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Capital Stock Repurchase Plan Transactions (Schedule Of Repurchased Capital Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capital Stock Transactions [Abstract]
Total cost of repurchased shares	$ 576,483	$ 175,594	$ 92,631
Shares repurchased	1,195,529	384,252	269,009
Weighted average price per share	$ 482.20	$ 456.98	$ 344.34

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

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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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