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The cash inflow associated with the amount received from the stock plan during the period.

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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 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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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Number of shares authorized for issuance under share-based payment arrangement.

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Number of options outstanding, including both vested and non-vested options.

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Stock Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) d $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under employee stock purchase plan \| $	$ 5,235	$ 4,232
Restricted Stock And Restricted Stock Unit (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	152,982	91,163
Restricted Stock And Restricted Stock Unit (RSU) \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods	1 year
Restricted Stock And Restricted Stock Unit (RSU) \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods	8 years
Market-based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	100,193	73,094
Trading days \| d	20
Trading days, lookback \| d	30
Weighted-average grant-date fair values of restricted stock awards granted (in usd per share) \| $ / shares	$ 87.11	$ 94.40
Weighted-average period to recognize compensation cost (in years)	3 years
Restricted Stock, Restricted Stock Unit (RSU), Market-based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested awards granted \| $	$ 48,200		$ 44,300
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	253,175
Weighted-average period to recognize compensation cost (in years)	3 years 8 months 12 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	2,000,000
Market value of common stock on the date of grant for incentive stock options	85.00%
Maximum earnings withheld by the employees	15.00%
Estimated forfeiture rate	11.15%	11.15%
Issuance of shares under employee stock purchase plan (in shares)	76,741	58,145
Number of shares available for issuance (in shares)	1,218,950
Minimum \| Restricted Stock And Restricted Stock Unit (RSU) \| Senior Staff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods	4 years
Maximum \| Restricted Stock And Restricted Stock Unit (RSU) \| Senior Staff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods	5 years
2007 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	4,500,000
Purchase price of common stock, percent	85.00%
Number of options outstanding (in shares)	0
Number of stocks outstanding (in shares)	0
2015 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	4,200,000
Number of options outstanding (in shares)	435,135
Number of stocks outstanding (in shares)	526,656
2015 Stock Option Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market value of common stock on the date of grant for incentive stock options	100.00%