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Acquisitions - Acquisition of Provider Companies - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Aug. 01, 2016
Dec. 31, 2016
Dec. 31, 2015
 [2]
Dec. 31, 2014
Aug. 23, 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 $ 0  
Installment consideration payment   1,890 [1] 0 0  
Installment payment   66,652 [1] 49,826 44,000  
Common Class B          
Business Acquisition [Line Items]          
Issuance of Class B common stock to affiliates for Major Energy Companies acquisition   40,000 [1] $ 0 $ 0  
Share price (in dollars per share) $ 20       $ 20
Provider Companies          
Business Acquisition [Line Items]          
Purchase price $ 34,100        
Initial working capital estimate 1,300        
Earnout maximum 9,000        
Installment consideration payment 3,800        
Installment payment $ 400        
Revenue   46,800      
Operating loss   $ 12,800      
Provider Companies | Common Class B          
Business Acquisition [Line Items]          
Shares issued (shares) 699,742        
Issuance of Class B common stock to affiliates for Major Energy Companies acquisition $ 14,000        
Revolving Credit Facility | Acquisition Line | Provider Companies          
Business Acquisition [Line Items]          
Borrowing from credit facility $ 10,600        
[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.