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EMPLOYEE BENEFIT PLANS - Schedule of Asset Allocations (Details) | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocations | 100.00% | 100.00%
Target Asset Allocations | 100.00% | 100.00%
Equity securities and diversified growth funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocations | 19.20% | 73.50%
Target Asset Allocations | 27.50% | 65.00%
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocations | 79.20% | 25.70%
Target Asset Allocations | 72.50% | 35.00%
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocations | 1.50% | 0.80%
Target Asset Allocations | 0.00% | 0.00%
Minimum | Equity securities and diversified growth funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Asset Allocations | 25.00% |
Minimum | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Asset Allocations | 70.00% |
Maximum | Equity securities and diversified growth funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Asset Allocations | 30.00% |
Maximum | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Asset Allocations | 75.00% |

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