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Pension and other postretirement benefits (Tables)
 6 Months Ended
Jul. 02, 2017
Compensation and Retirement Disclosure [Abstract]  
Net Benefit Cost of Pension and Postretirement Benefit Plans
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 2, 2017
 
June 26, 2016
 
July 2, 2017
 
June 26, 2016
 
July 2, 2017
 
June 26, 2016
 
July 2, 2017
 
June 26, 2016
 
(Dollars in thousands)
Service cost
$
720

 
$
655

 
$
75

 
$
111

 
$
1,437

 
$
1,307

 
$
149

 
$
222

Interest cost
3,789

 
3,929

 
379

 
407

 
7,574

 
7,849

 
757

 
813

Expected return on plan assets
(6,750
)
 
(6,199
)
 
—

 
—

 
(13,493
)
 
(12,397
)
 
—

 
—

Net amortization and deferral
1,691

 
1,577

 
66

 
57

 
3,381

 
3,156

 
131

 
114

Net benefits expense (income)
$
(550
)
 
$
(38
)
 
$
520

 
$
575

 
$
(1,101
)
 
$
(85
)
 
$
1,037

 
$
1,149