Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment	$ 62,034	$ 47,880
Less - accumulated depreciation and amortization	(35,172)	(29,823)
Total	26,862	18,057
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	6,891	5,776
Computer and related equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	6,918	5,414
Computer software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	32,871	27,306
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	5,417	4,633
Work-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 9,937	$ 4,751

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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