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EMPLOYEE BENEFIT PLANS (Details) - Pension Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CHANGE IN BENEFIT OBLIGATION:      
Benefit obligation at beginning of year $ 41,013 $ 38,637  
Service cost 1,482 1,516 $ 1,468
Interest cost 1,273 1,292 1,430
Actuarial (gain) loss 823 1,588  
Special/contractual termination benefits 63 0 0
Benefits paid (3,560) (2,020)  
Benefit obligation at end of year 41,094 41,013 38,637
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 37,100 30,671  
Actual return on plan assets (1,062) 4,949  
Employer contributions 6,000 3,500  
Benefits paid (3,560) (2,020)  
Fair value of plan assets at end of year 38,478 37,100 $ 30,671
Funded status of the plan $ (2,616) $ (3,913)