Property, Equipment and Software, Net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Summary of Property, Equipment and Software, Net
Property, Equipment and Software, Gross	$ 313,726	$ 271,650
Less accumulated depreciation and amortization	(203,124)	(174,683)
Property, Equipment and Software, Net	110,602	96,967
Leasehold improvements [Member]
Summary of Property, Equipment and Software, Net
Property, Equipment and Software, Gross	46,150	35,997
Furniture and fixtures [Member]
Summary of Property, Equipment and Software, Net
Property, Equipment and Software, Gross	23,666	21,742
Equipment [Member]
Summary of Property, Equipment and Software, Net
Property, Equipment and Software, Gross	63,303	60,924
Software [Member]
Summary of Property, Equipment and Software, Net
Property, Equipment and Software, Gross	$ 180,607	$ 152,987

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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