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Debt (Details) (USD $)
9 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2012
Jan. 01, 2012
May 30, 2008
2015 Notes [Member]
Sep. 30, 2012
2015 Notes [Member]
Oct. 25, 2011
2021 Notes [Member]
Sep. 30, 2012
2021 Notes [Member]
Jan. 01, 2012
2021 Notes [Member]
Sep. 30, 2012
Financing Lease Obligations [Member]
Sep. 30, 2012
Unsecured Revolving Credit Facility [Member]
Sep. 30, 2012
Unsecured Revolving Credit Facility [Member]
Eurocurrency Rate [Member]
Sep. 30, 2012
Unsecured Revolving Credit Facility [Member]
Base Rate Option Two [Member]
Oct. 25, 2011
Issuance of Debt [Member]
2021 Notes [Member]
Unsecured revolving credit facility, amount $ 700,000,000                      
Unsecured revolving credit facility, expiry date December 16, 2016                      
Letters of credit issued and outstanding                 12,000,000      
Interest rate terms under amended senior unsecured revolving credit facility                 The interest rates under the senior unsecured revolving credit facility are based on the Eurocurrency rate at the time of borrowing plus a margin, or the base rate from time to time. The base rate is the higher of (i) the rate of interest in effect for such day as publicly announced from time to time by Bank of America, N.A. as its "prime rate," (ii) the Federal Funds rate plus 50 basis points or (iii) one-month Libor plus 1.00%.      
Weighted average interest rates under amended senior unsecured revolving credit facility                 The Eurocurrency margin as of September 30, 2012 was 130 basis points. The weighted average Eurocurrency interest rate as of September 30, 2012 was 0.22%, resulting in a weighted average effective Eurocurrency rate, including the margin, of 1.52%.      
Description of variable rate basis                   Eurocurrency Federal Funds  
Basis spread on variable rate                   1.30% 0.50%  
Weighted average Eurocurrency interest rate                   0.22%    
Weighted average effective Eurocurrency rate, including the margin                   1.52%    
Aggregate borrowings under the amended facility 256,000,000 298,000,000                    
Unsecured senior notes, interest rate percent     6.00%   5.00%              
Unsecured senior notes, face value     150,000,000 150,000,000 500,000,000 500,000,000            
Gross proceeds from the issuance of debt instrument     150,000,000   496,900,000              
Senior unsecured notes issuance as percentage of principal amount         99.372%              
Debt Instrument, Unamortized Discount         3,100,000 2,900,000 3,100,000          
Debt instrument maturity date     May 30, 2015   Nov. 25, 2021              
Percentage of redemption of senior notes on or after August 15, 2021                       100.00%
Percentage of redemption upon a change of control and a contemporaneous downgrade of the Notes         101.00%              
Other Long-term Debt               29,300,000        
Maximum Additional Financing Lease Obligations               15,000,000        
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months               600,000        
Long-term Debt, Maturities, Repayments of Principal in Year Two               1,700,000        
Long-term Debt, Maturities, Repayments of Principal in Year Three               2,600,000        
Long-term Debt, Maturities, Repayments of Principal in Year Four               2,600,000        
Long-term Debt, Maturities, Repayments of Principal in Year Five               2,600,000        
Long-term Debt, Maturities, Repayments of Principal after Year Five               $ 27,000,000