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Segment and Geographic Area Information (Details 4) (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
Percent of Total Property and Equipment	100.00%	100.00%
United States [Member]
Segment Reporting Information [Line Items]
Property & equipment	993,665	892,295
Percent of Total Property and Equipment	60.50%	61.80%
Australia [Member]
Segment Reporting Information [Line Items]
Property & equipment	523,468	443,827
Percent of Total Property and Equipment	31.80%	30.70%
Canada [Member]
Segment Reporting Information [Line Items]
Property & equipment	110,719	91,434
Percent of Total Property and Equipment	6.70%	6.30%
Europe [Member]
Segment Reporting Information [Line Items]
Property & equipment	15,737	16,621
Percent of Total Property and Equipment	1.00%	1.20%
Total Non-United States
Segment Reporting Information [Line Items]
Property & equipment	$ 649,924	$ 551,882
Percent of Total Property and Equipment	39.50%	38.20%

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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