Fixed Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Cost	$ 168,706	$ 149,665
Accumulated Depreciation	(115,792)	(101,928)
Fixed assets, net	52,914	47,737
Computers, Furniture and Fixtures [Member]
Cost	111,356	100,373
Accumulated Depreciation	(83,537)	(73,521)
Fixed assets, net	27,819	26,852
Leasehold Improvements [Member]
Cost	57,350	49,292
Accumulated Depreciation	(32,255)	(28,407)
Fixed assets, net	$ 25,095	$ 20,885

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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