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Restructuring and Other Charges - Rollforward of Accrued Liability Balance Related to Restructuring (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Restructuring Charges Accrual                
Beginning balance       $ 712 $ 0 $ 712 $ 855  
Additions for costs expensed $ 141 $ 422 $ 366 457 0 1,386 16,901  
Less non-cash expense           (997) (1,828)  
Reductions for payments           (1,101) (15,216)  
Ending balance 0         0 712 $ 0
Spin-off                
Restructuring Charges Accrual                
Beginning balance       712 0 712 855  
Additions for costs expensed           1,386 3,573 9,100
Less non-cash expense           (997) (1,828)  
Reductions for payments           (1,101) (1,888)  
Ending balance 0         0 712 0
Cost Reduction Plan                
Restructuring Charges Accrual                
Beginning balance       $ 0 $ 0 0 0  
Additions for costs expensed           0 13,328  
Less non-cash expense           0 0  
Reductions for payments           0 (13,328)  
Ending balance $ 0         $ 0 $ 0 $ 0