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Unsecured Debt (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Jan. 10, 2012
Dec. 31, 2011
Summary of unsecured debt      
Borrowings outstanding at end of period $ 800,000    
Senior Unsecured Notes 1,902,707   1,605,817
Unsecured Debt, Total 1,902,707   2,026,817
Unamortized discount 19,500   24,100
Unsecured Revolving Credit Facility due October 2015 [Member]
      
Summary of unsecured debt      
Borrowings outstanding at end of period 0 [1],[2]   421,000 [1],[2]
4.63% Medium-Term Notes due January 2022 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 396,580 [2],[3]   0 [2],[3]
Fixed interest rate 4.625% 4.625%  
Unamortized discount 3,420    
1.67% Term Notes due December 2016 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 35,000 [2],[4]   100,000 [2],[4]
Fixed interest rate 1.67%   1.67%
2.68% Term Notes due December 2016 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 65,000 [2],[4]   0 [2],[4]
Fixed interest rate 2.68%    
6.05% Medium-Term Notes due June 2013 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 122,500   122,500
Fixed interest rate 6.05%   6.05%
5.13% Medium-Term Notes due January 2014 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 184,000   184,000
Fixed interest rate 5.13%   5.13%
5.50% Medium-Term Notes due April 2014 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 128,377   128,343
Fixed interest rate 5.50%   5.50%
Unamortized discount 123   157
5.25% Medium-Term Notes due January 2015 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 324,848   324,785
Fixed interest rate 5.25%   5.25%
Unamortized discount 327   390
5.25% Medium-Term Notes due January 2016 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 83,260   83,260
Fixed interest rate 5.25%   5.25%
Three Point Four Eight Percent Term Notes Due January 2016 [Member]
      
Summary of unsecured debt      
Fixed interest rate 2.90%   2.90%
2.90% Term Notes due January 2016 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 250,000 [2]   250,000 [2]
8.50% Debentures due September 2024 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 15,644   15,644
Fixed interest rate 8.50%   8.50%
4.25% Medium-Term Notes due June 2018 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 297,464 [2]   297,249 [2]
Fixed interest rate 4.25%   4.25%
Unamortized discount 2,536   2,751
5.00% Medium-Term Notes due January 2012 [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes 0   100,000
Fixed interest rate     5.00%
Others [Member]
      
Summary of unsecured debt      
Senior Unsecured Notes $ 34   $ 36
[1] The Company has a $900 million unsecured revolving credit facility. The unsecured credit facility has an initial term of four years and includes a one-year extension option. It contains an accordion feature that allows the Company to increase the facility to $1.35 billion. The credit facility carries an interest rate equal to LIBOR plus a spread of 122.5 basis points and a facility fee of 22.5 basis points.
[2] The Operating Partnership is a guarantor at June 30, 2012 and December 31, 2011.
[3] On January 10, 2012, the Company issued $400 million aggregate principal amount of 4.625% Medium Term Notes due January 2022. Interest is payable semiannually beginning in July 2012. The notes were priced at 99.100% of the principal amount plus accrued interest from January 10, 2012 to yield 4.739% to maturity. The notes are fully and unconditionally guaranteed by the Operating Partnership.
[4] During the three months ended June 30, 2012, the Company entered into an interest rate swap agreement for a portion of the $100 million term notes, which carries a fixed interest rate of 2.68% at June 30, 2012.