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Basis of Presentation and Summary of Significant Accounting Policies - Trademarks (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Asset optimization revenue |  | $ 133,000,000 |  | $ 154,100,000 |  | $ 284,600,000 |
Cost of revenues |  | 133,600,000 |  | 152,600,000 |  | 282,300,000 |
Bad debt expense |  | 1,261,000 | [1] | 7,908,000 | [2] | 10,164,000 |
Intangible assets, current | [3] | 12,113,000 |  | 6,627,000 |  |  |
Customer relationships, net | [3] | 21,410,000 |  | 6,802,000 |  |  |
Intangible assets |  | 39,862 |  |  |  |  |
Amortization expense |  | 0 |  | 0 |  | 0 |
Impairment charges |  | 0 |  |  |  |  |
Trademarks |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets |  | 6,339,000 |  | 1,194,000 |  | 0 | $ 0
Amortization expense |  | $ 357,000 |  | 74,000 |  | 0 |
Impairment charges |  |  |  | $ 0 |  | $ 0 |
[1] | Financial information has been recast to include results attributable to the acquisition of the Major Energy Companies from an affiliate on August 23, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.
[2] | Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC by an affiliate on May 12, 2015. See Notes 2 "Basis of Presentation and Summary of Significant Accounting Policies" for further discussion.
[3] | See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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