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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating Loss Carryforwards [Line Items]      
Provisional income tax benefit $ 6,300    
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate $ 5,600 $ 6,536 $ 6,256
Unrecognized tax benefits, income tax penalties and interest accrued   300 $ 300
Federal      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards   37,700  
State      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards   33,700  
State | Latest tax year      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards   11,800  
State | Tax year 2023-2027      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards   $ 1,200