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, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net $ 6,200 $ 6,900
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents(1) 130,343 [1] 19,324 [1]
Restricted cash(1) 9,189 [1] 14,582 [1]
Mortgage notes payable (1) 294,671 [1] 342,970 [1]
Notes payable 846,703 906,190
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents(1) 130,343 [1] 19,324 [1]
Restricted cash(1) 9,189 [1] 14,582 [1]
Mortgage notes payable (1) 313,476 [1] 374,591 [1]
Notes payable 856,171 968,040
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 6,803 6,654
2445 M Street [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net $ 6,070 $ 6,617
[1] Includes amounts that have been reclassified to "Other asset related to properties sold or held for sale" or "Other liabilities related to properties sold or held for sale" on the consolidated balance sheets (see note 3).