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Restructuring and Related Activities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Restructuring and Related Activities [Abstract]          
Restructuring Charges $ 0 $ 1,398 $ 0 $ 1,398  
Restructuring Reserve $ 0   $ 0   $ 1,000