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RETIREMENT BENEFITS
 12 Months Ended
Dec. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
RETIREMENT BENEFITS
17.RETIREMENT BENEFITS
Defined Contribution Plans
The Company maintains a defined contribution profit-sharing plan (401(k) plan) covering substantially all non-union persons employed by the Company, whereby employees may contribute a percentage of compensation, limited to maximum allowed amounts under the Internal Revenue Code. The 401(k) plan provides for a discretionary employer contribution and is determined annually by the Company’s board of directors. The Company made matching contributions of $3,839, $3,346 and $3,029, respectively, for the years ended December 31, 2024, 2023 and 2022.
Multi-Employer Pension Plans
As of December 31, 2024, the Company had approximately 3,000 employees, including 2,200 field personnel. We had 500 employees, or approximately 20% of total employees, that were union members covered by collective bargaining agreements.
The Company contributes to a number of multi-employer defined benefit pension plans under the terms of collective-bargaining agreements that cover its union-represented employees. The risks of participating in these multi-employer plans are different from single-employer plans in the following aspects:
•Assets contributed to the multi-employer plan by one employer may be used to provide benefits to employees of other participating employers. If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers.
•If the Company chooses to stop participating in some of its multi-employer plans, the Company may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability.
The following table presents our participation in these plans:
Pension Trust
Fund		Pension Plan Employer Identification NumberPlan Year End
Pension Protection Act (“PPA”) Certified Zone Status (1)
FIP / RP Status Pending/Implemented (2)
Contributions (3)
Surcharge
Imposed		Expiration Date of Collective Bargaining Agreement
20242023202420232022
Heavy and General Construction Laborers Local 472 and Local 172 (4)
22-60321033/31GreenGreenNo$4,358 $4,324 $5,119 No2/28/2027
International Union of Operating Engineers Local 825
22-60333806/30GreenGreenNo3,0162,7894,381No3/31/2026
Pension Trust Fund for Operating Engineers94-609076412/31GreenYellowYes2,3392,2881,265NoVarious dates through 2026 and 2029
All other funds 2,7103,2662,163
Total Contributions:$12,423 $12,667 $12,928 
 (1)    The PPA zone status represents the most recent available information for the respective plan, which may be 2023 or earlier for the 2024 year and 2022 or earlier for the 2023 year. The zone status is based on information that we received from the plan and is certified by the plan’s actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the orange zone are less than 80 percent funded and have an Accumulated Funding Deficiency in the current year or projected into the next six years, plans in the yellow zone are less than 80 percent funded and plans in the green zone are at least 80 percent funded.
(2)    Indicates whether the plan has a financial improvement plan (“FIP”) or a rehabilitation plan (“RP”) which is either pending or has been implemented.
(3)    Our 2024 contributions as a percentage of total plan contributions were not available for any of our plans. For 2023, Heavy and General Construction Laborers Local 472 and Local 172 represented more than 5% of the total plan contributions, Pension Trust Fund for Operating Engineers Pension Plans did not represent more that 5% of the total plan contributions and International Union of Operating Engineers Local 825 annual report was not available. For 2022, Heavy and General Construction Laborers Local 472 and Local 172 and the International Union of Operating Engineers Local 825 represented more than 5% of the total plan contributions and Pension Trust Fund for Operating Engineers Pension Plans did not represent more that 5% of the total plan contributions.
The Company also contributes to multi-employer plans for annuity benefits covered under the defined contribution portion of the plans as well as health benefits. We made contributions to our multi-employer plans of $18,507, $18,709 and $18,847 during 2024, 2023 and 2022, respectively, for these additional benefits. We currently have no intention of withdrawing from any of the multi-employer pension plans in which we participate.