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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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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.

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

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Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Summary of Significant Accounting Policies, Derivatives by Hedging Relationship and Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Value	$ (195)	$ (195)	$ (7)	$ 48	$ (195)
Factors impacting the change in the net value of the Company's fair value contracts [Abstract]
Net Fair Value January 1	(195)	(7)
Net realized (gains) losses	195	7
Net unrealized gains (losses)	48	(195)
Net Fair Value December 31	48	(195)	(7)
Company's asset retirement obligations [Roll Forward]
Balance on January 1	2,469	2,464
Liabilities incurred	162	39
Accretion of discount	92	93
Liabilities settled	(394)	(127)
Balance on December 31	2,329	2,469	2,464
Level 1 Quoted Prices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Value	0	0	0	0	0
Factors impacting the change in the net value of the Company's fair value contracts [Abstract]
Net Fair Value January 1	0	0
Net realized (gains) losses	0	0
Net unrealized gains (losses)	0	0
Net Fair Value December 31	0	0	0
Level 2 Observable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Value	(195)	(195)	(7)	48	(195)
Factors impacting the change in the net value of the Company's fair value contracts [Abstract]
Net Fair Value January 1	(195)	(7)
Net realized (gains) losses	195	7
Net unrealized gains (losses)	48	(195)
Net Fair Value December 31	48	(195)	(7)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives (fair value contracts) - Current assets				112	0
Derivatives (fair value contracts) - Current liabilities				(64)	(195)
Net Value	48	(195)		48	(195)
Factors impacting the change in the net value of the Company's fair value contracts [Abstract]
Net Fair Value January 1	(195)
Net Fair Value December 31	48	(195)
Fair Value, Measurements, Recurring [Member] \| Counterparty Offsets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives (fair value contracts) - Current assets				(266)	0
Derivatives (fair value contracts) - Current liabilities				266	0
Net Value	0	0		0	0
Factors impacting the change in the net value of the Company's fair value contracts [Abstract]
Net Fair Value January 1	0
Net Fair Value December 31	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 Quoted Prices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives (fair value contracts) - Current assets				0	0
Derivatives (fair value contracts) - Current liabilities				0	0
Net Value	0	0		0	0
Factors impacting the change in the net value of the Company's fair value contracts [Abstract]
Net Fair Value January 1	0
Net Fair Value December 31	0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 Observable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives (fair value contracts) - Current assets				378	0
Derivatives (fair value contracts) - Current liabilities				(330)	(195)
Net Value	(195)	(195)		48	(195)
Factors impacting the change in the net value of the Company's fair value contracts [Abstract]
Net Fair Value January 1	(195)
Net Fair Value December 31	48	(195)
Fair Value, Measurements, Recurring [Member] \| Level 3 Unobservable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives (fair value contracts) - Current assets				0	0
Derivatives (fair value contracts) - Current liabilities				0	0
Net Value	0	0		$ 0	$ 0
Factors impacting the change in the net value of the Company's fair value contracts [Abstract]
Net Fair Value January 1	0
Net Fair Value December 31	0	0
Commodity Contract [Member] \| Revenues - Marketing [Member] \| Not Designated as Hedging Instrument [Member]
Earnings (loss) recognized in income [Abstract]
Earnings	$ 243	$ (188)	$ 312