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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Tax Contingency [Line Items]          
Effective rate of income tax 13.70% 17.60% 14.80% 15.90%  
U.K. statutory tax rate     19.00%    
Income tax benefit $ 5,385 $ 7,865 $ 17,466 $ 18,582  
Deferred tax asset 1,406   1,406   $ 1,754
Subsidiaries          
Income Tax Contingency [Line Items]          
Deferred tax asset $ 1,400   $ 1,400