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Restructuring Charges (Summary of Changes in Restructuring Reserve) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring And Related Activities [Abstract]        
Beginning Balance $ 1,088 $ 1,245
Restructuring charges 1,586 1,586
Cash payments (33) (249) (179) (249)
Charges against assets (456) (467)
Ending balance $ 599 $ 1,337 $ 599 $ 1,337