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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				6 Months Ended	12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 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				38	36	30
Number Of Shares, Exercisable as of June 30, 2021	28				28
Number Of Shares, Unvested as of June 30, 2021	10				10
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				150.06	$ 139.16	$ 124.13
Weighted Average Exercise Price, Exercisable as of June 30, 2021	148.09				148.09
Weighted Average Exercise Price, Unvested as of June 30, 2021	$ 155.32				$ 155.32
Average Remaining Contractual Term, Outstanding Beginning Balance					4 years 6 months 21 days	4 years 4 months 17 days	3 years 6 months 10 days
Average Remaining Contractual Term, Outstanding Ending Balance					4 years 6 months 21 days	4 years 4 months 17 days	3 years 6 months 10 days
Average Remaining Contractual Term, Exercisable as of June 30, 2021					3 years 10 months 28 days
Average Remaining Contractual Term, Unvested as of June 30, 2021					6 years 3 months 10 days
Aggregate Intrinsic Value, Outstanding Beginning Balance		$ 903		$ 1,352	$ 903	$ 1,352
Aggregate Intrinsic Value, Outstanding Ending Balance	$ 1,122				1,122	$ 903	$ 1,352
Aggregate Intrinsic Value, Exercisable as of June 30, 2021	889				889
Aggregate Intrinsic Value, Unvested as of June 30, 2021	$ 233				$ 233

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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