GOODWILL, TRADE NAMES, AND OTHER INTANGIBLE ASSETS - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 78,572	$ 78,572
Accumulated Amortization	38,029	36,228
Net Carrying Amount	40,543	42,344
Trade names, indefinite-lived	5,900	5,900
Databases
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	30,530	30,530
Accumulated Amortization	19,138	18,375
Net Carrying Amount	11,392	12,155
Customer relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	47,738	47,738
Accumulated Amortization	18,603	17,581
Net Carrying Amount	29,135	30,157
Non-compete agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	304	304
Accumulated Amortization	288	272
Net Carrying Amount	$ 16	$ 32