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Supplemental Financial Data - Oil and Gas Producing Activities (unaudited) (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Oil and gas properties
Proved oil and gas properties	$ 91,132	$ 89,392
Unproved properties not subject to depletion	1,126	1,369
Accumulated depreciation, depletion, amortization and impairment	(58,946)	(40,502)
Net oil and gas properties	$ 33,312	$ 50,259

Capitalized costs of proved properties that include fee ownership or a lease, concession, or other interest representing the right to extract oil or gas subject to such terms as may be imposed by the conveyance of that interest.

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- Definition

Capitalized costs of unproven properties that include fee ownership or a lease, concession, or other interest representing the right to extract oil or gas subject to such terms as may be imposed by the conveyance of that interest.

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