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Commitments and Contingencies - Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 4,351
2020 5,171
2021 5,158
2022 5,074
2023 4,363
Thereafter 432,813
Total 456,930
Office Lease Obligations  
Operating Leased Assets [Line Items]  
2019 2,237
2020 2,821
2021 2,719
2022 2,582
2023 1,871
Thereafter 10,644
Total 22,874
Ground Lease Obligations  
Operating Leased Assets [Line Items]  
2019 2,114
2020 2,350
2021 2,439
2022 2,492
2023 2,492
Thereafter 422,169
Total $ 434,056