Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - Senior Notes [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 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	397,254	$ 397,194
Market Value	$ 505,284	$ 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	979,784	$ 979,524
Market Value	$ 1,068,990	$ 1,138,100
Debt instrument, stated interest rate	3.50%

Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date the debt instrument was issued, in CCYY-MM-DD format.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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.

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