Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Equity Incentive Plans (Summary Of Restricted Share Unit Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Shares, Outstanding at December 31, 2022			503,912
Number of Shares, Granted			352,090
Number of Shares, Vested			(228,102)
Number of Shares, Outstanding at March 31, 2023	614,091		614,091
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2022			$ 50.38
Weighted Average Grant Date Fair Value, Granted			42.23
Weighted Average Grant Date Fair Value, Vested			$ 54.10
Weighted Average Life Remaining, Outstanding at March 31, 2023 (in years)			1 year 4 months 24 days
Weighted Average Grant Date Fair Value, Outstanding at March 31, 2023	$ 44.44		$ 44.44
Unamortized share-based compensation expense	$ 14,300		$ 14,300
Severance Costs	$ 547	$ 0	$ 547	$ 0
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Shares, Outstanding at December 31, 2022			38,605
Number of Shares, Granted			43,497
Number of Shares, Vested			(40,054)
Number of Shares, Outstanding at March 31, 2023	42,048		42,048
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2022			$ 50.77
Weighted Average Grant Date Fair Value, Granted			41.67
Weighted Average Grant Date Fair Value, Vested			$ 50.44
Weighted Average Life Remaining, Outstanding at March 31, 2023 (in years)			11 months 1 day
Weighted Average Grant Date Fair Value, Outstanding at March 31, 2023	$ 41.67		$ 41.67
Unamortized share-based compensation expense	$ 1,600		$ 1,600
Restricted Share Units [Member] \| Non-Employee Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Share-based Payment Arrangement, Expense			1,000	1,200
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Share-based Payment Arrangement, Expense			$ 3,800	$ 3,900
Severance Costs	$ 300