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PROPERTY AND EQUIPMENT (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment        
Accumulated depletion $ (8,460,589) $ (8,237,186)    
Accumulated depreciation and amortization (50,058) (46,908)    
Total net property, plant, and equipment 818,569 1,754,238    
Capitalized Costs of Unproved Properties        
Acquisition costs 5,078 4,155 2,515 36,347
Total cumulative acquisition costs 48,095      
Exploration costs 4,722 194 57 577
Total cumulative exploration costs 5,550      
Total unproved oil and natural gas properties 9,800 4,349 2,572 36,924
Total cumulative unproved oil and natural gas properties 53,645      
Company expects substantially all of its unproved costs wil be reclassified to proved properties (in years) 10 years      
Proved oil and gas properties
       
Property, Plant and Equipment        
Property, plant and equipment, gross 9,213,668 9,696,498    
Unproved oil and gas properties
       
Property, Plant and Equipment        
Property, plant and equipment, gross 53,645 277,798    
Oil and natural gas properties
       
Property, Plant and Equipment        
Accumulated depletion (8,460,589) [1] (8,237,186) [1]    
Total net property, plant, and equipment 806,724 1,737,110    
Furniture and fixtures, leasehold improvements, computer hardware and software, and other equipment
       
Property, Plant and Equipment        
Property, plant and equipment, gross 61,903 64,036    
Accumulated depreciation and amortization (50,058) (46,908)    
Total net property, plant, and equipment $ 11,845 $ 17,128    
[1] Includes inception-to-date ceiling test write-downs.