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STOCKHOLDERS' EQUITY (Reclass) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Unrecognized Net Periodic Benefit Costs |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | $ (9,115) | $ (3,685)
Tax benefit | 1,324 | 949
Total, net of tax | (7,791) | (2,736)
Unrecognized Net Periodic Benefit Costs | Nonunion Defined Benefit Pension Plan |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, net of tax | (7,300) |
Amortization of net actuarial loss |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | (1,005) | (2,152)
Amortization of net actuarial loss | Nonunion Defined Benefit Pension Plan |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | (300) |
Amortization of prior service credit |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | 25 | 70
Pension settlement expense, including termination expense |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | (8,135) | $ (1,603)
Pension settlement expense, including termination expense | Nonunion Defined Benefit Pension Plan |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | (8,100) |
Pension termination expense | Nonunion Defined Benefit Pension Plan |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | (4,000) |
Tax benefit | $ 0 |

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