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Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Asset-Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 2,179 | $ 64,706
Unrealized gains/(losses) |  | 4,789
Realized gains/(losses) | 1,007 | 4,287
Purchases |  | 4,820
Redemptions | (1,688) | (76,423)
Net change | (681) | (62,527)
Ending Balance | 1,498 | 2,179
Corporate Equity Securities Financial Instruments Owned [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance |  | 225
Realized gains/(losses) |  | 1,621
Sales |  | (1,846)
Net change |  | (225)
Syndicated Loans [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 69,888 | 26,857
Unrealized gains/(losses) | (15) | 550
Realized gains/(losses) | (2,161) | 2,653
Purchases | 69,881 | 227,548
Sales | (35,988) | (177,895)
Redemptions | (18,641) | (9,825)
Net change | 13,076 | 43,031
Ending Balance | 82,964 | 69,888
Corporate Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 11,878 | 5,754
Unrealized gains/(losses) |  | 6,124
Net change |  | 6,124
Ending Balance | 11,878 | 11,878
Auction Rate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 14,681 | 13,032
Unrealized gains/(losses) | 2 | 1,649
Realized gains/(losses) | (232) |
Redemptions | (13,668) |
Net change | (13,898) | 1,649
Ending Balance | 783 | 14,681
Other Investment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 36,974 | 35,837
Unrealized gains/(losses) | 993 | 1,183
Realized gains/(losses) |  | 992
Purchases | 1,500 |
Sales |  | (999)
Redemptions |  | (39)
Net change | 2,493 | 1,137
Ending Balance | $ 39,467 | $ 36,974

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis realized asset gain loss included in earnings. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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