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EMPLOYEE BENEFIT PLANS
 3 Months Ended
Mar. 31, 2022
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:
 Three Months Ended
March 31,
 20222021
Service cost$20 $22 
Interest cost6 6 
Amortization of prior service cost2 18 
Amortization of gain— (6)
Net periodic benefit cost$28 $40 
The amount recorded for these obligations on the Company’s balance sheets as of March 31, 2022 and December 31, 2021 were $1,197 and $1,293, 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 $200 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 March 31, 2022 and December 31, 2021 were $676 and $684, respectively, and were included in other long-term obligations.
Net periodic benefit costs for such benefit pension plans were as follows:
Three Months Ended
March 31,
 20222021
Service cost with interest to end of year$11 $17 
Interest cost5 4 
Expected return on plan assets(10)(9)
Amortization of gain— 1 
Total net periodic benefit cost$6 $13 
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 $8,206 and $6,270 as of March 31, 2022 and December 31, 2021, respectively, and was included in other long-term obligations on the Company’s consolidated balance sheets. The related rabbi trust assets were $8,208 and $6,267 as of March 31, 2022 and December 31, 2021, respectively, and were included in other non-current assets on the Company's consolidated balance sheets.