Goodwill, Trade Names, and Other Intangible Assets - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Intangible assets subject to amortization:
Gross Carrying Amount	$ 101,068	$ 82,902
Accumulated Amortization	52,500	44,079
Net Carrying Amount	48,568	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	45,930	33,430
Accumulated Amortization	24,971	22,033
Net Carrying Amount	20,959	11,397
Customer relationships
Intangible assets subject to amortization:
Gross Carrying Amount	52,538	47,738
Accumulated Amortization	26,286	21,672
Net Carrying Amount	26,252	26,066
Non-compete agreements
Intangible assets subject to amortization:
Gross Carrying Amount	0	4
Accumulated Amortization	0	3
Net Carrying Amount	0	1
Trade names
Intangible assets subject to amortization:
Gross Carrying Amount	900	30
Accumulated Amortization	548	16
Net Carrying Amount	352	14
Software
Intangible assets subject to amortization:
Gross Carrying Amount	1,700	1,700
Accumulated Amortization	695	355
Net Carrying Amount	$ 1,005	$ 1,345