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Secured and unsecured senior debt (Details 3) (USD $)
In Millions, unless otherwise specified
1 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended
Apr. 30, 2012
Sep. 30, 2012
Feb. 29, 2012
Unsecured senior notes payable, due April 1, 2022
Sep. 30, 2012
Unsecured senior notes payable, due April 1, 2022
Sep. 30, 2012
Unsecured senior notes payable, due April 1, 2022
Requirement
Less than or equal to
Sep. 30, 2012
Unsecured senior notes payable, due April 1, 2022
Requirement
Greater than or equal to
Feb. 29, 2012
2012 Unsecured Bank Term Loan
Jun. 30, 2011
2012 Unsecured Bank Term Loan
Unsecured senior notes payable                
Principal amount raised     $ 550          
Stated interest rate (as a percent)     4.60% 4.60%        
Price as a percentage of principal amount of notes payable     99.915%          
Yield rate (as a percent)     4.61%          
Ownership interest in subsidiary (as a percent)   100.00% 100.00%          
Prepayment of outstanding principal balance $ 1.0           $ 250.0 $ 500.0
Requirements of the key financial covenants under our unsecured senior notes payable                
Total Debt to Total Assets (as a percent)         60.00%      
Consolidated EBITDA to interest expense (as a percent)           150.00%    
Unencumbered total asset value to unsecured debt (as a percent)           150.00%    
Secured debt to total assets (as a percent)         40.00%