Annual report pursuant to Section 13 and 15(d)

Fair Value Disclosures (Financial Assets And Liabilities Not Measured At Fair Value) (Details)

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Fair Value Disclosures (Financial Assets And Liabilities Not Measured At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net $ 7,297 $ 7,348
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 19,324 12,765
Restricted cash 14,582 19,229
Mortgage notes payable 342,970 423,291
Lines of credit payable 0 99,000
Notes payable 906,190 657,470
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 19,324 12,765
Restricted cash 14,582 19,229
Mortgage notes payable 374,591 458,663
Lines of credit payable 0 99,000
Notes payable 968,040 713,797
Estimate of Fair Value, Fair Value Disclosure [Member] | 2445 M Street Note Receivable [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2445 M Street note receivable $ 6,654 $ 7,721