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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS Defined Contribution Plans The Company sponsored two 401(k) savings plans for eligible employees, which were merged into one plan on January 1st, 2021. The remaining plan allows participants to make pretax contributions and the Company matches certain percentages of those pretax contributions. The remaining plan also has a discretionary profit sharing portion and matches 401(k) contributions with shares of the Company’s Common Stock. All amounts contributed to the plan are deposited into a trust fund administered by independent trustees. Postretirement Medical Plans The Company provides postretirement benefits in the form of two unfunded postretirement medical plans; one that is under a collective bargaining agreement and covers eligible retired employees of the Verona facility and a plan for those named as executive officers in the Company’s proxy statement. Net periodic benefit costs for such retirement medical plans were as follows:
|  | Six Months Ended June 30,
|  | 2021 |  | 2020
Service cost |  | $ | 43 |  |  | $ | 34 |
Interest cost |  | 12 |  |  | 13 |
Amortization of prior service cost |  | 37 |  |  | 38 |
Amortization of gain |  | (12) |  |  | (26) |
Net periodic benefit cost |  | $ | 80 |  |  | $ | 59 |
The amount recorded for these obligations on the Company’s balance sheets as of June 30, 2021 and December 31, 2020 is $1,429 and $1,374, respectively, and are included in other long-term obligations. These plans are unfunded and approved claims are paid from Company funds. Historical cash payments made under such plans have typically been less than $100 per year. Defined Benefit Pension Plans On May 27, 2019, the Company acquired Chemogas, which has an unfunded defined benefit pension plan. The plan provides for the payment of a lump sum at retirement or payments in case of death of the covered employees. The amount recorded for these obligations on the Company's consolidated balance sheet as of June 30, 2021 and December 31, 2020 were $945 and $950, respectively, and were included in other long-term obligations. Net periodic benefit costs for such benefit pensions plans were as follows:
|  | Six Months Ended June 30,
|  | 2021 |  | 2020
Service cost with interest to end of year |  | $ | 35 |  |  | $ | 52 |
Interest cost |  | 7 |  |  | 10 |
Expected return on plan assets |  | (18) |  |  | (8) |
Amortization of gain |  | 2 |  |  | — |
Total net periodic benefit cost |  | $ | 26 |  |  | $ | 54 |
Deferred Compensation Plan On June 1, 2018, the Company established an unfunded, nonqualified deferred compensation plan maintained for the benefit of a select group of management or highly compensated employees. Assets of the plan are held in a rabbi trust, which are subject to additional risk of loss in the event of bankruptcy or insolvency of the Company. The deferred compensation liability was $5,714 and $3,581 as of June 30, 2021 and December 31, 2020, respectively, and was included in other long-term obligations on the Company’s consolidated balance sheets. The related rabbi trust assets were $5,714 and $3,581 as of June 30, 2021 and December 31, 2020, respectively, and were included in other non-current assets on the Company's consolidated balance sheets.

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