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Segment and Geographic Area Information (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Property & equipment	$ 1,643,589	$ 1,444,177
North American & European Operations [Member]
Segment Reporting Information [Line Items]
Property & equipment	1,120,121	1,000,350
Australian Operations [Member]
Segment Reporting Information [Line Items]
Property & equipment	$ 523,468	$ 443,827

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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