Concentration of Risk and Enterprise Wide Disclosures (Tables)

9 Months Ended

Sep. 30, 2014

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 September 30, 2014 and December 31, 2013, respectively:

	September 30, 2014				December 31, 2013
Federal Government	$	1,014	2	%	$	4,849	10	%
State Governments	2,532		5	%	4,002		8	%
Local Governments	14,171		30	%	8,857		18	%
Private Companies	29,900		63	%	31,829		64	%
Total receivables	$	47,617	100	%	$	49,537	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 three months and nine months ended September 30, 2014 and 2013.

	Three months ended September 30,								Nine months ended September 30,
	2014		%		2013		%		2014		%		2013		%
Federal	$	6,246	6	%	$	14,193	16	%	$	24,639	9	%	$	50,685	20	%
State	15,490		14	%	9,339		10	%	33,282		12	%	21,355		9	%
Local	21,413		20	%	12,359		14	%	55,505		20	%	38,545		16	%
Private	63,827		60	%	53,101		60	%	165,059		59	%	137,546		55	%
	$	106,976	100	%	$	88,992	100	%	$	278,485	100	%	$	248,131	100	%