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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016 and December 31, 2015, respectively:

 
June 30, 2016
 
December 31, 2015
Federal Government
$
2,177

2
%
 
$
4,230

5
%
State Governments
3,439

3
%
 
1,274

1
%
Local Governments
17,085

17
%
 
16,650

18
%
Private Companies
80,892

78
%
 
71,244

76
%
Total receivables
$
103,593

100
%
 
$
93,398

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 and six months ended June 30, 2016 and 2015, respectively:

 
Three months ended June 30,
 
Six months ended June 30,
 
2016

 
%

 
2015

 
%

 
2016
 
%
 
2015
 
%
Federal
$
7,776

 
6
%
 
$
11,083

 
13
%
 
$
11,932

 
4
%
 
$
23,667

 
14
%
State
10,462

 
7
%
 
12,942

 
15
%
 
15,829

 
6
%
 
22,572

 
13
%
Local
22,470

 
16
%
 
30,015

 
35
%
 
42,147

 
16
%
 
51,306

 
31
%
Private
99,593

 
71
%
 
32,051

 
37
%
 
200,016

 
74
%
 
70,001

 
42
%
Total contract revenues
$
140,301

 
100
%
 
$
86,091

 
100
%
 
$
269,924

 
100
%
 
$
167,546

 
100
%