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FAIR VALUE MEASUREMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair value and carrying value of financial instruments    
Derivative instruments assets $ 100,900  
Derivative instruments liabilities 24,400  
Credit Facility 348,000 105,000
Credit Facility, Fair Value 348,000 [1] 105,000 [1]
8 1/2% Senior Notes due 2014
   
Fair value and carrying value of financial instruments    
Notes payable, carrying value 590,513 587,611
Notes payable, fair value 630,072 [1] 653,250 [1]
Interest rate (as a percent) 8.50% 8.50%
7 1/4% Senior Notes due 2019
   
Fair value and carrying value of financial instruments    
Notes payable, carrying value 1,000,393 1,000,421
Notes payable, fair value 941,780 [1] 1,025,000 [1]
Interest rate (as a percent) 7.25% 7.25%
Carrying Amount
   
Fair value and carrying value of financial instruments    
Derivative instruments assets 100,937 100,043
Derivative instruments liabilities 24,415 28,944
Fair Value
   
Fair value and carrying value of financial instruments    
Derivative instruments assets 100,937 [1] 100,043 [1]
Derivative instruments liabilities 24,415 [1] 28,944 [1]
Using Quoted Prices in Active Markets for Identical Assets (Level 1) | 8 1/2% Senior Notes due 2014
   
Fair value and carrying value of financial instruments    
Notes payable, fair value 630,072  
Using Quoted Prices in Active Markets for Identical Assets (Level 1) | 7 1/4% Senior Notes due 2019
   
Fair value and carrying value of financial instruments    
Notes payable, fair value 941,780  
Using Significant Other Observable Inputs (Level 2)
   
Fair value and carrying value of financial instruments    
Credit Facility, Fair Value 348,000  
Using Significant Other Observable Inputs (Level 2) | Fair Value
   
Fair value and carrying value of financial instruments    
Derivative instruments assets 100,937  
Derivative instruments liabilities $ 24,415  
[1] The Company used various assumptions and methods in estimating the fair values of its financial instruments. The fair values of the senior notes were estimated based on quoted market prices. The carrying amount of the credit facility approximated fair value due to the short original maturities of the borrowings and because the borrowings bear interest at variable market rates. The methods used to determine the fair values of the derivative instruments are discussed above. See also Note 8 for more information on the derivative instruments.