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Acquisitions - Acquisition of Major Energy Companies - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 23, 2016
USD ($)
utility
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Aug. 01, 2016
$ / shares
Combination of Entities under Common Control, by Combination [Line Items]        
Amount recorded as equity transaction   $ (260)    
National Gas & Electric, LLC        
Combination of Entities under Common Control, by Combination [Line Items]        
Amount recorded as equity transaction   (1,400)    
Common Class B        
Combination of Entities under Common Control, by Combination [Line Items]        
Share price (in dollars per share) | $ / shares $ 20     $ 20
Major Energy Companies        
Combination of Entities under Common Control, by Combination [Line Items]        
Employment contract termination costs   1,500 $ 4,100  
Employee contract termination liability   2,600    
Major Energy Companies | National Gas & Electric, LLC        
Combination of Entities under Common Control, by Combination [Line Items]        
Initial working capital estimate $ 10,300      
Major Energy Companies        
Combination of Entities under Common Control, by Combination [Line Items]        
Number of utilities | utility 43      
Consideration amount $ 63,400      
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) (4,900) $ (4,700)  
Major Energy Companies | Common Class B        
Combination of Entities under Common Control, by Combination [Line Items]        
Share earnout maximum (in shares) | shares 40,718      
Value of shares for earnout $ 800 $ 800    
Number of shares issued for acquisition (shares) | shares 2,000,000      
Value of shares issued for acquisition $ 40,000      
Major Energy Companies | Common Class B | Maximum        
Combination of Entities under Common Control, by Combination [Line Items]        
Share earnout maximum (in shares) | shares 200,000 200,000    
Major Energy Companies | Major Energy Companies        
Combination of Entities under Common Control, by Combination [Line Items]        
Working capital $ 4,300