Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property and equipment
Gross property and equipment	$ 137,452	$ 81,210
Less accumulated depreciation and amortization	47,195	33,473
Net property and equipment	90,257	47,737
Land
Property and equipment
Gross property and equipment	19,954
Machinery and equipment
Property and equipment
Gross property and equipment	50,081	36,978
Furniture and fixtures
Property and equipment
Gross property and equipment	13,794	8,986
Leasehold improvements
Property and equipment
Gross property and equipment	$ 53,623	$ 35,246

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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