Stock Award Plans, Employee Plan Outstanding and Exercisable Options (Details) - Employee Stock Award 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, upper limit (in dollars per share)	$ 64.89
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	15,500
Weighted Average Remaining Contractual Life	1 year 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 64.89
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	15,500
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 64.89
Second Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	73.29
Range of Exercise Prices, upper limit (in dollars per share)	$ 75.5
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	233,040
Weighted Average Remaining Contractual Life	2 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 74.29
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	233,040
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 74.29
Third Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	$ 84.9
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	6,705
Weighted Average Remaining Contractual Life	2 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 84.9
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	6,705
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 84.9
Full Exercise Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	64.89
Range of Exercise Prices, upper limit (in dollars per share)	$ 84.9
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	255,245
Weighted Average Remaining Contractual Life	2 years
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 74
Aggregate Intrinsic Value, Options Outstanding | $	$ 1,187
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	255,245
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 74
Aggregate Intrinsic Value, Options Exercisable | $	$ 1,187