Concentration of Risk and Enterprise Wide Disclosures (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2014 and December 31, 2013, respectively:

	June 30, 2014				December 31, 2013
Federal Government	$	2,223	5	%	$	4,849	10	%
State Governments	508		1	%	4,002		8	%
Local Governments	10,744		26	%	8,857		18	%
Private Companies	28,554		68	%	31,829		64	%
Total receivables	$	42,029	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 six months ended June 30, 2014 and 2013.

	Three months ended June 30,								Six months ended June 30,
	2014		%		2013		%		2014		%		2013		%
Federal	$	6,496	7	%	$	16,544	19	%	$	18,393	11	%	$	36,493	23	%
State	10,881		12	%	5,797		7	%	17,791		10	%	12,016		8	%
Local	20,586		23	%	13,065		16	%	34,092		20	%	26,186		16	%
Private	52,288		58	%	48,675		58	%	101,233		59	%	84,445		53	%
	$	90,251	100	%	$	84,081	100	%	$	171,509	100	%	$	159,140	100	%