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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.

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