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Transactions with Affiliates (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]          
Prepaid assets-affiliates $ 173,000   $ 173,000   $ 0
Optimization Revenues - Affiliates (67,000) $ 197,000 $ 1,862,000 $ 1,821,000  
Number of additional years extended     3 years    
Retail cost of revenues 42,120,000 52,387,000 $ 111,207,000 140,508,000  
General and Administrative Expense - Affiliates 12,978,000 9,747,000 27,683,000 17,860,000  
Net capital distributions     7,794,000 0  
Contributions from parent 129,000   $ 129,000 0  
Tax receivable agreement, net cash savings     15.00%    
Affiliated Entity          
Related Party Transaction [Line Items]          
Accounts receivable-affiliates 500,000   $ 500,000   1,200,000
Accounts payable-affiliates 800,000   800,000   $ 1,000,000
Prepaid assets-affiliates 200,000   200,000    
Affiliated Entity | Purchased Natural Gas From Affiliate          
Related Party Transaction [Line Items]          
Cost of revenues 3,100,000 9,800,000 6,200,000 17,900,000  
Affiliated Entity | Purchased Natural Gas Sold To Affiliate          
Related Party Transaction [Line Items]          
Optimization Revenues - Affiliates   4,600,000 0 7,100,000  
Affiliated Entity | Marlin Transportation Agreement          
Related Party Transaction [Line Items]          
Retail cost of revenues 100,000   100,000 100,000  
Affiliated Entity | Electricity Sales To Affiliate          
Related Party Transaction [Line Items]          
Retail Revenues - Affiliates 0 0 0 2,200,000  
Affiliated Entity | Affiliate Derivative Instruments          
Related Party Transaction [Line Items]          
Cost of revenues 0 (900,000) 0 (700,000)  
Affiliated Entity | Allocated Overhead Costs          
Related Party Transaction [Line Items]          
General and Administrative Expense - Affiliates 700,000 1,300,000 1,600,000 3,300,000  
Affiliated Entity | Residual Commissions [Member]          
Related Party Transaction [Line Items]          
General and Administrative Expense - Affiliates $ 0 $ 100,000 $ 0 100,000  
Majority Shareholder          
Related Party Transaction [Line Items]          
Net capital distributions       $ 43,500,000  
NuDevco Retail Holdings and NuDevco Retail          
Related Party Transaction [Line Items]          
Tax receivable agreement, net cash savings     85.00%    
Tax receivable agreement,, deferral period     5 years    
Tax receivable agreement, coverage percentage     130.00%    
Tax receivable agreement, target dividend (usd per share)     $ 0.3625