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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 |  |

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