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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 12 Months Ended
Dec. 31, 2012
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 December 31, 2012 and December 31, 2011, respectively:

 
December 31, 2012
 
December 31, 2011
Federal Government
$
7,375

14
%
 
$
5,958

22
%
State Governments
1,761

3
%
 
379

1
%
Local Governments
5,532

10
%
 
6,207

24
%
Private Companies
38,617

73
%
 
14,387

53
%
Total receivables
$
53,285

100
%
 
$
26,931

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, 2012, 2011 and 2010.
 
 
Year ended December 31,
 
 
2012
 
%
 
2011
 
%
 
2010
 
%
Federal
 
$
64,049

 
22
%
 
$
108,123

 
42
%
 
$
143,697

 
41
%
State
 
35,799

 
12
%
 
48,604

 
19
%
 
40,145

 
11
%
Local
 
44,626

 
15
%
 
40,647

 
15
%
 
41,868

 
12
%
Private
 
147,568

 
51
%
 
62,478

 
24
%
 
127,425

 
36
%
 
 
$
292,042

 
100
%
 
$
259,852

 
100
%
 
$
353,135

 
100
%