SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Balances Related to Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 115,372	$ 118,743
Less accumulated depreciation	(96,937)	(95,024)
Property and equipment, net	18,435	23,719
Building and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,100	9,000
Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	54,700	53,100
Finance Leases [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,500	5,900
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 47,000	$ 50,700

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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