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Oil and Gas Properties (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Proven Properties [Abstract]
Acquisition, equipment, exploration, drilling and evnironmental costs	$ 7,235,765	$ 5,974,604
Less: Accumulated depletion, depreciation and amortization	(5,578,265)	(2,322,982)
Proved	1,657,500	3,651,622
Unproven Properties:
Unproven properties not being amortized	0	537,526
Net capitalized costs - oil and gas properties	$ 1,657,500	$ 4,189,148

Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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