Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2022

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

The following table presents our participation in these plans:


Pension Trust Fund	Pension Plan Employer Identification Number	Plan 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
			2022	2021		2022		2021		2020
Heavy and General Construction Laborers Local 472 and Local 172 (4)	22-6032103	3/31	Green	Green	No	$	5,119	$	3,343	$	3,417	No	2/29/2024
International Union of Operating Engineers Local 825 (4)	22-6033380	6/30	Yellow	Green	Yes	4,381		2,734		3,610		No	6/30/2024
Pension Trust Fund for Operating Engineers Pension Plan	94-6090764	12/31	Yellow	Yellow	Yes	1,265		1,411		1,458		No	6/30/2023
All other funds						2,163		2,397		1,848
				Total Contributions:		$	12,928	$	9,885	$	10,333

(1) The most recent PPA zone status available in 2022 and 2021 is for the plan’s year-end during 2021 and 2020, respectively. 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 2022 contributions as a percentage of total plan contributions were not available for any of our plans. For 2021, the International Union of Operating Engineers Local 825 annual report was not available, and the remainder of our multi-employer pension plan contributions did not represent more than 5% of the total plan contributions. For 2020, our multi-employer pension plan contributions did not represent more than 5% of the total plan contributions.

(4) Includes multi-employer pension plans acquired as part of the Petillo Acquisition. The contributions made in 2021 and 2020 were made by Petillo and not by Sterling.