GOODWILL, TRADE NAMES, AND OTHER INTANGIBLE ASSETS - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Intangible assets subject to amortization:
Gross Carrying Amount	$ 104,902	$ 82,902
Accumulated Amortization	47,716	44,079
Net Carrying Amount	57,186	38,823
Intangible assets not subject to amortization:
Trade names, indefinite-lived	5,900	5,900
Databases
Intangible assets subject to amortization:
Gross Carrying Amount	49,330	33,430
Accumulated Amortization	23,971	22,033
Net Carrying Amount	25,359	11,397
Customer relationships
Intangible assets subject to amortization:
Gross Carrying Amount	52,538	47,738
Accumulated Amortization	22,874	21,672
Net Carrying Amount	29,664	26,066
Non-compete agreements
Intangible assets subject to amortization:
Gross Carrying Amount	4	4
Accumulated Amortization	3	3
Net Carrying Amount	1	1
Trade names
Intangible assets subject to amortization:
Gross Carrying Amount	1,330	30
Accumulated Amortization	428	16
Net Carrying Amount	902	14
Software
Intangible assets subject to amortization:
Gross Carrying Amount	1,700	1,700
Accumulated Amortization	440	355
Net Carrying Amount	$ 1,260	$ 1,345