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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013 and December 31, 2012, respectively:

 
December 31, 2013
 
December 31, 2012
Federal Government
$
4,849

10
%
 
$
7,375

14
%
State Governments
4,002

8
%
 
1,761

3
%
Local Governments
8,857

18
%
 
5,532

11
%
Private Companies
31,829

64
%
 
38,617

72
%
Total receivables
$
49,537

100
%
 
$
53,285

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, 2013, 2012 and 2011.
 
 
Year ended December 31,
 
 
2013
 
%
 
2012
 
%
 
2011
 
%
Federal
 
$
65,926

 
19
%
 
$
64,049

 
22
%
 
$
108,123

 
42
%
State
 
30,451

 
9
%
 
35,799

 
12
%
 
48,604

 
19
%
Local
 
54,702

 
15
%
 
44,626

 
15
%
 
40,647

 
15
%
Private
 
203,465

 
57
%
 
147,568

 
51
%
 
62,478

 
24
%
 
 
$
354,544

 
100
%
 
$
292,042

 
100
%
 
$
259,852

 
100
%