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EMPLOYEE RETIREMENT PLANS (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 569 $ 563
Interest cost 2,204 2,207
Expected return on plan assets (2,711) (2,301)
Net amortization and deferral 634 526
Net periodic pension cost $ 696 $ 995