Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Components of Property and equipment
Property and Equipment, Gross	$ 69,967	$ 61,935
Accumulated depreciation and amortization	(41,107)	(40,868)
Property and Equipment ,Net	28,860	21,067
Leasehold improvements [Member]
Components of Property and equipment
Property and Equipment, Gross	6,379	8,324
Software [Member]
Components of Property and equipment
Property and Equipment, Gross	24,948	21,602
Furniture and equipment [Member]
Components of Property and equipment
Property and Equipment, Gross	15,174	10,765
Computers [Member]
Components of Property and equipment
Property and Equipment, Gross	$ 23,466	$ 21,244

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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