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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in plan assets: |  |  |
Other adjustments | $ (9,903) | $ 4,988 | $ 5,733
Pension Benefits |  |  |
Change in projected benefit obligation: |  |  |
Beginning of year | 833,939 | 812,029 |
Service cost | 35,055 | 36,002 | 26,718
Interest cost | 21,667 | 25,741 | 26,966
Actuarial (gain) loss | 13,520 | (23,470) |
Plan amendment | 0 | (833) |
Benefits paid, net of retiree premiums | (16,704) | (15,530) |
End of year | 887,477 | 833,939 | 812,029
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 716,794 | 573,575 |
Actual return on plan assets | 84,488 | 121,751 |
Employer contributions | 25,891 | 36,998 |
Retiree contributions and Medicare part D subsidies | 0 | 0 |
Benefits paid | (16,704) | (15,530) |
Other adjustments | 0 | 0 |
Fair value of plan assets at end of year | 810,469 | 716,794 | 573,575
Reconciliation of funded status |  |  |
Funded status | (77,008) | (117,145) |
Unrecognized actuarial loss (gain) | 12,323 | 52,816 |
Unrecognized prior service cost | 4,174 | 5,181 |
Net amount recognized | (60,511) | (59,148) |
Short-term portion of the pension benefits | 2,100 | 2,100 |
Other Benefits |  |  |
Change in projected benefit obligation: |  |  |
Beginning of year | 130,658 | 150,515 |
Service cost | 6,072 | 7,945 | 7,475
Interest cost | 3,217 | 4,305 | 5,441
Actuarial (gain) loss | 5,276 | (30,485) |
Plan amendment | 0 | 0 |
Benefits paid, net of retiree premiums | (2,753) | (1,622) |
End of year | 142,470 | 130,658 | 150,515
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 147,057 | 128,554 |
Actual return on plan assets | 23,160 | 13,272 |
Employer contributions | 1,972 | 6,853 |
Retiree contributions and Medicare part D subsidies | 2,199 | 2,075 |
Benefits paid | (5,057) | (3,849) |
Other adjustments | 105 | 152 |
Fair value of plan assets at end of year | 169,436 | 147,057 | $ 128,554
Reconciliation of funded status |  |  |
Funded status | 26,966 | 16,399 |
Unrecognized actuarial loss (gain) | (29,327) | (20,699) |
Unrecognized prior service cost | 1,738 | 1,932 |
Net amount recognized | $ (623) | $ (2,368) |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://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 http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 + Details
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