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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
EMPLOYEE BENEFIT PLANS [Abstract]          
Defined Benefit Plan, Contributions by Employer $ 2,200        
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     $ 2,600    
Defined Benefit Plan, Service Cost 179 $ 193   $ 351 $ 402
Defined Benefit Plan, Interest Cost 1,306 1,426   2,530 2,847
Defined Benefit Plan, Expected Return on Plan Assets (1,531) (1,501)   (3,050) (3,003)
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 68
Defined Benefit Plan, Amortization of Gains (Losses) 729 758   1,458 1,516
Defined Benefit Plan, Net Periodic Benefit Cost $ 717 $ 910   $ 1,357 $ 1,830