Transactions with Affiliates (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Prepaid assets-affiliates	$ 120,000		$ 120,000			$ 0
Optimization Revenues - Affiliates	(545,000)	$ (141,000)	$ 1,317,000	[1]	$ 1,681,000
Number of additional years extended			3 years
Retail cost of revenues	60,967,000	51,863,000	$ 176,000,000	[1]	192,371,000
General and Administrative Expense - Affiliates	15,493,000	10,634,000	43,909,000	[1]	28,494,000
Payments of distributions to affiliates			11,700,000
Contributions from parent			129,000	[1]	0
Net capital distributions			$ 11,691,000	[1]	0
Tax receivable agreement, net cash savings			15.00%
Affiliated Entity
Related Party Transaction [Line Items]
Accounts receivable-affiliates	1,400,000		$ 1,400,000			1,200,000
Accounts payable-affiliates	1,900,000		1,900,000			$ 1,000,000
Prepaid assets-affiliates	100,000		100,000
Affiliated Entity | Purchased Natural Gas From Affiliate
Related Party Transaction [Line Items]
Cost of revenues	3,400,000	6,500,000	9,600,000		25,000,000
Affiliated Entity | Purchased Natural Gas Sold To Affiliate
Related Party Transaction [Line Items]
Optimization Revenues - Affiliates	300,000	3,200,000	900,000		10,300,000
Affiliated Entity | Marlin Transportation Agreement
Related Party Transaction [Line Items]
Retail cost of revenues	100,000	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	0	0		(600,000)
Affiliated Entity | Allocated Overhead Costs
Related Party Transaction [Line Items]
General and Administrative Expense - Affiliates	600,000	800,000	2,300,000		4,100,000
Affiliated Entity | Residual Commissions
Related Party Transaction [Line Items]
General and Administrative Expense - Affiliates	$ 0	$ 0	$ 0		100,000
Majority Shareholder
Related Party Transaction [Line Items]
Net capital distributions					$ 36,400,000
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

[1] Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC on May 12, 2015 from an affiliate. See Note 2 “Basis of Presentation” and Note 3 "Acquisitions" for further discussion.