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Fair Value Disclosures (Financial Assets and Liabilities Not Measured at Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying Value $ 17,809 $ 12,765 $ 12,480 $ 78,767
Restricted cash, Carrying Value 21,922 19,424    
Mortgage notes payable, Carrying Value 426,485 427,710    
Lines of credit payable, Carrying Value 109,000 99,000    
Notes payable, Carrying Value 657,562 657,470    
Cash and cash equivalents, Fair Value 17,809 12,765    
Restricted cash, Fair Value 21,922 19,424    
Mortgage notes payable, Fair Value 459,766 463,238    
Lines of credit payable, Fair Value 109,000 99,000    
Notes Payable, Fair Value 694,327 713,797    
2445 M Street Note Receivable [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
2445 M Street note receivable, Carrying Value 7,111 6,975    
2445 M Street note receivable, Fair Value $ 7,633 $ 7,721