Segment Information. We have evaluated how our chief operating decision maker has organized our company for purposes of making operating decisions and assessing performance, and have concluded that as of December 31, 2019, we have one reportable segment.

Solutions and Services. Our solutions and services help companies around the world monetize and digitally enable the customer experience by accurately capturing, managing, generating, and optimizing the interactions and revenues associated with their customers. We generate a substantial percentage of our revenues from customers utilizing Advanced Convergent Platform (“ACP”), a private cloud-based platform, and related customer communications management solutions (e.g. field force automation, analytics, electronic bill presentment, ACH, etc.) to the North American cable and satellite markets. In addition, a smaller portion of our revenues are generated from our public cloud revenue management and payments solutions serving service providers globally. These solutions serve a broad range of companies, including financial services, media and entertainment, government, and health care. Finally, we license certain solutions (e.g., mediation, partner management, rating, and charging) and provide our professional services to implement, configure, and maintain these solutions. These solutions are sometimes provided under a managed service arrangement, where we assume long-term responsibility for delivering our solutions and related operations under a defined scope and specified service levels.

Geographic Regions. For 2019, 2018, and 2017, revenues attributable to our operations in the Americas were 87%, 85%, and 85%, respectively. We use the location of the client as the basis of attributing revenues to individual regions.

Financial information relating to our operations by geographic region is as follows (in thousands):

	2019		2018		2017
Americas (principally the U.S.)	$	866,831	$	740,885	$	669,712
Europe, Middle East and Africa (principally Europe)		91,685		89,924		72,120
Asia Pacific		38,294		44,250		47,750
Total revenues	$	996,810	$	875,059	$	789,582

Property and Equipment:	As of December 31,
	2019		2018
Americas (principally the U.S.)	$	70,990	$	72,079
Europe, Middle East and Africa (principally Europe)		1,564		2,056
Asia Pacific		11,875		7,678
Total property and equipment	$	84,429	$	81,813

Significant Clients and Industry Concentration. A large percentage of our revenues have been generated from our two largest clients, which are Comcast Corporation (“Comcast”) and Charter Communications, Inc. (“Charter”).

Revenues from these clients represented the following percentages of our total revenues for the following years:

	2019			2018			2017
Comcast		23	%		25	%		28	%
Charter		20	%		20	%		22	%

As of December 31, 2019 and 2018, the percentage of net billed accounts receivable balances attributable to these clients were as follows:

	As of December 31,
	2019			2018
Comcast		24	%		24	%
Charter		24	%		21	%

We expect to continue to generate a significant percentage of our future revenues from our largest clients, mentioned above. There are inherent risks whenever a large percentage of total revenues are concentrated with a limited number of clients. Should a significant client: (i) terminate or fail to renew their contracts with us, in whole or in part for any reason; (ii) significantly reduce the number of customer accounts processed on our solutions, the price paid for our solutions and services, or the scope of solutions and services that we provide; or (iii) experience significant financial or operating difficulties, it could have a material adverse effect on our financial position and results of operations.