Supplemental Consolidated Balance Sheet Information (Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Supplemental Consolidated Balance Sheet Information [Abstract]
Furniture, fixtures and equipment	$ 63,497	$ 60,935
Software	39,608	35,473
Leasehold improvements	40,052	39,410
Property and equipment, at cost	143,157	135,818
Less: accumulated depreciation and amortization	(97,815)	(94,680)
Property and equipment, net	$ 45,342	$ 41,138

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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