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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
Current income tax expense $ 541 $ 326 $ 2,280 $ 2,581
Deferred income tax (benefit) expense (34) (163) (93) 139
Total provision $ 507 $ 163 $ 2,187 $ 2,720