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Secured and Unsecured Debt (Details 4) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Summary of short-term bank borrowings under unsecured commercial bank credit facility      
Borrowings outstanding at end of period $ 840,500    
Unsecured Commercial Bank Credit Facility [Member]
      
Summary of short-term bank borrowings under unsecured commercial bank credit facility      
Total revolving credit facility 900,000   900,000
Borrowings outstanding at end of period 170,000   76,000
Weighted average daily borrowings during the period ended 118,268 167,038  
Maximum daily borrowings during the period ended $ 184,500 $ 788,000  
Weighted average interest rate during the period ended 1.20% 1.50%  
Interest rate at the end of the period 1.20%   1.40%