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Basis of Presentation and Summary of Significant Accounting Policies - Non-Compete Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, current | [1] | $ 12,113 | $ 6,627 |
Amortization expense |  | 0 | $ 0 | $ 0
Non-compete agreements | Provider Companies and Major Energy Companies |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, current |  | 1,200 |  |
Intangible assets, non-current |  | 1,400 |  |
Amortization expense |  | $ 900 |  |
[1] | See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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