Number of Share-based Compensation Plans

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Payout Factor, Percent

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Share Based Compensation Arrangement by Share Based Payment Award, Target Award

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Share Based Compensation Arrangement By Share Based Payment Award Target Payout

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Stock Option Exercisable Life

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Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable after one year (or the operating cycle, if longer).

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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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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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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 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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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Share-Based Compensation - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) share-based_compensation_plan shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Feb. 28, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans (in shares) \| share-based_compensation_plan	2
Number of shares authorized (in shares) \| shares	15,600,000
Number of shares available for future issuance (in shares) \| shares	3,000,000.0
Proceeds from stock option exercises	$ 44,587	$ 38,809	$ 27,639
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option exercisable life	10 years
Total intrinsic value of options exercised	$ 41,300	49,500	38,000
Proceeds from stock option exercises	44,600	38,800	27,600
Tax benefit realized for the tax deductions from stock options exercised	8,700	10,400	$ 8,000
Total unrecognized compensation cost	$ 9,100
Weighted-average period of total unrecognized compensation cost, in years	1 year 3 months 18 days
Stock Option \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Total unrecognized compensation cost	$ 5,800
Weighted-average period of total unrecognized compensation cost, in years	1 year
Unvested shares, granted (in shares) \| shares	39,065
Cash-settled Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Share based compensation, accrued expenses	$ 5,400	5,500
Share based compensation, other noncurrent liabilities	$ 2,900	$ 2,800
Unvested shares, granted (in shares) \| shares	20,780
Performance Shares Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 4,800
Weighted-average period of total unrecognized compensation cost, in years	10 months 24 days
Award requisite service period	3 years
Unvested shares, granted (in shares) \| shares	42,690	56,860	52,375
Payout factor, percent	201.00%
Performance Shares Units \| Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares) \| shares				48,223
Performance Shares Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award	0.00%
Performance Shares Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award	250.00%
Target payout	100.00%