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RETIREMENT PLANS (Tables)
3 Months Ended
Mar. 31, 2022
RETIREMENT PLANS  
Schedule of components of the plan's net periodic pension cost

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Three months ended

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March 31, 2022

    

March 31, 2021

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Pension benefits

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Postretirement benefits

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Pension benefits

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Postretirement benefits

Operating expense

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Service cost

$

57

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$

36

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$

54

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$

35

Non-operating expense

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​

​

​

​

​

​

​

​

​

Interest cost

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565

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​

33

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572

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​

41

Expected return on plan assets

 

(925)

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—

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(687)

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—

Actuarial (gain)/ loss

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—

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—

​

​

—

​

​

—

Net periodic pension expense (benefit)

$

(303)

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$

69

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$

(61)

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$

76