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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019 and December 31, 2018, respectively:

 
March 31, 2019
 
December 31, 2018
Federal Government
$
3,533

3
%
 
$
2,319

2
%
State Governments
509

—
%
 
916

1
%
Local Governments
39,053

33
%
 
30,187

28
%
Private Companies
75,769

64
%
 
74,953

69
%
Total receivables
$
118,864

100
%
 
$
108,375

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, 2019 and 2018, respectively:

 
Three months ended March 31,
 
2019

 
%

 
2018

 
%

Federal Government
$
10,277

 
7
%
 
$
13,023

 
10
%
State Governments
4,055

 
3
%
 
8,376

 
6
%
Local Government
44,430

 
31
%
 
23,230

 
17
%
Private Companies
84,343

 
59
%
 
92,214

 
67
%
Total contract revenues
$
143,105

 
100
%
 
$
136,843

 
100
%