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Properties and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Properties and Equipment, Net
Proved Oil and Gas Properties	$ 5,724,940	$ 5,006,846
Unproved Oil and Gas Properties	467,483	478,942
Gathering and Pipeline Systems	239,656	238,660
Land, Building and Other Equipment	86,137	80,908
Property, plant and equipment, gross, total	6,518,216	5,805,356
Accumulated Depreciation, Depletion and Amortization	(2,207,239)	(1,870,772)
Properties and Equipment, Net	$ 4,310,977	$ 3,934,584

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Carrying amount at the balance sheet date for gathering and pipeline assets used in the normal conduct of business and not intended for resale. Amount does not include depreciation.

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The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Oil and Gas properties with proved reserves under the successful effort method.

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