Stock Option Rollforward Table (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Text Block [Abstract]
Beginning outstanding, shares	351,561	395,353	540,441
Exercised	(247,920)	(43,792)	(145,088)
Ending outstanding, shares	103,641	351,561	395,353
Beginning outstanding, Weighted-average Exercise Price	$ 96.97	$ 96.37	$ 96.35
Weighted Average Exercise Price	96.95	91.60	96.27
Ending outstanding, Weighted-average Exercise Price	$ 97.01	$ 96.97	$ 96.37