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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]  
Summary Of Provision For Income Taxes six months ended June 30, 2020 and June 30, 2019:
For the Three Months
Ended June 30,
For the Six Months
Ended June 30,
2020201920202019
(Dollars in thousands)
Tax expense$19,788  $37,767  $43,734  $70,185  
Pretax income112,564  234,135  258,778  463,989  
Effective tax rates17.6 %16.1 %16.9 %15.1 %