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Debt (Consolidated Debt) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Revolving credit facility $ 150,000 $ 15,000
Long-term Debt, Total 2,042,246 1,906,148
Weighted-Average Interest Rate 0.70% [1]  
6.45% Notes due 2014 [Member]
   
Notes payable 249,814 249,786
Weighted-Average Interest Rate 6.30% [1]  
5.65% Notes due 2016 [Member]
   
Notes payable 252,252 252,466
Weighted-Average Interest Rate 5.70% [1]  
6.40% Notes due 2018 [Member]
   
Notes payable 262,034 259,125
Weighted-Average Interest Rate 5.10% [1]  
6.55% Notes due 2019 [Member]
   
Notes payable 580,216 581,890
Weighted-Average Interest Rate 5.90% [1]  
4.25% Notes due 2021 [Member]
   
Notes payable 298,974 298,932
Weighted-Average Interest Rate 4.30% [1]  
6.40% Notes due 2037 [Member]
   
Notes payable $ 248,956 $ 248,949
Weighted-Average Interest Rate 6.30% [1]  
[1] Weighted-average interest rate includes the impact of outstanding interest rate swaps, the amortization/accretion of discounts and premiums and the amortization/accretion of gains and losses realized on historical cash flow and fair value hedges (see Note 9—Derivative Financial Instruments for detailed information regarding our current interest rate swaps).