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EMPLOYEE BENEFIT PLANS (Included in AOCI) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Nonunion Defined Benefit Pension Plan |  |
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost |  |
Unrecognized net actuarial loss | $ 22,588 | $ 23,294
Total | 22,588 | 23,294
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year |  |
Unrecognized net actuarial loss | 2,881 |
Total | 2,881 |
Supplemental Benefit Plan |  |
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost |  |
Unrecognized net actuarial loss | 543 | 635
Total | 543 | 635
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year |  |
Unrecognized net actuarial loss | 80 |
Total | 80 |
Postretirement Health Benefit Plan |  |
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost |  |
Unrecognized net actuarial loss | 2,764 | 5,708
Unrecognized prior service credit | (127) | (317)
Total | 2,637 | $ 5,391
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year |  |
Unrecognized net actuarial loss | 274 |
Unrecognized prior service credit | (93) |
Total | $ 181 |

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