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Summary of Significant Accounting Policies - Future Base Rent Payments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] |  |
2019 (remainder) | $ 71,010 |
2020 | 285,409 |
2021 | 286,619 |
2022 | 277,834 |
2023 | 255,818 |
2024 | 213,361 |
Thereafter | 788,523 |
Total | $ 2,178,574 |
Operating Leases, Future Minimum Payments Receivable [Abstract] |  |
2019 |  | $ 275,118
2020 |  | 278,651
2021 |  | 279,630
2022 |  | 270,569
2023 |  | 247,237
Thereafter |  | 856,838
Total |  | $ 2,208,043

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