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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and December 31, 2016, respectively:

 
June 30, 2017
 
December 31, 2016
Federal Government
$
5,996

5
%
 
$
5,542

4
%
State Governments
4,314

4
%
 
9,302

7
%
Local Governments
20,183

17
%
 
20,886

16
%
Private Companies
89,608

74
%
 
96,673

73
%
Total receivables
$
120,101

100
%
 
$
132,403

100
%
Contract revenues  
Concentration Risk [Line Items]  
Schedules of concentration of risk, by risk factor
Additionally, the table below represents concentrations of contract revenue by type of customer for the three and six months ended June 30, 2017 and 2016, respectively:

 
Three months ended June 30,
 
Six months ended June 30,
 
2017

 
%

 
2016

 
%

 
2017
 
%
 
2016
 
%
Federal
$
18,360

 
13
%
 
$
7,776

 
6
%
 
$
38,092

 
14
%
 
$
11,932

 
4
%
State
12,706

 
9
%
 
10,462

 
7
%
 
24,726

 
9
%
 
15,829

 
6
%
Local
20,731

 
15
%
 
22,470

 
16
%
 
44,556

 
16
%
 
42,147

 
16
%
Private
85,623

 
63
%
 
99,593

 
71
%
 
168,803

 
61
%
 
200,016

 
74
%
Total contract revenues
$
137,420

 
100
%
 
$
140,301

 
100
%
 
$
276,177

 
100
%
 
$
269,924

 
100
%