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Pension and other postretirement benefits (Tables)
 9 Months Ended
Sep. 28, 2014
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 28, 2014
 
September 29, 2013
 
September 28, 2014
 
September 29, 2013
 
September 28, 2014
 
September 29, 2013
 
September 28, 2014
 
September 29, 2013
 
(Dollars in thousands)
Service cost
$
453

 
$
432

 
$
42

 
$
176

 
$
1,350

 
$
1,361

 
$
318

 
$
501

Interest cost
4,548

 
4,333

 
434

 
543

 
13,517

 
12,614

 
1,627

 
2,084

Expected return on plan assets
(6,240
)
 
(5,784
)
 
—

 
—

 
(18,764
)
 
(17,328
)
 
—

 
—

Net amortization and deferral
1,143

 
1,556

 
(58
)
 
137

 
3,284

 
4,380

 
(5
)
 
1,069

Net benefit expense (income)
$
(96
)
 
$
537

 
$
418

 
$
856

 
$
(613
)
 
$
1,027

 
$
1,940

 
$
3,654