Concentration of Risk and Enterprise Wide Disclosures (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015 and December 31, 2014, respectively:

	December 31, 2015				December 31, 2014
Federal Government	$	4,230	4	%	$	4,607	9	%
State Governments	1,274		1	%	476		1	%
Local Governments	19,660		18	%	13,927		26	%
Private Companies	82,627		77	%	33,778		64	%
Total receivables	$	107,791	100	%	$	52,788	100	%

Contract revenues

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

Additionally, the table below represents concentrations of revenue by type of customer for the years ended December 31, 2015, 2014 and 2013.

	Year ended December 31,
	2015		%		2014		%		2013		%
Federal	$	45,439	10	%	$	47,390	13	%	$	65,926	19	%
State	42,026		9	%	43,147		11	%	30,451		9	%
Local	130,187		28	%	97,145		25	%	54,702		15	%
Private	248,846		53	%	198,136		51	%	203,465		57	%
Total contract revenues	$	466,498	100	%	$	385,818	100	%	$	354,544	100	%