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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
EMPLOYEE BENEFIT PLANS [Abstract]      
Defined Benefit Plan, Contributions by Employer $ 1,100    
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     $ 3,600
Defined Benefit Plan, Service Cost 172 $ 197  
Defined Benefit Plan, Interest Cost 1,224 1,408  
Defined Benefit Plan, Expected Return on Plan Assets (1,519) (1,517)  
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) 729 758  
Defined Benefit Plan, Net Periodic Benefit Cost $ 640 $ 880