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Restructuring Charges, 2016 Restructuring (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Restructuring Charges.        
Restructuring charges recognized $ 5,265 $ 4,355 $ 9,620  
Liability balance at end of the period 3,157   3,157 $ 1,254
Restructuring Plan 2016        
Restructuring Charges.        
Restructuring charges recognized     9,620  
Cash payments     (3,065)  
Acceleration of share-based compensation     (3,364)  
Asset write-offs/translation gain     (34)  
Liability balance at end of the period 3,157   3,157  
Employee separation and related costs        
Restructuring Charges.        
Restructuring charges recognized 5,300      
Employee separation and related costs | Restructuring Plan 2016        
Restructuring Charges.        
Restructuring charges recognized     9,417  
Cash payments     (2,889)  
Acceleration of share-based compensation     (3,364)  
Asset write-offs/translation gain     (7)  
Liability balance at end of the period $ 3,157   3,157  
Contract termination charges | Restructuring Plan 2016        
Restructuring Charges.        
Restructuring charges recognized     176  
Cash payments     (176)  
Assets write-offs | Restructuring Plan 2016        
Restructuring Charges.        
Restructuring charges recognized     27  
Asset write-offs/translation gain     $ (27)