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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, 2022 | Sep. 30, 2022
Asset-Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 45,211 | $ 64,706
Unrealized gains/(losses) |  | 4,750
Realized gains | 539 | 2,316
Purchases | 1,559 | 3,149
Redemptions | 2,193 | 29,805
Net change | (95) | (19,590)
Ending Balance | 45,116 | 45,116
Corporate Equity Securities Financial Instruments Owned [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 1,013 | 225
Unrealized gains/(losses) |  | 839
Realized gains |  | 336
Sales |  | (387)
Net change | 0 | 788
Ending Balance | 1,013 | 1,013
Other Financial instruments owned [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 100,187 | 26,857
Unrealized gains/(losses) | 338 | 550
Realized gains | 225 | 793
Purchases | 25,729 | 133,933
Sales | (51,824) | (85,042)
Redemptions | 4,078 | 6,514
Net change | (29,610) | 43,720
Ending Balance | 70,577 | 70,577
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 | 0 | 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 | 13,965 | 13,032
Unrealized gains/(losses) | 511 | 1,444
Net change | 511 | 1,444
Ending Balance | 14,476 | 14,476
Other Investment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 34,779 | 35,837
Unrealized gains/(losses) | 0 | (1,012)
Realized gains | 0 | 992
Sales |  | (999)
Redemptions |  | 39
Net change | 0 | (1,058)
Ending Balance | $ 34,779 | $ 34,779

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