Fixed Assets (Summary Of Fixed Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Fixed Assets [Abstract]
Furniture and equipment	$ 154,497		$ 154,497		$ 147,210
Building and leasehold improvements	78,107		78,107		77,192
Total	232,604		232,604		224,402
Less accumulated depreciation and amortization	(136,216)		(136,216)		(119,662)
Fixed assets, net	96,388		96,388		104,740
Depreciation and amortization of furniture and equipment, and leasehold improvements	$ 7,400	$ 7,000	$ 21,958	$ 19,124

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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