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Investments and Other Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Marketable Securities [Abstract] |
Schedule of Investments | Investments on the accompanying Consolidated Balance Sheets consist of:
|  | September 30, 2025 |  | December 31, 2024
Available for sale and equity securities |  | $ | 221,315 |  |  | $ | 183,656 |
Investments in affiliated funds |  | 10,522 |  |  | 8,129 |
Investments in limited partnership funds |  | 865 |  |  | — |
Equity method investments (See Note 2) |  | 61,163 |  |  | 123,782 |
Total |  | $ | 293,865 |  |  | $ | 315,567 |
Schedule of Available-for-Sale and Equity Securities | Available for sale and equity securities consist of:
| At September 30, 2025
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 172,986 |  |  | $ | — |  |  | $ | (5,165) |  |  | $ | 167,821 |
SEI-sponsored investment products | 44,348 |  |  | 2,470 |  |  | — |  |  | 46,818 |
Equities and other investment products | 5,993 |  |  | 683 |  |  | — |  |  | 6,676 |
| $ | 223,327 |  |  | $ | 3,153 |  |  | $ | (5,165) |  |  | $ | 221,315 |
| At December 31, 2024
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 154,211 |  |  | $ | — |  |  | $ | (11,085) |  |  | $ | 143,126 |
SEI-sponsored investment products | 33,029 |  |  | 1,615 |  |  | — |  |  | 34,644 |
Equities and other investment products | 5,554 |  |  | 332 |  |  | — |  |  | 5,886 |
| $ | 192,794 |  |  | $ | 1,947 |  |  | $ | (11,085) |  |  | $ | 183,656 |
Schedule of Available-for-Sale Debt Securities by Maturity | The following tables provide the scheduled maturities of the Company's available-for-sale debt securities:
|  | At September 30, 2025
|  | Cost |  | Fair Value
Within one year |  | $ | — |  |  | $ | — |
After one year through five years |  | 3,625 |  |  | 3,296 |
After 5 years through 10 years |  | 16,008 |  |  | 14,905 |
After 10 years |  | 153,353 |  |  | 149,620 |
|  | $ | 172,986 |  |  | $ | 167,821 |
|  | At December 31, 2024
|  | Cost |  | Fair Value
Within one year |  | $ | — |  |  | $ | — |
After one year through five years |  | 4,132 |  |  | 3,763 |
After 5 years through 10 years |  | 20,323 |  |  | 18,429 |
After 10 years |  | 129,756 |  |  | 120,934 |
|  | $ | 154,211 |  |  | $ | 143,126 |

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