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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Retirement Benefits [Abstract] |
Schedule of Individually Significant Multi-Employer Plans and in Aggregate Other 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, 2020 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 Fund |  | EIN/Pension Plan Number |  | Pension Protection Act Zone Status |  | Contributions to Plan for the Year ended December 31, |  | Funding Plan |  | Surcharge Imposed
|  |  |  | Status |  | Plan Year End |  | Status |  | Plan Year End |  | 2020 |  | 2019 |  | 2018 |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  | (in thousands) |  |  |  |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Southern California IBEW-NECA Pension Trust Fund |  | 95-6392774 001 |  | Yellow |  | 6/30/2019 |  | Yellow |  | 6/30/2018 |  | $ | 32,791 |  |  | $ | 14,268 |  |  | $ | 767 |  |  | Yes |  | Yes
National Electrical Benefit Fund |  | 53-0181657 001 |  | Green |  | 12/31/2019 |  | Green |  | 12/31/2018 |  | 10,850 |  |  | 11,050 |  |  | 9,840 |  |  | No |  | No
Eighth District Electrical Pension Fund |  | 84-6100393 001 |  | Green |  | 3/31/2020 |  | Green |  | 3/31/2019 |  | 10,998 |  |  | 11,199 |  |  | 9,707 |  |  | No |  | No
IBEW Local 332 Pension Plan Part A |  | 94-2688032 004 |  | Green |  | 12/31/2019 |  | Green |  | 12/31/2018 |  | 3,418 |  |  | 1,913 |  |  | — |  |  | No |  | No
IBEW Local 769 Management Pension Plan A |  | 86-6049763 001 |  | Green |  | 6/30/2019 |  | Green |  | 6/30/2018 |  | 3,866 |  |  | 2,689 |  |  | 2,587 |  |  | No |  | No
IBEW Local No. 640 and Arizona NECA Defined Benefit Pension Plan |  | 86-0323980 001 |  | Green |  | 12/31/2019 |  | Green |  | 12/31/2018 |  | 1,195 |  |  | 2,397 |  |  | 1,629 |  |  | No |  | No
IBEW Local Union 1249 Pension Fund |  | 15-6035161 001 |  | Green |  | 12/31/2019 |  | Green |  | 12/31/2018 |  | 2,126 |  |  | 1,578 |  |  | 881 |  |  | No |  | No
Indiana/Kentucky/Ohio Regional Council of Carpenters Pension Fund |  | 51-6123713 001 |  | Green |  | 6/30/2019 |  | Green |  | 6/30/2018 |  | 2,109 |  |  | 1,742 |  |  | 1,157 |  |  | No |  | No
Alaska Electrical Pension Plan |  | 92-6005171 001 |  | Green |  | 12/31/2019 |  | Green |  | 12/31/2018 |  | 1,548 |  |  | 1,408 |  |  | 2,723 |  |  | No |  | No
Defined Contribution Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Electrical Annuity Plan |  | 52-6132372 001 |  |  |  | n/a |  |  |  | n/a |  | 25,037 |  |  | 28,822 |  |  | 26,559 |  |  | n/a |  | n/a
Eighth District Electrical Pension Fund Annuity Plan |  | 84-6100393 002 |  |  |  | n/a |  |  |  | n/a |  | 4,915 |  |  | 5,339 |  |  | 4,785 |  |  | n/a |  | n/a
San Mateo Country Electrical Construction Industry Retirement Plan |  | 51-6052127 001 |  |  |  | n/a |  |  |  | n/a |  | 3,202 |  |  | 854 |  |  | — |  |  | n/a |  | n/a
Puget Sound Electrical Workers 401(K) Savings Plan |  | 91-6180326 001 |  |  |  | n/a |  |  |  | n/a |  | 2,132 |  |  | 1,833 |  |  | 967 |  |  | n/a |  | n/a
All other plans: |  |  |  |  |  |  |  |  |  |  |  | 17,663 |  |  | 17,117 |  |  | 8,818 |  |  |  |  |
Total contributions: |  |  |  |  |  |  |  |  |  |  |  | $ | 121,850 |  |  | $ | 102,209 |  |  | $ | 70,420 |  |  |  |  |

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