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Concentration of Risk and Enterprise-Wide Disclosures (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2019 and December 31, 2018, respectively:

 
June 30, 2019
 
December 31, 2018
Federal Government
$
3,420

3
%
 
$
2,319

2
%
State Governments
3,363

2
%
 
916

1
%
Local Governments
50,017

37
%
 
30,187

28
%
Private Companies
79,381

58
%
 
74,953

69
%
Total receivables
$
136,181

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 and six months ended June 30, 2019 and 2018, respectively:

 
Three months ended June 30,
 
Six months ended June 30,
 
2019
 
%

 
2018
 
%

 
2019
 
%
 
2018
 
%
Federal Government
$
12,301

 
8
%
 
$
16,077

 
10
%
 
$
22,578

 
7
%
 
$
29,100

 
10
%
State Governments
10,286

 
6
%
 
9,898

 
6
%
 
14,341

 
5
%
 
18,274

 
6
%
Local Government
51,599

 
31
%
 
20,522

 
13
%
 
96,029

 
31
%
 
43,752

 
15
%
Private Companies
91,799

 
55
%
 
113,270

 
71
%
 
176,142

 
57
%
 
205,484

 
69
%
Total contract revenues
$
165,985

 
100
%
 
$
159,767

 
100
%
 
$
309,090

 
100
%
 
$
296,610

 
100
%