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Post-Retirement Health Care
 9 Months Ended
Sep. 30, 2017
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
 
Nine Months Ended
 
 
September 30,
2017
 
October 1,
2016
 
September 30,
2017
 
October 1,
2016
Service cost
 
$
185

 
$
184

 
$
556

 
$
552

Interest cost
 
206

 
212

 
619

 
634

Amortization of (gain)/loss
 
6

 
16

 
19

 
46

Net periodic benefit cost
 
$
397

 
$
412

 
$
1,194

 
$
1,232