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Commitments and Contingencies - Aggregate Required Payments on Ground Leases (Details) - Ground leases
$ in Thousands
Mar. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 1,138
2019 1,518
2020 1,518
2021 1,518
2022 1,518
Thereafter 53,694
Aggregate required payments on ground leases $ 60,904