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Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - Senior Notes [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Interest expense incurred | $ 62,328 | $ 27,587 | $ 19,472
4.868% Senior Notes due 6/1/2044 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense incurred | $ 19,472 | 19,472 | 19,472
Debt instrument, stated interest rate | 4.868% |  |
3.5% Senior Notes due 10/15/2050 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense incurred | $ 35,221 | 8,115 |
Debt instrument, stated interest rate | 3.50% |  |
3.125% Senior Notes due 10/15/2052 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense incurred | $ 7,635 |  |
Debt instrument, stated interest rate | 3.125% |  |

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