Concentration of Risk and Enterprise Wide Disclosures (Tables)

12 Months Ended

Dec. 31, 2018

Accounts receivable

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

The table below presents the concentrations of current receivables (trade and retainage) at December 31, 2018 and December 31, 2017, respectively:

	December 31, 2018				December 31, 2017
Federal Government	$	2,319	2	%	$	3,509	3	%
State Governments	916		1	%	4,503		3	%
Local Governments	30,187		28	%	18,256		15	%
Private Companies	74,953		69	%	97,874		79	%
Total receivables	$	108,375	100	%	$	124,142	100	%

Contract revenues

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

dditionally, the table below represents concentrations of contract revenue by type of customer for the years ended December 31, 2018, 2017 and 2016.

	2018		%		2017		%		2016		%
Federal Government	$	42,143	8	%	$	63,823	11	%	$	40,361	7	%
State Governments	30,470		6	%	42,613		7	%	37,700		7	%
Local Governments	107,478		21	%	91,591		16	%	94,461		16	%
Private Companies	340,803		65	%	380,526		66	%	405,714		70	%
Total contract revenues	$	520,894	100	%	$	578,553	100	%	$	578,236	100	%