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Derivative Instruments and Hedging Activities (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]    
Ineffectiveness on interest rate swaps$ 0$ (627,000)$ 0$ (1,497,000)
Derivatives expense (income)(210,154,000)31,854,000(212,308,000)(138,045,000)
Oil contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Payment (receipt) on settlements of derivative contracts1,857,0003,590,00023,857,00080,969,000
Fair value adjustments to derivative contracts - expense (income)(205,355,000)62,450,000(225,485,000)(144,471,000)
Total derivatives expense (income) - oil & natural gas(203,498,000)66,040,000(201,628,000)(63,502,000)
Natural Gas Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Payment (receipt) on settlements of derivative contracts(6,427,000)(13,626,000)(19,073,000)(34,005,000)
Fair value adjustments to derivative contracts - expense (income)(229,000)(19,933,000)8,393,000(39,041,000)
Total derivatives expense (income) - oil & natural gas$ (6,656,000)$ (33,559,000)$ (10,680,000)$ (73,046,000)