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Commitments and Contingencies - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 04, 2019 USD ($) | Sep. 30, 2019 USD ($) property | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) property | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of properties subject to ground leases | property |  | 8 |  | 8 |  |
Operating lease right-of-use asset |  | $ 49,274 |  | $ 49,274 |  |
Operating lease liability |  | $ 23,547 |  | $ 23,547 |  |
Weighted average remaining lease term |  | 33 years 3 months 18 days |  | 33 years 3 months 18 days |  |
Weighted average discount rate |  | 4.33% |  | 4.33% |  |
Payments |  | $ 300 |  | $ 1,000 |  |
Expense |  | $ 300 |  | 1,000 |  |
Rent expense |  |  | $ 400 |  | $ 1,100 |
Payments for legal settlements | $ 7,400 |  |  |  |  |
Legal settlement reserve |  |  |  |  |  | $ 7,400
Asset management fees | Service Provider | Defendants vs. Service Providers |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Legal expenses |  |  |  | $ 1,000 |  |
Minimum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Term of contract |  | 16 years |  | 16 years |  |
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Term of contract |  | 85 years |  | 85 years |  |

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