Segment Reporting and Significant Concentration (Tables)

12 Months Ended

Dec. 31, 2015

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:

	2015		2014		2013
Americas (principally the U.S.)	$	634,389	$	636,482	$	633,163
Europe, Middle East and Africa (principally Europe)		78,711		79,535		80,527
Asia Pacific		39,420		35,269		33,778
Total revenues	$	752,520	$	751,286	$	747,468

Property and Equipment:	As of December 31,
	2015		2014
Americas (principally the U.S.)	$	29,052	$	31,912
Europe, Middle East and Africa		3,879		3,618
Asia Pacific		3,061		2,796
Total property and equipment	$	35,992	$	38,326

Summary of Revenues from Significant Clients

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

	2015			2014			2013
Comcast		24	%		22	%		19	%
DISH		14	%		15	%		15	%
Time Warner		12	%		11	%		11	%

Summary of Net Billed Accounts Receivable from Significant Clients

As of December 31, 2015 and 2014, the percentage of net billed accounts receivable balances attributable to these clients were as follows:

	As of December 31,
	2015			2014
Comcast		30	%		21	%
DISH		13	%		13	%
Time Warner		8	%		12	%