Transactions with Affiliates (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2015	Jul. 08, 2015
Related Party Transaction [Line Items]
Accounts receivable - affiliates		$ 1,840,000	$ 1,231,000
Accounts payable - affiliates		1,962,000	1,017,000
Prepaid assets - affiliate		210,000
Asset optimization revenues - affiliates	[1]	1,494,000	2,318,000	$ 314,000
Cost of revenues		$ 152,600,000	282,300,000	192,100,000
Number of additional years extended		3 years
Retail cost of revenues	[2]	$ 241,188,000	258,616,000	233,026,000
General and administrative (less than)	[3]	61,682,000	45,880,000	35,020,000
Net capital distributions		0	36,406,000	59,337,000
Contributions from NuDevco		$ 129,000	0	0
Tax receivable agreement, net cash savings, percentage		15.00%
Convertible Debt | Censtar Convertible Debt | CenStar
Related Party Transaction [Line Items]
Issued amount						$ 2,100,000.0
Convertible Debt | Oasis Note | Oasis
Related Party Transaction [Line Items]
Issued amount					$ 5,000,000.0
Affiliated Entity
Related Party Transaction [Line Items]
Asset optimization revenues - affiliates		$ 1,101,000	12,842,000	14,940,000
Cost of revenues		11,285,000	30,910,000	15,928,000
Retail cost of revenues		17,000	13,000	55,000
Sales of electricity to affiliate		0	2,170,000	4,022,000
General and administrative (less than)		0	100,000	100,000
Affiliated Entity | Marlin Processing Agreement
Related Party Transaction [Line Items]
Asset optimization revenues - affiliates				3,000,000
Affiliated Entity | Purchased Natural Gas from Affiliate
Related Party Transaction [Line Items]
Cost of revenues		11,300,000	30,300,000	17,700,000
Affiliated Entity | Purchased Natural Gas Sold to Affiliate
Related Party Transaction [Line Items]
Asset optimization revenues - affiliates		1,100,000	12,800,000	11,900,000
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]
Sales of electricity to affiliate		0	2,200,000	4,000,000
Affiliated Entity | Affiliate Derivative Instruments
Related Party Transaction [Line Items]
Cost of revenues		0	600,000	(1,800,000)
Affiliated Entity | Allocated Overhead Costs
Related Party Transaction [Line Items]
General and administrative (less than)		$ 2,100,000	5,100,000	7,400,000
Affiliated Entity | Residual Commissions
Related Party Transaction [Line Items]
General and administrative (less than)			$ 100,000	$ 100,000
NuDevco Retail Holdings and NuDevco Retail
Related Party Transaction [Line Items]
Tax receivable agreement, net cash savings, percentage		85.00%
Tax receivable agreement, deferral period (in years)		5 years
Tax receivable agreement, coverage percentage		130.00%
Tax receivable agreement, target dividend (in dollars per share)		$ 0.3625

[1] Net asset optimization revenues includes asset optimization revenues—affiliates of $1,101, $12,842 and $14,940 for the years ended December 31, 2015, 2014 and 2013, respectively, and asset optimization revenues—affiliates cost of revenues of $11,285, $30,910 and $15,928 for the years ended December 31, 2015, 2014 and 2013, respectively.

[2] Retail cost of revenues includes retail cost of revenues—affiliates of $17, $13 and $55 for the years December 31, 2015, 2014 and 2013, respectively.

[3] General and administrative includes general and administrative expense—affiliates of $0, less than $100 and less than $100 for the years ended December 31, 2015, 2014 and 2013, respectively.