Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property and equipment
Property and equipment, gross	$ 654,167	$ 335,302
Accumulated depreciation and amortization	(148,780)	(125,383)
Property and equipment, net	505,387	209,919
Land and land improvements [Member]
Property and equipment
Property and equipment, gross	130,358	39,837
Buildings and leasehold improvements [Member]
Property and equipment
Property and equipment, gross	372,232	185,878
Furniture, fixtures and equipment [Member]
Property and equipment
Property and equipment, gross	92,097	71,179
Software [Member]
Property and equipment
Property and equipment, gross	34,184	28,283
Assets under development [Member]
Property and equipment
Property and equipment, gross	$ 25,296	$ 10,125

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, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can 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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- Definition

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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