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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Current income tax expense $ 7 $ 522 $ 7 $ 1,739
Deferred income tax benefit (20) (80) (99) (59)
Total provision $ (13) $ 442 $ (92) $ 1,680