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Segment Information (Schedule Of Property And Equipment By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property and equipment, net	$ 320,282	$ 246,317
United States [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property and equipment, net	287,471	221,030
All Other Countries [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property and equipment, net	$ 32,811	$ 25,287

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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