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Restructuring Charges (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve      
Restructuring Reserve, Beginning $ 9,531 $ 12,211  
Restructuring Charges 12,772 6,235 $ 11,148
Payments for Restructuring (12,663) (8,376)  
Restructuring Reserve, Translation Adjustment 980 (539)  
Restructuring Reserve, Ending $ 10,620 $ 9,531 $ 12,211