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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Marketable Securities [Abstract] |
Schedule of Available For Sale and Equity Securities | Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of:
|  | At December 31, 2023
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available for sale debt securities |  | $ | 127,681 |  |  | $ | — |  |  | $ | (8,929) |  |  | $ | 118,752 |
SEI-sponsored mutual funds |  | 30,427 |  |  | 818 |  |  | (19) |  |  | 31,226 |
Equities and other mutual funds |  | 5,301 |  |  | 134 |  |  | — |  |  | 5,435 |
|  | $ | 163,409 |  |  | $ | 952 |  |  | $ | (8,948) |  |  | $ | 155,413 |
|  | At December 31, 2022
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available for sale debt securities |  | $ | 129,372 |  |  | $ | — |  |  | $ | (12,071) |  |  | $ | 117,301 |
SEI-sponsored mutual funds |  | 6,207 |  |  | — |  |  | (176) |  |  | 6,031 |
Equities and other mutual funds |  | 5,026 |  |  | — |  |  | (157) |  |  | 4,869 |
|  | $ | 140,605 |  |  | $ | — |  |  | $ | (12,404) |  |  | $ | 128,201 |
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 December 31, 2023
|  | Cost |  | Fair Value
Within one year |  | $ | — |  |  | $ | — |
After one year through five years |  | 5,679 |  |  | 5,035 |
After 5 years through 10 years |  | 31,162 |  |  | 28,084 |
After 10 years |  | 90,840 |  |  | 85,633 |
|  | $ | 127,681 |  |  | $ | 118,752 |
|  | At December 31, 2022
|  | Cost |  | Fair Value
Within one year |  | $ | 10 |  |  | $ | 9 |
After one year through five years |  | 4,299 |  |  | 3,800 |
After 5 years through 10 years |  | 21,398 |  |  | 18,929 |
After 10 years |  | 103,665 |  |  | 94,563 |
|  | $ | 129,372 |  |  | $ | 117,301 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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