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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
Asset-Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 1,979 | $ 2,179
Realized gains/(losses) | 502 | 728
Redemptions | (812) | (1,238)
Net change | (310) | (510)
Ending Balance | 1,669 | 1,669
Syndicated Loans [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 105,541 | 69,888
Unrealized gains/(losses) | (158) | (72)
Realized gains/(losses) | (1,323) | (1,396)
Purchases | 13,909 | 68,669
Sales | (26,869) | (31,438)
Redemptions | (2,583) | (17,134)
Net change | (17,024) | 18,629
Ending Balance | 88,517 | 88,517
Corporate Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 11,878 | 11,878
Ending Balance | 11,878 | 11,878
Auction Rate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 14,683 | 14,681
Unrealized gains/(losses) |  | 2
Realized gains/(losses) | (232) | (232)
Redemptions | (13,668) | (13,668)
Net change | (13,900) | (13,898)
Ending Balance | 783 | 783
Other Investment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 37,342 | 36,974
Unrealized gains/(losses) | 368 | 736
Purchases | 1,500 | 1,500
Net change | 1,868 | 2,236
Ending Balance | $ 39,210 | $ 39,210

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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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