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Retirement Plans (Tables)
 9 Months Ended
Sep. 27, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic (benefit) expenses
The components of the net periodic (benefit) expense for the Company’s pension plans, SERP and other postretirement benefit plans ("OPEB") are as follows (in thousands):

 
 
For the Three Months Ended
 
For the Nine Months Ended
 
 
September 27,
2014
 
September 28,
2013
 
September 27,
2014
 
September 28,
2013
Service cost
 
$
—

 
$
—

 
$
1

 
$
—

Interest cost
 
3,707

 
3,421

 
11,120

 
10,263

Expected return on plan assets
 
(5,206
)
 
(4,618
)
 
(15,618
)
 
(13,854
)
Net amortization and deferral
 
—

 
(2
)
 
—

 
(6
)
Recognized net actuarial loss
 
794

 
1,992

 
2,381

 
5,976

Net periodic (benefit) expense
 
$
(705
)
 
$
793

 
$
(2,116
)
 
$
2,379