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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, 2021 | Dec. 31, 2020
Asset-Backed Securities [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning Balance |  | $ 9 |
Unrealized gains/(losses) |  | (3,002) |
Realized gains/(losses) |  | 9,485 |
Purchases |  | 68,104 |
Redemptions |  | 16,750 |
Transfers into Level 3 |  | 6,930 |
Transfers out of Level 3 |  | 70 |
Net change |  | 64,697 |
Ending Balance |  | 64,706 | $ 9
Corporate Equity Securities Financial Instruments Owned [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Transfers into Level 3 |  | 225 |
Net change |  | 225 |
Ending Balance |  | 225 |
Loans [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning Balance |  | 11,275 |
Unrealized gains/(losses) |  | (68) |
Purchases |  | 23,600 |
Sales |  | 7,725 |
Transfers out of Level 3 |  | 225 |
Net change |  | 15,582 |
Ending Balance |  | 26,857 | 11,275
Other Financial Instrument Owned [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning Balance | [1] | 11,284 | 9,326
Unrealized gains/(losses) | [1] |  | (3,126)
Realized gains/(losses) | [1] |  | (71)
Purchases | [1] |  | 25,852
Sales | [1] |  | 20,000
Redemptions | [1] |  | 697
Net change | [1] |  | 1,958
Ending Balance | [1] |  | 11,284
Corporate Equity Securities [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning Balance |  |  | 1,060
Unrealized gains/(losses) |  | (1,000) |
Purchases |  | 3,000 |
Sales |  | 2,000 |
Transfers into Level 3 |  | 5,754 |
Transfers out of Level 3 |  |  | (1,060)
Net change |  | 5,754 | (1,060)
Ending Balance |  | 5,754 |
Equity Auction Rate Securities [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning Balance |  | 12,933 | 14,427
Unrealized gains/(losses) |  | 124 | (1,494)
Redemptions |  | 25 |
Net change |  | 99 | (1,494)
Ending Balance |  | 13,032 | 12,933
Other Investment [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning Balance |  | 42,113 | 853
Unrealized gains/(losses) |  | 654 | (296)
Sales |  |  | (20)
Transfers into Level 3 |  |  | 41,576
Transfers out of Level 3 |  | 6,930 |
Net change |  | (6,276) | 41,260
Ending Balance |  | $ 35,837 | $ 42,113
[1] | Includes asset-backed securities and loans.

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