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Properties and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Properties and Equipment, Net
Proved oil and gas properties	$ 6,954,493	$ 6,362,570
Unproved oil and gas properties	352,182	375,428
Gathering and pipeline systems	240,201	239,958
Land, buildings and other equipment	101,026	94,243
Properties and Equipment, gross, total	7,647,902	7,072,199
Accumulated depreciation, depletion and amortization	(2,822,378)	(2,525,972)
Properties and Equipment, Net	$ 4,825,524	$ 4,546,227

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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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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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