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Fixed Assets - Schedule of Fixed Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Cost	$ 226,579	$ 210,633
Accumulated Depreciation	(136,166)	(129,579)	$ (128,546)
Net Book Value	90,413	81,054
Computers, furniture and fixtures
Property, Plant and Equipment [Line Items]
Cost	93,850	93,224
Accumulated Depreciation	(74,766)	(69,687)
Net Book Value	19,084	23,537
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Cost	132,729	117,409
Accumulated Depreciation	(61,400)	(59,892)
Net Book Value	$ 71,329	$ 57,517

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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