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Furniture, equipment and leasehold improvements - Summary of Office Facilities Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Office facilities, gross	$ 134,493	$ 120,821
Less accumulated depreciation	(97,751)	(92,785)
Total	36,742	28,036	[1]
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Office facilities, gross	76,070	63,334
Leasehold improvements
Property, Plant and Equipment [Line Items]
Office facilities, gross	$ 58,423	$ 57,487
[1] (1) Certain prior period reported amounts were reclassified to conform to the current period presentation, See Note 2.

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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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