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STOCKHOLDERS' EQUITY (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Impact on unrecognized net actuarial gain (loss)      
Change in the unrecognized net actuarial gain (loss), after tax $ 18,683,000 $ (5,830,000) $ (27,178,000)
Nonunion Defined Benefit Pension Plan
      
Impact on unrecognized net actuarial gain (loss)      
Change in the unrecognized net actuarial gain (loss), pre-tax 66,300,000    
Change in the unrecognized net actuarial gain (loss), after tax 40,500,000    
Curtailment gain, before tax 29,300,000    
Curtailment gain, net of tax 17,900,000    
Net actuarial gain related to change in discount rate, before tax 27,800,000    
Net actuarial gain related to change in discount rate, net of tax $ 17,000,000