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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]        
Defined Benefit Plan, Contributions by Employer $ 2,900      
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 800      
Defined Benefit Plan, Service Cost 74 $ 83 $ 386 $ 326
Defined Benefit Plan, Interest Cost 1,230 1,167 3,700 3,601
Defined Benefit Plan, Expected Return on Plan Assets (1,396) (1,512) (4,184) (4,549)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 35 34 103 103
Defined Benefit Plan, Amortization of Gains (Losses) 762 729 2,289 2,187
Defined Benefit Plan, Net Periodic Benefit Cost $ 705 $ 501 $ 2,294 $ 1,668