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Debt - Convertible Subordinated Notes to Affiliates (Details) - USD ($)		Jan. 31, 2017	Jan. 08, 2017	Oct. 05, 2016	Jul. 31, 2015	Jul. 08, 2015	Dec. 31, 2016	Dec. 31, 2015	May 12, 2015	Aug. 01, 2014	May 29, 2014	Apr. 22, 2014
Debt Instrument [Line Items]
Convertible subordinated notes to affiliates	[1]						$ 6,582,000	$ 0
Current portion of Senior Credit Facility	[1]						$ 15,501,000	$ 0
Common Class B
Debt Instrument [Line Items]
Common stock, par value (in dollars per share)					$ 0.01	$ 0.01	$ 0.01	$ 0.01		$ 0.01	$ 0.01
Common Class A
Debt Instrument [Line Items]
Common stock, par value (in dollars per share)							$ 0.01	$ 0.01				$ 0.01
Shares issued, price per share (in dollars per share)					$ 16.21
Censtar Convertible Debt | Common Class B
Debt Instrument [Line Items]
Number of shares, irrevocable commitment to convert (in shares)				383,090
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, minimum borrowing capacity						$ 5,000,000.0
Convertible Subordinated Notes | Censtar Convertible Debt
Debt Instrument [Line Items]
Stated percentage interest rate						5.00%
Exercise of conversion rights term						18 months
Convertible Subordinated Notes | Censtar Convertible Debt | Common Class B
Debt Instrument [Line Items]
Conversion price per share (in dollars per share)						$ 16.57
Convertible Subordinated Notes | Censtar Convertible Debt | CenStar
Debt Instrument [Line Items]
Convertible subordinated notes to affiliates						$ 2,100,000
Convertible Subordinated Notes | Oasis Note
Debt Instrument [Line Items]
Stated percentage interest rate					5.00%
Conversion price per share (in dollars per share)									$ 14.00
Exercise of conversion rights term					18 months
Beneficial conversion feature					$ 800,000
Convertible Subordinated Notes | Oasis Note | Common Class B
Debt Instrument [Line Items]
Conversion price per share (in dollars per share)					$ 14.00
Convertible Subordinated Notes | Oasis Note | Oasis
Debt Instrument [Line Items]
Convertible subordinated notes to affiliates					$ 5,000,000
Major Energy Companies | Trade Credit Arrangements With Pacific Summit Energy LLC
Debt Instrument [Line Items]
Current portion of Senior Credit Facility							$ 15,501,000
Debt Instrument, Interest Rate, Effective Percentage							4.00%
Subsequent Event | Censtar Convertible Debt | Common Class B
Debt Instrument [Line Items]
Number of shares, irrevocable commitment to convert (in shares)			134,731
Subsequent Event | Oasis Note | Common Class B
Debt Instrument [Line Items]
Number of shares, irrevocable commitment to convert (in shares)		383,090
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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Face amount or stated value per share of common stock.

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