Stock Award Plans, Director Plan Outstanding and Exercisable Options (Details) - Director Plan [Member] - Employee Stock Option [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
First Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	$ 70.65
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 73.57
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	7,053
Weighted Average Remaining Contractual Life	6 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 71.85
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	6,278
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 71.75
Second Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	84.9
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 85.3
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	5,292
Weighted Average Remaining Contractual Life	4 years 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 85.1
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	5,292
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 85.1
Third Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	$ 99.52
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	18,000
Weighted Average Remaining Contractual Life	3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 99.52
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	18,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 99.52
Full Exercise Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	70.65
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 99.52
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	30,345
Weighted Average Remaining Contractual Life	2 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 90.57
Aggregate Intrinsic Value, Options Outstanding | $	$ 47
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	29,570
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 91.04
Aggregate Intrinsic Value, Options Exercisable | $	$ 42