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EMPLOYEE BENEFIT PLANS - Changes in Pension Plan Level 3 Assets (Details) - Pension Plans - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Summary of changes in fair value of the pension plans' level 3 assets    
Fair value of plan assets at January 1 $ 2,303,996 $ 1,978,708
Return on plan assets:    
Fair value of plan assets at December 31 2,294,102 2,303,996
Level 3    
Summary of changes in fair value of the pension plans' level 3 assets    
Fair value of plan assets at January 1 123,140 118,218
Return on plan assets:    
Relating to assets still held at the reporting date 24,842 8,969
Relating to assets sold during the period 0 0
Purchases, sales, settlements and expenses (26,092) (4,047)
Fair value of plan assets at December 31 $ 121,890 $ 123,140