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Leasing Operations (Future undiscounted, lease payments for non-cancelable tenant leases) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Leases [Abstract]  
2020 $ 335,451
2021 292,146
2022 238,559
2023 191,552
2024 144,329
Thereafter 451,531
Total $ 1,653,568