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Pensions and Other Post-employment Benefits
 3 Months Ended
Apr. 03, 2015
Compensation and Retirement Disclosure [Abstract]  
Pensions and Other Post-employment Benefits
Pensions and Other Post-employment Benefits
The following is a summary of the net periodic benefit cost for the first quarter of 2015 and 2014 for the domestic pension plans (which include the defined benefit pension plan and the supplemental retirement plans) and the domestic retiree medical plan.
 
 
Pension Benefits
 
Other Benefits
 
 
First Quarter Ended
 
First Quarter Ended
 
 
Apr. 3,
 
Mar. 28,
 
Apr. 3,
 
Mar. 28,
(Thousands)
 
2015
 
2014
 
2015
 
2014
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
Service cost
 
$
2,230

 
$
1,936

 
$
29

 
$
34

Interest cost
 
2,500

 
2,444

 
138

 
169

Expected return on plan assets
 
(3,354
)
 
(3,013
)
 
—

 
—

Amortization of prior service cost (benefit)
 
(112
)
 
(109
)
 
(374
)
 
(374
)
Amortization of net loss
 
1,820

 
1,275

 
—

 
—

Net periodic benefit cost (benefit)
 
$
3,084

 
$
2,533

 
$
(207
)
 
$
(171
)

 
The Company made contributions to the domestic defined benefit pension plans of $4.0 million in the first quarter of 2015.

In 2014, the Company amended the domestic retiree medical plan, including changing the benefit formula for participants covered by the plan. The revised benefit formula is designed to lower costs for the Company and the majority of plan participants. As a result of this change, the plan liability on the Company's Consolidated Balance Sheet was reduced by $14.0 million in the first quarter of 2014, with the offset increasing other comprehensive income, a component of shareholders' equity. The liability reduction will be recognized in earnings over the average remaining service life of participants.