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Income Taxes Income Taxes (Tables)
6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Provision
The following table summarizes the Corporation's income tax provision (dollars in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Income before income taxes
$
24,431

 
$
20,627

 
$
25,893

 
$
27,586

Income taxes
$
5,835

 
$
6,771

 
$
4,836

 
$
8,949

Effective tax rate
23.9
%
 
32.8
%
 
18.6
%
 
32.4
%