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Acquisitions - Acquisition of CenStar Energy Corp - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 08, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2016
Business Acquisition [Line Items]          
Contingent consideration - earnout obligations incurred in connection with the Provider Companies and Major Energy Companies acquisitions   $ 18,936 [1] $ 0 [2] $ 0  
Revenues   546,697 [3] 358,153 [4] 322,876  
Operating loss   $ (84,001) [3] (29,905) [4] $ 3,841  
CenStar          
Business Acquisition [Line Items]          
Purchase price $ 8,300        
EBITDA attributable to operations, earn-out 500   500   $ 1,500
Revenues     21,400    
Operating loss     1,400    
Acquisition costs     $ 100    
CenStar | Senior Secured Revolving Credit Facility          
Business Acquisition [Line Items]          
Initial working capital estimate 10,400        
Contingent consideration - earnout obligations incurred in connection with the Provider Companies and Major Energy Companies acquisitions 16,600        
CenStar | Convertible Debt | Censtar Convertible Debt          
Business Acquisition [Line Items]          
Contingent consideration - earnout obligations incurred in connection with the Provider Companies and Major Energy Companies acquisitions $ 2,100        
[1] 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.
[2] 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.
[3] 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.
[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.