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

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

Pension Benefits

Post-retirement Benefits

Three Months Ended

Six Months Ended

Three Months Ended

Six Months Ended

June 30, 

June 30, 

June 30, 

June 30, 

(000’s omitted)

2021

    

2020

    

2021

    

2020

    

2021

    

2020

    

2021

    

2020

    

Service cost

$

1,480

$

1,438

$

2,960

$

2,875

$

0

$

0

$

0

$

0

Interest cost

 

1,259

    

 

1,356

    

2,518

 

2,712

    

 

11

    

14

 

22

    

28

Expected return on plan assets

 

(4,695)

 

(3,932)

(9,391)

(7,864)

 

0

 

0

0

 

0

Amortization of unrecognized net loss

 

900

 

810

1,800

1,620

 

11

 

10

22

 

20

Amortization of prior service cost

 

94

 

60

189

120

 

(44)

 

(44)

(89)

 

(89)

Net periodic benefit

$

(962)

$

(268)

$

(1,924)

$

(537)

$

(22)

$

(20)

$

(45)

$

(41)