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Fair Value Disclosures - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 11,326 $ 11,305
Restricted cash 1,442 6,317
Mortgage notes payable, net 96,045 148,540
Lines of credit 189,000 120,000
Notes payable, net 894,103 843,084
Carrying Value | 2445 M Street note receivable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2445 M Street note receivable 2,005 2,089
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 11,326 11,305
Restricted cash 1,442 6,317
Mortgage notes payable, net 98,892 149,997
Lines of credit 189,000 120,000
Notes payable, net 932,766 873,516
Fair Value | 2445 M Street note receivable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2445 M Street note receivable $ 2,194 $ 2,173