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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 0 $ 56 $ 129
State 0 69 131
Current tax expense 0 125 260
Deferred:      
Federal 350 (380) 0
State 46 (46) 0
Deferred tax benefit 396 (426) 0
Total tax (expense) benefit $ 396 $ (301) $ 260