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Acquisitions - Acquisition of Major Energy Companies (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | [1] | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 79,147 | [1] |  | $ 18,379 | $ 0 | $ 0
National Gas & Electric, LLC | Major Energy Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash | 17,368 |  | $ 17,368 |  |  |
Property and equipment | 14 |  | 14 |  |  |
Non-current deferred tax assets | 1,042 |  | 1,042 |  |  |
Goodwill | 34,728 |  | 35,137 |  |  |
Net working capital, net of cash acquired | (6,746) |  | (6,345) |  |  |
Fair value of derivative liabilities | (7,260) |  | (7,260) |  |  |
Total | 68,390 |  | 69,200 |  |  |
Q4 2016 Adjustments |  |  |  |  |  |
Goodwill | (409) |  |  |  |  |
Net working capital, net of cash acquired | (401) |  |  |  |  |
Total | (810) |  |  |  |  |
Customer Relationships— Acquired | National Gas & Electric, LLC | Major Energy Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets - customer relationships & non-compete agreements | 24,271 |  | 24,271 |  |  |
Trademarks | National Gas & Electric, LLC | Major Energy Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Other assets - trademarks | $ 4,973 |  | $ 4,973 |  |  |
[1] | See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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