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Income Taxes (Income Tax Expense) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Current income tax expense | $ 36,002 | $ 48,256 | $ 840
Deferred income tax expense (benefit) | (15,832) | 7,614 | 52,923
Income tax expense, as reported | $ 20,170 | $ 55,870 | $ 53,763
Effective tax rate | 5.70% | 11.20% | 10.60%

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