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Restructuring (Accrual Detail) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Reserve [Roll Forward]        
Charges $ 476 $ 2,597 $ 2,357 $ 12,627
2015 and 2016 Reorganization Plans        
Restructuring Reserve [Roll Forward]        
Beginning liability balance     6,514  
Charges     3,008  
Cash payments and adjustments     (5,901)  
Ending liability balance 3,621   3,621  
2015 and 2016 Reorganization Plans | Employee Severance and Other Termination Costs        
Restructuring Reserve [Roll Forward]        
Beginning liability balance     3,889  
Charges     2,544  
Cash payments and adjustments     (5,431)  
Ending liability balance 1,002   1,002  
2015 and 2016 Reorganization Plans | Other        
Restructuring Reserve [Roll Forward]        
Beginning liability balance     2,625  
Charges     464  
Cash payments and adjustments     (470)  
Ending liability balance $ 2,619   $ 2,619