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Transactions with Affiliates (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 27, 2016
Jan. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jul. 31, 2015
Jul. 08, 2015
Related Party Transaction [Line Items]              
Accounts receivable - affiliates [1]     $ 2,624,000 $ 1,840,000      
Accounts payable - affiliates [1]     3,775,000 1,962,000      
Asset optimization revenues - affiliates [3]     (586,000) [2] 1,494,000 [4] $ 2,318,000    
Cost of revenues     133,600,000 152,600,000 282,300,000    
Retail cost of revenues [5]     344,944,000 [2] 241,188,000 [4] 258,616,000    
General and administrative (less than) [6]     84,964,000 [2] 61,682,000 [4] 45,880,000    
Net capital distributions     0 [7] 0 [8] 36,406,000    
Payments of Distributions to Affiliates     0 [7] 0 [8] 47,554,000    
Contributions from NuDevco     0 [7] 129,000 [8] 0    
Adjustments to Additional Paid in Capital, Disgorgement of Short-Swing Profit     1,605,000        
Proceeds from disgorgement of stockholders short-swing profits     $ 941,000 [7] 0 [8] 0    
Tax receivable agreement, net cash savings, percentage     15.00%        
Subordinated debt—affiliate [1]     $ 5,000,000 0      
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  
Subordinated Debt | Retailco              
Related Party Transaction [Line Items]              
Subordinated borrowing, interest rate 5.00%            
Subordinated debt—affiliate $ 25,000,000   0        
Subordinated debt, advances $ 1,000,000            
Subordinated debt, interest rate on advances 5.00%            
Minimum availability under the borrowing base $ 5,000,000            
Affiliated Entity              
Related Party Transaction [Line Items]              
Prepaid assets - affiliate     0 210,000      
Asset optimization revenues - affiliates     154,000 1,101,000 12,842,000    
Cost of revenues         30,910,000    
Cost of Revenue     1,633,000 11,285,000 30,300,000    
Retail cost of revenues     9,000 17,000 13,000    
Sales of electricity to affiliate     0 0 2,170,000    
General and administrative (less than)     15,700,000 0 100,000    
Affiliated Entity | Marlin Transportation Agreement              
Related Party Transaction [Line Items]              
Retail cost of revenues     100,000 100,000 100,000    
Affiliated Entity | Affiliate Derivative Instruments              
Related Party Transaction [Line Items]              
Cost of revenues     0 600,000      
Affiliated Entity | Allocated Overhead Costs              
Related Party Transaction [Line Items]              
General and administrative (less than)     17,000,000 2,100,000 5,100,000    
Affiliated Entity | Residual Commissions              
Related Party Transaction [Line Items]              
General and administrative (less than)       100,000 100,000    
NuDevco Retail and Retailco LLC              
Related Party Transaction [Line Items]              
Net capital distributions     23,700,000.0 $ 15,600,000 $ 36,400,000    
Contributions from NuDevco     100,000        
NuDevco Retail and Retailco LLC | Payment of Income Taxes Incurred by the Company              
Related Party Transaction [Line Items]              
Payments of Distributions to Affiliates     $ 11,300,000        
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        
Retailco              
Related Party Transaction [Line Items]              
Proceeds from disgorgement of stockholders short-swing profits     $ 900,000        
Retailco | Affiliated Entity | Allocated Overhead Costs              
Related Party Transaction [Line Items]              
General and administrative (less than)     14,700,000        
Retailco | Affiliated Entity | Property and Equipment Capitalized              
Related Party Transaction [Line Items]              
Property, Plant and Equipment, Additions     1,300,000        
Retailco and NuDevco Retail | Tax Receivable Agreement              
Related Party Transaction [Line Items]              
Accounts payable - affiliates     1,400,000        
Subsequent Event | Retailco              
Related Party Transaction [Line Items]              
Proceeds from disgorgement of stockholders short-swing profits   $ 700,000          
Additional Paid-In Capital              
Related Party Transaction [Line Items]              
Adjustments to Additional Paid in Capital, Disgorgement of Short-Swing Profit     $ 1,605,000        
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.
[2] Financial information has been recast to include results attributable to the acquisition of Major Energy Companies by an affiliate on April 15, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.
[3] Net asset optimization revenues includes asset optimization (expense)/revenues—affiliates of $154, $1,101 and $12,842 for the years ended December 31, 2016, 2015 and 2014, respectively, and asset optimization revenues—affiliates cost of revenues of $1,633, $11,285 and $30,910 for the years ended December 31, 2016, 2015 and 2014, respectively.
[4] (2) Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC from an affiliate on May 12, 2015. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions", respectively, for further discussion.
[5] Retail cost of revenues includes retail cost of revenues—affiliates of $9, $17 and $13 for the years December 31, 2016, 2015 and 2014, respectively.
[6] General and administrative includes general and administrative expense—affiliates of $15,700, $0 and less than $100 for the years ended December 31, 2016, 2015 and 2014, respectively.
[7] Financial information has been recast to include results attributable to the acquisition of the Major Energy Companies from an affiliate on August 23, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.
[8] Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC by an affiliate on May 12, 2015. See Notes 2 "Basis of Presentation and Summary of Significant Accounting Policies" for further discussion.