GOODWILL AND OTHER INTANGIBLES - Schedule of Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Goodwill and Other Intangible Assets [Line Items]
Cost	$ 136,577	$ 136,616
Accumulated Amortization	(130,552)	(129,614)
Net Book Value	6,025	7,002
Client-related
Goodwill and Other Intangible Assets [Line Items]
Cost	63,111	63,117
Accumulated Amortization	(60,371)	(60,035)
Net Book Value	2,740	3,082
Technology
Goodwill and Other Intangible Assets [Line Items]
Cost	68,105	68,138
Accumulated Amortization	(64,820)	(64,218)
Net Book Value	3,285	3,920
Other
Goodwill and Other Intangible Assets [Line Items]
Cost	5,361	5,361
Accumulated Amortization	(5,361)	(5,361)
Net Book Value	$ 0	$ 0
Minimum | Client-related
Goodwill and Other Intangible Assets [Line Items]
Useful Lives	4 years	4 years
Minimum | Technology
Goodwill and Other Intangible Assets [Line Items]
Useful Lives	2 years	2 years
Minimum | Other
Goodwill and Other Intangible Assets [Line Items]
Useful Lives	1 year	1 year
Maximum | Client-related
Goodwill and Other Intangible Assets [Line Items]
Useful Lives	10 years	10 years
Maximum | Technology
Goodwill and Other Intangible Assets [Line Items]
Useful Lives	10 years	10 years
Maximum | Other
Goodwill and Other Intangible Assets [Line Items]
Useful Lives	5 years	5 years