Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Operating Results of Acquisitions (Details)

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Real Estate - Operating Results of Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Real Estate [Line Items]    
Real estate rental revenue $ 84,881 $ 77,501
Net income 3,299 $ 6,615
Arlington Tower [Member]    
Real Estate [Line Items]    
Real estate rental revenue 4,635  
Net income $ 640