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Income Taxes - Narrative (Details) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 08, 2016 | Apr. 01, 2016 | Feb. 03, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Aug. 01, 2014
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Income tax rate |  |  |  |  | 13.70% | 7.10% |  |
Statutory income rate |  |  |  |  | 35.00% | 34.00% |  |
Current deferred tax liabilities |  |  |  |  |  | $ 900,000 |  |
Net deferred tax asset |  |  |  |  | $ 54,109,000 | 22,527,000 |  |
Income tax penalties and interest expense |  |  |  |  | 0 | 0 | $ 0 |
Income tax penalties and interest liability |  |  |  |  | 0 | 0 | 0 |
Unrecognized tax benefits |  |  |  |  | 0 | 0 | $ 0 |
Number of shares of common stock exchanged (in shares) |  | 500,000 | 1,725,000 | 1,000,000 |  |  |  |
Deferred tax assets | [1] |  |  |  | 55,047,000 | 23,380,000 |  |
Deferred tax liability | [1] |  |  |  | 938,000 | 853,000 |  |
Federal |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  | 6,500,000 |  |  |
State |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  | 6,400,000 |  |  |
NuDevco |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Net deferred tax asset |  |  |  |  |  |  |  | $ 15,600,000
NuDevco | Tax Receivable Agreement |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Long-term liability |  |  |  |  | 49,900,000 | 20,700,000 |  | 20,700,000
Long-term deferred tax asset |  |  |  |  |  |  |  | $ 7,900,000
Deferred Tax Assets, Gross, Noncurrent |  |  |  |  | $ 20,000,000 |  |  |
Retailco | Affiliated Entity |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Number of shares of common stock exchanged (in shares) |  | 500,000 | 1,725,000 | 1,000,000 |  |  |  |
Deferred Tax Assets, Investment Purchase in Affiliate |  | $ 5,300,000 | $ 7,600,000 | $ 8,000,000 |  |  |  |
Deferred Tax Liabilities, Gross, Noncurrent |  | 6,900,000 | 10,300,000 | $ 10,300,000 |  |  |  |
Deferred Tax Assets, Gross, Noncurrent |  | $ 2,600,000 | $ 3,900,000 |  |  |  |  |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2015-17 |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | 23,400,000 |  |
Deferred tax liability |  |  |  |  |  | $ 900,000 |  |
[1] | See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
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