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Post-Retirement Health Care
 6 Months Ended
Jun. 30, 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
 
Six Months Ended
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Service cost
$
213

 
$
186

 
$
426

 
$
371

Interest cost
197

 
206

 
394

 
412

Amortization of net (gain) loss
26

 
6

 
63

 
13

Net periodic post-retirement benefit cost
$
436

 
$
398

 
$
883

 
$
796