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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 1,800  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year $ 1,000   1,000  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 228 $ 169 658 $ 447
Interest cost 1,075 1,056 3,304 3,237
Expected return on assets (1,186) (1,487) (3,563) (4,470)
Amortization of unrecognized prior service cost 56 50 169 150
Amortization of net unrecognized loss 766 682 2,296 2,048
Net periodic pension cost $ 939 $ 470 $ 2,864 $ 1,412