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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2018 and December 31, 2017, respectively:

 
March 31, 2018
 
December 31, 2017
Federal Government
$
4,137

4
%
 
$
3,509

3
%
State Governments
6,745

6
%
 
4,503

3
%
Local Governments
17,593

16
%
 
18,256

15
%
Private Companies
83,807

74
%
 
97,874

79
%
Total current receivables
$
112,282

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 months ended March 31, 2018 and 2017, respectively:

 
Three months ended March 31,
 
2018

 
%

 
2017

 
%

Federal Government
$
13,023

 
10
%
 
$
19,731

 
14
%
State Governments
8,376

 
6
%
 
12,019

 
9
%
Local Government
23,230

 
17
%
 
23,827

 
17
%
Private Companies
92,214

 
67
%
 
83,180

 
60
%
Total contract revenues
$
136,843

 
100
%
 
$
138,757

 
100
%