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BENEFIT PLANS (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2024
BENEFIT PLANS |
Schedule of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits
​ | ​ | Three Months Ended
​ | ​ | March 31,
(000’s omitted) |  | 2024 |  | 2023
Service cost | ​ | $ | 1,173 | ​ | $ | 1,108
Interest cost | ​ | ​ | 1,898 | ​ | ​ | 1,890
Expected return on plan assets | ​ |  | (4,600) | ​ |  | (4,020)
Amortization of unrecognized net loss (gain) | ​ |  | 283 | ​ |  | (555)
Amortization of prior service cost | ​ |  | 205 | ​ |  | 205
Net periodic benefit | ​ | $ | (1,041) | ​ | $ | (1,372)
​

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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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