Concentration of Risk and Enterprise Wide Disclosures (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016 and December 31, 2015, respectively:

	December 31, 2016				December 31, 2015
Federal Government	$	5,542	4	%	$	4,230	4	%
State Governments	9,302		7	%	1,274		1	%
Local Governments	20,886		16	%	19,660		18	%
Private Companies	96,673		73	%	82,627		77	%
Total receivables	$	132,403	100	%	$	107,791	100	%

Contract revenues

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

dditionally, the table below represents concentrations of revenue by type of customer for the years ended December 31, 2016, 2015 and 2014.

	Year ended December 31,
	2016		%		2015		%		2014		%
Federal Government	$	40,361	7	%	$	45,439	10	%	$	47,390	13	%
State Governments	$	37,700	7	%	$	42,026	9	%	$	43,147	11	%
Local Governments	$	94,461	16	%	$	130,187	28	%	$	97,145	25	%
Private Companies	$	405,714	70	%	$	248,846	53	%	$	198,136	51	%
Total contract revenues	$	578,236	100	%	$	466,498	100	%	$	385,818	100	%