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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				9 Months Ended	12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward]
Number Of Shares, SARs granted	5		4	7
SARs
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward]
Number Of Shares, Outstanding Beginning Balance		36		30	36	30
Number Of Shares, SARs granted		0			5	14
Number Of Shares, SARS exercised					(3)	(8)
Number Of Shares, Outstanding Ending Balance					38	36	30
Number Of Shares, Exercisable as of September 30, 2021					29
Number Of Shares, Unvested as of September 30, 2021					9
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	$ 139.16	$ 124.13
Weighted Average Exercise Price, SARs granted					184.26	137.40
Weighted Average Exercise Price, SARS exercised					68.70	75.75
Weighted Average Exercise Price, Outstanding Ending Balance					150.06	$ 139.16	$ 124.13
Weighted Average Exercise Price, Exercisable as of September 30, 2021					149.50
Weighted Average Exercise Price, Unvested as of September 30, 2021					$ 151.80
Average Remaining Contractual Term, Outstanding Beginning Balance					4 years 3 months 21 days	4 years 4 months 17 days	3 years 6 months 10 days
Average Remaining Contractual Term, Outstanding Ending Balance					4 years 3 months 21 days	4 years 4 months 17 days	3 years 6 months 10 days
Average Remaining Contractual Term, Exercisable as of September 30, 2021					3 years 9 months 7 days
Average Remaining Contractual Term, Unvested as of September 30, 2021					5 years 11 months 15 days
Aggregate Intrinsic Value, Outstanding Beginning Balance		$ 903		$ 1,352	$ 903	$ 1,352
Aggregate Intrinsic Value, Outstanding Ending Balance					1,317	$ 903	$ 1,352
Aggregate Intrinsic Value, Exercisable as of September 30, 2021					1,028
Aggregate Intrinsic Value, Unvested as of September 30, 2021					$ 289

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