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Percentage Of Director Compensation Paid In Restricted Stock Awards

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

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Unearned Performance Based Options in Period

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The term for value of shares to be granted upon election.

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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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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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- Definition

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

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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- 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

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

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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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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Number of options vested.

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Stock Compensation Plans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) plan $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares	May 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of compensation plans \| plan	2
Total intrinsic value of stock options exercised \| $	$ 1,200,000	$ 1,700,000	$ 1,700,000
Fair value of stock options vested \| $	4,100,000	3,800,000	3,900,000
Allocated share-based compensation expense \| $	6,500,000	$ 5,400,000	$ 4,300,000
Unrecognized stock-based compensation expense \| $	$ 9,400,000
Weighted average, expected recognition period	1 year 10 months 24 days
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	1,156,763	1,090,160
Number of stock options unvested (in shares)	20,388
Employee Stock Option \| Black-Scholes Option Valuation Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option weighted average grant date fair value (in dollars per share) \| $ / shares	$ 14.51	$ 12.90	$ 15.08
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Number of restricted stock units vested (in shares)	21,706
Number of restricted stock units unvested (in shares)	604
Number of performance based shares granted (in shares)	155,975
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units vested (in shares)		300
Number of restricted stock units unvested (in shares)		604
Performance Based Restricted Stock Units \| Share-based Compensation Award, Tranche One \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Performance Based Restricted Stock Units \| Share-based Compensation Award, Tranche Two \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Performance Based Restricted Stock Units \| Share-based Compensation Award, Tranche Three \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Performance Based Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options vested (in shares)		8,590
Number of stock options unvested (in shares)		20,388
Performance Based Employee Stock Options \| Share-based Compensation Award, Tranche One \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Performance Based Employee Stock Options \| Share-based Compensation Award, Tranche Two \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Performance Based Employee Stock Options \| Share-based Compensation Award, Tranche Three \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Number of performance based shares granted (in shares)	0	0
Prior to Fiscal Year 2016 \| Employee Stock Option \| Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Prior to Fiscal Year 2016 \| Employee Stock Option \| Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Prior to Fiscal Year 2016 \| Employee Stock Option \| Share-based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Prior to Fiscal Year 2016 \| Restricted Stock Units (RSUs) \| Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Prior to Fiscal Year 2016 \| Restricted Stock Units (RSUs) \| Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Prior to Fiscal Year 2016 \| Restricted Stock Units (RSUs) \| Share-based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Fiscal Year 2017 \| Employee Stock Option \| Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Fiscal Year 2017 \| Employee Stock Option \| Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
Fiscal Year 2017 \| Employee Stock Option \| Share-based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment percentage	33.33%
2004 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	0
2009 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for grant awards	1,781,546
Options outstanding	390,351
Exercise price, lower range \| $ / shares	$ 35.90
Exercise price, upper range \| $ / shares	$ 57.54
Expiration period, years	10 years
2009 Plan \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
2009 Plan \| 2010 Change In Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period, years	7 years
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for grant awards				1,974,543
Options outstanding	766,912
Exercise price, lower range \| $ / shares	$ 29.98
Exercise price, upper range \| $ / shares	$ 59.97
Expiration period, years	7 years
2014 Plan \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Director's Plan, Per Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted based on percent of director compensation	50.00%
Director's Plan, Per Director \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Value of shares granted upon election \| $	$ 100,000