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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
EMPLOYEE BENEFIT PLANS [Abstract]    
Defined Benefit Plan, Contributions by Employer $ 900  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 3,700  
Defined Benefit Plan, Service Cost 106 $ 172
Defined Benefit Plan, Interest Cost 1,237 1,224
Defined Benefit Plan, Expected Return on Plan Assets (1,393) (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
Defined Benefit Plan, Amortization of Gains (Losses) 765 729
Defined Benefit Plan, Net Periodic Benefit Cost $ 749 $ 640