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Capital Stock Repurchase Plan Transactions (Schedule Of Repurchased Capital Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Capital Stock Repurchase Plan Transactions [Abstract]
Total cost of repurchased shares	$ 14,344	$ 23,884	$ 27,769	$ 101,098
Shares repurchased	28,457	50,000	53,457	207,500
Weighted average price per share	$ 504.07	$ 477.68	$ 519.46	$ 487.22

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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