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Net Periodic Pension Cost
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Net Periodic Pension Cost Net Periodic Pension Cost
The following table shows the components of our net periodic pension cost:
 
Three Months Ended
 
Six Months Ended
(In thousands)
June 30, 2018
 
July 1, 2017
 
June 30, 2018
 
July 1, 2017
Service cost
$
133

 
$
183

 
$
266

 
$
366

Interest cost on projected benefit obligation
963

 
1,178

 
1,926

 
2,356

Expected return on plan assets
(1,327
)
 
(1,584
)
 
(2,654
)
 
(3,168
)
Amortization of unrecognized loss
271

 
268

 
542

 
536

Net periodic pension cost
$
40

 
$
45

 
$
80

 
$
90