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STOCKHOLDERS' EQUITY (Reclass) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Unrecognized Net Periodic Benefit Costs |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | $ (4,637) | $ (3,814)
Tax benefit | 1,804 | 1,483
Total, net of tax | (2,833) | (2,331)
Amortization of net actuarial loss |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | (2,031) | (2,445)
Amortization of prior service credit |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | 95 | 95
Pension settlement expense |  |
Significant reclassifications out of accumulated other comprehensive loss by component |  |
Total, pre-tax | $ (2,701) | $ (1,464)

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