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Commitments and Contingencies - Aggregate Required Payments on Ground Leases (Details) - Ground leases
$ in Thousands
Sep. 30, 2018
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 380
2019 1,518
2020 1,518
2021 1,518
2022 1,518
Thereafter 69,816
Aggregate required payments on ground leases $ 76,268