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Future Minimum Rents Future minimum rent under non-cancelable operating leases (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Future minimum rent [Abstract]  
2018 $ 1,962,841
2019 1,998,102
2020 1,920,002
2021 1,783,066
2022 1,596,719
Thereafter $ 11,160,780