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Commitments and Contingencies - Operating Leases Future Minimum Payments (Details) $ in Thousands | Mar. 31, 2019 $ / € | Mar. 31, 2019 USD ($) | Mar. 31, 2019 $ / £ | Dec. 31, 2018 $ / € | Dec. 31, 2018 USD ($) | Dec. 31, 2018 $ / £ | Dec. 31, 2018 £ / $ | Dec. 31, 2018 € / $
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Operating Lease Liabilities, Payments Due [Abstract] |  |  |  |  |  |  |  |
2019 (remainder) |  | $ 1,008 |  |  |  |  |  |
2020 |  | 1,344 |  |  |  |  |  |
2021 |  | 1,344 |  |  |  |  |  |
2022 |  | 1,344 |  |  |  |  |  |
2023 |  | 1,344 |  |  |  |  |  |
2024 |  | 1,348 |  |  |  |  |  |
Thereafter |  | 38,382 |  |  |  |  |  |
Total minimum lease payments |  | 46,114 |  |  |  |  |  |
Less: Effects of discounting |  | (22,397) |  |  |  |  |  |
Total present value of lease payments |  | $ 23,717 |  |  |  |  |  |
Foreign currency exchange rate (gbp, eur per usd) | 1.12 |  | 1.30 | 1.14 |  | 1.27 | 1.27 | 1.14
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |
2019 |  |  |  |  | $ 1,371 |  |  |
2020 |  |  |  |  | 1,371 |  |  |
2021 |  |  |  |  | 1,371 |  |  |
2022 |  |  |  |  | 1,371 |  |  |
2023 |  |  |  |  | 1,371 |  |  |
Thereafter |  |  |  |  | 40,519 |  |  |
Total minimum lease payments |  |  |  |  | 47,374 |  |  |
Less: Effects of discounting |  |  |  |  | (23,370) |  |  |
Total present value of lease payments |  |  |  |  | $ 24,004 |  |  |

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