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				6 Months Ended	12 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward]
Number Of Shares, Outstanding Beginning Balance		39		35	39	35
Number Of Shares, SARs granted	4	1	5	0	5	10
Number Of Shares, SARS exercised					(2)	(6)
Number Of Shares, Outstanding Ending Balance	42				42	39	35
Number Of Shares, Exercisable as of June 30, 2023	30				30
Number Of Shares, Unvested as of June 30, 2023	12				12
Share-based Compensation Arrangement by Share-based Payment Award, SARs, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Outstanding Beginning Balance		$ 159.39		$ 150.36	$ 159.39	$ 150.36
Weighted Average Exercise Price, SARs granted					142.88	155.16
Weighted Average Exercise Price, SARS exercised					93.87	94.44
Weighted Average Exercise Price, Outstanding Ending Balance	$ 160.83				160.83	$ 159.39	$ 150.36
Weighted Average Exercise Price, Exercisable as of June 30, 2023	168.30				168.30
Weighted Average Exercise Price, Unvested as of June 30, 2023	$ 142.46				$ 142.46
Average Remaining Contractual Term, Outstanding Beginning Balance					4 years 2 months 8 days	4 years 1 month 6 days	3 years 11 months 15 days
Average Remaining Contractual Term, Outstanding Ending Balance					4 years 2 months 8 days	4 years 1 month 6 days	3 years 11 months 15 days
Average Remaining Contractual Term, Exercisable as of June 30, 2023					3 years 6 months 25 days
Average Remaining Contractual Term, Unvested as of June 30, 2023					5 years 8 months 15 days
Aggregate Intrinsic Value, Outstanding Beginning Balance		$ 243		$ 1,643	$ 243	$ 1,643
Aggregate Intrinsic Value, Outstanding Ending Balance	$ 127				127	$ 243	$ 1,643
Aggregate Intrinsic Value, Exercisable as of June 30, 2023	84				84
Aggregate Intrinsic Value, Unvested as of June 30, 2023	$ 43				$ 43