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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 6 Months Ended
Jun. 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 June 30, 2015 and December 31, 2014, respectively:

 
June 30, 2015
 
December 31, 2014
Federal Government
$
6,922

11
%
 
$
4,607

9
%
State Governments
389

1
%
 
476

1
%
Local Governments
20,052

32
%
 
13,927

26
%
Private Companies
35,319

56
%
 
33,778

64
%
Total receivables
$
62,682

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 six months ended June 30, 2015 and 2014.
 
Three months ended June 30,
 
Six months ended June 30,
 
2015
 
%
 
2014
 
%
 
2015
 
%
 
2014
 
%
Federal
$
11,083

 
13
%
 
$
6,496

 
7
%
 
$
23,667

 
14
%
 
$
18,393

 
11
%
State
12,942

 
15
%
 
10,881

 
12
%
 
22,572

 
13
%
 
17,791

 
10
%
Local
30,015

 
35
%
 
20,586

 
23
%
 
51,306

 
31
%
 
34,092

 
20
%
Private
32,051

 
37
%
 
52,288

 
58
%
 
70,001

 
42
%
 
101,233

 
59
%
 
$
86,091

 
100
%
 
$
90,251

 
100
%
 
$
167,546

 
100
%
 
$
171,509

 
100
%