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Fair Value Disclosures (Financial Assets And Liabilities Not Measured At Fair Value) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, carrying value$ 40,751$ 78,767$ 262,413$ 11,203
Restricted cash, carrying value23,26720,486  
Mortgage notes payable428,909361,860  
Lines of credit payable, carrying value193,000100,000  
Notes payable, carrying value657,378753,587  
Cash and cash equivalents, fair value40,75178,767  
Restricted cash, fair value23,26720,486  
Mortgage notes payable, fair value463,801380,360  
Lines of credit payable, fair value193,000100,000  
Notes payable, fair value726,957785,637  
2445 M Street Note Receivable [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2445 M Street note receivable, carrying value6,8447,090  
2445 M Street note receivable, fair value$ 7,807$ 8,048