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EMPLOYEE BENEFIT PLANS - Asset Allocation (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of plan assets | 100.00% |  | 100.00% |
Percentage of investments for long-term growth, investment strategy mix | 70.00% |  |  |
Percentage of investments for near-term benefit payments, investment strategy mix | 30.00% |  |  |
Pension plan assets | $ 219,905 |  | $ 194,342 | $ 190,640
Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | 53,724 |  | 60,568 |
Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | 145,638 |  | 115,004 |
Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | $ 20,543 |  | $ 18,770 |
Cash and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of plan assets | 2.40% |  | 3.50% |
Pension plan assets | $ 5,432 |  | $ 6,834 |
Cash and cash equivalents | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | $ 5,432 |  | $ 6,834 |
Common Stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of plan assets | 14.70% |  | 20.70% |
Pension plan assets | $ 32,049 |  | $ 42,120 |
Common Stock | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | $ 32,049 |  | $ 42,120 |
Domestic equity - all other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of plan assets | 21.80% |  | 21.70% |
Pension plan assets | $ 48,511 |  | $ 40,178 |
Domestic equity - all other | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | 16,243 |  | 11,614 |
Domestic equity - all other | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | $ 32,268 |  | $ 28,564 |
International equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of plan assets | 16.40% |  | 21.00% |
Pension plan assets | $ 36,156 |  | $ 40,767 |
International equity | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets |  |  | 0 |
International equity | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | $ 36,156 |  | $ 40,767 |
Debt securities - core fixed income |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of plan assets | 35.20% |  | 23.50% |
Pension plan assets | $ 77,214 |  | $ 45,673 |
Debt securities - core fixed income | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets |  |  |  |
Debt securities - core fixed income | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | $ 77,214 |  | $ 45,673 |
Real estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of plan assets | 6.50% |  | 6.40% |
Pension plan assets | $ 14,074 |  | $ 12,527 |
Real estate | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | $ 14,074 |  | $ 12,527 |
Alternative/Opportunistic/Special |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of plan assets | 3.00% |  | 3.20% |
Pension plan assets | $ 6,469 |  | $ 6,243 |
Alternative/Opportunistic/Special | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan assets | $ 6,469 |  | $ 6,243 |
Scenario, Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  |  |  |
Scenario, Forecast | Cash and cash equivalents | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 0.00% |  |
Scenario, Forecast | Cash and cash equivalents | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 5.00% |  |
Scenario, Forecast | Common Stock | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 0.00% |  |
Scenario, Forecast | Common Stock | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 40.00% |  |
Scenario, Forecast | Domestic equity - all other | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 0.00% |  |
Scenario, Forecast | Domestic equity - all other | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 40.00% |  |
Scenario, Forecast | International equity | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 0.00% |  |
Scenario, Forecast | International equity | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 30.00% |  |
Scenario, Forecast | Debt securities - core fixed income | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 15.00% |  |
Scenario, Forecast | Debt securities - core fixed income | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 50.00% |  |
Scenario, Forecast | Real estate | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 0.00% |  |
Scenario, Forecast | Real estate | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 20.00% |  |
Scenario, Forecast | Alternative/Opportunistic/Special | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 0.00% |  |
Scenario, Forecast | Alternative/Opportunistic/Special | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation |  | 20.00% |  |

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