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Investments (Tables)
 12 Months Ended
Dec. 31, 2023
Schedule of Investments [Abstract]  
Schedule of Investments The Company's investments, excluding the assets of CIP discussed in Note 20, at December 31, 2023 and 2022, were as follows: 
 December 31,
(in thousands)20232022
Investment securities - fair value$97,304 $76,999 
Equity method investments (1)22,710 11,448 
Nonqualified retirement plan assets12,682 10,154 
Other investments— 1,729 
Total investments$132,696 $100,330 
(1)The Company's equity method investments are valued on a three-month lag based upon the availability of financial information. On January 1, 2023, the Company made an additional investment in an existing minority interest in an affiliated manager for $11.6 million including transaction costs.
Schedule of Marketable Securities The composition of the Company's investment securities - fair value was as follows: 
December 31, 2023December 31, 2022
(in thousands)CostFair
Value		CostFair
Value
Investment Securities - fair value:
Sponsored funds$80,794 $77,433 $67,472 $62,744 
Equity securities16,353 19,871 13,440 14,255 
Total investment securities - fair value$97,147 $97,304 $80,912 $76,999