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Debt (Details) (USD $)
1 Months Ended9 Months Ended
Feb. 28, 2011
Sep. 30, 2011
Dec. 31, 2010
Current portion of long-term debt: Senior notes $ 1,200,000$ 1,200,000
Total short-term debt 1,200,0001,200,000
Variable rate (2.205% at March 31, 2011 and 0.887% at December 31, 2010) unsecured revolving credit facility, expires February 2016 599,800,000421,200,000
Long-term debt, excluding current maturities 1,271,000,0001,093,000,000
Total debt 1,272,200,0001,094,200,000
Unsecured revolving credit facility, variable rate 2.205%0.887%
Unsecured revolving credit facility, expiration dateFebruary 2016  
Unsecured revolving credit facility, borrowing capacity  1,500,000,000
Unsecured revolving credit facility, maximum borrowing capacity  2,000,000,000
Unsecured revolving credit facility, interest rate description The interest rate on the amended credit facility is calculated based upon our debt rating and is currently 200 basis points over the current London Interbank Offered Rate (LIBOR) and was 200 basis points over LIBOR at September 30, 2011. 
Unsecured revolving credit facility, covenant terms Under the credit agreement, the Company may not issue total debt in excess of 60% of its total capital and must maintain a ratio of earnings before interest, taxes, depreciation and amortization (EBITDA) to interest expense of 3.5 or above. 
Unsecured revolving credit facility, covenant compliance At September 30, 2011, the Company's capital structure consisted of 26% debt and 74% equity and it was in compliance with the covenants of its debt agreements.  
7.5% Senior Notes due 2018 [Member]
   
Long-term debt: Senior notes 600,000,000600,000,000
Debt instrument, interest rate, stated percentage 7.50% 
7.35% Senior Notes due 2017 [Member]
   
Long-term debt: Senior notes 15,000,00015,000,000
Debt instrument, interest rate, stated percentage 7.35% 
7.125% Senior Notes due 2017 [Member]
   
Long-term debt: Senior notes 25,000,00025,000,000
Debt instrument, interest rate, stated percentage 7.125% 
7.15% Senior Notes due 2018 [Member]
   
Current portion of long-term debt: Senior notes 1,200,0001,200,000
Total short-term debt 1,200,0001,200,000
Long-term debt: Senior notes $ 31,200,000$ 31,800,000
Debt instrument, interest rate, stated percentage 7.15%