Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Company's accrual for restructuring activities:-
Beginning Restructuring Accrual Balance, as of December 31, 2015	$ 10,620
Restructuring Charges	4,413	$ 1,432
Restructuring Cash Payments	(5,242)
Impact of foreign currency on restructuring reserve	231
Ending Restructuring Accrual Balance, as of March 31, 2016	$ 10,022