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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and December 31, 2016, respectively:

 
March 31, 2017
 
December 31, 2016
Federal Government
$
5,967

5
%
 
$
5,542

4
%
State Governments
3,406

3
%
 
9,302

7
%
Local Governments
15,185

13
%
 
20,886

16
%
Private Companies
89,560

79
%
 
96,673

73
%
Total receivables
$
114,118

100
%
 
$
132,403

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, 2017 and 2016, respectively:

 
Three months ended March 31,
 
2017

 
%

 
2016

 
%

Federal
$
19,731

 
14
%
 
$
4,156

 
3
%
State
12,019

 
9
%
 
5,367

 
4
%
Local
23,827

 
17
%
 
19,677

 
15
%
Private
83,180

 
60
%
 
100,423

 
78
%
Total contract revenues
$
138,757

 
100
%
 
$
129,623

 
100
%