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Segment and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Gross Billings, Based on Billing Address of Clients or Client Affiliates

Gross Billings, based on the billing address of the clients or client affiliates, were as follows (in thousands):

 

 

 

Year Ended December 31,

 

 

 

2015

 

 

2016

 

 

2017

 

US

 

$

477,585

 

 

$

868,877

 

 

$

1,270,116

 

International

 

 

52,390

 

 

 

121,684

 

 

 

221,626

 

Total

 

$

529,975

 

 

$

990,561

 

 

$

1,491,742