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Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 countries	Dec. 31, 2010 countries	Dec. 31, 2009 countries
Segment Reporting Information [Line Items]
Property and equipment, net	$ 293,043	$ 255,929
Revenues derived from Europe	29.00%	28.00%	28.00%
Revenues from outside of the United States	18.00%	17.00%	18.00%
Number of foreign countries greater than 10% revenue	0	0	0
Max amount percentage of revenue for single country	10.00%
United States [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	194,000	174,900
Foreign Locations [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 99,000	$ 81,000

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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