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Restructuring and Impairment Charges (Components of Restructuring and Impairment Charges) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring and Impairment Charges [Abstract]        
Impairment charge for leasehold improvements and equipment   $ 1,319 $ 438 $ 1,319
Employee severance and retention $ 1   (3)  
Other charges related to facility closure 266   712  
Total restructuring and impairment charges $ 267 $ 1,319 $ 1,147 $ 1,319