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Commitments and Contingencies - Lease Payments on Non-cancelable Leases (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Present value of operating lease liabilities | $ 22,453 | $ 22,400 | $ 0
2019 |  |  | 1,222
2020 |  |  | 1,222
2021 |  |  | 1,222
2022 |  |  | 1,222
2023 |  |  | 1,222
Thereafter |  |  | 55,689
Total |  |  | $ 61,799
Adoption of Topic 842 [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
2019 (six months remaining) | 605 |  |
2020 | 1,217 |  |
2021 | 1,232 |  |
2022 | 1,248 |  |
2023 | 1,263 |  |
Thereafter | 111,757 |  |
Total lease payments | 117,322 |  |
Less: Imputed interest | (94,869) |  |
Present value of operating lease liabilities | $ 22,453 |  |

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