Concentration of Risk and Enterprise Wide Disclosures (Tables)

6 Months Ended

Jun. 30, 2012

Accounts Receivable [Member]

Concentration Risk [Line Items]

Schedules of Concentration of Risk, by Risk Factor

The table below presents the concentrations of receivables (trade and retainage) at June 30, 2012 and December 31, 2011, respectively:

	June 30, 2012				December 31, 2011
Federal Government	$	4,771	12	%	$	5,958	22	%
State Governments	418		1	%	379		1	%
Local Governments	9,498		23	%	6,207		24	%
Private Companies	26,273		64	%	14,387		53	%
Total receivables	$	40,960	100	%	$	26,931	100	%

Contract Revenues [Member]

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 and six months ended June 30, 2012 and 2011.

	Three months ended June 30,								Six months ended June 30,
	2012		%		2011		%		2012		%		2011		%
Federal……..	$	12,212	18	%	$	29,869	42	%	$	24,928	21	%	$	66,514	44	%
State………..	9,494		14	%	16,054		23	%	17,014		14	%	27,641		19	%
Local……….	13,478		20	%	12,044		17	%	24,594		21	%	22,139		15	%
Private………	31,948		48	%	12,932		18	%	51,486		44	%	33,662		22	%
	$	67,132	100	%	$	70,899	100	%	$	118,022	100	%	$	149,956	100	%