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Furniture, equipment and leasehold improvements - Summary of Office Facilities Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Office facilities, gross	$ 126,606	$ 134,493
Less accumulated depreciation	(82,732)	(97,751)
Total	43,874	36,742
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Office facilities, gross	63,473	76,070
Leasehold improvements
Property, Plant and Equipment [Line Items]
Office facilities, gross	$ 63,133	$ 58,423

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- 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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Amount before accumulated depreciation, depletion and amortization of 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, and furniture and fixtures.

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