Organization and Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014 region	Dec. 31, 2013	Dec. 31, 2012
Nature of operations [Abstract]
Number of operating regions in domicile country	3
Accounts Receivable [Abstract]
Allowance for doubtful accounts	$ 407	$ 407
Oil and gas properties, full cost method of accounting:
Discount rate used in future net cash flows relating to proved oil and gas reserves (in hundredths)	10.00%
Share-Based Payments [Abstract]
Stock-based compensation expense	2,703us-gaap_ShareBasedCompensation	2,114us-gaap_ShareBasedCompensation	2,091us-gaap_ShareBasedCompensation
Entity's asset retirement obligation transactions [Roll Forward]
Beginning asset retirement obligation	9,888us-gaap_AssetRetirementObligation	11,381us-gaap_AssetRetirementObligation
New wells placed on production and other	444	183
Deletions related to property disposals and plugging costs	(1,318)	(2,491)
Accretion expense	(559)	(615)	(457)
Revisions	198	151
Discontinued operations	(276)	49
Ending asset retirement obligation	9,495us-gaap_AssetRetirementObligation	9,888us-gaap_AssetRetirementObligation	11,381us-gaap_AssetRetirementObligation
Revenue Recognition and Major Purchasers [Abstract]
Entity wide revenue, major customers (in hundredths)	62.00%us-gaap_ConcentrationRiskPercentage1	49.00%us-gaap_ConcentrationRiskPercentage1	39.00%us-gaap_ConcentrationRiskPercentage1
Entity wide revenue, number of major purchasers of oil and gas	2	2	3
Income Taxes [Abstract]
Valuation allowance for deferred tax assets	$ 60,086	$ 75,566	$ 89,712

Asset Retirement Obligation, Discontinued Operations

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Discount rate used on future net cash flows relating to proved oil and gas reserves to derive net capitalize cost of oil and gas properties.

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Number of purchasers who accounted for 10 percent or more of an entity's revenues.

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The number of regions in which oil and gas assets are located with in domestic country.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Article 5

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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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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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