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RETIREMENT PLANS (Tables)
6 Months Ended
Jun. 30, 2023
RETIREMENT PLANS  
Schedule of components of the plan's net periodic pension cost

The Company recorded the net periodic benefit cost identified below (in thousands):

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Three months ended

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Six months ended

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June 30, 2023

    

June 30, 2022

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June 30, 2023

    

June 30, 2022

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Pension benefits

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Postretirement benefits

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Pension benefits

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Postretirement benefits

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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

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$

38

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$

31

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$

57

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$

36

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$

76

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$

62

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$

114

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$

72

Non-operating expense

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​

​

​

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​

​

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​

​

​

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​

​

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​

Interest cost

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593

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​

35

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​

565

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​

33

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​

1,187

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​

70

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​

1,130

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​

66

Expected return on plan assets

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(953)

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—

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(925)

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—

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(1,905)

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—

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(1,850)

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—

Settlements

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—

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—

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1,725

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—

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369

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—

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1,725

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​

—

Net periodic pension expense (benefit)

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$

(322)

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$

66

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$

1,422

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$

69

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$

(273)

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$

132

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$

1,119

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$

138