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Information by Segment and Geographic Area (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Information by Geographic Area
Revenues from Unaffiliated Customers	$ 3,302,740	$ 3,038,678	$ 2,990,577
Net Property, Plant and Equipment	1,274,484	1,366,973	1,510,801
United States
Information by Geographic Area
Revenues from Unaffiliated Customers	1,087,454	1,010,290	1,010,076
Net Property, Plant and Equipment	276,966	291,470	326,952
United Kingdom
Information by Geographic Area
Revenues from Unaffiliated Customers	398,222	420,458	436,039
Net Property, Plant and Equipment	114,521	141,014	205,681
All Other
Information by Geographic Area
Revenues from Unaffiliated Customers	1,817,064	1,607,930	1,544,462
Net Property, Plant and Equipment	$ 882,997	$ 934,489	$ 978,168

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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