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Pension and Other Post-Retirement Benefit Plans Employee Benefits (Tables)
3 Months Ended
Mar. 28, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The following table provides the components of net periodic cost (benefit) for the Company’s pension and other post-retirement benefit plans:
 
Pension Plans
 
Other Post-Retirement Benefit Plans
 
March 28, 2015
 
March 29, 2014
 
March 28, 2015
 
March 29, 2014
 
(in thousands)
Service cost
$
935


$
842

 
$
214


$
189

Interest cost
3,070


3,211

 
265


252

Expected return on plan assets
(4,382
)

(4,278
)
 



Amortization of prior service cost (credit)
(151
)

(159
)
 


165

Amortization of net loss
812


223


68


63

Net periodic cost (benefit)
$
284


$
(161
)

$
547


$
669