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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Current income tax expense $ 15 $ 7 $ 8 $ 7
Deferred income tax benefit (149) (20) (68) (99)
Total benefit $ (134) $ (13) $ (60) $ (92)