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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2016 and December 31, 2015, respectively:

 
September 30, 2016
 
December 31, 2015
Federal Government
$
812

1
%
 
$
4,230

5
%
State Governments
6,994

6
%
 
1,274

1
%
Local Governments
16,582

13
%
 
16,650

18
%
Private Companies
102,012

80
%
 
71,244

76
%
Total receivables
$
126,400

100
%
 
$
93,398

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 and nine months ended September 30, 2016 and 2015, respectively:

 
Three months ended September 30,
 
Nine months ended September 30,
 
2016

 
%

 
2015

 
%

 
2016
 
%
 
2015
 
%
Federal
$
13,268

 
8
%
 
$
10,629

 
8
%
 
$
25,200

 
6
%
 
$
34,302

 
11
%
State
13,285

 
8
%
 
8,351

 
6
%
 
29,114

 
7
%
 
30,924

 
10
%
Local
29,718

 
18
%
 
43,768

 
32
%
 
71,865

 
17
%
 
95,076

 
31
%
Private
107,746

 
66
%
 
74,313

 
54
%
 
307,762

 
70
%
 
144,305

 
48
%
Total contract revenues
$
164,017

 
100
%
 
$
137,061

 
100
%
 
$
433,941

 
100
%
 
$
304,607

 
100
%