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Components of Net Periodic Benefit Cost (Tables)
6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
(000's)
 
(000's)
 
 
Pension Benefits
 
Post-Retirement
Health Benefits
 
Pension Benefits
 
Post-Retirement
Health Benefits
 
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
304

 
$
347

 
$
9

 
$
10

 
$
609

 
$
694

 
$
17

 
$
21

Interest cost
 
866

 
798

 
36

 
33

 
1,733

 
1,597

 
73

 
65

Expected return on plan assets
 
(896
)
 
(991
)
 

 

 
(1,793
)
 
(1,981
)
 

 

Net amortization of prior service cost
 

 

 

 

 

 

 

 

Net amortization of net (gain) loss
 
390

 
362

 
(4
)
 

 
779

 
723

 
(8
)
 

Net Periodic Benefit Cost
 
$
664

 
$
516

 
$
41

 
$
43

 
$
1,328

 
$
1,033

 
$
82

 
$
86