Employee Benefit Plans (Tables)

12 Months Ended

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