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RETIREMENT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2024
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):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended
​ | ​ | March 31, 2024 |  | March 31, 2023
​ | ​ | Pension benefits | ​ | Postretirement benefits | ​ | Pension benefits | ​ | Postretirement benefits
Operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 22 | ​ | $ | 16 | ​ | $ | 38 | ​ | $ | 31
Non-operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest cost | ​ | ​ | 824 | ​ | ​ | 45 | ​ | ​ | 593 | ​ | ​ | 35
Expected return on plan assets | ​ |  | (729) | ​ |  | — | ​ | ​ | (953) | ​ |  | —
Amortization of unrecognized actuarial gain | ​ | ​ | (11) | ​ | ​ | (28) | ​ | ​ | — | ​ | ​ | —
Settlements | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 369 | ​ | ​ | —
Net periodic pension expense (benefit) | ​ | $ | 106 | ​ | $ | 33 | ​ | $ | 47 | ​ | $ | 66

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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