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Cost Restructuring Plan - Rollforward of Restructuring Reserve (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring Reserve [Roll Forward]        
Beginning balance     $ 0  
Additions $ 1,092 $ 0 1,092 $ 0
Cash Payments     (288)  
Adjustments     0  
Ending balance 804   804  
Retention        
Restructuring Reserve [Roll Forward]        
Beginning balance     0  
Additions 787 0 787 0
Cash Payments     0  
Adjustments     0  
Ending balance 787   787  
Severance        
Restructuring Reserve [Roll Forward]        
Beginning balance     0  
Additions 288 0 288 0
Cash Payments     (288)  
Adjustments     0  
Ending balance 0   0  
Other        
Restructuring Reserve [Roll Forward]        
Beginning balance     0  
Additions 17 $ 0 17 $ 0
Cash Payments     0  
Adjustments     0  
Ending balance $ 17   $ 17