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Equity - Net Income and Income Tax on Non-controlling Interest (Details) - USD ($)
$ in Thousands
 5 Months Ended 12 Months Ended
Dec. 31, 2015
Aug. 01, 2014
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]            
Net income allocated to non-controlling interest       $ 52,300 $ 21,779  
Income tax expense (benefit) allocated to non-controlling interest       1,071 (331)  
Net income attributable to non-controlling interest       $ 51,229 [1] $ 22,110 [2] $ (4,211)
Spark HoldCo            
Class of Stock [Line Items]            
Economic interests percentage 22.49% 21.82% 21.82% 38.85% 22.49%  
Spark HoldCo | NuDevco Retail and Retailco LLC            
Class of Stock [Line Items]            
Economic interests percentage       61.15% 77.51%  
[1] 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.
[2] (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.