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Investments in Real Estate - Investments in Existing Properties (Details) - Investments in existing properties - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Investments in real estate properties    
Improvements $ 6,100 $ 5,600
Re-leasing costs 1,000 2,500
Recurring capital expenditures 172 147
Nonrecurring building improvements $ 4,900 $ 3,000