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EMPLOYEE BENEFIT PLANS - Other Benefits (Details) - Phantom Share Units (PSUs) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure    
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent $ 22,700 $ 22,800
Share-based Payment Arrangement, Expense 13,600 9,200
Deferred Compensation Cash-based Arrangements, Liability, Current 10,900 6,500
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent 17,300 11,700
Deferred Compensation Cash-based Arrangements, Liability, Classified, Noncurrent $ 6,400 $ 5,200
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years