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POSTRETIREMENT BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2022
POSTRETIREMENT BENEFIT PLANS |
Summary of the components of net periodic benefit cost (credit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31 | ​
​ | ​ | Supplemental | ​ | Postretirement | ​
​ | ​ | Benefit Plan | ​ | Health Benefit Plan | ​
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
​ | ​ | (in thousands) | ​
Service cost | ​ | $ | — | ​ | $ | — | ​ | $ | 39 | ​ | $ | 48 | ​
Interest cost | ​ |  | 2 | ​ |  | 1 | ​ |  | 110 | ​ |  | 107 | ​
Amortization of net actuarial (gain) loss(1) | ​ |  | 2 | ​ |  | 2 | ​ |  | (191) | ​ |  | (137) | ​
Net periodic benefit cost (credit)(2) | ​ | $ | 4 | ​ | $ | 3 | ​ | $ | (42) | ​ | $ | 18 | ​
​ ​ ​
(1) | The Company amortizes actuarial gains and losses over the average remaining active service period of the plan participants and does not use a corridor approach.
(2) | Service cost is reported within operating expenses and the other components of net periodic benefit cost are reported within the other line item of other income (costs).

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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=123447040&loc=d3e1928-114920 + Details
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