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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2021
RETIREMENT AND POSTRETIREMENT BENEFIT PLANS |
Components of Pension Cost for Defined Benefit Plans | The components of total pension cost were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | U.S. pension | ​ | Non-U.S. | ​ | U.S. pension | ​ | Non-U.S.
​ |  | plans |  | pension plans |  | plans |  | pension plans
Service cost | ​ | $ | 49 | ​ | $ | 471 | ​ | $ | 39 | ​ | $ | 756
Interest cost | ​ |  | 2,981 | ​ | ​ | 616 | ​ |  | 4,050 | ​ |  | 696
Expected return on plan assets | ​ |  | (4,509) | ​ | ​ | (972) | ​ |  | (5,711) | ​ |  | (1,007)
Amortization of prior service cost | ​ |  | — | ​ | ​ | 12 | ​ |  | — | ​ |  | 15
Amortization of net loss | ​ |  | 581 | ​ | ​ | 435 | ​ |  | 203 | ​ |  | 555
Settlement charges (1) | ​ |  | 4,440 | ​ | ​ | 446 | ​ |  | — | ​ |  | —
Defined benefit plans | ​ | ​ | 3,542 | ​ | ​ | 1,008 | ​ | ​ | (1,419) | ​ | ​ | 1,015
Multi-employer plans | ​ | ​ | — | ​ | ​ | 244 | ​ | ​ | — | ​ | ​ | 269
Defined contribution plans | ​ | ​ | 5,162 | ​ | ​ | 845 | ​ | ​ | 5,626 | ​ | ​ | 702
Total pension cost | ​ | $ | 8,704 | ​ | $ | 2,097 | ​ | $ | 4,207 | ​ | $ | 1,986
​
| (1) | Pension settlement charges primarily resulting from lump sum pension payments in the three months ended March 31, 2021.

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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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