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STOCKHOLDERS' EQUITY (Details 3) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Unrecognized Net Periodic Benefit Costs    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax $ (3,763) $ (5,798)
Tax benefit 1,464 2,256
Total, net of tax (2,299) (3,542)
Amortization of net actuarial loss    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax (2,142) (1,293)
Amortization of prior service credit    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax 95 95
Pension settlement expense    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax $ (1,716) $ (4,600)