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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, 2021 | Sep. 30, 2021
Asset-Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 1,815 | $ 9
Unrealized gains/(losses) |  | (3,000)
Realized gains |  | 7,361
Purchases | 68,028 | 68,104
Redemptions | (839) | (10,400)
Transfers out of Level 3 | (70) | (70)
Category transfers |  | 6,930
Net change | 67,119 | 68,925
Ending Balance | 68,934 | 68,934
Loans [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 22,839 | 11,275
Unrealized gains/(losses) |  | (48)
Purchases | 3,365 | 14,977
Sales | (7,350) | (7,350)
Net change | (3,985) | 7,579
Ending Balance | 18,854 | 18,854
Corporate Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 8,754 |
Unrealized gains/(losses) | (1,000) | (1,000)
Purchases |  | 3,000
Transfers into Level 3 |  | 5,754
Net change | (1,000) | 7,754
Ending Balance | 7,754 | 7,754
Auction Rate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 12,959 | 12,933
Unrealized gains/(losses) | (47) | (21)
Net change | (47) | (21)
Ending Balance | 12,912 | 12,912
Other Investment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 34,666 | 42,113
Unrealized gains/(losses) | 1,299 | 782
Category transfers |  | (6,930)
Net change | 1,299 | (6,148)
Ending Balance | $ 35,965 | $ 35,965

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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