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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 9 Months Ended
Sep. 30, 2015
Accounts receivable  
Concentration Risk [Line Items]  
Schedules of concentration of risk, by risk factor
The table below presents the concentrations of current receivables (trade and retainage) at September 30, 2015 and December 31, 2014, respectively:

 
September 30, 2015
 
December 31, 2014
Federal Government
$
5,089

4
%
 
$
4,607

9
%
State Governments
2,853

2
%
 
476

1
%
Local Governments
33,215

24
%
 
13,927

26
%
Private Companies
97,574

70
%
 
33,778

64
%
Total receivables
$
138,731

100
%
 
$
52,788

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 nine months ended September 30, 2015 and 2014.

 
Three months ended September 30,
 
Nine months ended September 30,
 
2015
 
%
 
2014
 
%
 
2015
 
%
 
2014
 
%
Federal
$
10,629

 
8
%
 
$
6,246

 
6
%
 
$
34,302

 
11
%
 
$
24,639

 
9
%
State
8,351

 
6
%
 
15,490

 
14
%
 
30,924

 
10
%
 
33,282

 
12
%
Local
43,768

 
32
%
 
21,413

 
20
%
 
95,076

 
31
%
 
55,505

 
20
%
Private
74,313

 
54
%
 
63,827

 
60
%
 
144,305

 
48
%
 
165,059

 
59
%
 
$
137,061

 
100
%
 
$
106,976

 
100
%
 
$
304,607

 
100
%
 
$
278,485

 
100
%