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PROPERTIES AND EQUIPMENT, NET (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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PROPERTIES AND EQUIPMENT, NET |  |
Proved Oil and Gas Properties | $ 5,969,544 | $ 5,724,940
Unproved Oil and Gas Properties | 463,455 | 467,483
Gathering and Pipeline Systems | 239,791 | 239,656
Land, Building and Other Equipment | 88,484 | 86,137
Property, plant and equipment, gross, total | 6,761,274 | 6,518,216
Accumulated Depreciation, Depletion and Amortization | (2,348,502) | (2,207,239)
Properties and Equipment, Net | $ 4,412,772 | $ 4,310,977

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