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Basis of Presentation and Summary of Significant Accounting Policies - Noncontrolling Interest (Details) - Spark HoldCo			5 Months Ended	12 Months Ended
	Dec. 31, 2015	Aug. 01, 2014	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Economic interests percentage	22.49%	21.82%	21.82%	38.85%	22.49%
NuDevco Retail and Retailco (1)
Class of Stock [Line Items]
Economic interests percentage	77.51%	78.18%	78.18%	61.15%

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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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