amounts reclassified from AOCI, net of tax	477	399
Net other comprehensive income (loss)	(5,215)	(33,782)
Ending Balance	$ (39,391)	$ (34,176)