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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]        
Income tax expense $ 1,913 $ 14,049 $ 4,654 $ 10,641