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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Summary Of Provision For Income Taxes
The following tables summarize the provision for income taxes for the three months ended March 31, 2019 and March 31, 2018:
 
For the Three Months
Ended March 31,
 
2019
 
2018
 
(Dollars in thousands)
 
 
Tax expense
$
32,418

 
$
28,643

Pretax income
229,854

 
250,690

Effective tax rates
14.1
%
 
11.4
%