Earnings Per Common Share and Summary of Share-Based Award Transactions (Details) - SARs - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward]
Number Of Shares, Outstanding Beginning Balance	36	30
Number Of Shares, SARs granted	5	14
Number Of Shares, SARs exercised	(6)	(8)
Number Of Shares, Outstanding Ending Balance	35	36	30
Number Of Shares, Exercisable as of December 31, 2021	28
Number Of Shares, Unvested as of December 31, 2021	7
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 139.16	$ 124.13
Weighted Average Exercise Price, SARs granted	184.26	137.40
Weighted Average Exercise Price, SARs exercised	106.71	75.75
Weighted Average Exercise Price, Outstanding Ending Balance	150.36	$ 139.16	$ 124.13
Weighted Average Exercise Price, Exercisable as of December 31, 2021	151.17
Weighted Average Exercise Price, Unvested as of December 31, 2021	$ 147.41
Average Remaining Contractual Term, Outstanding Beginning Balance	3 years 11 months 15 days	4 years 4 months 17 days	3 years 6 months 10 days
Average Remaining Contractual Term, Exercisable as of December 31, 2021	3 years 6 months 3 days
Average Remaining Contractual Term, Unvested as of December 31, 2021	5 years 7 months 2 days
Aggregate Intrinsic Value, Outstanding Beginning Balance	$ 903	$ 1,352
Aggregate Intrinsic Value, Outstanding Ending Balance	1,643	$ 903	$ 1,352
Aggregate Intrinsic Value, Exercisable as of December 31, 2021	1,269
Aggregate Intrinsic Value, Unvested as of December 31, 2021	$ 374