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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022
Asset-Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 53,416 | $ 64,706
Unrealized gains/(losses) |  | 4,750
Realized gains | 104 | 1,777
Purchases | 1,590 | 1,590
Redemptions | 9,899 | 27,612
Net change | (8,205) | (19,495)
Ending Balance | 45,211 | 45,211
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
Loans [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 34,960 | 26,857
Unrealized gains/(losses) | 152 | 212
Realized gains | 243 | 568
Purchases | 74,982 | 108,204
Sales | (8,318) | (33,218)
Redemptions | 1,832 | 2,436
Net change | 65,227 | 73,330
Ending Balance | 100,187 | 100,187
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 | 13,743 | 13,032
Unrealized gains/(losses) | 222 | 933
Net change | 222 | 933
Ending Balance | 13,965 | 13,965
Other Investment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 34,725 | 35,837
Unrealized gains/(losses) | 54 | (1,012)
Realized gains | 0 | 992
Sales |  | (999)
Redemptions |  | 39
Net change | 54 | (1,058)
Ending Balance | $ 34,779 | $ 34,779

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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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