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Restructuring (Schedule of Restructuring Reserve by Type of Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Reserve [Roll Forward]        
Balance at December 31, 2016     $ 12,311  
Charges $ 1,264 $ 19,312 3,887 $ 19,666
Cash payments     (13,591)  
Non-cash adjustments     (1,258)  
Currency translation     12  
Balance at September 30, 2017 1,361   1,361  
Employee Severance [Member]        
Restructuring Reserve [Roll Forward]        
Balance at December 31, 2016     12,106  
Charges     2,626  
Cash payments     (13,440)  
Non-cash adjustments     2  
Currency translation     1  
Balance at September 30, 2017 1,295   1,295  
Other Restructuring [Member]        
Restructuring Reserve [Roll Forward]        
Balance at December 31, 2016     205  
Charges     1,261  
Cash payments     (151)  
Non-cash adjustments     (1,260)  
Currency translation     11  
Balance at September 30, 2017 $ 66   $ 66