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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
United States |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | $ 48 | $ 39 | $ 97 | $ 78
Interest cost | 3,072 | 4,051 | 6,053 | 8,101
Expected return on plan assets | (4,198) | (5,711) | (8,707) | (11,422)
Amortization of prior service cost | 0 | 0 |  |
Amortization of net loss | 670 | 203 | 1,251 | 406
Settlement charges (1) | 1,650 | 3,334 | 6,090 | 3,334
Defined benefit plans | 1,242 | 1,916 | 4,784 | 497
Multi-employer plans | 0 | 0 |  |
Defined contribution plans | 5,872 | 4,751 | 11,034 | 10,377
Total pension cost | 7,114 | 6,667 | 15,818 | 10,874
Non-U.S. |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | 324 | 742 | 795 | 1,498
Interest cost | 392 | 683 | 1,008 | 1,379
Expected return on plan assets | (537) | (1,014) | (1,509) | (2,021)
Amortization of prior service cost | (1) | 16 | 11 | 31
Amortization of net loss | 11 | 540 | 446 | 1,095
Settlement charges (1) | 0 | 0 | 446 |
Defined benefit plans | 189 | 967 | 1,197 | 1,982
Multi-employer plans | 258 | 257 | 502 | 526
Defined contribution plans | 553 | 773 | 1,398 | 1,475
Total pension cost | $ 1,000 | $ 1,997 | $ 3,097 | $ 3,983

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