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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018 and December 31, 2017, respectively:

 
June 30, 2018
 
December 31, 2017
Federal Government
$
2,907

3
%
 
$
3,509

3
%
State Governments
2,713

2
%
 
4,503

3
%
Local Governments
19,910

17
%
 
18,256

15
%
Private Companies
89,394

78
%
 
97,874

79
%
Total current receivables
$
114,924

100
%
 
$
124,142

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, 2018 and 2017, respectively:

 
Three months ended June 30,
 
Six months ended June 30,
 
2018

 
%

 
2017

 
%

 
2018
 
%
 
2017
 
%
Federal Government
$
16,077

 
10
%
 
$
18,360

 
13
%
 
$
29,100

 
10
%
 
$
38,092

 
14
%
State Governments
9,898

 
6
%
 
12,706

 
9
%
 
18,274

 
6
%
 
24,726

 
9
%
Local Governments
20,522

 
13
%
 
20,731

 
15
%
 
43,752

 
15
%
 
44,556

 
16
%
Private Companies
113,270

 
71
%
 
85,623

 
63
%
 
205,484

 
69
%
 
168,803

 
61
%
Total contract revenues
$
159,767

 
100
%
 
$
137,420

 
100
%
 
$
296,610

 
100
%
 
$
276,177

 
100
%