Summary of Significant Accounting Policies, Derivatives by Hedging Relationship and Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Fair Value, Measurements, Recurring [Member]
Fair Value Assets (Liabilities), Net [Abstract]
Derivatives (fair value contracts) - Current assets	$ 468		$ 112
Derivatives (fair value contracts) - Current liabilities	0		(64)
Net Value	468		48
Fair Value, Measurements, Recurring [Member] \| Counterparty Offsets [Member]
Fair Value Assets (Liabilities), Net [Abstract]
Derivatives (fair value contracts) - Current assets	(282)		(266)
Derivatives (fair value contracts) - Current liabilities	282		266
Net Value	0		0
Fair Value, Measurements, Recurring [Member] \| Level 1 Quoted Prices [Member]
Fair Value Assets (Liabilities), Net [Abstract]
Derivatives (fair value contracts) - Current assets	0		0
Derivatives (fair value contracts) - Current liabilities	0		0
Net Value	0		0
Fair Value, Measurements, Recurring [Member] \| Level 2 Observable [Member]
Fair Value Assets (Liabilities), Net [Abstract]
Derivatives (fair value contracts) - Current assets	750		378
Derivatives (fair value contracts) - Current liabilities	(282)		(330)
Net Value	468		48
Fair Value, Measurements, Recurring [Member] \| Level 3 Unobservable [Member]
Fair Value Assets (Liabilities), Net [Abstract]
Derivatives (fair value contracts) - Current assets	0		0
Derivatives (fair value contracts) - Current liabilities	0		0
Net Value	0		$ 0
Commodity Contract [Member] \| Revenues - Marketing [Member] \| Not Designated as Hedging Instrument [Member]
Earnings (Loss) Recognized in Income [Abstract]
Earnings (loss)	$ 420	$ 158

Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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