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Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 countries customers	Sep. 30, 2011 countries customers	Sep. 30, 2012 countries customers	Sep. 30, 2011 customers countries	Dec. 31, 2011
Segment Reporting Information [Line Items]
Property and equipment, net	$ 331,218		$ 331,218		$ 293,043
Percentage of revenue from outside U.S.	29.00%	29.00%	28.00%	29.00%
Percentage of revenues related to Europe	16.00%	18.00%	17.00%	18.00%
Number of foreign countries greater than 10% revenue	0	0	0	0
Number of customers accounted for 10% or more of total revenues	0	0	0	0
United States
Segment Reporting Information [Line Items]
Property and equipment, net	235,700		235,700		194,000
Foreign locations [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 95,500		$ 95,500		$ 99,000

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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