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Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 countries customers	Mar. 31, 2012 countries customers	Dec. 31, 2012
Segment Reporting Information [Line Items]
Property and equipment, net	$ 369,555		$ 345,091
Percentage of revenue from outside U.S.	30.00%	28.00%
Percentage of revenues related to Europe	17.00%	17.00%
Number of foreign countries greater than 10% revenue	0	0
Number of customers accounted for 10% or more of total revenues	0	0
United States
Segment Reporting Information [Line Items]
Property and equipment, net	240,600		225,500
Foreign locations [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 129,000		$ 119,600

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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