Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
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 $ 15,214 $ 11,305
Restricted cash 1,430 6,317
Mortgage notes payable, net 97,814 148,540
Lines of credit 123,000 120,000
Notes payable, net 893,424 843,084
Carrying Value | 2445 M Street note receivable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2445 M Street note receivable 2,166 2,089
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 15,214 11,305
Restricted cash 1,430 6,317
Mortgage notes payable, net 100,702 149,997
Lines of credit 123,000 120,000
Notes payable, net 925,613 873,516
Fair Value | 2445 M Street note receivable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2445 M Street note receivable $ 2,216 $ 2,173