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Restructuring (Roll Forward of Restructuring Reserve) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2019 $ 308  
Additions 367 $ 100
Payments (225)  
Balance at March 31, 2020 $ 450