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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]  
Income Tax Expense From Continuing Operations And The Effective Tax Rate
The following table presents income tax expense and the effective tax rate:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
(Dollars in thousands)
Income tax expense
$
34,692

 
$
29,486

 
$
104,227

 
$
88,565

Effective tax rate
23
%
 
24
%
 
24
%
 
24
%