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COSTS, EXPENSES, AND OTHER (Details) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 30, 2013
7 1/4% Senior Notes due 2019
Dec. 31, 2013
7 1/4% Senior Notes due 2019
Dec. 31, 2012
7 1/4% Senior Notes due 2019
Nov. 30, 2013
7 1/2% Senior Notes due 2020
Dec. 31, 2013
7 1/2% Senior Notes due 2020
Dec. 31, 2012
7 1/2% Senior Notes due 2020
Mar. 31, 2013
8 1/2% Senior Notes due 2014
Oct. 31, 2012
8 1/2% Senior Notes due 2014
Dec. 31, 2012
8 1/2% Senior Notes due 2014
Dec. 31, 2012
Arbitration Decision
Dec. 31, 2013
Arbitration Decision
Dec. 31, 2013
Texas Panhandle Area
Dec. 31, 2013
Texas Panhandle Area
Dec. 31, 2013
South Africa Block 2C
Costs, expenses, and other                                  
Gain on asset dispositions, net $ (202,023,000) $ 0 $ 0                       $ (193,000,000) $ (193,000,000) $ (9,000,000)
Loss on debt extinguishment, net 48,725,000 36,312,000 0 14,700,000     8,800,000     25,200,000 36,312,000            
Legal proceeding liabilities 0 29,251,000 6,500,000                   22,800,000        
Accretion of asset retirement obligations 2,982,000 6,663,000 6,082,000                            
Other, net 7,710,000 11,180,000 4,582,000                            
Costs, expenses and other (142,606,000) 83,406,000 17,164,000                            
Loss on Debt Extinguishment                                  
Face amount of senior notes that were redeemed       422,100,000     277,900,000     300,000,000 300,000,000            
Interest rate (as a percent)       7.25% 7.25% 7.25% 7.50% 7.50% 7.50% 8.50% 8.50% 8.50%          
Senior notes redemption price as a percentage of par (as a percent)       102.77%     101.50%     107.11% 110.24%            
Early tender premium on early redemption of senior notes       11,700,000     4,200,000                    
Call premium on early redemption of senior notes                   21,300,000 30,700,000            
Write-off of debt issuance costs and premium, net       3,000,000                          
Write-off of deferred debt issuance costs 8,900,000           4,600,000                    
Write-off of deferred debt issuance costs and unamortized discount                   3,900,000 5,600,000            
Legal Proceeding Liabilities                                  
Liability from arbitration decision                           24,200,000      
Payment for legal settlement   $ 7,000,000 $ 6,500,000