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- Definition

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

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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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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

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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- 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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No definition available.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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- Definition

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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- 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

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

Percentage of vesting of share-based compensation awards.

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- Definition

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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Stock-Based Compensation - Additional Information (Details)	1 Months Ended	3 Months Ended
	May 31, 2018 shares	Mar. 31, 2019 USD ($) plan $ / shares shares	Mar. 31, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of compensation plans \| plan		2
Fair value of stock options vested		$ 2,700,000	$ 3,100,000
Allocated share-based compensation expense		2,600,000	1,600,000
Unrecognized stock-based compensation expense		$ 15,900,000
Weighted average, expected recognition period		2 years 1 month 6 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		3 years
Number of restricted stock units vested (in shares) \| shares		82,930
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options exercised		$ 100,000	$ 2,700,000
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		$ 62.74	$ 23.43
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		3 years
March 2018 \| Year One \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2018 \| Year One \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2018 \| Year Two \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2018 \| Year Two \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2018 \| Year Three \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2018 \| Year Three \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2017 \| Year One \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2017 \| Year One \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2017 \| Year Two \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2017 \| Year Two \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2017 \| Year Three \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
March 2017 \| Year Three \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
2015 \| Year One \| Performance Based Restricted Stock Units \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
2015 \| Year One \| Performance Based Employee Stock Options \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
2015 \| Year Two \| Performance Based Restricted Stock Units \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
2015 \| Year Two \| Performance Based Employee Stock Options \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
2015 \| Year Three \| Performance Based Restricted Stock Units \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
2015 \| Year Three \| Performance Based Employee Stock Options \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)		33.33%
Two Thousand Fourteen Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares) \| shares	1,000,000
Shares authorized (in shares) \| shares	2,974,543
2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares) \| shares	891,960
Directors Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term for value of shares to be granted upon election		$ 100,000
Directors Plan \| Restricted Stock \| Independent Chairman of the Board
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term for value of shares to be granted upon election		50,000
Directors Plan \| Restricted Stock \| Lead Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term for value of shares to be granted upon election		$ 40,000