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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]    
Current income tax (benefit) expense $ (7) $ 0
Deferred income tax expense (benefit) 81 (79)
Total provision (benefit) $ 74 $ (79)