Director Compensation, Annual Cash Retainer

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Director Compensation, Quarterly Installment of Annual Cash Retainer

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

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

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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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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 Instrument Other Than Options, Percent Represented By EBITDA

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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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No definition available.

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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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- Definition

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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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 the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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No definition available.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Stockholders' Equity Stockholders' Equity (Narrative) (Details) - USD ($)		3 Months Ended									9 Months Ended	12 Months Ended
	May 17, 2016	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)		80,000,000				80,000,000						80,000,000	80,000,000
Common stock, par value (in dollars per share)		$ 0.01				$ 0.01						$ 0.01	$ 0.01
Common stock, shares issued (in shares)		22,622,242				22,490,855						22,622,242	22,490,855
Common stock, shares outstanding (in shares)		22,622,242				22,490,855						22,622,242	22,490,855
Treasury stock, shares (in shares)		6,523,370				5,849,316						6,523,370	5,849,316
Stock options awarded (in shares)												462,000	236,000	653,000
Grants, weighted average exercise price (in usd per share)												$ 26.56	$ 20.06	$ 22.66
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period												19,000	187,000	229,000
Shares purchased through Employee Stock Purchase Plan (in shares)												43,808	44,774	44,074
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share)												$ 22.43	$ 19.48	$ 17.17
Share-Based Compensation Arrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By EBITDA					50.00%				25.00%
Share-Based Compensation Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance					50.00%				75.00%
Dividends declared per share (in dollars per share)		$ 0.075	$ 0.05	$ 0.050	$ 0.050							0.225	0.15	$ 0.10
Dividends declared, common stock, amount		$ 1,206,000	$ 835,000	$ 835,000	$ 833,000	$ 830,000	$ 831,000	$ 415,000	$ 415,000
Common Stock, Dividends, Per Share, Cash Paid						$ 0.050	$ 0.050	$ 0.025	$ 0.025			$ 0.075	$ 0.05
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of all options granted												7 years
Stock options awarded (in shares)												461,700	235,500	628,000
Grants, weighted average exercise price (in usd per share)												$ 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												$ 3,300,000	$ 1,300,000	$ 3,700,000
Intrinsic value of outstanding stock options		9,800,000										9,800,000
Intrinsic value of exercisable stock options		8,600,000										8,600,000
Total intrinsic value of options exercised												1,000,000	1,200,000	1,100,000
Total fair value of stock options vested												1,500,000	2,800,000	1,800,000
Share based compensation expense												1,500,000	1,700,000	2,400,000
Unrecognized share based compensation cost		3,000,000										$ 3,000,000
Unrecognized share based compensation, expected term (in years)												4 years
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												$ 244,000	234,000	197,000
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]
Share based compensation expense												$ 700,000	$ 700,000	$ 1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period												6,000
Unrecognized share based compensation cost		$ 1,300,000										$ 1,300,000
Unrecognized share based compensation, expected term (in years)												1 year 4 months 24 days
Awards (in shares)												27,000
Awards ( in usd per share)												$ 27.53
Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)												4 years
Vesting percentage per period												33.33%
Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)												3 years
Vesting percentage per period												25.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards (in shares)										27,250			16,900	37,900
Awards granted, aggregate grant date market value												$ 800,000	$ 300,000	$ 900,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards (in shares)									73,700			105,540
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value									$ 1,600,000			$ 2,800,000
Awards ( in usd per share)												$ 26.56
Officers And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense												$ 700,000	200,000
Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense												$ 400,000	$ 400,000	$ 700,000
Audit Committee Chairman
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director compensation, annual cash retainer	$ 10,000
Director Compensation, Quarterly Installment Of Annual Cash Retainer	2,500
Director
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
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, annual cash retainer	$ 25,000
Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental award vesting percentage											50.00%
Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental award vesting percentage											25.00%