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EMPLOYEE BENEFIT PLANS - Changes in Pension Plan Level 3 Assets (Details) - Pension Plans - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Summary of changes in fair value of the pension plans' level 3 assets |  |
Fair value of plan assets at January 1 | $ 1,978,708 | $ 1,725,543
Return on plan assets: |  |
Fair value of plan assets at December 31 | 2,303,996 | 1,978,708
Level 3 |  |
Summary of changes in fair value of the pension plans' level 3 assets |  |
Fair value of plan assets at January 1 | 118,218 | 121,836
Return on plan assets: |  |
Relating to assets still held at the reporting date | 8,969 | 5,752
Relating to assets sold during the period | 0 | (44)
Purchases, sales, settlements and expenses | (4,047) | (9,326)
Fair value of plan assets at December 31 | $ 123,140 | $ 118,218

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + 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 (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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