Common Stock, Dividends, Per Share, Declared, Increase Authorized

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- Definition

Pre tax compensation expense related to director fees, annual retainers, and deferred compensation amortization.

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No definition available.

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- Definition

Weighted average purchase price of capital shares purchased through an employee stock purchase plan.

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No definition available.

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- Definition

Number of Stock Benefit Plans

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No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Additional Installment of Annual Cash Retainer

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No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Admission Grant

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Consecutive Days

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Contractual Term of Award

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value

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No definition available.

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Fair Value

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No definition available.

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value

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No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures Fair Value

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Returned for Payroll Taxes

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No definition available.

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- Definition

Quarterly Installment of Annual Cash Retainer

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Quarterly Retainer

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value

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No definition available.

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- Definition

Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

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

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No definition available.

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- Definition

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

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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- Definition

Face amount or stated value per share of common stock.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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- Definition

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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- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

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- Definition

Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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No definition available.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

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

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- Definition

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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- Definition

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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- Definition

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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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

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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No definition available.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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- Definition

The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

The increase or decrease in number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding, including vested options.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Price of a single share of a number of saleable stocks of a company.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of options vested.

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Purchase price of common stock expressed as a percentage of its fair value.

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- Definition

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

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Stockholders' Equity Stockholders' Equity (Narrative) (Details)									3 Months Ended												12 Months Ended
	Nov. 29, 2021 $ / shares	Oct. 27, 2021 $ / shares	Sep. 15, 2021 $ / shares	Aug. 12, 2021 $ / shares	Jun. 01, 2021 USD ($) $ / shares	Apr. 16, 2021 $ / shares	May 19, 2020 shares	Feb. 19, 2020 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) plan $ / shares shares	Sep. 30, 2021 USD ($) $ / shares	Jun. 30, 2021 USD ($) $ / shares	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares	Jun. 30, 2020 USD ($) $ / shares	Mar. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 $ / shares	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2024 shares	Dec. 31, 2021 USD ($) plan $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares) \| shares									80,000,000				80,000,000									80,000,000	80,000,000
Common stock, par value (in dollars per share) \| $ / shares									$ 0.01				$ 0.01									$ 0.01	$ 0.01
Common stock, shares issued (in shares) \| shares									26,264,245				26,020,494									26,264,245	26,020,494
Treasury Stock, Shares \| shares									10,932,322				8,025,339									10,932,322	8,025,339
Stock options awarded (in shares) \| shares																						851,000	20,000	100,000
Grants, weighted average exercise price (in usd per share) \| $ / shares																						$ 34.79	$ 18.02	$ 24.35
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period \| shares																						75,000	146,000	298,000
Unrecognized share based compensation cost									$ 616,000													$ 616,000
Unrecognized share based compensation, expected term (in years)																						1 year 2 months 12 days
Issuance of common stock from employee stock purchase plan (in shares) \| shares																						61,904	71,908	73,731
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share) \| $ / shares																						$ 26.32	$ 16.71	$ 13.18
Dividends declared per share (in dollars per share) \| $ / shares		$ 0.45							$ 0.1125	$ 0.1000	$ 0.1000	$ 0.1000										$ 0.4125	$ 0.3375	$ 0.3000
Dividends declared, common stock, amount									$ 1,873,000	$ 1,783,000	$ 1,808,000	$ 1,799,000	$ 1,797,000	$ 1,569,000	$ 1,343,000	$ 1,339,000
Common Stock, Dividends, Per Share, Cash Paid \| $ / shares													$ 0.1000	$ 0.0875	$ 0.0750	$ 0.0750
Number of Stock Benefit Plans \| plan									2													2
Common Stock, Dividends, Per Share, Declared, Increase Authorized \| $ / shares		$ 0.05
Exercise of stock options, shares \| shares																						423,294	40,365	247,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease) \| shares																						211,088	18,640
Share-based Compensation Arrangement by Share-based Payment Award, Options, Returned for Payroll Taxes \| shares																						43,534	2,954
Exercisable at end of year (in usd per share) \| $ / shares									$ 25.71				$ 22.90				$ 22.02					$ 25.71	$ 22.90	$ 22.02
Exercised (in usd per share) \| $ / shares																						$ 21.99	$ 13.72	$ 17.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares \| shares																						12,980
Salaries and wages									$ 2,193,000				$ 1,392,000									$ 2,193,000	$ 1,392,000
Share-based Payment Arrangement, Accelerated Cost																						$ 129,000
Common stock outstanding (in shares) \| shares									15,331,923				17,995,155									15,331,923	17,995,155
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares																						$ 18.02	$ 34.79
Good to Great Incentive Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) \| shares								17,991																14,844
Total intrinsic value of options exercised								$ 449,000																$ 294,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value \| $ / shares								$ 25.00																$ 19.92
