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Components of Net Periodic Benefit Cost (Tables)
9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
 
 
Three Months Ended September 30,
 
Nine Months Ended September 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

 
$
913

 
$
1,041

 
$
26

 
$
31

Interest cost
 
866

 
798

 
36

 
33

 
2,599

 
2,395

 
109

 
98

Expected return on plan assets
 
(896
)
 
(991
)
 

 

 
(2,689
)
 
(2,972
)
 

 

Net amortization of prior service cost
 

 

 

 

 
1

 
1

 

 

Net amortization of net (gain) loss
 
389

 
362

 
(4
)
 

 
1,168

 
1,085

 
(12
)
 

Net Periodic Benefit Cost
 
$
663

 
$
516

 
$
41

 
$
43

 
$
1,992

 
$
1,550

 
$
123

 
$
129