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PENSION AND RETIREMENT PLANS LIABILITIES (Tables) | 9 Months Ended
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Sep. 30, 2022
PENSION AND RETIREMENT PLANS LIABILITIES |
Schedule of net periodic cost (benefit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
(in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
Interest cost | ​ | $ | 34 | ​ | $ | 37 | ​ | $ | 100 | ​ | $ | 111 | ​
Expected return on plan assets | ​ |  | — | ​ |  | (72) | ​ |  | — | ​ |  | (216) | ​
Amortization of net losses | ​ |  | 28 | ​ |  | 18 | ​ |  | 84 | ​ |  | 54 | ​
Net periodic cost (benefit) | ​ | $ | 62 | ​ | $ | (17) | ​ | $ | 184 | ​ | $ | (51) | ​

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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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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