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Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - Senior Notes [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
4.868% Senior notes due 6/1/2044 [Member] |  |
Debt Instrument [Line Items] |  |
Date issued | Jun. 05, 2014 |
Date due | Jun. 01, 2044 | Jun. 01, 2044
Original Principal Amount | $ 400,000 |
Consolidated Balance Sheet Amount | 397,224 | $ 397,194
Market Value | $ 479,616 | $ 528,000
Debt instrument, stated interest rate | 4.868% |
3.5% Senior notes due 10/15/2050 [Member] |  |
Debt Instrument [Line Items] |  |
Date issued | Oct. 07, 2020 |
Date due | Oct. 15, 2050 | Oct. 15, 2050
Original Principal Amount | $ 1,000,000 |
Consolidated Balance Sheet Amount | 979,654 | $ 979,524
Market Value | $ 976,480 | $ 1,138,100
Debt instrument, stated interest rate | 3.50% |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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