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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2018
Reconciliation of federal statutory income tax to effective income tax      
Income tax expense $ 173 $ 623  
Federal      
Reconciliation of federal statutory income tax to effective income tax      
Income tax receivable     $ 1,500