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Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - Senior Notes [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Interest expense incurred	$ 21,502	$ 13,673	$ 43,090	$ 27,346
4.868% Senior Notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 4,868	4,868	$ 9,736	9,736
Debt instrument, stated interest rate	4.868%		4.868%
3.5% Senior Notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 8,807	8,805	$ 17,614	17,610
Debt instrument, stated interest rate	3.50%		3.50%
3.125% Senior Notes due 10/15/2052 [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 7,827		$ 15,741
Debt instrument, stated interest rate	3.125%		3.125%

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

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