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v3.23.2

BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2023
BENEFIT PLANS |
Schedule of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(000’s omitted) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost | ​ | $ | 1,108 | ​ | $ | 1,240 | ​ | $ | 2,216 | ​ | $ | 2,480
Interest cost | ​ | ​ | 1,890 | ​ | ​ | 1,334 | ​ | ​ | 3,780 | ​ | ​ | 2,668
Expected return on plan assets | ​ |  | (4,020) | ​ |  | (4,756) | ​ | ​ | (8,040) | ​ | ​ | (9,512)
Amortization of unrecognized net (gain) loss | ​ |  | (555) | ​ |  | 211 | ​ | ​ | (1,110) | ​ | ​ | 422
Amortization of prior service cost | ​ |  | 205 | ​ |  | 154 | ​ | ​ | 410 | ​ | ​ | 308
Net periodic benefit | ​ | $ | (1,372) | ​ | $ | (1,817) | ​ | $ | (2,744) | ​ | $ | (3,634)

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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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