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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |
Effective rate of income tax (percentage) | 14.40% | 11.00% |
U.K. statutory tax rate (percentage) | 19.00% |  |
Income tax benefit | $ 5,724 | $ 3,696 |
Deferred tax asset | 2,034 |  | $ 1,754
Subsidiaries |  |  |
Income Tax Contingency [Line Items] |  |  |
Deferred tax asset | $ 2,000 |  |

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