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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 |  |  |

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