SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated Useful Lives of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 134,267	$ 117,400
Building [Member]
Property, Plant and Equipment [Line Items]
Useful Life	39 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	Useful Life, Shorter of Lease Term or Asset Utility [Member]
Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 40,000	56,900
Equipment and Furniture [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Equipment and Furniture [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	7 years
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 43,400	$ 46,700
Computer Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	2 years
Computer Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	7 years
Leased copiers
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	Useful Life, Shorter of Lease Term or Asset Utility [Member]
Leased fleet
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	Useful Life, Shorter of Lease Term or Asset Utility [Member]