GOODWILL, TRADE NAMES, AND OTHER INTANGIBLE ASSETS - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Intangible assets subject to amortization:
Gross Carrying Amount	$ 83,202	$ 78,572
Accumulated Amortization	40,339	36,228
Net Carrying Amount	42,863	42,344
Intangible assets not subject to amortization:
Trade names, indefinite-lived	5,900	5,900
Databases
Intangible assets subject to amortization:
Gross Carrying Amount	33,430	30,530
Accumulated Amortization	20,217	18,375
Net Carrying Amount	13,213	12,155
Customer relationships
Intangible assets subject to amortization:
Gross Carrying Amount	47,738	47,738
Accumulated Amortization	19,626	17,581
Net Carrying Amount	28,112	30,157
Non-compete agreements
Intangible assets subject to amortization:
Gross Carrying Amount	304	304
Accumulated Amortization	303	272
Net Carrying Amount	1	32
Trade names
Intangible assets subject to amortization:
Gross Carrying Amount	30	0
Accumulated Amortization	8	0
Net Carrying Amount	22	0
Software
Intangible assets subject to amortization:
Gross Carrying Amount	1,700	0
Accumulated Amortization	185	0
Net Carrying Amount	$ 1,515	$ 0