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Oil and Gas Operations (Unaudited) (Costs Incurred) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property acquisition:
Proved	$ 79,862	$ 214,993	$ 207,161
Unproved	58,634	91,888	201,881
Exploration	419,284	190,854	37,371
Development	749,256	623,775	332,541
Total costs incurred	$ 1,307,036	$ 1,121,510	$ 778,954

- 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.

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- Definition

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

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- Definition

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

+ References+ Details