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Restructuring Charges, 2016 Restructuring (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Restructuring Charges.    
Restructuring charges recognized $ 4,355  
Liability balance at end of the period 637 $ 1,254
Restructuring Plan 2016    
Restructuring Charges.    
Restructuring charges recognized 4,355  
Cash payments (2,046)  
Acceleration of share-based compensation (1,978)  
Asset write-offs/translation gain (157)  
Liability balance at end of the period 174  
Employee separation and related costs | Restructuring Plan 2016    
Restructuring Charges.    
Restructuring charges recognized 4,192  
Cash payments (2,046)  
Acceleration of share-based compensation (1,978)  
Asset write-offs/translation gain (5)  
Liability balance at end of the period 163  
Contract termination charges | Restructuring Plan 2016    
Restructuring Charges.    
Restructuring charges recognized 136  
Asset write-offs/translation gain (125)  
Liability balance at end of the period 11  
Assets write-offs | Restructuring Plan 2016    
Restructuring Charges.    
Restructuring charges recognized 27  
Asset write-offs/translation gain $ (27)