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Real Estate Properties - Schedule of Future Minimum Lease Payment Receivables and Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Future minimum lease payments receivable:  
2019 $ 109,888
2020 96,309
2021 104,279
2022 95,128
2023 86,299
Thereafter 567,547
Total $ 1,059,450