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EMPLOYEE BENEFIT PLANS - Obligations and Funded Status (Details) - Pension Plans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Change in benefit obligations:    
Benefit obligations at January 1 $ 2,509,093 $ 2,324,080
Service cost 1,093 11,915
Interest cost 57,973 67,781
Actuarial (gain) loss (113,663) 212,099
Pension curtailment and settlement 0 (19,052)
Benefits paid (105,887) (104,977)
Foreign currency exchange rate changes (4,384) 17,247
Benefit obligations at December 31 2,344,225 2,509,093
Change in plan assets:    
Fair value of plan assets at January 1 2,303,996 1,978,708
Actual return on plan assets 94,931 275,372
Employer contribution 6,992 136,029
Benefits paid (105,887) (104,977)
Foreign currency exchange rate changes (5,930) 18,864
Fair value of plan assets at December 31 2,294,102 2,303,996
Funded status $ (50,123) $ (205,097)
Funded percent 98.00% 92.00%