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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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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 vested during the reporting period.

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

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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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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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Percentage of vesting of share-based compensation awards.

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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-Based Compensation - Additional Information (Details)	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2018 shares	Mar. 31, 2018 shares	Jun. 30, 2018 USD ($) plan	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) plan $ / shares shares	Jun. 30, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of compensation plans \| plan			2		2
Fair value of stock options vested \| $					$ 3,100,000	$ 2,900,000
Allocated share-based compensation expense \| $			$ 1,800,000	$ 1,800,000	3,400,000	3,200,000
Unrecognized stock-based compensation expense \| $			14,800,000		$ 14,800,000
Weighted average, expected recognition period					2 years 2 months
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)					18,618
Number of restricted stock units unvested (in shares)					640
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options unvested (in shares)					17,160
Total intrinsic value of stock options exercised \| $					$ 2,700,000	$ 100,000
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					$ 23.43	$ 14.51
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)					3 years
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units vested (in shares)		266
Number of restricted stock units unvested (in shares)		640
Performance Based Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options vested (in shares)		7,743
Number of stock options unvested (in shares)		17,160
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)	1,000,000
Shares authorized (in shares)	2,974,543
2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in 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 \| 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
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock options vested \| $				100,000
Maximum \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options exercised \| $			$ 100,000	$ 100,000