Quarterly report pursuant to Section 13 or 15(d)

Fair Value Disclosures - Financial Assets and Liabilities Not Measured at Fair Value (Details)

v3.3.0.814
Fair Value Disclosures - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commercial paper, maturity 90  
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 21,012 $ 15,827
Restricted cash 12,544 10,299
Mortgage notes payable 419,293 418,525
Lines of credit 195,000 50,000
Notes payable 747,540 747,208
Carrying Value | 2445 M Street Note Receivable [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2445 M Street note 4,940 4,404
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 21,012 15,827
Restricted cash 12,544 10,299
Mortgage notes payable 434,581 433,762
Lines of credit 195,000 50,000
Notes payable 781,641 782,042
Fair Value | 2445 M Street Note Receivable [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2445 M Street note $ 5,160 $ 5,113