Acquisitions - Narrative (Details) - USD ($) $ in Thousands	Apr. 01, 2023	Jan. 01, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill			$ 397,098	$ 348,836	$ 338,406
AlphaSimplex Group, LLC
Business Acquisition [Line Items]
Purchase price	$ 113,400
Goodwill	48,262
Definite-lived intangible assets acquired	55,400
Business acquisition, goodwill, expected tax deductible amount	$ 103,700
Goodwill and other intangible assets, amount expected to be tax deductible	15 years
Stone Harbor Investment Partners, LLC
Business Acquisition [Line Items]
Purchase price		$ 30,100
Goodwill		10,300
Definite-lived intangible assets acquired		$ 10,800