OVERVIEW AND BASIS OF PRESENTATION (Details)	12 Months Ended
	Dec. 31, 2020
Building
Property Plant and Equipment Line Items
Useful life	30 years
Furniture And Fixtures
Property Plant and Equipment Line Items
Useful life	5 years
Leasehold Improvements
Property Plant and Equipment Line Items
Useful life	10 years
Minimum | Computer Equipment and software
Property Plant and Equipment Line Items
Useful life	3 years
Minimum | Telephone Equipment
Property Plant and Equipment Line Items
Useful life	4 years
Minimum | Other
Property Plant and Equipment Line Items
Useful life	3 years
Minimum | Software and Software Development Costs [Member]
Property Plant and Equipment Line Items
Useful life	4 years
Minimum | Other Intangible Assets
Property Plant and Equipment Line Items
Useful life	2 years
Maximum | Computer Equipment and software
Property Plant and Equipment Line Items
Useful life	7 years
Maximum | Telephone Equipment
Property Plant and Equipment Line Items
Useful life	7 years
Maximum | Other
Property Plant and Equipment Line Items
Useful life	7 years
Maximum | Software and Software Development Costs [Member]
Property Plant and Equipment Line Items
Useful life	7 years
Maximum | Other Intangible Assets
Property Plant and Equipment Line Items
Useful life	12 years