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Pension and other postretirement benefits (Tables)
 3 Months Ended
Mar. 27, 2016
Compensation and Retirement Disclosure [Abstract]  
Net Benefit Cost of Pension and Postretirement Benefit Plans
The following table provides summarized information regarding net benefits expense (income), measured as of March 27, 2016 and March 29, 2015:
 
 
Pension
Three Months Ended
 
Other Postretirement Benefits
Three Months Ended
 
March 27, 2016
 
March 29, 2015
 
March 27, 2016
 
March 29, 2015
 
(Dollars in thousands)
Service cost
$
652

 
$
471

 
$
111

 
$
107

Interest cost
3,920

 
4,486

 
406

 
512

Expected return on plan assets
(6,198
)
 
(6,425
)
 
—

 
—

Net amortization and deferral
1,579

 
1,530

 
57

 
77

Net benefits expense (income)
$
(47
)
 
$
62

 
$
574

 
$
696