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Long-Term Debt (Details) (USD $)
3 Months Ended6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Debt Instrument [Line Items]     
Long-term Debt$ 1,187,300,000 $ 1,187,300,000 $ 1,176,700,000
Long-term Debt, Current Maturities    95,000
Notes payable, long term    1,176,622,000
Interest expense before capitalization of interest(27,000,000)(27,400,000)(54,000,000)(51,900,000) 
Less: capitalized interest1,300,00002,211,0003,500,000 
Interest expense, net of capitalized interest 27,417,000 48,369,000 
Line of Credit Facility, Maximum Borrowing Capacity375,000,000 375,000,000  
Loss on early extinguishment of debt 434,00001,852,000 
Long-term Debt, Fair Value1,300,000,000 1,300,000,000 1,300,000,000
Letter of Credit [Member]
     
Debt Instrument [Line Items]     
Line of Credit Facility, Amount Outstanding9,800,000 9,800,000  
Senior Secured Credit Facility [Member]
     
Debt Instrument [Line Items]     
Long-term Debt10,000,000 10,000,000 0
Senior Subordinated Notes Due 2020 [Member]
     
Debt Instrument [Line Items]     
Long-term Debt350,000,000 350,000,000 350,000,000
Debt Instrument, Interest Rate, Stated Percentage8.75% 8.75%  
Senior Notes Due 2017 [Member]
     
Debt Instrument [Line Items]     
Long-term Debt444,800,000 444,800,000 444,500,000
Debt Instrument, Interest Rate, Stated Percentage8.625% 8.625%  
Senior Subordinated Notes due 2015 [Member]
     
Debt Instrument [Line Items]     
Long-term Debt381,800,000 381,800,000 381,500,000
Debt Instrument, Interest Rate, Stated Percentage7.50% 7.50%  
Notes Payable, Other Payables [Member]
     
Debt Instrument [Line Items]     
Long-term Debt$ 700,000 $ 700,000 $ 700,000