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Pension and other postretirement benefits (Tables)
 9 Months Ended
Sep. 27, 2015
Compensation and Retirement Disclosure [Abstract]  
Net Benefit Cost of Pension and Postretirement Benefit Plans
Net benefit cost of pension and postretirement benefit plans consisted of the following:
 
 
Pension
Three Months Ended
 
Other Postretirement Benefits
Three Months Ended
 
Pension
Nine Months Ended
 
Other Postretirement Benefits
Nine Months Ended
 
September 27, 2015
 
September 28, 2014
 
September 27, 2015
 
September 28, 2014
 
September 27, 2015
 
September 28, 2014
 
September 27, 2015
 
September 28, 2014
 
(Dollars in thousands)
Service cost
$
470

 
$
453

 
$
157

 
$
42

 
$
1,410

 
$
1,350

 
$
371

 
$
318

Interest cost
4,492

 
4,548

 
$
452

 
434

 
13,463

 
13,517

 
1,476

 
1,627

Expected return on plan assets
(6,606
)
 
(6,240
)
 
$
—

 
—

 
(19,457
)
 
(18,764
)
 
—

 
—

Net amortization and deferral
1,563

 
1,143

 
$
8

 
(58
)
 
4,620

 
3,284

 
162

 
(5
)
Net benefit expense (income)
$
(81
)
 
$
(96
)
 
$
617

 
$
418

 
$
36

 
$
(613
)
 
$
2,009

 
$
1,940