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Long-Term Debt (Long-Term Debt) (Details) (USD $)
1 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended
Mar. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Sep. 30, 2011
AR Credit Facility [Member]
Sep. 30, 2011
6.6% Senior Notes, Due 2018 [Member]
Dec. 31, 2010
6.6% Senior Notes, Due 2018 [Member]
Sep. 30, 2010
6.6% Senior Notes, Due 2018 [Member]
Sep. 30, 2011
7% Debentures, Due 2025 [Member]
Dec. 31, 2010
7% Debentures, Due 2025 [Member]
Sep. 30, 2010
7% Debentures, Due 2025 [Member]
Sep. 30, 2011
6.25% Senior Notes, Due 2037 [Member]
Dec. 31, 2010
6.25% Senior Notes, Due 2037 [Member]
Sep. 30, 2010
6.25% Senior Notes, Due 2037 [Member]
Sep. 30, 2011
6.875% Notes, Due 2011 [Member]
Apr. 30, 2011
6.875% Notes, Due 2011 [Member]
Dec. 31, 2010
6.875% Notes, Due 2011 [Member]
Sep. 30, 2010
6.875% Notes, Due 2011 [Member]
Sep. 30, 2011
Term Loan Facility, Due 2015, Interest Rate Of 1.99% At September 30, 2011 [Member]
Sep. 30, 2011
Term Loan, Due 2012, Interest Rate Of 3.29% At December 31, 2010 [Member]
Dec. 31, 2010
Term Loan, Due 2012, Interest Rate Of 3.29% At December 31, 2010 [Member]
Sep. 30, 2010
Term Loan, Due 2012, Interest Rate Of 3.29% At December 31, 2010 [Member]
Sep. 30, 2011
Revolving Facility, Interest Rate Of 1.61% At September 30, 2011 [Member]
Sep. 30, 2011
AR Credit Facility, Interest Rate Of 1.60% At September 30, 2011 [Member]
Sep. 30, 2011
Other Notes [Member]
Dec. 31, 2010
Other Notes [Member]
Sep. 30, 2010
Other Notes [Member]
Total debt $ 1,045,485,000$ 1,030,759,000$ 1,031,129,000 $ 298,428,000$ 298,288,000$ 298,242,000$ 124,411,000$ 124,393,000$ 124,388,000$ 247,906,000$ 247,882,000$ 247,874,000  $ 242,129,000$ 242,118,000$ 250,000,000 $ 111,750,000$ 111,750,000     
Credit Facility    100,000,000                 20,000,000100,000,000   
Other notes                        4,740,0006,317,0006,757,000
Less current maturities (7,150,000)(248,714,000)(245,423,000)                       
Long-term debt $ 1,038,335,000$ 782,045,000$ 785,706,000                       
Interest rate on notes     6.60%  7.00%  6.25%  6.875%6.875%           
Interest rate on term loan                  1.99%3.29%       
Maturity dateMarch 31, 2015April 20, 2012   2018  2025  2037  2011   20152012       
Credit Facility interest rate                      1.61%1.60%