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Income Taxes (Domestic and Foreign Components of (Loss) Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]      
U.S. Federal $ (25,086) $ (13,762) $ (52,523)
Foreign (21,803) 1,696 (155,760)
Loss before income tax $ (46,889) $ (12,066) $ (208,283)