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EMPLOYEE BENEFIT PLANS (Details) - Pension Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CHANGE IN BENEFIT OBLIGATION:      
Benefit obligation at beginning of year $ 38,637 $ 33,117  
Service cost 1,516 1,468 $ 1,557
Interest cost 1,292 1,430 1,341
Actuarial (gain) loss 1,588 4,578  
Benefits paid (2,020) (1,956)  
Benefit obligation at end of year 41,013 38,637 33,117
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 30,671 28,429  
Actual return on plan assets 4,949 348  
Employer contributions 3,500 3,850  
Benefits paid (2,020) (1,956)  
Fair value of plan assets at end of year 37,100 30,671 $ 28,429
Funded status of the plan $ (3,913) $ (7,966)