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Income Taxes - Components of Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal     $ (1,682)
Foreign $ 22 $ 304 2,518
State and local 204 113 38
Total current expense (benefit) for income taxes 226 417 874
Deferred:      
Federal 136 162 205
Foreign (320) 116 (27,932)
State and local (115) 82 107
Total deferred expense (benefit) for income taxes (299) 360 (27,620)
Total expense (benefit) for income taxes $ (73) $ 777 $ (26,746)