Summary of Significant Accounting Policies - The Balances in the Company's Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 97,703
Ending balance	100,870
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(37,447)	$ (9,825)
Other comprehensive income (loss) before reclassifications	6,832	(10,394)
Amounts reclassified from accumulated other comprehensive income, net of tax		(10,491)
Net current-period other comprehensive income (loss)	6,832	(20,885)
Ending balance	(30,615)	(30,710)
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,663)	(1,863)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income, net of tax		0
Net current-period other comprehensive income (loss)	0	0
Ending balance	(1,663)	(1,863)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(39,110)	(11,688)
Other comprehensive income (loss) before reclassifications	6,832	(10,394)
Amounts reclassified from accumulated other comprehensive income, net of tax		(10,491)
Net current-period other comprehensive income (loss)	6,832	(20,885)
Ending balance	$ (32,278)	$ (32,573)