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EMPLOYEE RETIREMENT PLANS (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 563 $ 1,638 $ 1,636
Interest cost 2,207 2,449 2,665
Expected return on plan assets (2,301) (2,430) (2,364)
Net amortization and deferral 526 1,527 1,762
Net periodic pension cost [1] $ 995 $ 3,184 $ 3,699
[1] The decrease in net periodic pension cost in 2017 was a result of freezing benefit accruals under the plan, effective December 31, 2016.