Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property and equipment
Land and land improvements	$ 234,307	$ 217,811
Buildings	2,288,767	2,272,381
Furniture, fixtures and equipment	552,468	533,396
Construction in progress	48,982	59,822
Property and equipment, gross	3,124,524	3,083,410
Accumulated depreciation	(923,908)	(874,283)
Property and equipment, net	$ 2,200,616	$ 2,209,127

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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