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Restructuring and Related Charges - Restructuring liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of restructuring liability      
Beginning balance $ 8,781 $ 11,985 $ 20,055
Restructuring and other charges 16,319 3,414 0
Payments (4,656) (7,037) (6,438)
Adjustments 443 419 (1,632)
Ending balance 20,887 8,781 11,985
Accounts payable and accrued expenses      
Schedule of restructuring liability      
Restructuring liabilities 9,800 3,100  
Lease and Related Costs, Net      
Schedule of restructuring liability      
Beginning balance 8,781 11,985 20,055
Payments (2,684) (3,623) (6,438)
Adjustments 443 419 (1,632)
Ending balance 6,540 8,781 $ 11,985
Severance And Other Employee Separation Costs      
Schedule of restructuring liability      
Restructuring and other charges 16,319 3,414  
Payments (1,972) $ (3,414)  
Ending balance $ 14,347