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Restructuring Charges (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Company's accrual for restructuring activities:-        
Beginning Restructuring Accrual Balance, as of December 31, 2016     $ 10,620  
Restructuring Charges $ 2,222 $ 3,385 13,956 $ 8,840
Restructuring Cash Payments     (16,701)  
Impact of foreign currency on restructuring reserve     (61)  
Ending Restructuring Accrual Balance, as of June 30, 2017 $ 7,814   $ 7,814