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STOCKHOLDERS' EQUITY (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in accumulated other comprehensive loss, net of tax, by component      
Balance at beginning of the period $ (57,372) $ (58,402)  
Other comprehensive income (loss) before reclassifications 36,439    
Amounts reclassified from accumulated other comprehensive loss 6,021    
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 42,460 1,030 (22,349)
Balance at end of the period (14,912) (57,372) (58,402)
Unrecognized Net Periodic Benefit Costs
      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balance at beginning of the period (56,968)    
Other comprehensive income (loss) before reclassifications 36,561    
Amounts reclassified from accumulated other comprehensive loss 6,021    
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 42,582    
Balance at end of the period (14,386)    
Foreign Currency Translation
      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balance at beginning of the period (404)    
Other comprehensive income (loss) before reclassifications (122)    
OTHER COMPREHENSIVE INCOME (LOSS), net of tax (122)    
Balance at end of the period $ (526)