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Investments in Real Estate - Investments in Existing Properties (Details) - Investments in existing properties - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Investments in real estate properties    
Improvements $ 11,000 $ 12,300
Re-leasing costs 1,900 2,800
Recurring capital expenditures 577 529
Nonrecurring building improvements $ 8,500 $ 8,900