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Long-Term Debt (Unsecured Revolving Credit Facility) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Euro Dollar Rate [Member]
Jun. 30, 2012
Base Rate [Member]
Sep. 09, 2011
Unsecured Debt [Member]
Line of Credit Facility [Member]
Jan. 14, 2011
Unsecured Debt [Member]
Line of Credit Facility [Member]
Jun. 30, 2012
Unsecured Debt [Member]
Line of Credit Facility [Member]
Dec. 31, 2011
Unsecured Debt [Member]
Line of Credit Facility [Member]
Sep. 09, 2011
Unsecured Debt [Member]
Line of Credit Facility [Member]
Letter of Credit [Member]
Sep. 09, 2011
Unsecured Debt [Member]
Line of Credit Facility [Member]
Swing Line Revolver [Member]
Sep. 09, 2011
Unsecured Debt [Member]
Line of Credit Facility [Member]
Through December 2012 [Member]
Sep. 09, 2011
Unsecured Debt [Member]
Line of Credit Facility [Member]
Through December 2014 [Member]
Sep. 09, 2011
Unsecured Debt [Member]
Line of Credit Facility [Member]
Through Maturity [Member]
Credit agreement inception date         Jan. 14, 2011              
Number of years in credit facility term       5                
Current maximum borrowing capacity under credit facility       $ 660                
Credit agreement amendment date       Sep. 09, 2011                
Line of credit facility expiration date       Sep. 09, 2016                
Maximum aggregate increase to credit facility       200                
Line of credit facility sublimit               200 75      
Letters of credit           57.8 59.9          
Outstanding borrowings under credit facility           $ 0 $ 0          
Line of credit current interest rate   1.20% 0.20%                  
Line of credit facility fee percentage 0.175%                      
Covenant description for debt instrument       The Credit Agreement contains certain covenants, which include limitations on indebtedness, a minimum fixed charge coverage ratio of 2.00 times through December 31, 2012; 2.25 times thereafter through December 31, 2014; and 2.50 times thereafter through maturity; and a maximum adjusted consolidated leverage ratio of 3.00 times through maturity. The consolidated leverage ratio includes a calculation of adjusted earnings before interest, taxes, depreciation, amortization, rent and stock-based compensation expense to adjusted debt. Adjusted debt includes, without limitation, outstanding debt, outstanding letters of credit and six-times rent expense and excludes any premium or discount recorded in conjunction with the issuance of long-term debt. In the event that the Company should default on any covenant contained within the Credit Agreement, certain actions may be taken, including, but not limited to, possible termination of credit extensions, immediate acceleration of outstanding principal amounts plus accrued interest and other amounts payable under the Credit Agreement and litigation from lenders.                
Line of credit facility covenant compliance           As of June 30, 2012, the Company remained in compliance with all covenants under the Credit Agreement.            
Minimum debt instrument consolidated fixed charge coverage ratio covenant                   2.00 2.25 2.50
Maximum debt instrument consolidated leverage ratio covenant                       3.00