Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Revenue and Earnings of Acquisitions (Details)

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Real Estate - Revenue and Earnings of Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Real Estate [Line Items]        
Real estate rental revenue $ 83,456 $ 79,405 $ 160,957 $ 156,542
Net income $ 7,847 $ 31,821 14,462 $ 34,200
Series of Individually Immaterial Business Acquisitions [Member]        
Real Estate [Line Items]        
Real estate rental revenue     4,902  
Net income     $ 964