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Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Parenthetical) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]    
Other liabilities $ 42,841 $ 31,379
evo at Cira Centre South Venture [Member]    
Segment Reporting Information [Line Items]    
Net increase of investment in unconsolidated real estate ventures $ 6,500  
Coppell Associates [Member]    
Segment Reporting Information [Line Items]    
Other liabilities   $ 1,100