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BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2021
BENEFIT PLANS |
Schedule of net periodic benefit cost | The net periodic benefit cost for the three and six months ended June 30, 2021 and 2020 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​ | June 30, | ​ | June 30, | ​
(000’s omitted) | ​ | 2021 |  | 2020 |  | 2021 |  | ​ | 2020 |  | 2021 |  | ​ | 2020 |  | ​ | 2021 |  | 2020 |
Service cost | ​ | $ | 1,480 | ​ | $ | 1,438 | ​ | $ | 2,960 | ​ | $ | 2,875 | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 0 | ​
Interest cost | ​ |  | 1,259 |  |  | 1,356 |  | ​ | 2,518 |  | ​ | 2,712 |  |  | 11 |  | ​ | 14 |  | ​ | 22 |  | ​ | 28 | ​
Expected return on plan assets | ​ |  | (4,695) | ​ |  | (3,932) | ​ | ​ | (9,391) | ​ | ​ | (7,864) | ​ |  | 0 |  | ​ | 0 | ​ | ​ | 0 |  | ​ | 0 | ​
Amortization of unrecognized net loss | ​ |  | 900 | ​ |  | 810 | ​ | ​ | 1,800 | ​ | ​ | 1,620 | ​ |  | 11 |  | ​ | 10 | ​ | ​ | 22 |  | ​ | 20 | ​
Amortization of prior service cost | ​ |  | 94 | ​ |  | 60 | ​ | ​ | 189 | ​ | ​ | 120 | ​ |  | (44) |  | ​ | (44) | ​ | ​ | (89) |  | ​ | (89) | ​
Net periodic benefit | ​ | $ | (962) | ​ | $ | (268) | ​ | $ | (1,924) | ​ | $ | (537) | ​ | $ | (22) | ​ | $ | (20) | ​ | $ | (45) | ​ | $ | (41) | ​

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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