Segment Reporting and Significant Concentration (Tables)

12 Months Ended

Dec. 31, 2013

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:

	2013		2012		2011
Americas (principally the U.S.)	$	633,163	$	652,008	$	627,231
Europe, Middle East and Africa (principally Europe)		80,527		73,113		75,938
Asia Pacific		33,778		31,745		31,562
Total revenues	$	747,468	$	756,866	$	734,731

Property and Equipment:	As of December 31,
	2013		2012
Americas (principally the U.S.)	$	27,115	$	34,796
Europe, Middle East and Africa		4,280		2,238
Asia Pacific		3,666		2,395
Total property and equipment	$	35,061	$	39,429

Summary of Revenues from Significant Clients

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

	2013			2012			2011
Comcast		19	%		20	%		19	%
DISH		15	%		14	%		13	%
Time Warner		11	%		10	%		10	%

Summary of Net Billed Accounts Receivable from Significant Clients

As of December 31, 2013 and 2012, the percentage of net billed accounts receivable balances attributable to these clients were as follows:

	As of December 31,
	2013			2012
Comcast		21	%		19	%
DISH		14	%		19	%
Time Warner		9	%		14	%