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Leasing Operations Future undiscounted, lease payments for non-cancelable tenant leases (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Leases [Abstract]  
2021 $ 329,001
2022 283,036
2023 239,768
2024 192,197
2025 146,270
Thereafter 448,593
Total $ 1,638,865