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STOCKHOLDERS' EQUITY (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Impact on unrecognized net actuarial gain (loss)      
Change in the unrecognized net actuarial gain (loss), after tax $ (5,830,000) $ (27,178,000) $ 3,064,000
Nonunion Defined Benefit Pension Plan
      
Impact on unrecognized net actuarial gain (loss)      
Change in the unrecognized net actuarial gain (loss), pre-tax   (34,400,000)  
Change in the unrecognized net actuarial gain (loss), after tax   $ (25,000,000)