Concentration of Risk and Enterprise Wide Disclosures (Tables)

3 Months Ended

Mar. 31, 2014

Accounts receivable

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

The table below presents the concentrations of receivables (trade and retainage) at March 31, 2014 and December 31, 2013, respectively:

	March 31, 2014				December 31, 2013
Federal Government	$	4,937	12	%	$	4,849	10	%
State Governments	1,741		4	%	4,002		8	%
Local Governments	11,188		27	%	8,857		18	%
Private Companies	23,067		57	%	31,829		64	%
Total receivables	$	40,933	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 ended March 31, 2014 and 2013.

	Three months ended March 31,
	2014		%		2013		%
Federal	$	11,897	15	%	$	20,031	27	%
State	6,911		8	%	6,219		8	%
Local	13,505		17	%	17,234		23	%
Private	48,945		60	%	31,575		42	%
	$	81,258	100	%	$	75,059	100	%