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Acquisitions - Acquisition of Oasis Power Holdings, LLC (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | [1] | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 79,147 | $ 18,379 | [1] | $ 0 | $ 0
Oasis |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  | 271 |  |  |
Net working capital, net of cash acquired |  | 1,831 |  |  |
Property and equipment |  | 38 |  |  |
Goodwill |  | 11,983 |  |  |
Fair value of derivative liabilities |  | (819) |  |  |
Total |  | 21,730 |  |  |
Customer Relationships— Acquired | Oasis |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Other assets - trademarks |  | 7,824 |  |  |
Trademarks | Oasis |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Other assets - trademarks |  | $ 602 |  |  |
[1] | See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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