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Income Taxes - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating Loss Carryforwards [Line Items]      
Provisional income tax expense (benefit) $ 14,486,000    
Brand      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, valuation allowance $ 0 $ 0 $ 0
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards   82,450,000  
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards   $ 65,347,000