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Properties and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Properties and Equipment
Proved oil and gas properties	$ 6,362,570	$ 5,724,940
Unproved oil and gas properties	375,428	467,483
Gathering and pipeline systems	239,958	239,656
Land, building and other equipment	94,243	86,137
Properties and Equipment, gross, total	7,072,199	6,518,216
Accumulated depreciation, depletion and amortization	(2,525,972)	(2,207,239)
Properties and Equipment, Net	$ 4,546,227	$ 4,310,977

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- Definition

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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Carrying amount at the balance sheet date for land, building, and other equipment used in the normal conduct of business and not intended for resale. Amount does not include depreciation.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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

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

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