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Debt - Subordinated Debt Facility (Details) - USD ($)
$ in Thousands
Dec. 27, 2016
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Subordinated debt—affiliate [1]   $ 5,000 $ 0
Subordinated Debt | Retailco      
Debt Instrument [Line Items]      
Subordinated borrowing, interest rate 5.00%    
Subordinated debt—affiliate $ 25,000 $ 0  
Subordinated debt, advances $ 1,000    
Subordinated debt, interest rate on advances 5.00%    
Minimum availability under the borrowing base $ 5,000    
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.