SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment	$ 442,112	$ 478,982
Less: accumulated depreciation and amortization	(302,281)	(300,033)
Net property and equipment	139,831	178,949
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	292,224	286,277
Buildings (1)
Property, Plant and Equipment [Line Items]
Property and equipment	60,059	93,538
Corporate aircraft (1)
Property, Plant and Equipment [Line Items]
Property and equipment	0	11,461
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	70,630	67,037
Land
Property, Plant and Equipment [Line Items]
Property and equipment	11,014	19,816
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment	8,185	$ 853
Building and corporate aircraft | Prepaid expenses and other current assets
Property, Plant and Equipment [Line Items]
Held-for-sale assets	35,000
Fair value of assets held for sale	$ 64,000