Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property and equipment
Gross property and equipment	$ 194,950	$ 137,452
Less accumulated depreciation and amortization	69,580	47,195
Net property and equipment	125,370	90,257
Land
Property and equipment
Gross property and equipment	19,954	19,954
Machinery and equipment
Property and equipment
Gross property and equipment	67,582	50,081
Furniture and fixtures
Property and equipment
Gross property and equipment	22,280	13,794
Leasehold improvements
Property and equipment
Gross property and equipment	$ 85,134	$ 53,623

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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