Segment Reporting and Significant Concentration (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting and Significant Concentration [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):

	2012		2011		2010
Total Revenues:
Americas (principally the U.S.)	$	652,008	$	627,231	$	540,377
Europe, Middle East and Africa (principally Europe)		73,113		75,938		7,482
Asia Pacific		31,745		31,562		1,520
Total revenues	$	756,866	$	734,731	$	549,379

	As of December 31,
	2012		2011
Property and Equipment:
Americas (principally the U.S.)	$	34,796	$	36,149
Europe, Middle East and Africa (principally Europe)		2,238		2,159
Asia Pacific		2,395		2,846
Total long-lived assets	$	39,429	$	41,154

Summary of Revenues from Significant Clients

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

	2012			2011			2010
Comcast		20	%		19	%		24	%
DISH		14	%		13	%		18	%
Time Warner		10	%		10	%		12	%
Charter		<10	%		<10	%		10	%

Summary of Net Billed Accounts Receivable from Significant Clients

As of December 31, 2012 and 2011, the percentage of net billed accounts receivable balances attributable to these clients were as follows:

	As of December 31,
	2012			2011
Comcast		19	%		19	%
DISH		19	%		12	%
Time Warner		14	%		11	%
Charter		<10	%		<10	%