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Pension and other postretirement benefits
 6 Months Ended
Jul. 01, 2018
Retirement Benefits [Abstract]  
Pension and other postretirement benefits
Note 12 — Pension and other postretirement benefits
The Company has a number of defined benefit pension and postretirement plans covering eligible U.S. and non-U.S. employees. As of July 1, 2018, no further benefits are being accrued under the Company’s U.S. defined benefit pension plans and the Company’s other postretirement benefit plans, other than certain postretirement benefit plans covering employees subject to a collective bargaining agreement.
Net pension and other postretirement benefits expense (income) consist of the following:
 
Pension
Three Months Ended
 
Other Postretirement Benefits
Three Months Ended
 
Pension
Six Months Ended
 
Other Postretirement Benefits
Six Months Ended
 
July 1, 2018
 
July 2, 2017
 
July 1, 2018
 
July 2, 2017
 
July 1, 2018
 
July 2, 2017
 
July 1, 2018
 
July 2, 2017
 
(Dollars in thousands)
Service cost
$
376

 
$
720

 
$
52

 
$
75

 
$
754

 
$
1,437

 
$
104

 
$
149

Interest cost
3,718

 
3,789

 
378

 
379

 
7,439

 
7,574

 
756

 
757

Expected return on plan assets
(7,415
)
 
(6,750
)
 
—

 
—

 
(14,836
)
 
(13,493
)
 
—

 
—

Net amortization and deferral
1,695

 
1,691

 
62

 
66

 
3,403

 
3,381

 
124

 
131

Net benefits expense (income)
$
(1,626
)
 
$
(550
)
 
$
492

 
$
520

 
$
(3,240
)
 
$
(1,101
)
 
$
984

 
$
1,037