Stock-Based Compensation (Summary of Restricted Stock Unit Activity) (Details) - USD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 21,021,000	$ 19,126,000	$ 17,778,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding, beginning, number of shares	369,592	425,275	405,104
Granted, number of shares	247,860	176,804	216,318
Vested, number of shares	(141,674)	(164,088)	(160,229)
Forfeited, number of shares	(64,925)	(68,399)	(35,918)
Restricted stock units outstanding, ending, number of shares	410,853	369,592	425,275
Restricted stock units outstanding, beginning, weighted average grate date fair value per share	$ 88.88	$ 80.37	$ 76.45
Granted, weighted average grant date fair value per share	85.27	96.07	78.90
Vested, weighted average grant date fair value	87.64	75.61	68.72
Restricted stock units outstanding, ending, weighted average grate date fair value per share	$ 87.07	$ 88.88	$ 80.37
Stock-based compensation expense	$ 13,200,000	$ 12,200,000	$ 10,800,000
Unrecognized costs related to share based compensation	$ 21,700,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months 26 days
Grant date fair value of vested units	$ 12,400,000	$ 12,400,000	$ 11,000,000
Company withheld shares	47,130	56,792	54,543
Company withheld shares, tax obligations	$ 4,200,000	$ 5,800,000	$ 4,500,000
Forfeited, weighted average grant date fair value	$ 89.29	$ 86.38	$ 79.36

Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

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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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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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