Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - SARs - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward]
Number Of Shares, Outstanding Beginning Balance	35	36
Number Of Shares, SARs granted	0	5
Number Of Shares, SARS exercised	(4)	(6)
Number Of Shares, Outstanding Ending Balance	31	35	36
Number Of Shares, Exercisable as of March 31, 2022	26
Number Of Shares, Unvested as of March 31, 2022	5
Share-based Compensation Arrangement by Share-based Payment Award, SARs, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 150.36	$ 139.16
Weighted Average Exercise Price, SARs granted	0	184.26
Weighted Average Exercise Price, SARS exercised	89.23	106.71
Weighted Average Exercise Price, Outstanding Ending Balance	158.22	$ 150.36	$ 139.16
Weighted Average Exercise Price, Exercisable as of March 31, 2022	161.73
Weighted Average Exercise Price, Unvested as of March 31, 2022	$ 141.50
Average Remaining Contractual Term, Outstanding Beginning Balance	4 years 7 days	3 years 11 months 15 days	4 years 4 months 17 days
Average Remaining Contractual Term, Outstanding Ending Balance	4 years 7 days	3 years 11 months 15 days	4 years 4 months 17 days
Average Remaining Contractual Term, Exercisable as of March 31, 2022	3 years 9 months 3 days
Average Remaining Contractual Term, Unvested as of March 31, 2022	5 years 3 months
Aggregate Intrinsic Value, Outstanding Beginning Balance	$ 1,643	$ 903
Aggregate Intrinsic Value, Outstanding Ending Balance	1,400	$ 1,643	$ 903
Aggregate Intrinsic Value, Exercisable as of March 31, 2022	1,067
Aggregate Intrinsic Value, Unvested as of March 31, 2022	$ 333