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Debt Level 4 (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Debt Instrument [Line Items]      
Bank credit facility due March 2016 $ 65,000,000 $ 0  
Total debt 1,884,670,000 1,854,882,000  
Less current maturities (23,554,000) (22,502,000)  
Total long-term debt 1,861,116,000 1,832,380,000  
Debt, Weighted Average Interest Rate 6.69% 6.80%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 89.00% 93.00%  
2012 23,554,000    
2013 27,299,000    
2014 207,708,000    
2015 176,448,000    
2016 270,653,000    
2017 and thereafter 1,179,008,000    
Line of Credit Facility, Maximum Borrowing Capacity 500,000,000 400,000,000  
Letters of Credit, Maximum Borrowing Capacity   175,000,000  
Interest Paid 129,105,000 125,138,000 122,224,000
Payments in 2012 126,225,000    
Payments in 2013 125,678,000    
Payments in 2014 121,951,000    
Payments in 2015 104,370,000    
Payments in 2016 89,578,000    
Payments in 2017 and thereafter 302,520,000    
Unsecured Debt [Member]
     
Debt Instrument [Line Items]      
Unamortized pricing discounts and other (4,888,000) (6,106,000)  
Unsecured Debt [Member] | February 2013 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 4,757,000 8,557,000  
Unsecured Debt [Member] | October 2014 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 180,692,000 180,692,000  
Unsecured Debt [Member] | April 2015 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 136,465,000 157,250,000  
Unsecured Debt [Member] | April 2016 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 197,377,000 212,927,000  
Unsecured Debt [Member] | June 2017 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 295,000,000 295,000,000  
Unsecured Debt [Member] | October 2018 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 250,000,000 250,000,000  
Unsecured Debt [Member] | May 2019 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 250,000,000 250,000,000  
Unsecured Debt [Member] | November 2021 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 150,000,000 150,000,000  
Unsecured Debt [Member] | April 2027 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 200,000,000 200,000,000  
Capital Lease Obligations [Member]
     
Debt Instrument [Line Items]      
Obligations under capital leases 124,330,000 118,339,000  
Mortgages [Member]
     
Debt Instrument [Line Items]      
Mortgage notes and other debt, maturities through 2047 $ 35,937,000 $ 38,223,000