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EMPLOYEE BENEFIT PLANS - Changes in Plan Assets, Benefit Obligations, and Funded Status (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in plan assets: |  |  |
Other adjustments | $ (20,215) | $ (14,476) | $ (9,903)
Pension Benefits |  |  |
Change in projected benefit obligation: |  |  |
Beginning of year | 685,254 | 887,477 |
Service cost | 22,159 | 34,847 | 35,055
Interest cost | 34,190 | 25,596 | 21,667
Actuarial (gain) loss | (8,532) | (243,769) |
Benefits paid, net of retiree premiums | (22,302) | (18,897) |
End of year | 710,769 | 685,254 | 887,477
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 637,330 | 810,469 |
Actual return on plan assets | 95,280 | (171,517) |
Employer contributions | 5,965 | 17,275 |
Retiree contributions and Medicare part D subsidies | 0 | 0 |
Benefits paid | (22,302) | (18,897) |
Other adjustments | 0 | 0 |
Fair value of plan assets at end of year | 716,273 | 637,330 | 810,469
Reconciliation of funded status |  |  |
Funded status | 5,504 | (47,924) |
Unrecognized actuarial gain | (66,073) | (19,512) |
Unrecognized prior service cost | 2,680 | 3,205 |
Net amount recognized | (57,889) | (64,231) |
Short-term portion of the pension benefits | 2,800 | 2,600 |
Other Benefits |  |  |
Change in projected benefit obligation: |  |  |
Beginning of year | 101,752 | 142,470 |
Service cost | 4,489 | 6,830 | 6,072
Interest cost | 5,219 | 4,009 | 3,217
Actuarial (gain) loss | 27,208 | (49,462) |
Benefits paid, net of retiree premiums | (3,935) | (2,095) |
End of year | 134,733 | 101,752 | 142,470
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 144,686 | 169,436 |
Actual return on plan assets | 22,133 | (23,326) |
Employer contributions | 189 | 671 |
Retiree contributions and Medicare part D subsidies | 2,449 | 2,176 |
Benefits paid | (6,557) | (4,421) |
Other adjustments | 467 | 150 |
Fair value of plan assets at end of year | 163,367 | 144,686 | $ 169,436
Reconciliation of funded status |  |  |
Funded status | 28,634 | 42,934 |
Unrecognized actuarial gain | (26,764) | (44,555) |
Unrecognized prior service cost | 1,428 | 1,583 |
Net amount recognized | $ 3,298 | $ (38) |

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- Definition Represents the amount of contributions made by plan participants and amount of the period's gross receipts received from the prescription drug subsidy. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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