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EMPLOYEE RETIREMENT PLANS - Components of Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Components of net periodic pension cost [Abstract]      
Service cost $ 1,675 $ 1,092  
Interest cost 1,165 1,285  
Supplemental Executive Retirement Plan [Member]      
Components of net periodic pension cost [Abstract]      
Service cost 1,675 1,092 $ 969
Interest cost 1,165 1,285 1,613
Amortization of prior service cost 1,099 1,098 1,595
Amortization of loss 4,936 2,181 1,641
Total net periodic benefit cost $ 8,875 $ 5,656 $ 5,818