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Income Taxes (Tables)
9 Months Ended
Sep. 29, 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
 
Nine Months Ended
 
September 29,
2018
 
September 30,
2017
 
September 29,
2018
 
September 30,
2017
Income before income taxes
$
51,104

 
$
55,955

 
$
76,997

 
$
83,541

Income taxes
$
11,197

 
$
18,624

 
$
16,033

 
$
27,573

Effective tax rate
21.9
%
 
33.3
%
 
20.8
%
 
33.0
%