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STOCKHOLDERS' EQUITY (Reclass) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax $ (2,022) $ (2,146)
Tax benefit 787 835
Total, net of tax (1,235) (1,311)
Unrecognized Net Periodic Benefit Costs    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, net of tax (1,235) (1,311)
Amortization of net actuarial loss    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax (1,169) (1,074)
Amortization of prior service credit    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax 47 47
Pension settlement expense    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax $ (900) $ (1,119)