Concentration of Risk and Enterprise-Wide Disclosures (Tables)

3 Months Ended

Mar. 31, 2023

Trade and contract retainage receivables

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

	March 31, 2023				December 31, 2022
Federal Government	$	11,006	7	%	$	4,612	3	%
State Governments		3,862	2	%		3,111	2	%
Local Governments		11,721	8	%		16,197	10	%
Private Companies		126,408	83	%		134,317	85	%
Gross receivables		152,997	100	%		158,237	100	%
Allowance for credit losses		(515)				(606)
Net receivables	$	152,482			$	157,631

Contract revenues

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

	Three months ended March 31,
	2023		%		2022		%
Federal Government	$	23,056	14	%	$	22,695	13	%
State Governments		18,328	12	%		7,704	4	%
Local Governments		20,688	13	%		32,402	19	%
Private Companies		97,102	61	%		112,130	64	%
Total contract revenues	$	159,174	100	%	$	174,931	100	%