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Disclosure About Oil and Gas Producing Activities (Unaudited) (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Oil And Gas Exploration And Production Industries Disclosures [Abstract]
Acquisition costs - unproved properties	$ 424,540,000	$ 47,979,000	$ 91,983,000
Acquisition costs - proved properties	224,410,000	0	0
Exploration	184,007,000	199,569,000	746,085,000
Development	186,755,000	587,618,000	675,718,000
Total	$ 1,019,712,000	$ 835,166,000	$ 1,513,786,000

- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

+ References+ Details

- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

+ References+ Details

- Definition

Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

+ References+ Details

- Definition

Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

+ References+ Details