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Restructuring Charges (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve      
Restructuring Reserve, Beginning $ 12,211 $ 8,436  
Restructuring Charges 6,235 11,148 $ 5,915
Payments for Restructuring (8,376) (6,568)  
Restructuring Reserve, Translation Adjustment (539) (805)  
Restructuring Reserve, Ending $ 9,531 $ 12,211 $ 8,436