Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Estimated Forfeiture Rate

No definition available.

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- Definition

The total fair value of options for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares in accordance with the terms of the arrangement.

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Stock Plan Offering Period

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

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Amount of paid and unpaid cash, stock, and paid-in-kind dividends declared for award under share-based payment arrangement.

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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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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

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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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- Definition

Discount rate from fair value on offering date that participants pay for shares.

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- Definition

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

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

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

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

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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

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

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No definition available.

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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

Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Description of terms of award under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Stock Options and Employee Stock Purchase Plan - Narrative (Details) - USD ($)			1 Months Ended	12 Months Ended
	May 07, 2020	May 01, 2018	May 31, 2001	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable (in shares)				175,601	163,741	298,577
Options exercisable (in usd per share)				$ 60.35	$ 45.94	$ 32.15
Number of options granted (in shares)				0	0	400,000
Weighted-average grant-date fair values of stock options granted (in usd per share)						$ 19.39
Total intrinsic values of options exercised in period				$ 3,000,000.0	$ 10,400,000	$ 3,800,000
Total fair value of options vested				1,000,000.0	1,000,000.0	100,000
Exercise of stock options				1,619,000	5,274,000	1,540,000
Tax benefit realized for the tax deductions from option exercises				700,000	2,400,000	900,000
Compensation expense recognized				$ 24,006,000	$ 23,922,000	$ 28,093,000
Estimated forfeiture rates				13.00%	13.90%	11.80%
Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Terms of award				10 years
Award vesting periods				5 years
Award vesting percentage				20.00%
Compensation expense recognized				$ 900,000	$ 900,000	$ 900,000
Unrecognized compensation cost related to non-vested awards granted				$ 5,800,000
Weighted-average period to recognize compensation cost (in years)				5 years
Restricted Stock and Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted units granted (in shares)				129,786	117,566	376,799
Modification incremental compensation cost	$ 0
Restricted Stock and Restricted Stock Unit \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods				1 year
Restricted Stock and Restricted Stock Unit \| Senior Staff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods				5 years
Restricted Stock and Restricted Stock Unit \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods				8 years
Market-based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period to recognize compensation cost (in years)				4 years 2 months 12 days
Restricted stock and restricted units granted (in shares)				82,112	74,051	473,501
Weighted-average grant-date fair values of restricted stock awards granted (in usd per share)				$ 70.99	$ 69.99	$ 52.95
Restricted Stock and Restricted Stock Unit, Market-based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit realized for the tax deductions from option exercises				$ 2,100,000	$ 2,400,000	$ 2,400,000
Compensation expense recognized				21,200,000	21,700,000	26,400,000
Unrecognized compensation cost related to non-vested awards granted				38,600,000
Total fair value of restricted stock and restricted stock units vested				18,600,000	12,700,000	9,700,000
Share-based compensation, dividends paid				$ 0	$ 100,000	$ 100,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period to recognize compensation cost (in years)				4 years 6 months
Restricted stock and restricted units granted (in shares)				210,630	3,844	20,044
2015 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)				4,200,000
Number of shares available for issuance (in shares)				2,019,350
2015 Stock Option Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market value of common stock on the date of grant for incentive stock options				100.00%
Employee Stock Purchase Plan \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)			2,000,000
Market value of common stock on the date of grant for incentive stock options		85.00%	95.00%
Offering period for incentive stock options		6 months	3 months
Number of shares available for issuance (in shares)				1,404,939
Compensation expense recognized				$ 2,000,000.0	$ 1,300,000	$ 700,000
Estimated forfeiture rates				11.15%	5.80%	1.96%
Maximum earnings withheld by the employees			15.00%
Issuance of shares under Employee Stock Purchase Plan (in shares)				118,629	66,413	33,262
Employee Stock Purchase Plan \| Minimum \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price under the Purchase Plan (in usd per share)				$ 61.51
Employee Stock Purchase Plan \| Maximum \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price under the Purchase Plan (in usd per share)				$ 62.82