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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost (Income)
The components of net periodic benefit cost (income) are as follows:

 
 
For the Quarter Ended
 
For the Six Months Ended
(In thousands) 
 
June 30, 2018
 
July 1, 2017
 
June 30, 2018
 
July 1, 2017
 
 
 
 
 
 
 
 
 
Pension benefits:
 
 
 
 
 
 
 
 
Service cost
 
$
20

 
$
36

 
$
44

 
$
71

Interest cost
 
1,465

 
1,653

 
2,958

 
3,318

Expected return on plan assets
 
(2,290
)
 
(2,186
)
 
(4,579
)
 
(4,368
)
Amortization of net loss
 
235

 
516

 
584

 
1,072

 
 
 
 
 
 
 
 
 
Net periodic benefit (income) cost
 
$
(570
)
 
$
19

 
$
(993
)
 
$
93

 
 
 
 
 
 
 
 
 
Other benefits:
 
 

 
 

 
 

 
 

Service cost
 
$
56

 
$
53

 
$
116

 
$
109

Interest cost
 
146

 
146

 
294

 
295

Amortization of prior service credit
 
(225
)
 
(226
)
 
(451
)
 
(451
)
Amortization of net loss (gain)
 
11

 
(15
)
 
29

 
(20
)
 
 
 
 
 
 
 
 
 
Net periodic benefit income
 
$
(12
)
 
$
(42
)
 
$
(12
)
 
$
(67
)