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Employee Benefit Plans
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
The Company sponsors multiple defined contribution plans for eligible employees not covered by collective bargaining agreements. The plans include various features such as voluntary employee pre-tax and Roth-based contributions and matching contributions made by the Company. In addition, at the discretion of our Board of Directors, we may make additional profit sharing contributions to the plans. Company contributions under these defined contribution plans are based upon a percentage of income with limitations as defined by each plan. Total contributions for the years ended December 31, 2021, 2020 and 2019 amounted to $17.8 million, $16.8 million, and $10.9 million, respectively.
The Company contributes to a number of multiemployer defined benefit pension plans under the terms of collective-bargaining agreements that cover its union-represented employees, who are represented by more than 300 local unions. The related collective-bargaining agreements between those organizations and the Company, which specify the rate at which the Company must contribute to the multi-employer defined pension plan, expire at different times between 2022 and 2024.
The risks of participating in these multiemployer defined benefit pension plans are different from single-employer plans in the following aspects:
1)Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers.
2)If a participating employer stops contributing to a plan, the unfunded obligations of the plan may be borne by the remaining participating employers.
3)If the Company chooses to stop participating in a multiemployer plan, it may be required to pay the plan an amount based on the underfunded status of the plan, referred to as a withdrawal liability.
The amount of additional funds, if any, that the Company may be obligated to contribute to these plans in the future cannot be estimated due to uncertainty of the future levels of work that require the specific use of union employees covered by these plans, as well as the future contribution levels and possible surcharges on contributions applicable to these plans.
The following table summarizes plan information relating to the Company’s participation in multi-employer defined benefit pension plans, including company contributions for the last three years, the status under the Pension Protection Act of 2006, as amended by the Consolidated and Further Continuing Appropriations Act of 2015 (“PPA”) of the plans and whether the plans are subject to a funding improvement or rehabilitation plan, or contribution surcharges. The most recent zone status is for the plan’s year-end indicated in the table. The zone status is based on information that the Company received from the plan, as well as from publicly available information on the U.S. Department of Labor website. The PPA zone status for the plan year ended on December 31, 2021 has not been listed because Forms 5500 were not yet available. Among other factors, plans in the red “critical” zone are generally less than 65 percent funded, plans in the yellow “endangered” zone are between 65 and 80 percent funded, and plans in the green zone are at least 80 percent funded. Also listed in the table below are the Company’s contributions to defined contribution plans. Information in the table has been presented separately for individually significant plans and in the aggregate for all other plans.
Pension FundEIN/Pension
Plan Number		Pension Protection Act Zone StatusContributions to Plan for the Year ended December 31,Funding
Plan		Surcharge
Imposed
StatusPlan Year
End		StatusPlan Year
End		202120202019
(in thousands)
Defined Benefit Plans:
Southern California IBEW-NECA Pension Trust Fund95-6392774 001Yellow6/30/2020Yellow6/30/2019$39,529 $32,791 $14,268 YesNo
National Electrical Benefit Fund53-0181657 001Green12/31/2020Green12/31/201911,627 10,850 11,050 NoNo
Eighth District Electrical Pension
Fund		84-6100393 001Green3/31/2021Green3/31/202010,977 10,998 11,199 NoNo
IBEW Local 332 Pension Plan Part A94-2688032 004Green12/31/2020Green12/31/20196,409 3,418 1,913 NoNo
IBEW Local 769 Management Pension Plan A86-6049763 001Green6/30/2020Green6/30/20193,446 3,866 2,689 NoNo
IBEW Local No. 640 and Arizona NECA Defined Benefit Pension
Plan		86-0323980 001Green12/31/2020Green12/31/20191,751 1,195 2,397 NoNo
IBEW Local Union 1249 Pension Fund15-6035161 001Green12/31/2020Green12/31/20193,684 2,126 1,578 NoNo
Indiana/Kentucky/Ohio Regional Council of Carpenters Pension
Fund		51-6123713 001Green6/30/2020Green6/30/20191,243 2,109 1,742 NoNo
Alaska Electrical Pension Plan92-6005171 001Green12/31/2020Green12/31/20192,039 1,548 1,408 NoNo
Defined Contribution Plans:
National Electrical Annuity Plan52-6132372 001n/an/a27,974 25,037 28,822 n/an/a
Eighth District Electrical Pension Fund Annuity Plan84-6100393 002n/an/a5,097 4,915 5,339 n/an/a
San Mateo Country Electrical Construction Industry Retirement Plan51-6052127 001n/an/a5,976 3,202 854 n/an/a
Puget Sound Electrical Workers 401(K) Savings Plan91-6180326 001n/an/a1,021 2,132 1,833 n/an/a
All other plans:25,107 17,663 17,117 
Total contributions:$145,880 $121,850 $102,209 
Total contributions to these plans, at any given time, correspond to the number of union employees employed and the plans in which they participate, which varies depending upon location, the number of ongoing projects and the need for union resources in connection with such projects at a given time. The PPA data presented in the table above represents data available to us for the two most recent plan years.
One of the Company’s subsidiaries was listed in the Eighth District Electrical Pension Fund’s Form 5500 as providing more than five percent of the total contributions to that plan for the plan years ended March 31, 2021, 2020 and 2019, in the IBEW local 769 Management Pension Plan A’s Form 5500 as providing more than five percent of the total contributions to that plan for the plan years ended June 30, 2020 and 2019 and in the IBEW Local No. 640 and Arizona NECA Defined Benefit Pension Plan’s Form 5500 as providing more than five percent of the total contributions to that plan for the plan years ended December 31, 2020 and 2019. Another of the company’s subsidiaries was listed in the Southern California IBEW-NECA Pension Trust Fund Plan’s Form 5500 as providing more than 5 percent of the total contributions to that plan for the plan year ended June 30, 2020.