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EMPLOYEE BENEFIT PLANS - Schedule of Assumptions Used (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Plans |  |  |
Projected benefit obligation |  |  |
Discount rate beginning of year | 4.23% | 3.56% |
Net periodic pension cost |  |  |
Discount rate | 3.56% | 4.09% |
Long-term rate of return on plan assets | 6.50% | 7.00% |
Non-qualified Supplemental Executive Retirement Plan |  |  |
Projected benefit obligation |  |  |
Discount rate beginning of year | 3.83% | 3.13% | 3.31%

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