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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016 and December 31, 2015, respectively:

 
March 31, 2016
 
December 31, 2015
Federal Government
$
4,794

4
%
 
$
4,230

4
%
State Governments
812

1
%
 
1,274

1
%
Local Governments
20,204

18
%
 
19,660

18
%
Private Companies
87,335

77
%
 
82,627

77
%
Total receivables
$
113,145

100
%
 
$
107,791

100
%
Contract revenues  
Concentration Risk [Line Items]  
Schedules of concentration of risk, by risk factor
Additionally, the table below represents concentrations of revenue by type of customer for the three months ended March 31, 2016 and 2015, respectively:

 
Three months ended March 31,
 
2016

%

 
2015

%

Federal
$
4,156

3
%
 
$
12,312

15
%
State
5,367

4
%
 
9,631

12
%
Local
19,677

15
%
 
21,292

26
%
Private
100,423

78
%
 
38,220

47
%
Total contract revenues
$
129,623

100
%
 
$
81,455

100
%