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Leasing Operations Future undiscounted, lease payments for non-cancelable tenant leases (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Leases [Abstract]  
2019 remaining $ 266,529
2020 321,566
2021 270,622
2022 214,807
2023 167,279
Thereafter 518,134
Total $ 1,758,937