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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 3,600  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year $ 1,800   1,800  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 169 $ 129 447 $ 482
Interest cost 1,056 1,197 3,237 3,531
Expected return on assets (1,487) (1,372) (4,470) (4,109)
Amortization of unrecognized prior service cost 50 34 150 102
Amortization of net unrecognized loss 682 663 2,048 1,992
Net periodic pension cost $ 470 $ 651 $ 1,412 $ 1,998