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

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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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

Gross number of share options (or share units) granted during the period.

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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 award under share-based payment arrangement.

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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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Stock-Based Compensation - Additional Information (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2018 shares	Jun. 30, 2019 USD ($) plan	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) plan shares	Jun. 30, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of compensation plans \| plan		2		2
Granted (shares) \| shares				0
Total intrinsic value of stock options exercised		$ 200,000	$ 100,000	$ 300,000	$ 2,700,000
Fair value of stock options vested		1,600,000	100,000	4,300,000	3,100,000
Allocated share-based compensation expense		2,700,000	$ 1,800,000	5,300,000	$ 3,400,000
Unrecognized stock-based compensation expense		$ 15,100,000		$ 15,100,000
Weighted average, expected recognition period				2 years 2 months 12 days
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
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
2019 Awards \| Year One \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2019 Awards \| Year One \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2019 Awards \| Year Two \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2019 Awards \| Year Two \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2019 Awards \| Year Three \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2019 Awards \| Year Three \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2018 Awards \| Year One \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2018 Awards \| Year One \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2018 Awards \| Year Two \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2018 Awards \| Year Two \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2018 Awards \| Year Three \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2018 Awards \| Year Three \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting installment (as a percent)				33.33%
2014 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