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Restructuring (Accrual Detail) (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]        
Charges $ 792 $ 4,381 $ 12,060 $ 37,219
2015 and 2016 Reorganization Plans        
Restructuring Reserve [Roll Forward]        
Beginning liability balance     24,148  
Charges     12,060  
Cash payments and adjustments     (29,284)  
Ending liability balance 6,924   6,924  
2015 and 2016 Reorganization Plans | Employee Severance and Other Termination Costs        
Restructuring Reserve [Roll Forward]        
Beginning liability balance     21,092  
Charges     7,126  
Cash payments and adjustments     (23,804)  
Ending liability balance 4,414   4,414  
2015 and 2016 Reorganization Plans | Other        
Restructuring Reserve [Roll Forward]        
Beginning liability balance     3,056  
Charges     4,934  
Cash payments and adjustments     (5,480)  
Ending liability balance $ 2,510   $ 2,510