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Long-Term Debt (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2014 | Jul. 31, 2013 | Dec. 17, 2012 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Jan. 24, 2011 | May. 30, 2008
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  | $ 10,800,000 |  | $ 10,800,000 |  |  |  |  |
Deferred financing costs |  |  |  | 200,000 |  | 200,000 |  | $ 300,000 |  |  |
Amortization of deferred financing costs |  |  |  | 100,000 | $ 100,000 | 100,000 | $ 200,000 |  |  |  |
Interest expense |  |  |  | 207,000 | 222,000 | 588,000 | 535,000 |  |  |  |
NuDevco Retail Holdings | Spark HoldCo | Notes Payable |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Note payable | $ 50,000 |  |  |  |  |  |  |  |  |  |
Other Current Assets |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  | 200,000 |  | 200,000 |  | 200,000 |  |  |
Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  | $ 100,000 |  |  |
Working Capital Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 80,000,000 | $ 70,000,000 |  |  |  |  |  |  | $ 150,000,000 | $ 177,500,000.0
Working capital facility outstanding |  |  |  |  |  |  |  |  | $ 27,500,000 |  |
Working capital credit facility outstanding portion paid by affiliate | 29,000,000 |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding | 15,000,000 |  |  |  |  |  |  |  |  |  |
Fees on letters of credit issued and outstanding |  |  |  | 100,000 | 100,000 | 100,000 | 200,000 |  |  |  |
Nonutilization fee |  |  | 0.50% |  |  |  |  |  |  |  |
Interest expense |  |  |  | 100,000 | 100,000 | $ 300,000 | 100,000 |  |  |  |
Commitment fee percentage |  |  |  |  |  | 0.50% |  |  |  |  |
Commitment fee amount, less than |  |  |  | 100,000 | 100,000 | $ 100,000 | 100,000 |  |  |  |
Working Capital Facility | Eurodollar | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.00% | 3.00% |  |  |  |  |  |  |  |
Working Capital Facility | Eurodollar | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.25% | 3.75% |  |  |  |  |  |  |  |
Working Capital Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% | 2.00% |  |  |  |  |  |  |  |
Working Capital Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.25% | 2.75% |  |  |  |  |  |  |  |
Working Capital Facility | Cost of Funds Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.50% |  |  |  |  |  |  |  |  |
Working Capital Facility | Cost of Funds Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.75% |  |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 125,000,000 |  |  |  |  |  |  | $ 130,000,000 | 100,000,000
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 30,000,000 |  |  |  |  |  |  |  | $ 35,000,000
Revolving Credit Facility | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee amount, less than |  |  |  | 100,000 | $ 100,000 | 100,000 | $ 100,000 |  |  |  |
Line of credit facility, outstanding | 10,000,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 70,000,000.0 |  |  |  |  |  |  |  |  |  |
Working capital facility outstanding |  |  |  | $ 9,000,000 |  | $ 9,000,000 |  |  |  |  |
Contingent maximum borrowing capacity | $ 120,000,000.0 |  |  |  |  |  |  |  |  |  |
Reduction to interest rate if facility utilization is less than fifty percent | 0.25% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.375% |  |  |  |  |  |  |  |  |  |
Used capacity fee percentage | 2.00% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.50% |  |  |  |  |  |  |  |  |  |
Used capacity fee percentage | 2.50% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Eurodollar | Minimum | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.75% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Eurodollar | Maximum | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Base Rate | Minimum | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Base Rate | Maximum | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Cost of Funds Rate | Minimum | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Cost of Funds Rate | Maximum | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.50% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Base Rate Plus Margin | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated percentage interest rate | 2.00% |  |  |  |  |  |  |  |  |  |
Letters Of Credit Outstanding More Than Two Business Days | Base Rate |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 2.00% |  |  |  |  |

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