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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Expense (Benefit) [Abstract]    
Current federal tax expense (benefit) $ 240 $ (196)
Deferred federal income tax expense (benefit) 0 (4,741)
Federal income tax expense (benefit), continuing operations 240 (4,937)
Current state and local tax expense (benefit) 0 (28)
Deferred state and local income tax expense (benefit) 0 (29)
State and local income tax expense (benefit), continuing operations 0 (57)
Current foreign tax expense (benefit) 321 1,143
Deferred foreign income tax expense (benefit) (387) (152)
Foreign income tax expense (benefit), continuing operations (66) 991
Current income tax expense (benefit) 561 919
Deferred income tax expense (benefit) (387) (4,922)
Income tax expense (benefit) $ 174 $ (4,003)