Goodwill, Trade Names, and Other Intangible Assets - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 78,572	$ 64,372
Accumulated Amortization	36,228	29,541
Net Carrying Amount	42,344	34,831
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	18,375	15,322
Net Carrying Amount	12,155	15,208
Customer relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	47,738	33,538
Accumulated Amortization	17,581	14,007
Net Carrying Amount	30,157	19,531
Non-compete agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	304	304
Accumulated Amortization	272	212
Net Carrying Amount	$ 32	$ 92