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STOCKHOLDERS' EQUITY (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Unrecognized net periodic benefit costs:        
INCOME (LOSS) BEFORE INCOME TAXES $ 27,371 $ 7,865 $ 18,416 $ (15,438)
Tax benefit (10,163) (2,987) (6,401) 6,921
NET INCOME (LOSS) 17,208 4,878 12,015 (8,517)
Unrecognized Net Periodic Benefit Costs | Amounts Reclassified from Accumulated Other Comprehensive Loss
        
Unrecognized net periodic benefit costs:        
Amortization of net actuarial loss     (1,293)  
Amortization of prior service credit     95  
Pension settlement expense     (4,600)  
INCOME (LOSS) BEFORE INCOME TAXES     (5,798)  
Tax benefit     2,256  
NET INCOME (LOSS)     $ (3,542)