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Retirement Benefits (Tables)
6 Months Ended
Jun. 30, 2017
Postemployment Benefits [Abstract]  
Schedule of net periodic benefit expense (income)
The components of net periodic benefit expense related to the non-contributory, defined benefit pension plan for the three and six month periods ended June 30 were as follows:

 
 
Three Months Ended June 30,
 
Six Months Ended June 30
In thousands
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
210

 
$
199

 
$
420

 
$
398

Interest cost
 
284

 
284

 
568

 
568

Expected return on plan assets
 
(630
)
 
(607
)
 
(1,260
)
 
(1,215
)
Amortization of net loss
 
169

 
170

 
338

 
341

 
 
 
 
 
 
 
 
 
Net Periodic Benefit Expense
 
$
33

 
$
46

 
$
66

 
$
92