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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, 2024 | Dec. 31, 2023
Asset-Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 1,498 | $ 2,179
Realized gains/(losses) | 1,542 | 1,007
Redemptions | (2,006) | (1,688)
Net change | (464) | (681)
Ending Balance | 1,034 | 1,498
Syndicated Loans [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 82,964 | 69,888
Unrealized gains/(losses) | 1,673 | (15)
Realized gains/(losses) | (3,252) | (2,161)
Purchases | 54,335 | 69,881
Sales | (49,810) | (35,988)
Redemptions | (25,718) | (18,641)
Transfers out of Level 3 | (1,725) |
Net change | (24,497) | 13,076
Ending Balance | 58,467 | 82,964
Corporate Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 11,878 | 11,878
Unrealized gains/(losses) | 3,687 |
Net change | 3,687 |
Ending Balance | 15,565 | 11,878
Auction Rate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 783 | 14,681
Unrealized gains/(losses) |  | 2
Realized gains/(losses) |  | (232)
Redemptions | (225) | (13,668)
Net change | (225) | (13,898)
Ending Balance | 558 | 783
Other Investment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 39,467 | 36,974
Unrealized gains/(losses) | (119) | 993
Realized gains/(losses) |  | 0
Purchases |  | 1,500
Transfers out of Level 3 | (25,000) |
Net change | (25,119) | 2,493
Ending Balance | $ 14,348 | $ 39,467

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