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STOCKHOLDERS' EQUITY (Reclass) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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)

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