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 Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Annual Vesting Percentage

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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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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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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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

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

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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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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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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 share-based compensation awards.

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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
	Nov. 29, 2018 USD ($)	May 15, 2018	Oct. 25, 2017 $ / shares	Oct. 24, 2017 $ / shares	Dec. 31, 2018 USD ($) director plan $ / shares shares	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Mar. 31, 2017 USD ($) $ / shares	Mar. 31, 2016	Dec. 31, 2018 USD ($) director plan $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 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					25,703,490				22,622,242					25,703,490	22,622,242
Common stock, shares outstanding (in shares) \| shares					7,625,339				6,523,370					7,625,339	6,523,370
Stock options awarded (in shares) \| shares														213,000	462,000	236,000
Number Of Directors \| director					3									3
Grants, weighted average exercise price (in usd per share) \| $ / shares														$ 25.43	$ 26.56	$ 20.06
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period \| shares														165,000	19,000	187,000
Unrecognized share based compensation cost					$ 2,300,000									$ 2,300,000
Unrecognized share based compensation, expected term (in years)														2 years
Shares purchased through Employee Stock Purchase Plan (in shares) \| shares														49,938	43,808	44,774
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share) \| $ / shares														$ 18.56	$ 22.43	$ 19.48
Share-Based Compensation Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance														50.00%
Dividends declared per share (in dollars per share) \| $ / shares			$ 0.075	$ 0.05	$ 0.075	$ 0.075	$ 0.075	$ 0.075						$ 0.30	$ 0.225	$ 0.15
Dividends declared, common stock, amount					$ 1,437,000	$ 1,436,000	$ 1,433,000	$ 1,207,000	$ 1,206,000	$ 835,000	$ 835,000	$ 833,000
Common Stock, Dividends, Per Share, Cash Paid \| $ / shares									$ 0.075	$ 0.05	$ 0.050	$ 0.050
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					$ 1,000,000									$ 1,000,000
Contractual term of all options granted														7 years
Stock options awarded (in shares) \| shares														212,940	461,700	235,500
Grants, weighted average exercise price (in usd per share) \| $ / shares														$ 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														$ 1,400,000	$ 3,300,000	$ 1,300,000
Total intrinsic value of options exercised														3,900,000	1,000,000	1,200,000
Total fair value of stock options vested														1,500,000	1,500,000	2,800,000
Share based compensation expense														1,000,000	1,500,000	1,700,000
Unrecognized share based compensation cost					$ 2,400,000									$ 2,400,000
Unrecognized share based compensation, expected term (in years)														3 years 3 months
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 Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of all options granted														5 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense														$ 246,000	244,000	234,000
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														$ 25.41
Share based compensation expense														$ 800,000	$ 700,000	$ 700,000
Cancellations (in shares) \| shares														(20,000)
Awards (in shares) \| shares														86,000
Awards ( in usd per share) \| $ / shares														$ 25.18
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														86,260	27,250	16,900
Awards granted, aggregate grant date market value														$ 2,200,000	$ 800,000	$ 300,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ 3,300,000
Awards (in shares) \| shares														113,320	105,540	73,700
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value														$ 2,900,000	$ 2,800,000	$ 1,600,000
Officers And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense														4,400,000	700,000	200,000
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	$ 400,000	$ 400,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) \| shares														7,403
Value of stock options granted														$ 151,928
Cancellations ( in usd per share) \| $ / shares														$ 20.52
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 Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage per period		50.00%
Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage per period		25.00%