(5) Investment in Sunrise Energy (Details) - Condensed Balance Sheet (Sunrise Energy, USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Sunrise Energy
(5) Investment in Sunrise Energy (Details) - Condensed Balance Sheet [Line Items]
Current assets	$ 2,849
Oil and gas properties, net	6,777
	9,626
Total liabilities	661
Members' capital	8,965
	$ 9,626

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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No definition available.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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No definition available.

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- Definition

Net amount of capitalized costs relating to oil and gas producing activities.

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No definition available.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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No definition available.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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No definition available.

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- Definition

Amount of liabilities and partners' capital, including the portion of equity attributable to noncontrolling interests, if any.

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No definition available.

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