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Supplementary Oil and Natural Gas Disclosures (Unaudited) (Capitalized Cost for Oil and Natural Gas Producing Activities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Supplementary Oil and Natural Gas Disclosures (Unaudited) [Abstract]
Capitalized Costs, Proved properties	$ 1,982,657	$ 1,049,140
Capitalized Costs, Unproved properties	36,992	29,382
Capitalized costs, accumulated depreciation, depletion and amortization	(424,520)	(303,566)
Net capitalized costs	$ 1,595,129	$ 774,956

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.

+ References+ Details