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EMPLOYEE RETIREMENT PLANS - Components of Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic pension cost [Abstract]      
Service cost $ 969 $ 1,301  
Interest cost 1,613 1,047  
Supplemental Executive Retirement Plan [Member]      
Components of net periodic pension cost [Abstract]      
Service cost 969 1,301 $ 1,214
Interest cost 1,613 1,047 1,013
Amortization of prior service cost 1,595 1,683 1,667
Amortization of loss 1,641 435 457
Total net periodic benefit cost $ 5,818 $ 4,466 $ 4,351