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Acquisitions - Acquisition of Major Energy Companies - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Aug. 23, 2016
USD ($)
utility
$ / shares
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
 [2]
Dec. 31, 2014
USD ($)
Aug. 01, 2016
$ / shares
Business Acquisition [Line Items]          
Amount recorded as equity transaction   $ 3,873 [1] $ 0 $ 0  
Major Energy Companies          
Business Acquisition [Line Items]          
Number of utilities | utility 43        
Consideration amount $ 63,200        
Working capital 4,300        
Litigation reserve 5,000        
Installment and earnout payments (up to) 35,000        
Installment and earnout payments purchase date value 13,100        
Amount recorded as equity transaction 6,000 4,700      
Contributed revenues   125,600      
Contributed earnings   1,300      
Major Energy Companies          
Business Acquisition [Line Items]          
Employment contract termination costs   4,100      
Major Energy Companies | Major Energy Companies          
Business Acquisition [Line Items]          
Working capital $ 4,300        
Common Class B          
Business Acquisition [Line Items]          
Share price (in dollars per share) | $ / shares $ 20       $ 20
Common Class B | Major Energy Companies          
Business Acquisition [Line Items]          
Share amount maximum (in shares) | shares 40,718        
Value of shares for earnout $ 800        
Value of shares issued for acquisition $ 40,000        
Common Class B | Major Energy Purchase Agreement          
Business Acquisition [Line Items]          
Number of shares issued for acquisition (in shares) | shares 2,000,000        
Maximum | Common Class B | Major Energy Companies          
Business Acquisition [Line Items]          
Share amount maximum (in shares) | shares 200,000        
National Gas & Electric, LLC          
Business Acquisition [Line Items]          
Amount recorded as equity transaction   $ 1,400      
National Gas & Electric, LLC | Major Energy Companies          
Business Acquisition [Line Items]          
Initial working capital estimate $ 10,300        
[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.