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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Pension Cost (Reversal of Cost) | $ 859 | $ (628) | $ (1,153) |  |  |  |
Payment for Pension Benefits | $ 0 | 0 | 0 |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  |  |  | $ 0 |  |  |
Defined Contribution Plan, Maximum Annual Contribution Percent by Employee | 50.00% |  |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ 71,154 | 62,729 |  |  |  |  |
Service cost | 6,501 | 4,894 | 5,034 |  |  |  |
Interest cost | 2,394 | 2,325 | 2,262 |  |  |  |
Actuarial gain (loss) | (4,032) | 6,107 |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 7,731 | 4,901 |  |  |  |  |
Benefit obligation at end of year | 68,286 | 71,154 | 62,729 |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 144,349 | 131,011 |  |  |  |  |
Actual return on plan assets | (6,540) | 18,239 |  |  |  |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | 7,731 | 4,901 |  |  |  |  |
Fair value of plan assets at end of year | 130,078 | 144,349 | 131,011 |  |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |  |
Assets |  |  |  | 61,792 | $ 73,195 |  |
Liabilities |  |  |  | 0 | 0 |  |
Net amount recognized |  |  |  | 61,792 | 73,195 |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract] |  |  |  |  |  |  |
Net actuarial loss |  |  |  | 43,711 | 33,580 |  |
Net prior service cost |  |  |  | (1,508) | (1,921) |  |
Deferred tax assets |  |  |  | (9,613) | (12,028) |  |
Net amount recognized |  |  |  | 32,590 | 19,631 | $ 22,803 | $ 24,048
Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment and Disproportionate Tax Effect Net Of Tax | 12,959 |  |  |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 8,180 | (3,172) | (1,245) |  |  |  |
Accumulated benefit obligation |  |  |  | 66,320 | 69,678 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Service cost | 6,501 | 4,894 | 5,034 |  |  |  |
Interest cost | 2,394 | 2,325 | 2,262 |  |  |  |
Expected return on plan assets | (9,811) | (9,358) | (9,644) |  |  |  |
Amortization of prior service cost | (413) | (413) | (413) |  |  |  |
Defined Benefit Plan, Amortization of Gain (Loss) | 2,188 | 1,924 | 1,608 |  |  |  |
Net periodic benefit (income) cost | 859 | (628) | (1,153) |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] |  |  |  |  |  |  |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax | 12,319 | (2,775) | (884) |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 0 | 0 | 0 |  |  |  |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax | 413 | 413 | 413 |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | (2,188) | (1,924) | (1,608) |  |  |  |
Total recognized in accumulated other comprehensive income | 10,544 | (4,286) | (2,079) |  |  |  |
Total recognized in net periodic benefit cost and accumulated other comprehensive income | $ 11,403 | $ (4,914) | $ (3,232) |  |  |  |
Amortization of loss |  |  |  | 1,867 | 2,090 | 1,754 |
Amortization of prior service credit |  |  |  | $ (413) | $ (413) | $ (413) |
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |  |  |  |  |
Discount rate |  |  |  | 4.31% | 3.43% | 3.88% |
Rate of compensation increase |  |  |  | 3.50% | 3.50% | 3.50% |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Discount rate | 3.43% | 3.88% | 4.05% |  |  |  |
Expected return on plan assets | 7.25% | 7.25% | 7.50% |  |  |  |
Rate of compensation increase | 3.50% | 3.50% | 3.50% |  |  |  |
Fair value measurments | $ 144,349 | $ 131,011 | $ 131,011 | $ 130,078 | $ 144,349 | $ 131,011 |
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract] |  |  |  |  |  |  |
2019 |  |  |  | 4,396 |  |  |
2020 |  |  |  | 5,280 |  |  |
2021 |  |  |  | 5,229 |  |  |
2022 |  |  |  | 4,739 |  |  |
2023 |  |  |  | 4,917 |  |  |
Thereafter |  |  |  | 29,948 |  |  |
Defined Contribution Plan [Abstract] |  |  |  |  |  |  |
Defined Contribution Plan, Cost | 0 | 1,900 | $ 800 |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets Excluding Accrued Interest and Dividends |  |  |  | 130,078 | 144,349 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Defined Contribution Plan [Abstract] |  |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets Excluding Accrued Interest and Dividends |  |  |  | 122,025 | 137,496 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Defined Contribution Plan [Abstract] |  |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets Excluding Accrued Interest and Dividends |  |  |  | 8,053 | 6,853 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Defined Contribution Plan [Abstract] |  |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets Excluding Accrued Interest and Dividends |  |  |  | 0 | 0 |  |
Cash |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 175 |  |  |  |  |  |
Fair value of plan assets at end of year | 216 | 175 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 175 | 175 |  | 216 | 175 |  |
Cash | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 175 |  |  |  |  |  |
Fair value of plan assets at end of year | 216 | 175 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 175 | 175 |  | 216 | 175 |  |
Cash | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |  |  |  |
Fair value of plan assets at end of year | 0 | 0 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 0 | 0 |  | 0 | 0 |  |
Cash | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |  |  |  |
Fair value of plan assets at end of year | 0 | 0 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 0 | 0 |  | 0 | 0 |  |
US Government Agencies Debt Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 6,853 |  |  |  |  |  |
Fair value of plan assets at end of year | 8,053 | 6,853 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 6,853 | 6,853 |  | 8,053 | 6,853 |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |  |  |  |
Fair value of plan assets at end of year | 0 | 0 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 0 | 0 |  | 0 | 0 |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 6,853 |  |  |  |  |  |
Fair value of plan assets at end of year | 8,053 | 6,853 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 6,853 | 6,853 |  | 8,053 | 6,853 |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |  |  |  |
Fair value of plan assets at end of year | 0 | 0 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 0 | 0 |  | 0 | 0 |  |
Fixed income mutual funds |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 69,154 |  |  |  |  |  |
Fair value of plan assets at end of year | 74,453 | 69,154 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 69,154 | 69,154 |  | 74,453 | 69,154 |  |
Fixed income mutual funds | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 69,154 |  |  |  |  |  |
Fair value of plan assets at end of year | 74,453 | 69,154 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 69,154 | 69,154 |  | 74,453 | 69,154 |  |
Fixed income mutual funds | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |  |  |  |
Fair value of plan assets at end of year | 0 | 0 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 0 | 0 |  | 0 | 0 |  |
Fixed income mutual funds | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |  |  |  |
Fair value of plan assets at end of year | 0 | 0 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 0 | 0 |  | 0 | 0 |  |
Equity mutual funds |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 68,167 |  |  |  |  |  |
Fair value of plan assets at end of year | 47,356 | 68,167 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 68,167 | 68,167 |  | 47,356 | 68,167 |  |
Equity mutual funds | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 68,167 |  |  |  |  |  |
Fair value of plan assets at end of year | 47,356 | 68,167 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 68,167 | 68,167 |  | 47,356 | 68,167 |  |
Equity mutual funds | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |  |  |  |
Fair value of plan assets at end of year | 0 | 0 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | 0 | 0 |  | 0 | 0 |  |
Equity mutual funds | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |  |  |  |
Fair value of plan assets at end of year | 0 | 0 |  |  |  |  |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |
Fair value measurments | $ 0 | $ 0 |  | $ 0 | $ 0 |  |

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- Definition Defined Contribution Plan, Maximum Annual Contribution Percent of earnings which participant/employee may contribute into the plan, not to exceed applicable limitations prescribed by the IRS. + References No definition available. + Details
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