Segment Reporting and Significant Concentration (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Summary of Financial Information Relating to Operations by Geographic Region

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

Total Revenues:

	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

Summary of Revenues from Significant Clients

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	%

Summary of Net Billed Accounts Receivable from Significant Clients

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