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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
EMPLOYEE BENEFIT PLANS [Abstract]        
Defined Benefit Plan, Contributions by Employer $ 1,900      
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 2,300      
Defined Benefit Plan, Service Cost 206 $ 179 $ 312 $ 172
Defined Benefit Plan, Interest Cost 1,233 1,306 2,470 1,224
Defined Benefit Plan, Expected Return on Plan Assets (1,395) (1,531) (2,788) (1,519)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax 34 34 68 34
Defined Benefit Plan, Amortization of Gains (Losses) 762 729 1,527 729
Defined Benefit Plan, Net Periodic Benefit Cost $ 840 $ 717 $ 1,589 $ 640