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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in plan assets: |  |  |
Other adjustments | $ 4,988 | $ 5,733 | $ 9,308
Pension Benefits |  |  |
Change in projected benefit obligation: |  |  |
Beginning of year | 812,029 | 639,921 |
Service cost | 36,002 | 26,718 | 29,027
Interest cost | 25,741 | 26,966 | 23,994
Actuarial (gain) loss (1) | (23,470) | 133,230 |
Plan amendment | (833) | 0 |
Benefits paid, net of retiree premiums | (15,530) | (14,806) |
End of year | 833,939 | 812,029 | 639,921
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 573,575 | 469,774 |
Actual return on plan assets | 121,751 | 97,811 |
Employer contributions | 36,998 | 20,796 |
Retiree contributions and Medicare part D subsidies | 0 | 0 |
Benefits paid | (15,530) | (14,806) |
Other adjustments | 0 | 0 |
Fair value of plan assets at end of year | 716,794 | 573,575 | 469,774
Reconciliation of funded status |  |  |
Funded status | (117,145) | (238,454) |
Unrecognized actuarial loss | 52,816 | 177,750 |
Unrecognized prior service cost | 5,181 | 10,242 |
Net amount recognized | (59,148) | (50,462) |
Short-term portion of the pension benefits | 2,100 |  |
Other Benefits |  |  |
Change in projected benefit obligation: |  |  |
Beginning of year | 150,515 | 127,204 |
Service cost | 7,945 | 7,475 | 8,317
Interest cost | 4,305 | 5,441 | 4,873
Actuarial (gain) loss (1) | (30,485) | 11,701 |
Plan amendment | 0 | 0 |
Benefits paid, net of retiree premiums | (1,622) | (1,306) |
End of year | 130,658 | 150,515 | 127,204
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 128,554 | 102,625 |
Actual return on plan assets | 13,272 | 19,730 |
Employer contributions | 6,853 | 7,505 |
Retiree contributions and Medicare part D subsidies | 2,075 | 1,874 |
Benefits paid | (3,849) | (3,180) |
Other adjustments | 152 | 0 |
Fair value of plan assets at end of year | 147,057 | 128,554 | $ 102,625
Reconciliation of funded status |  |  |
Funded status | 16,399 | (21,961) |
Unrecognized actuarial loss | (20,699) | 15,822 |
Unrecognized prior service cost | 1,932 | 2,129 |
Net amount recognized | $ (2,368) | $ (4,010) |

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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 gain (loss) 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=118255775&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=121641772&loc=SL7669686-108580 + 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=118255775&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=121641772&loc=SL7669686-108580 + Details
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