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Long-Term Debt (Summary Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Nov. 15, 2010
Dec. 31, 2011
Parent [Member]
Dec. 31, 2010
Parent [Member]
Dec. 31, 2011
Notes Payable And Mortgages Payable [Member]
Dec. 31, 2010
Notes Payable And Mortgages Payable [Member]
Dec. 31, 2011
Revenue Bonds [Member]
Dec. 31, 2010
Revenue Bonds [Member]
Dec. 31, 2011
Accounts Receivable Securitization Program [Member]
Dec. 31, 2010
Accounts Receivable Securitization Program [Member]
Dec. 31, 2011
6.75% Senior Secured Notes Due 2011 [Member]
Dec. 31, 2010
6.75% Senior Secured Notes Due 2011 [Member]
Dec. 31, 2011
7.125% Senior Secured Notes due 2016 [Member]
Dec. 31, 2010
7.125% Senior Secured Notes due 2016 [Member]
Dec. 31, 2011
7.00% Senior Unsecured Notes due 2018 [Member]
Dec. 31, 2010
7.00% Senior Unsecured Notes due 2018 [Member]
Dec. 31, 2011
Term Loans With Varying Maturities [Member]
Dec. 31, 2011
Revolving Credit And Demand Notes [Member]
Dec. 31, 2010
Revolving Credit And Demand Notes [Member]
Dec. 31, 2011
Term Loan A Facility [Member]
Dec. 31, 2010
Term Loan A Facility [Member]
Nov. 15, 2010
Term Loan A Facility [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Dec. 31, 2010
Term Loan B Facility [Member]
Nov. 15, 2010
Term Loan B Facility [Member]
Debt Instrument [Line Items]                                                    
Notes payable and Mortgages payable (including obligations under capitalized leases of $9,982 in 2011 and $11,962 in 2010) and term loans with varying maturities through 2038; weighted average interest at 6.1% in 2011 and 6.5% in 2010 (see Note 7 regarding capitalized leases)           $ 51,841 $ 49,355                                      
Line of credit facility amount outstanding     3,450,000                               249,600 187,500 1,020,375 1,042,322 1,050,000 1,436,772 1,576,500 1,600,000
Revenue bonds, interest at floating rates of 0.2% and 0.3% at December 31, 2011 and 2010, respectively, with varying maturities through 2015               5,300 5,300                                  
Accounts receivable securitization program 240,000                 240,000 204,000                              
Senior Notes                         200,550 400,019 400,024 250,000 250,000                  
Long-term debt 3,653,907 3,915,551                                                
Less-Amounts due within one year (2,479) (3,449)                                                
Long-term debt, net 3,651,428 3,912,102   3,594,182 3,855,810                                          
Obligations under capital lease           9,982 11,962                                      
Weighted average interest           6.10% 6.50%                                      
Unamortized discount                         9               6,103     19,500    
Interest at floating rates               0.20% 0.30%                                  
Fair market value adjustments                         559                          
Unamortized net premium                           $ 19 $ 24                      
Interest rate                       6.75%   7.125%   7.00%                    
Debt instruments, maturity date               2015           2016   2018   2038