Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Cash equivalents	$ 157,635	$ 287,126
Investment securities - fair value
Fair Value	118,464	76,999
Debt securities	24,339
Total assets measured at fair value	287,427	374,279
Liabilities
Total liabilities measured at fair value	54,910	78,100
Contingent consideration
Liabilities
Total liabilities measured at fair value	54,910	78,100
Sponsored funds
Investment securities - fair value
Fair Value	76,958	62,744
Equity securities
Investment securities - fair value
Fair Value	17,167	14,255
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	11,328	10,154
Level 1
Assets
Cash equivalents	157,635	287,126
Investment securities - fair value
Debt securities	0
Total assets measured at fair value	263,088	374,279
Liabilities
Total liabilities measured at fair value	0	0
Level 1 \| Contingent consideration
Liabilities
Total liabilities measured at fair value	0	0
Level 1 \| Sponsored funds
Investment securities - fair value
Fair Value	76,958	62,744
Level 1 \| Equity securities
Investment securities - fair value
Fair Value	17,167	14,255
Level 1 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	11,328	10,154
Level 2
Assets
Cash equivalents	0	0
Investment securities - fair value
Debt securities	0
Total assets measured at fair value	0	0
Liabilities
Total liabilities measured at fair value	0	0
Level 2 \| Contingent consideration
Liabilities
Total liabilities measured at fair value	0	0
Level 2 \| Sponsored funds
Investment securities - fair value
Fair Value	0	0
Level 2 \| Equity securities
Investment securities - fair value
Fair Value	0	0
Level 2 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	0	0
Level 3
Assets
Cash equivalents	0	0
Investment securities - fair value
Debt securities	24,339
Total assets measured at fair value	24,339	0
Liabilities
Total liabilities measured at fair value	54,910	78,100
Level 3 \| Contingent consideration
Liabilities
Total liabilities measured at fair value	54,910	78,100
Level 3 \| Sponsored funds
Investment securities - fair value
Fair Value	0	0
Level 3 \| Equity securities
Investment securities - fair value
Fair Value	0	0
Level 3 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value of financial and nonfinancial obligations.

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