Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2022

Retirement Benefits [Abstract]

Schedule of multi-employer plans

		Pension Protection										Expiration
		Act ("PPA")										of
	Employer	Certified Zone Status		FIP/RP								Collective
	Identification	(1)		Status	Contributions						Surcharge	Bargaining
Pension Trust Fund	Number	2022	2021	P/I (2)	2022		2021		2020		Imposed	Agreement
International Union of Operating Engineers - Employers Construction Industry Retirement Plan - Local 302 and 612 Trust Funds	91-6028571	Green	Green	N/A	$	1,289	$	1,297	$	2,480	—	2024
Washington Laborers	91-6022315	Green	Green	N/A	$	106	$	244	$	236	—	2024
Carpenters Retirement Plan of Western Washington	91-6029051	Green	Green	N/A	$	1,717	$	1,700	$	1,898	—	2024
Cement Masons & Plasterers Trust Funds	91-6066773	N/A	Green	N/A	$	—	$	32	$	39	—	N/A
Western Conference of Teamsters Pension Trust Fund	91-6145047	Green	Green	N/A	$	44	$	44	$	15	—	2024
Alaska Carpenters Trust Fund	92-0120866	N/A	N/A	N/A	$	—	$	—	$	271	—	N/A
Alaska Laborers Trust Fund	91-6028298	N/A	N/A	N/A	$	—	$	—	$	226	—	N/A

(1) The most recent PPA zone status available in 2022 and 2021 is for the plan’s year end during 2021 and 2020, respectively.  Zone status is based on information received from the plan and is indicative of the plans funding status. 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) The FIP/RP Status P/I column indicates plans for which a financial improvement plan ("FIP") or a rehabilitation plan ("RP") is either pending ("P"), or implemented ("I").