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EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS - Projected Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in projected benefit obligation      
Projected benefit obligation, beginning of year $ 97,740 $ 83,262  
Service cost 1,282 1,068 $ 272
Interest cost 1,452 1,716 1,211
Actuarial (gain) loss (8,682) 7,591  
Benefits paid (2,010) (1,199)  
Translation adjustment (4,006) 5,302  
Projected benefit obligation, end of year 85,776 97,740 83,262
Changes in fair value of plan assets      
Fair value of plan assets, beginning of year 17,293 14,903  
Actual return on plan assets 641 682  
Contributions 1,775 1,827  
Benefits paid (1,112) (993)  
Actuarial gain 71 180  
Translation adjustment (147) 694  
Fair value of plan assets, end of year 18,521 17,293 $ 14,903
Funded status of plan $ (67,255) $ (80,447)