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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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