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RETIREMENT PLANS (Tables)
3 Months Ended
Mar. 31, 2021
RETIREMENT PLANS  
Schedule of components of the plan's net periodic pension cost

Three months ended

    

March 31, 2021

    

March 31, 2020

Pension benefits

Postretirement benefits

Pension benefits

Postretirement benefits

Operating expense

Service cost

$

54

$

35

$

423

$

32

Non-operating expense

Interest cost

572

41

879

45

Expected return on plan assets

 

(687)

 

(1,158)

 

Actuarial (gain)/ loss

(7)

(15)

Net periodic pension expense (benefit)

$

(61)

$

76

$

137

$

62