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STOCKHOLDERS' EQUITY (Reclass) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Unrecognized Net Periodic Benefit Costs    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax $ (7,874) $ (7,983)
Tax benefit 3,063 3,105
Total, net of tax (4,811) (4,878)
Amortization of net actuarial loss    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax (3,908) (4,944)
Amortization of prior service credit    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax 190 190
Pension settlement expense    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax $ (4,156) $ (3,229)