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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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