Derivative Instruments and Fair Value Measurements - Use of Derivative Instruments (Details) - Commodity Contract - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenues – marketing
Derivatives, Fair Value [Line Items]
Gain (loss) on derivative	$ (7)	$ (748)	$ (5)	$ (48)
Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	263		263		$ 166
Liability derivatives	0		0		0
Less counterparty offsets	0		0		0
As reported fair value contracts	263		263		166
Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0		0		0
Liability derivatives	0		0		0
Less counterparty offsets	0		0		0
As reported fair value contracts	0		0		0
Current Liabilities
Derivatives, Fair Value [Line Items]
Asset derivatives	0		0		0
Liability derivatives	247		247		145
Less counterparty offsets	0		0		0
As reported fair value contracts	247		247		145
Other Liabilities
Derivatives, Fair Value [Line Items]
Asset derivatives	0		0		0
Liability derivatives	0		0		0
Less counterparty offsets	0		0		0
As reported fair value contracts	$ 0		$ 0		$ 0

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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