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Commitments and Contingencies - Future Obligations (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Ground Leases [Member]  
Operating Leased Assets [Line Items]  
2018 $ 14,523
2019 14,467
2020 14,350
2021 13,721
2022 13,935
Thereafter 211,514
Total 282,510
Office Leases [Member]  
Operating Leased Assets [Line Items]  
2018 4,394
2019 4,359
2020 4,389
2021 4,368
2022 4,419
Thereafter 3,995
Total $ 25,924