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Income Taxes - Income Tax Benefit Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Expected provision at federal statutory rate $ 26,635 $ 9,503  
Non-controlling interest (17,740) (7,356)  
State income taxes, net of federal income tax effect 1,346 (222)  
Other 185 49  
Provision (benefit) for income taxes $ 10,426 [1] $ 1,974 [2] $ (891)
[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.