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EMPLOYEE BENEFIT PLANS (Details 4) - Pension Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
COMPONENTS OF NET PERIODIC BENEFIT COST:      
Service cost $ 1,482 $ 1,516 $ 1,468
Interest cost 1,273 1,292 1,430
Expected return on plan assets (2,798) (2,539) (2,275)
Special termination benefit liability 63 0 0
Recognized net actuarial loss 1,548 1,454 1,333
Net periodic pension cost $ 1,568 $ 1,723 $ 1,956