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Supplemental Information on Oil and Natural Gas Producing Activities - Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Costs Incurred, Acquisition of Oil and Gas Properties [Abstract]

Proved

$ 1,761,556

$ 58,190

$ 1,346,303

Unproved

377,185

320,361

352,648

Exploration

120,438

^[1]

98,849

^[1]

31,717

^[1]

Development

1,704,991

^[2]

1,296,903

^[2]

1,006,232

^[2]

Total cost incurred

$ 3,964,170

$ 1,774,303

$ 2,736,900

[1]	Includes seismic costs of $15.3 million, $4.9 million and $4.1 million for 2012, 2011 and 2010, respectively.
[2]	Includes loss on the construction of the Century Plant of $50.0 million, $25.0 million and $105.0 million for 2012, 2011 and 2010, respectively. See Note 12.

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Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties.

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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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