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Mortgage Notes Payable: (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Future maturities of mortgage notes payable    
Debt premium, net $ 7,841 $ (534)
Total 3,328,438 3,259,475
Mortgage notes payable
   
Future maturities of mortgage notes payable    
2012 442,005  
2013 1,007,720  
2014 106,275  
2015 642,423  
2016 573,078  
Thereafter 549,096  
Long term debt including debt premium 3,320,597  
Debt premium, net (7,841)  
Total $ 3,328,438