Segment Information - Geographical Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 63,725	$ 97,876	$ 216,796	$ 251,359
Property and equipment, net	17,871		17,871		15,366
Goodwill	0		0		29,748
Total Intangible Assets, Net	73,909		73,909		85,043
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	22,036	30,188	77,987	73,137
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	21,321	29,693	75,611	72,050
Property and equipment, net	9,144		9,144		8,748
Goodwill	0		0		29,588
Total Intangible Assets, Net	72,356		72,356		82,975
Other North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	715	495	2,376	1,087
Property and equipment, net	519		519		568
Total Intangible Assets, Net	255		255		386
Europe, the Middle East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	15,277	21,337	47,096	63,133
Property and equipment, net	3,061		3,061		2,928
Goodwill	0		0		160
Total Intangible Assets, Net	1,298		1,298		1,682
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	26,412	46,351	91,713	115,089
Property and equipment, net	$ 5,147		$ 5,147		$ 3,122