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Operating Leases - Minimum Future Rentals on Non-cancelable Leases of Company properties leased to Tenants (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract]  
2017 $ 374,726
2018 370,439
2019 341,956
2020 311,075
2021 271,870
Thereafter $ 1,292,599