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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Tax Disclosure [Abstract]          
Effective rate of income tax (percentage) 17.60% 14.50% 15.90% 12.00%  
U.K. statutory tax rate (percentage)     19.00%    
Income tax benefit $ 7,865 $ 4,598 $ 18,582 $ 11,294  
Deferred tax asset $ 410   $ 410   $ 410