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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Schedule of changes in benefit obligations, fair value of plan assets, and funded status of plan | The changes in the benefit obligation, the changes in fair value of plan assets, and the funded status of the Company’s Pension and Post-Retirement Medical Plans as of and for the years ended December 31, 2018 and 2017 were as follows:
|  | Pension Plans |  | Post-Retirement Medical Plan
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 185,231 |  |  | $ | 135,508 |  |  | $ | 21,527 |  |  | $ | 22,740 |
Service cost |  | 47,344 |  |  | 40,572 |  |  | 1,148 |  |  | 1,263 |
Interest cost |  | 5,793 |  |  | 4,336 |  |  | 620 |  |  | 688 |
Plan amendments |  | — |  |  | 462 |  |  | — |  |  | — |
Plan settlements |  | — |  |  | (4,881 | ) |  | — |  |  | — |
Benefit payments |  | (7,214 | ) |  | (4,034 | ) |  | (562 | ) |  | (693 | )
Actuarial (gain) loss |  | (12,811 | ) |  | 13,268 |  |  | (3,388 | ) |  | (2,471 | )
Projected benefit obligation at end of year |  | $ | 218,343 |  |  | $ | 185,231 |  |  | $ | 19,345 |  |  | $ | 21,527 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 121,652 |  |  | $ | 75,367 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  | (6,148 | ) |  | 14,019 |  |  | — |  |  | — |
Benefits paid |  | (7,214 | ) |  | (4,034 | ) |  | (562 | ) |  | (693 | )
Plan settlements |  | — |  |  | (4,881 | ) |  | — |  |  | — |
Employer contributions |  | 35,081 |  |  | 41,181 |  |  | 562 |  |  | 693 |
Fair value of plan assets at end of year |  | $ | 143,371 |  |  | $ | 121,652 |  |  | $ | — |  |  | $ | — |
Reconciliation of funded status: |  |  |  |  |  |  |  |
Fair value of plan assets at end of year |  | $ | 143,371 |  |  | $ | 121,652 |  |  | $ | — |  |  | $ | — |
Less benefit obligations at end of year |  | 218,343 |  |  | 185,231 |  |  | 19,345 |  |  | 21,527 |
Funded status at end of year |  | $ | (74,972 | ) |  | $ | (63,579 | ) |  | $ | (19,345 | ) |  | $ | (21,527 | )
Schedule of expected benefit payments | Benefit payments, which reflect expected future services that the Company expects to pay are as follows for the years ended December 31:
|  | Pension Benefits |  | Post-Retirement Medical Plan
2019 |  | $ | 11,155 |  |  | $ | 1,342 |
2020 |  | 13,039 |  |  | 1,605 |
2021 |  | 16,570 |  |  | 1,726 |
2022 |  | 19,991 |  |  | 1,761 |
2023 |  | 19,228 |  |  | 1,746 |
Years 2024-2028 |  | 136,559 |  |  | 9,121 |
Schedule of net periodic benefit cost | The components of net periodic benefit cost were as follows for the years ended December 31, 2018, 2017 and 2016:
|  | Pension Benefits |  | Post-Retirement Medical Plan
|  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 47,344 |  |  | $ | 40,572 |  |  | $ | 36,359 |  |  | $ | 1,148 |  |  | $ | 1,263 |  |  | $ | 1,047 |
Interest cost |  | 5,793 |  |  | 4,336 |  |  | 3,096 |  |  | 620 |  |  | 688 |  |  | 528 |
Expected return on plan assets |  | (8,540 | ) |  | (5,766 | ) |  | (4,681 | ) |  | — |  |  | — |  |  | — |
Settlement loss recognized |  | — |  |  | 993 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost |  | 85 |  |  | 53 |  |  | 53 |  |  | 646 |  |  | 646 |  |  | 541 |
Amortization of actuarial loss |  | 285 |  |  | 452 |  |  | 1,043 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost |  | $ | 44,967 |  |  | $ | 40,640 |  |  | $ | 35,870 |  |  | $ | 2,414 |  |  | $ | 2,597 |  |  | $ | 2,116 |
Schedule of pre-tax amounts recognized in other comprehensive income (loss) | The pre-tax amounts recognized in other comprehensive income (loss) for the years ended December 31, 2018, 2017 and 2016 were as follows:
|  | Pension Benefits |  | Post-Retirement Medical Plan
|  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Prior service costs |  | $ | — |  |  | $ | 462 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,524 |
Net actuarial loss (gain) |  | 1,877 |  |  | 5,015 |  |  | 176 |  |  | (3,388 | ) |  | (2,471 | ) |  | 1,487 |
Amortization of losses and prior service cost |  | (826 | ) |  | (1,410 | ) |  | (1,096 | ) |  | (646 | ) |  | (646 | ) |  | (541 | )
Total changes in other comprehensive income (loss) |  | $ | 1,051 |  |  | $ | 4,067 |  |  | $ | (920 | ) |  | $ | (4,034 | ) |  | $ | (3,117 | ) |  | $ | 3,470 |
Schedule of pre-tax amounts in accumulated other comprehensive loss not yet recognized as components of net periodic costs | The pre-tax amounts in accumulated other comprehensive income (loss) as of December 31, 2018, and 2017 that have not yet been recognized as components of net periodic costs were as follows:
|  | Pension Benefits |  | Post-Retirement Medical Plan
