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Revenue Information (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Schedule of revenue categories
The following table presents the Company’s revenue categories during the periods presented (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Transaction revenue
$
303,840

 
$
259,516

 
$
241,395

Forecasts, consulting and other revenue
19,309

 
17,991

 
18,443

Total revenues
$
323,149

 
$
277,507

 
$
259,838