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Costs of Oil and Gas Properties Costs of Oil and Gas Properties (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Oil and Gas Property, Successful Effort Method, Gross [Abstract]
Property acquisitions, Proved	$ 41,098	$ 0	$ 9,556
Property acquisitions, Unproved	72,235	61,236	29,680
Development costs	349,972	328,418	238,197
Exploratory costs	10,898	27,425	7,528
Total	$ 474,203	$ 417,079	$ 284,961

- Definition

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

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- 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