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RETIREMENT BENEFITS - Changes in Benefit Obligations and Plan Assets as Well as Funded Status of Retirement Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | $ 1,024,454 |  |
Fair value of plan assets at end of year | 764,405 | $ 1,024,454 |
Pension Benefits |  |  |
Change in benefit obligation |  |  |
Obligation at beginning of year | 925,129 | 971,415 |
Service cost | 12,603 | 14,265 | $ 13,638
Interest cost | 20,579 | 17,697 | 23,074
Actuarial gains | (231,923) | (23,537) |
Benefits paid | (44,443) | (43,512) |
Participants’ contributions | 0 | 0 |
Foreign currency exchange rate changes | (7,841) | (11,199) |
Obligation at end of year | 674,104 | 925,129 | 971,415
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 1,024,454 | 956,345 |
Actual return on plan assets | (218,002) | 109,120 |
Employer contributions | 2,396 | 2,501 |
Participants’ contributions | 0 | 0 |
Benefits paid | (44,443) | (43,512) |
Fair value of plan assets at end of year | 764,405 | 1,024,454 | 956,345
Funded status | 90,301 | 99,325 |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current assets | 169,940 | 226,882 |
Current liabilities | (2,766) | (2,602) |
Non-current liabilities | (76,873) | (124,955) |
Net amount recognized | 90,301 | 99,325 |
Amounts recognized in accumulated other comprehensive loss |  |  |
Net actuarial loss (gain) | 209,874 | 161,837 |
Prior service cost (credit) | 505 | 731 |
Net amount recognized | 210,379 | 162,568 |
Other Postretirement Benefits |  |  |
Change in benefit obligation |  |  |
Obligation at beginning of year | 19,525 | 22,152 |
Service cost | 78 | 107 | 88
Interest cost | 413 | 363 | 566
Actuarial gains | (3,609) | (1,631) |
Benefits paid | (1,984) | (1,573) |
Participants’ contributions | 24 | 107 |
Foreign currency exchange rate changes | 0 | 0 |
Obligation at end of year | 14,447 | 19,525 | 22,152
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 1,960 | 1,466 |
Participants’ contributions | 24 | 107 |
Benefits paid | (1,984) | (1,573) |
Fair value of plan assets at end of year | 0 | 0 | $ 0
Funded status | (14,447) | (19,525) |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current assets | 0 | 0 |
Current liabilities | (1,421) | (1,460) |
Non-current liabilities | (13,026) | (18,065) |
Net amount recognized | (14,447) | (19,525) |
Amounts recognized in accumulated other comprehensive loss |  |  |
Net actuarial loss (gain) | (6,002) | (2,690) |
Prior service cost (credit) | (969) | (2,637) |
Net amount recognized | $ (6,971) | $ (5,327) |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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