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Post-Retirement Health Care
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Post-Retirement Health Care
Post-Retirement Health Care

The following table sets forth the components of net periodic benefit costs included in the Condensed Consolidated Statements of Comprehensive Income (in thousands):
 
Three Months Ended
 
March 31,
2018
 
April 1,
2017
Service cost
$
213

 
$
185

Interest cost
197

 
206

Amortization of net (gain) loss
37

 
7

Net periodic post-retirement benefit cost
$
447

 
$
398