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SUBSEQUENT EVENTS (Notes)	12 Months Ended
SUBSEQUENT EVENTS (Notes)	Dec. 31, 2019
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On February 3, 2020, the Company acquired 100% of Deltix and its affiliates, a provider of software and services for quantitative research to the financial sector. The Company paid approximately $10,620 in cash at closing and could pay up to $18,975 in earn-out consideration based on achievement of certain revenue and earnings targets. In addition, the Company granted to Deltix employees 17,981 service-based RSUs and performance and service-based equity-settled awards that could pay up to $13,915 based on achievement of certain revenue and earnings targets.