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Retirement Plans (Tables)
 9 Months Ended
Sep. 26, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic (benefit) expenses
The components of the net periodic expense (benefit) for the Company’s pension plans, supplemental executive retirement plans ("SERP") and other postretirement benefit plans ("OPEB") are as follows (in thousands):

 
 
For the Three Months Ended
 
For the Nine Months Ended
 
 
September 26,
2015
 
September 27,
2014
 
September 26,
2015
 
September 27,
2014
Service cost
 
$
—

 
$
—

 
$
1

 
$
1

Interest cost
 
3,505

 
3,707

 
10,553

 
11,120

Expected return on plan assets
 
(5,280
)
 
(5,206
)
 
(15,732
)
 
(15,618
)
Net amortization and deferral
 
—

 
—

 
—

 
—

Recognized net actuarial loss
 
2,339

 
794

 
6,651

 
2,381

Net periodic expense (benefit)
 
$
564

 
$
(705
)
 
$
1,473

 
$
(2,116
)