Annual Cash Retainer

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- Definition

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

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- Definition

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

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- Definition

Number Of Directors

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- Definition

Number of Stock Benefit Plans

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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, Award Vesting Rights, Annual Vesting Percentage

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- Definition

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

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

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- Definition

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

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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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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Period

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

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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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Face amount or stated value per share of common stock.

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

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

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

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No definition available.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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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
	Dec. 02, 2019 shares	Nov. 04, 2019 shares	Aug. 01, 2019 shares	Feb. 20, 2019 shares	Nov. 29, 2018 USD ($)	May 15, 2018	Oct. 25, 2017 $ / shares	Oct. 24, 2017 $ / shares	Dec. 31, 2019 USD ($) director plan $ / shares shares	Sep. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Mar. 31, 2016	Dec. 31, 2019 USD ($) director plan $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	May 16, 2018 USD ($)
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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value																					$ 25,000
Common stock, shares issued (in shares) \| shares									25,880,362				25,703,490					25,880,362	25,703,490
Treasury Stock, Shares \| shares									8,025,339				7,625,339					8,025,339	7,625,339
Stock options awarded (in shares) \| shares																		100,000	213,000	462,000
Number Of Directors \| director									2									2
Grants, weighted average exercise price (in usd per share) \| $ / shares																		$ 24.35	$ 25.43	$ 26.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period \| shares																		298,000	165,000	19,000
Unrecognized share based compensation cost									$ 1,600,000									$ 1,600,000
Unrecognized share based compensation, expected term (in years)																		1 year 4 months 24 days
Shares purchased through Employee Stock Purchase Plan (in shares) \| shares																		73,731	49,938	43,808
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share) \| $ / shares																		$ 13.18	$ 18.56	$ 22.43
Dividends declared per share (in dollars per share) \| $ / shares							$ 0.075	$ 0.05	$ 0.075	$ 0.075	$ 0.075	$ 0.075						$ 0.300	$ 0.300	$ 0.225
Dividends declared, common stock, amount									$ 1,337,000	$ 1,336,000	$ 1,365,000	$ 1,360,000	$ 1,437,000	$ 1,436,000	$ 1,433,000	$ 1,207,000
Common Stock, Dividends, Per Share, Cash Paid \| $ / shares													$ 0.075	$ 0.075	$ 0.075	$ 0.075
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Period																		5 years
Number of Stock Benefit Plans \| plan									2									2
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									$ 2,900,000									$ 2,900,000
Contractual term of all options granted																		7 years
Stock options awarded (in shares) \| shares																		100,000	212,940	461,700
Grants, weighted average exercise price (in usd per share) \| $ / shares																		$ 24.35	$ 25.43	$ 26.56
Incremental award vesting percentage																	20.00%
Award vesting period (in years)																		5 years
Stock option, contracted term																		10 years
Value of stock options granted																		$ 600,000	$ 1,400,000	$ 3,300,000
Total intrinsic value of options exercised																		1,200,000	3,900,000	1,000,000
Total fair value of stock options vested																		900,000	1,500,000	1,500,000
Share based compensation expense																		700,000	1,000,000	1,500,000
Unrecognized share based compensation cost									$ 1,900,000									$ 1,900,000
Unrecognized share based compensation, expected term (in years)																		3 years 7 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]
Share based compensation expense																		$ 300,000	200,000	200,000
Purchase price percentage of grant date price per share (as a percent)																		85.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cancellations ( in usd per share) \| $ / shares																		$ 24.84
Share based compensation expense																		$ 800,000	$ 800,000	$ 700,000
Cancellations (in shares) \| shares																		(12,000)
Awards (in shares) \| shares																		26,000
Awards ( in usd per share) \| $ / shares																		$ 19.94
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)																		3 years
Awards (in shares) \| shares																		25,550	86,260	27,250
Awards granted, aggregate grant date market value																		$ 500,000	$ 2,200,000	$ 800,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense					$ 3,300,000
Awards (in shares) \| shares	35,000	9,123	14,000	248,500														306,623	113,320	105,540
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value																		$ 1,600,000	$ 2,900,000	$ 2,800,000
Officers And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense																		200,000	4,400,000	700,000
Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director compensation, annual cash retainer																		75,000
Director Compensation, Quarterly Installment Of Annual Cash Retainer																		18,750
Directors compensation expense																		$ 500,000	$ 500,000	$ 400,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) \| shares																		7,458
Value of stock options granted																		$ 200,000
Cancellations ( in usd per share) \| $ / shares																		$ 20.78
Director compensation, annual cash retainer																		$ 10,000
Director Compensation, Quarterly Installment Of Annual Cash Retainer																		2,500
Corporate Governance Committee Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director compensation, annual cash retainer																		5,000
Director Compensation, Quarterly Installment Of Annual Cash Retainer																		1,250
New Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director Compensation, Quarterly Installment Of Annual Cash Retainer																		$ 25,000
Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage per period						50.00%
Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage per period						25.00%