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Summary of Significant Accounting Policies: (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
count
M
Dec. 31, 2010
Dec. 31, 2009
Cash and Cash Equivalents and Restricted Cash:      
Maximum term of original maturity to classify instruments as cash equivalents (in months) 3    
Revenues      
Increase in rental revenue due to straight-line rent adjustment $ 5,116 $ 4,854 $ 5,069
Investment in unconsolidated joint ventures      
Threshold ownership percentage above which to use equity method of accounting only if no controlling financial interest 50.00%    
Acquisitions      
Number of forms of in-place operating lease intangible assets and liabilities (in counts) 3    
Minimum
      
Revenues      
Management fees as a percentage of gross monthly rental revenue 1.50%    
Deferred Charges:      
Deferred lease costs, amortization period (in years) 1    
Deferred financing costs, amortization period (in years) 1    
Leasing commissions and legal costs, amortization period (in years) 5    
Maximum
      
Revenues      
Management fees as a percentage of gross monthly rental revenue 5.00%    
Deferred Charges:      
Deferred lease costs, amortization period (in years) 15    
Deferred financing costs, amortization period (in years) 15    
Leasing commissions and legal costs, amortization period (in years) 10    
Buildings and improvements | Minimum
      
Useful life of assets      
Estimated useful lives of assets (in years) 5    
Buildings and improvements | Maximum
      
Useful life of assets      
Estimated useful lives of assets (in years) 40    
Tenant improvements | Minimum
      
Useful life of assets      
Estimated useful lives of assets (in years) 5    
Tenant improvements | Maximum
      
Useful life of assets      
Estimated useful lives of assets (in years) 7    
Equipment and furnishings | Minimum
      
Useful life of assets      
Estimated useful lives of assets (in years) 5    
Equipment and furnishings | Maximum
      
Useful life of assets      
Estimated useful lives of assets (in years) 7