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Restructuring Charges (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve      
Restructuring Reserve, Beginning $ 7,972 $ 10,620  
Restructuring Charges 15,760 18,420 $ 12,772
Payments for Restructuring (16,483) (20,820)  
Restructuring Reserve, Translation Adjustment (548) (248)  
Restructuring Reserve, Ending $ 6,701 $ 7,972 $ 10,620