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

 
September 30, 2018
 
December 31, 2017
Federal Government
$
6,168

5
%
 
$
3,509

3
%
State Governments
2,740

2
%
 
4,503

3
%
Local Governments
13,781

12
%
 
18,256

15
%
Private Companies
88,708

81
%
 
97,874

79
%
Total current receivables
$
111,397

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 nine months ended September 30, 2018 and 2017, respectively:

 
Three months ended September 30,
 
Nine months ended September 30,
 
2018

 
%

 
2017

 
%

 
2018
 
%
 
2017
 
%
Federal Government
$
18,072

 
15
%
 
$
14,464

 
10
%
 
$
47,170

 
11
%
 
$
52,556

 
13
%
State Governments
7,674

 
6
%
 
9,185

 
7
%
 
25,947

 
6
%
 
33,910

 
8
%
Local Governments
25,546

 
20
%
 
28,246

 
20
%
 
69,298

 
17
%
 
72,802

 
17
%
Private Companies
73,781

 
59
%
 
88,267

 
63
%
 
279,267

 
66
%
 
257,071

 
62
%
Total contract revenues
$
125,073

 
100
%
 
$
140,162

 
100
%
 
$
421,682

 
100
%
 
$
416,339

 
100
%