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Debt - Components of Debt (Details) - USD ($) $ in Thousands			12 Months Ended
		Oct. 05, 2016	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total current debt			$ 73,370	$ 27,806
Convertible subordinated notes to affiliates	[1]		6,582	0
Long-term portion of Senior Credit Facility-Acquisition Line	[1]		0	14,592
Subordinated debt—affiliate	[1]		5,000	0
Total long-term debt			5,000	20,931
Convertible subordinated notes to affiliates	[1]		0	6,339
Total debt			78,370	48,737
Trade Credit Arrangements With Pacific Summit Energy LLC
Debt Instrument [Line Items]
Total current debt			15,501	0
Senior Credit Facility
Debt Instrument [Line Items]
Letters of credit issued			$ 29,600	$ 21,500
Weighted average interest rate on current portion of debt			4.93%	3.90%
Convertible Subordinated Notes
Debt Instrument [Line Items]
Total long-term debt			$ 0
Senior Credit Facility | Working Capital Line
Debt Instrument [Line Items]
Total current debt			29,000	$ 22,500
Senior Credit Facility | Acquisition Line
Debt Instrument [Line Items]
Total current debt			$ 22,287	$ 5,306
Common Class B | CenStar Note
Debt Instrument [Line Items]
Number of shares, irrevocable commitment to convert (in shares)		134,731
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The effective interest rate during the reporting period.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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