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Segment and Geographic Information (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Schedule of revenue by source
The following table sets forth the Company’s sources of revenue (dollars in thousands): 
 
At or For Year Ended December 31,
 
2017
 
2016
 
2015
Subscription revenue
$
396,764

 
$
339,756

 
$
270,093

Percentage of subscription revenue to total revenue
82.3
%
 
80.3
%
 
79.5
%
Professional services revenue
$
85,221

 
$
83,368

 
$
69,558

Percentage of professional services revenue to total revenue
17.7
%
 
19.7
%
 
20.5
%
 
$
481,985

 
$
423,124

 
$
339,651
Schedule of revenue from external customers and long-lived assets, by geographical areas
Revenue by geographic region, which is generally based on the address of the Company’s clients as defined in their master subscription agreements, is set forth below (in thousands):
 
 
Years Ended December 31,
 
2017
 
2016
 
2015
Revenue
 
 
 
 
 
United States
$
313,729

 
$
284,657

 
$
228,724

United Kingdom
25,701

 
27,571

 
30,104

All other countries
142,555

 
110,896

 
80,823

Total revenue
$
481,985

 
$
423,124

 
$
339,651


Property and equipment by region is set forth below (in thousands):
 
 
 
December 31,
 
 
2017
 
2016
Property and equipment, net
 
 
 
 
United States
 
$
16,468

 
$
19,843

United Kingdom
 
3,378

 
2,985

All other countries
 
971

 
1,134

Total property and equipment, net
 
$
20,817

 
$
23,962