Capital Stock Repurchase Plan Transactions (Schedule Of Repurchased Capital Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Capital Stock Repurchase Plan Transactions [Abstract]
Total cost of repurchased shares	$ 49,861	$ 121,882	$ 77,214	$ 166,649
Shares repurchased	100,000	250,000	157,500	350,000
Weighted average price per share	$ 498.61	$ 487.52	$ 491.81	$ 476.14

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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