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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2021
POSTRETIREMENT BENEFIT PLANS |
Summary of the components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31 | ​
​ | ​ | Supplemental | ​ | Postretirement | ​
​ | ​ | Benefit Plan | ​ | Health Benefit Plan | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
​ | ​ | (in thousands) | ​
Service cost | ​ | $ | — | ​ | $ | — | ​ | $ | 48 | ​ | $ | 47 | ​
Interest cost | ​ |  | 1 | ​ |  | 3 | ​ |  | 107 | ​ |  | 144 | ​
Pension settlement expense(1) | ​ |  | — | ​ |  | 89 | ​ |  | — | ​ |  | — | ​
Amortization of net actuarial (gain) loss(2) | ​ |  | 2 | ​ |  | 4 | ​ |  | (137) | ​ |  | (149) | ​
Net periodic benefit cost(3) | ​ | $ | 3 | ​ | $ | 96 | ​ | $ | 18 | ​ | $ | 42 | ​
​ ​
(1) | For the three months ended March 31, 2020, pension settlement expense for the supplemental benefit pension plan of $0.1 million (pre-tax), or $0.1 million (after-tax), was due to a $0.7 million benefit related to an officer retirement.
(2) | 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.
(3) | Service cost is reported within operating expenses and the other components of net periodic benefit cost (including pension settlement expense) are reported within the other line item of other income (costs) in the consolidated statements of operations.

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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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