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BENEFIT PLANS (Tables)
9 Months Ended
Sep. 30, 2021
BENEFIT PLANS  
Schedule of net periodic benefit cost

The net periodic benefit cost for the three and nine months ended September 30, 2021 and 2020 is as follows:

Pension Benefits

Post-retirement Benefits

Three Months Ended

Nine Months Ended

Three Months Ended

Nine Months Ended

September 30, 

September 30, 

September 30, 

September 30, 

(000’s omitted)

    

2021

    

2020

    

2021

    

2020

    

2021

    

2020

    

2021

    

2020

Service cost

$

1,480

$

1,438

$

4,440

$

4,313

$

0

$

0

$

0

$

0

Interest cost

1,259

1,356

3,777

4,068

11

15

33

43

Expected return on plan assets

 

(4,696)

 

(3,932)

(14,087)

(11,796)

 

0

 

0

0

 

0

Amortization of unrecognized net loss

 

900

 

810

2,700

2,430

 

11

 

10

33

 

30

Amortization of prior service cost

 

95

 

60

284

180

 

(45)

 

(45)

(134)

 

(134)

Net periodic benefit

$

(962)

$

(268)

$

(2,886)

$

(805)

$

(23)

$

(20)

$

(68)

$

(61)