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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, 2022 | Dec. 31, 2021
Asset-Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 64,706 | $ 9
Unrealized gains | $ 4,789 | $ (3,002)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Realized gains | $ 4,287 | $ 9,485
Purchases | 4,820 | 68,104
Redemptions | (76,423) | (16,750)
Transfers into Level 3 |  | 6,930
Transfers out of Level 3 |  | (70)
Net change | (62,527) | 64,697
Ending Balance | 2,179 | 64,706
Corporate Equity Securities Financial Instruments Owned [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 225 |
Realized gains | 1,621 |
Sales | (1,846) |
Transfers into Level 3 |  | 225
Net change | (225) | 225
Ending Balance |  | 225
Syndicated Loans [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 26,857 | 11,275
Unrealized gains | $ 550 | $ (68)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Realized gains | $ 2,653 |
Purchases | 227,548 | $ 23,600
Sales | (177,895) | (7,725)
Redemptions | (9,825) |
Transfers out of Level 3 |  | (225)
Net change | 43,031 | 15,582
Ending Balance | 69,888 | 26,857
Corporate Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 5,754 |
Unrealized gains | $ 6,124 | $ (1,000)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Purchases |  | $ 3,000
Sales |  | (2,000)
Transfers into Level 3 |  | 5,754
Net change | $ 6,124 | 5,754
Ending Balance | 11,878 | 5,754
Auction Rate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 13,032 | 12,933
Unrealized gains | $ 1,649 | $ 124
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Redemptions |  | $ (25)
Net change | $ 1,649 | 99
Ending Balance | 14,681 | 13,032
Other Investment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 35,837 | 42,113
Unrealized gains | $ 1,183 | $ 654
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax | OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Realized gains | $ 992 |
Sales | (999) |
Redemptions | (39) |
Transfers out of Level 3 |  | $ (6,930)
Net change | 1,137 | (6,276)
Ending Balance | $ 36,974 | $ 35,837

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