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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
	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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- Definition

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

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