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value									$ 16,500,000													$ 16,500,000
Contractual term of all options granted																						7 years
Stock options awarded (in shares) \| shares																						701,400	20,000	100,000
Total intrinsic value of options exercised																						$ 8,229,000	$ 517,000	$ 1,197,000
Total fair value of stock options vested																						1,413,000	735,000	853,000
Unrecognized share based compensation cost									$ 6,100,000													$ 6,100,000
Unrecognized share based compensation, expected term (in years)																						4 years 9 months 14 days
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation																						$ 2,272,000	89,000
Proceeds from Stock Options Exercised																						1,013,000	19,000
Share based compensation expense																						$ 2,355,000	$ 669,000	$ 682,000
Dividend yield																						1.15%	1.67%	1.23%
Expected volatility																						36.72%	38.54%	27.45%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate																						0.57%	0.25%	1.65%
Employee Stock Option \| Black-Scholes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) \| shares																						701,400	20,000
Value of stock options granted																						$ 7,115,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value																							$ 92,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period \| shares																						74,688	146,034
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures Fair Valueriod																						$ 722,000	$ 846,000
Employee Stock Option \| Monte-Carlo Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) \| shares																						150,000
Grants, weighted average exercise price (in usd per share) \| $ / shares																						$ 34.79
Award vesting period (in years)																						10 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value																						$ 1,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Consecutive Days																						3 days
Employee Stock Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of all options granted																						10 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price percentage of grant date price per share (as a percent)																						85.00%
Share based compensation expense																						$ 552,000	$ 434,000	$ 292,000
Dividend yield																						0.01%	1.50%	1.40%
Expected volatility																						48.10%	48.60%	36.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate									10.00%	10.00%	9.00%	9.00%	156.00%	157.00%	157.00%	154.00%	260.00%	256.00%	251.00%	242.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cancellations ( in usd per share) \| $ / shares																						$ 28.18
Cancellations (in shares) \| shares																						(966)
Awards (in shares) \| shares																						9,300
Awards ( in usd per share) \| $ / shares																						$ 34.79
Share based compensation expense																						$ 390,000	$ 735,000	$ 828,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards (in shares) \| shares																						9,300	10,200
Awards granted, aggregate grant date market value																						$ 324,000	$ 255,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation \| shares																						10,399	10,588
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation																						$ 375,000	$ 250,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Fair Value																						$ 27,000	$ 0
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited \| shares																						966	0
Awards ( in usd per share) \| $ / shares																						$ 34.79	$ 25.00
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, weighted average exercise price (in usd per share) \| $ / shares	$ 51.15		$ 45.27	$ 39.48	$ 38.78	$ 35.83
Cancellations ( in usd per share) \| $ / shares																						$ 14.29
Cancellations (in shares) \| shares																						(55,896)	(33,538)
Unrecognized share based compensation cost									$ 7,200,000													$ 7,200,000
Unrecognized share based compensation, expected term (in years)																						36 months
Awards (in shares) \| shares																						55,302	30,743
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value																						$ 2,116,000	$ 733,000
Share-based Payment Arrangement, Plan Modification, Incremental Cost					$ 2,600,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Fair Value																						$ 799,000	631,000
Awards ( in usd per share) \| $ / shares																						$ 38.27
Expected volatility	45.50%		43.44%	42.85%	41.79%	41.17%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.85%		0.49%	0.53%	0.46%	0.52%
Performance Shares \| Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards (in shares) \| shares																					1,052,532
Officers And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense																						$ 1,573,000,000	894,000,000	196,000,000
Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense																						$ 858,000	$ 889,000	$ 455,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) \| shares																						14,744	30,883	7,458
Value of stock options granted																						$ 622,000	$ 654,000	$ 155,000
Cancellations ( in usd per share) \| $ / shares																						$ 42.14	$ 21.16	$ 20.78
Director Compensation, Quarterly Installment Of Annual Cash Retainer								$ 35,000
Share Based Compensation Arrangement By Share Based Payment Award, Admission Grant								25,000
Share Based Compensation Arrangement By Share Based Payment Award, Quarterly Retainer								18,750
Advsior
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) \| shares																						466	967	0
Value of stock options granted																						$ 20,000	$ 20,000	$ 0
Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards (in shares) \| shares							368,921																237,500
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value																							$ 2,800,000
Share-based Payment Arrangement, Plan Modification, Incremental Cost																							$ 1,700,000
Lead Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director Compensation, Quarterly Installment Of Annual Cash Retainer								2,500
Share Based Compensation Arrangement By Share Based Payment Award, Additional Installment of Annual Cash Retainer								10,000
Chairman of Audit Committee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director Compensation, Quarterly Installment Of Annual Cash Retainer								2,500
Share Based Compensation Arrangement By Share Based Payment Award, Additional Installment of Annual Cash Retainer								10,000
Chairman of Corporate Governance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director Compensation, Quarterly Installment Of Annual Cash Retainer								1,250
Share Based Compensation Arrangement By Share Based Payment Award, Additional Installment of Annual Cash Retainer								5,000
Chairman of Compensation Commitee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director Compensation, Quarterly Installment Of Annual Cash Retainer								1,250
Share Based Compensation Arrangement By Share Based Payment Award, Additional Installment of Annual Cash Retainer								$ 5,000
Share-based Payment Arrangement, Tranche One [Member] \| Employee Stock Option \| Monte-Carlo Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in dollars per share) \| $ / shares									$ 53.39													$ 53.39
Share based compensation expense																						$ 511,000
Salaries and wages									$ 50,000													$ 50,000
Share-based Compensation Arrangement by Share-based Payment Award, Consecutive Days																						3 days
Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate																						1.29%
Share-based Payment Arrangement, Tranche Two [Member] \| Employee Stock Option \| Monte-Carlo Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) \| shares																						100,000
Share price (in dollars per share) \| $ / shares									$ 77.34													$ 77.34
Dividend yield																						1.15%
Expected volatility																						34.08%