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Prior service costs |  | $ | (799 | ) |  | $ | (885 | ) |  | $ | (4,691 | ) |  | $ | (5,337 | )
Net actuarial (loss) gain |  | (24,136 | ) |  | (22,544 | ) |  | 3,981 |  |  | 593 |
Total |  | $ | (24,935 | ) |  | $ | (23,429 | ) |  | $ | (710 | ) |  | $ | (4,744 | )
Schedule of pre-tax amounts in accumulated other comprehensive loss to be recognized over next fiscal year | The following pre-tax amounts included in accumulated other comprehensive income (loss) as of December 31, 2018 are expected to be recognized as components of net periodic benefit cost during the year ended December 31, 2019:
|  | Pension Benefits |  | Post-Retirement Medical Plan
Amortization of prior service costs |  | $ | (86 | ) |  | $ | (646 | )
Amortization of net actuarial (loss) gain |  | (180 | ) |  | 135 |
Total |  | $ | (266 | ) |  | $ | (511 | )
Schedule of assumptions used | The weighted average assumptions used to determine the net periodic benefit costs for the years ended December 31, 2018, 2017 and 2016 were as follows:
|  | Qualified Plan |  | Supplemental Plan |  | Post-Retirement Medical Plan
|  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Discount rates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective rate for service cost |  | 3.62 | % |  | 4.15 | % |  | 4.15 | % |  | 3.58 | % |  | 4.17 | % |  | 4.17 | % |  | 3.59 | % |  | 4.10 | % |  | 4.10 | %
Effective rate for interest cost |  | 3.21 | % |  | 3.38 | % |  | 3.38 | % |  | 3.15 | % |  | 3.20 | % |  | 3.20 | % |  | 2.97 | % |  | 3.11 | % |  | 3.11 | %
Effective rate for interest on service cost |  | 3.32 | % |  | 3.59 | % |  | 3.59 | % |  | 3.24 | % |  | 3.63 | % |  | 3.63 | % |  | 3.46 | % |  | 3.84 | % |  | 3.84 | %
Expected long-term rate of return on plan assets |  | 6.25 | % |  | 6.50 | % |  | 7.00 | % |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase |  | 4.53 | % |  | 4.81 | % |  | 4.81 | % |  | 5.00 | % |  | 5.50 | % |  | 5.50 | % |  | N/A |  |  | N/A |  |  | N/A |
The weighted average assumptions used to determine the benefit obligations as of December 31, 2018, and 2017 were as follows:
|  | Qualified Plan |  | Supplemental Plan |  | Post-Retirement Medical Plan
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Discount rate - benefit obligations |  | 4.22 | % |  | 3.58 | % |  | 4.17 | % |  | 3.55 | % |  | 3.99 | % |  | 3.33 | %
Rate of compensation increase |  | 4.55 | % |  | 4.53 | % |  | 5.00 | % |  | 5.00 | % |  | — |  |  | — |
Schedule of assumed health care cost trend rates | The assumed health care cost trend rates as of December 31, 2018 and 2017 were as follows:
|  | Post-Retirement Medical Plan
|  | 2018 |  | 2017
Health care cost trend rate assumed for next year |  | 5.8 | % |  | 6.0 | %
Rate to which the cost trend rate was assumed to decline (the ultimate trend rate) |  | 4.5 | % |  | 4.5 | %
Year that the rate reaches the ultimate trend rate |  | 2038 |  |  | 2038 |
Schedule of effect of one-percentage-point change in assumed health care cost trend rates | Assumed health care cost trend rates have a significant effect on the amounts reported for retiree health care plans. A one percentage-point change in assumed health care cost trend rates would have the following effects on the medical post-retirement benefits:
|  | 1% Increase |  | 1% Decrease
Effect on total service and interest cost components |  | $ | 11 |  |  | $ | (10 | )
Effect on accumulated post-retirement benefit obligation |  | 237 |  |  | (226 | )
Schedule of fair value of assets of the Company's Qualified Plan | The table below presents the fair values of the assets of the Company’s Qualified Plan as of December 31, 2018 and 2017 by level of fair value hierarchy. Assets categorized in Level 2 of the hierarchy consist of collective trusts and are measured at fair value based on the closing net asset value (“NAV”) as determined by the fund manager and reported daily. As noted above, the Company’s post-retirement medical plan is funded on a pay-as-you-go basis and has no assets.
|  | Fair Value Measurements Using NAV as Practical Expedient (Level 2)
|  | December 31,
|  | 2018 |  | 2017
Equities: |  |  |  |
Domestic equities |  | $ | 34,800 |  |  | $ | 36,582 |
Developed international equities |  | 19,201 |  |  | 17,236 |
Emerging market equities |  | 10,263 |  |  | 8,474 |
Global low volatility equities |  | 11,437 |  |  | 9,983 |
Fixed-income |  | 59,680 |  |  | 45,469 |
Real Estate |  | 7,905 |  |  | — |
Cash and cash equivalents |  | 85 |  |  | 3,908 |
Total |  | $ | 143,371 |  |  | $ | 121,652 |

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