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Disaggregation of Revenue
12 Months Ended
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer
17. Disaggregation of Revenue
We generate a portion of our revenue from operations outside of the United States. The following table presents revenue by geographic region based on country of invoice origin.
(dollars in thousands)
United
 States

Other
Countries

Total

Revenue by geography:
 
 
 
2017
$
706,798

$
81,508

$
788,306

2016
660,339

70,476

730,815

2015
570,519

67,421

637,940

The General Markets Group ("GMG"), the Enterprise Markets Group ("EMG"), and the International Markets Group ("IMG") comprise our go-to-market organizations. The following is a description of each market group:
The GMG focuses on sales to all K-12 private schools, faith-based and arts and cultural organizations, as well as emerging and mid-sized prospects in North America;
The EMG focuses on sales to all healthcare and higher education institutions, corporations and foundations, as well as large and/or strategic prospects in North America; and
The IMG focuses on sales to all prospects and customers outside of North America.
The following table presents our revenue by market group:
(dollars in thousands)
GMG

EMG

IMG

Other

Total

Revenue by market group:
 
 
 
 
 
2017
$
406,954

$
330,930

$
48,429

$
1,993

$
788,306

2016
383,319

302,968

42,539

1,989

730,815

2015
313,935

279,897

41,997

2,111

637,940