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Operating Leases - Minimum Future Rentals on Non-cancelable Leases of Company properties leased to Tenants (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract]  
2019 $ 392,058
2020 372,619
2021 349,160
2022 304,445
2023 277,388
Thereafter $ 1,265,810