Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of property and equipment
Property, plant and equipment, Gross	$ 57,081	$ 41,885
Less: accumulated depreciation and amortization	(29,720)	(23,187)
Property, Plant and Equipment net excluding construction in progress	27,361	18,698
Construction in progress	7,971	8,142
Total Property, Plant and Equipment	35,332	26,840
Computers and equipment [Member]
Summary of property and equipment
Property, plant and equipment, Gross	14,137	11,562
Software [Member]
Summary of property and equipment
Property, plant and equipment, Gross	24,371	19,487
Furniture and fixtures [Member]
Summary of property and equipment
Property, plant and equipment, Gross	8,188	5,879
Leasehold improvements [Member]
Summary of property and equipment
Property, plant and equipment, Gross	$ 10,385	$ 4,957

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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