Number of Compensation Plans

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- Definition

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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- Definition

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

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- Definition

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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- Definition

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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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 share-based payment arrangement.

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No definition available.

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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

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

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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, 2020 USD ($) plan $ / shares shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2019 $ / shares 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		$ 1,000,000.0	$ 100,000
Fair value of stock options vested		800,000	2,700,000
Allocated share-based compensation expense		$ 1,905,000	$ 2,331,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value (USD per share) \| $ / shares		$ 59.44		$ 49.53
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Weighted average fair value (USD per share) \| $ / shares		$ 80.38	$ 62.74
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares) \| shares		419,762		486,682
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense		$ 2,200,000	$ 2,600,000
Unrecognized stock-based compensation expense		$ 20,200,000
Weighted average, expected recognition period		2 years 6 months
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
Shares outstanding (in shares) \| shares		0
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