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STOCKHOLDERS' EQUITY (Reclass) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Unrecognized Net Periodic Benefit Credit (Costs) |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | $ (9,725) | $ (15,800)
Tax benefit | 1,481 | 4,067
Total, net of tax | (8,244) | (11,733)
Unrecognized Net Periodic Benefit Credit (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 | (1,253) | (2,968)
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 | 33 | 93
Pension settlement expense, including termination expense |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | (8,505) | $ (12,925)
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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