Concentration of Risk and Enterprise Wide Disclosures (Tables)

12 Months Ended

Dec. 31, 2019

Trade and contract retainage receivables

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

	December 31, 2019				December 31, 2018
Federal Government	$	4,765	3	%	$	2,319	2	%
State Governments		5,864	4	%		916	1	%
Local Governments		41,944	26	%		30,187	28	%
Private Companies		106,514	67	%		74,953	69	%
Total receivables	$	159,087	100	%	$	108,375	100	%

Contract revenues

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

	2019		%		2018		%		2017		%
Federal Government	$	46,425	6	%	$	42,143	8	%	$	63,823	11	%
State Governments		47,831	7	%		30,470	6	%		42,613	7	%
Local Government		212,958	30	%		107,478	21	%		91,591	16	%
Private Companies		401,176	57	%		340,803	65	%		380,526	66	%
Total contract revenues	$	708,390	100	%	$	520,894	100	%	$	578,553	100	%