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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment	$ 478,982	$ 489,976
Less: accumulated depreciation and amortization	(300,033)	(281,553)
Net property and equipment	178,949	208,423
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	286,277	283,378
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment	93,538	112,410
Corporate aircraft
Property, Plant and Equipment [Line Items]
Property and equipment	11,461	11,461
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	67,037	61,539
Land
Property, Plant and Equipment [Line Items]
Property and equipment	19,816	20,146
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment	$ 853	$ 1,042

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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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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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