Fixed Assets (Summary Of Fixed Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Fixed Assets [Abstract]
Furniture and equipment	$ 151,714		$ 151,714		$ 147,210
Building and leasehold improvements	76,054		76,054		77,192
Total	227,768		227,768		224,402
Less accumulated depreciation and amortization	(129,419)		(129,419)		(119,662)
Fixed assets, net	98,349		98,349		104,740
Depreciation and amortization of furniture and equipment, and leasehold improvements	$ 7,400	$ 6,500	$ 14,565	$ 12,070

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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