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Number of common stock shares.

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The percentage of the Performance Unit Award earned at a certain point in time.

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Percentage of award distributed

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The period over which company performance metrics are earned for determination of performance-based award payouts.

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Share Based Compensation Arrangement By Share Based Payment Award Shares Available For Issuance Under Current Plan

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Share Based Compensation [Line Items]

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value

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- Definition

Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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

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

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Amount of noncash expense for 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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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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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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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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Gross number of share options (or share units) granted during the period.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-based Compensation Expense - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation [Line Items]
Common stock authorized for non-employee directors (in shares)	150,000,000	150,000,000
Stock-based compensation	$ 19,306,000	$ 21,284,000	$ 18,506,000
Stock-based compensation and other	22,837,000	19,680,000	15,228,000
Tax benefits recognized related to stock based compensation	$ 2,400,000	$ 3,200,000	$ 2,600,000
Stock options granted during the period (in shares)	76,221	95,639	63,259
Proceeds from stock option exercised	$ 40,437,000	$ 4,814,000	$ 3,633,000
Stock Incentive Plan Twenty Seventeen
Share Based Compensation [Line Items]
Shares available for grant (in shares)	3,754,334
Stock Incentive Plan Twenty Seventeen \| Maximum
Share Based Compensation [Line Items]
Number of shares available for issuance under incentive plan (in shares)	4,500,000
Non Employee Directors, Plan
Share Based Compensation [Line Items]
Common stock authorized for non-employee directors (in shares)	500,000
Shares available for grant (in shares)	345,405
Non Employee Directors, Plan \| Maximum
Share Based Compensation [Line Items]
Fair market value of shares issued per director per year	$ 150,000
Stock Options
Share Based Compensation [Line Items]
Share-based awards vesting period	3 years
Stock options, term	10 years
Intrinsic value of stock options exercised	$ 31,300,000	8,100,000	6,200,000
Compensation cost not yet recognized for nonvested share	$ 1,600,000
Remaining weighted average period for recognition of compensation cost years	1 year 9 months 18 days
Proceeds from stock option exercised	$ 40,400,000
Tax benefit from stock option exercised	7,100,000
Restricted Stock And Restricted Stock Units
Share Based Compensation [Line Items]
Compensation cost not yet recognized for nonvested share	$ 14,400,000
Remaining weighted average period for recognition of compensation cost years	2 years
Weighted average grant date fair value	$ 13,300,000	10,400,000	10,900,000
Weighted average fair value of awards vested in period	$ 9,000,000.0	7,500,000	4,900,000
Restricted Stock And Restricted Stock Units \| Minimum
Share Based Compensation [Line Items]
Share-based awards vesting period	1 year
Restricted Stock And Restricted Stock Units \| Maximum
Share Based Compensation [Line Items]
Share-based awards vesting period	5 years
Performance Unit Awards
Share Based Compensation [Line Items]
Compensation cost not yet recognized for nonvested share	$ 10,000,000.0
Remaining weighted average period for recognition of compensation cost years	1 year 6 months
Weighted average grant date fair value	$ 8,700,000	10,800,000	10,900,000
Weighted average fair value of awards vested in period	$ 3,000,000.0	$ 11,700,000	$ 20,000,000.0
Number of common stock share for each performance unit (in shares)	1
Performance Unit Awards \| Minimum
Share Based Compensation [Line Items]
Performance unit award payout percentage	0.00%
Specific performance criteria period	1 year
Performance Unit Awards \| Maximum
Share Based Compensation [Line Items]
Performance unit award payout percentage	200.00%
Specific performance criteria period	3 years
Two Year Measurement Period
Share Based Compensation [Line Items]
Percentage of award distributed	50.00%
One Year Vesting Period Thereafter
Share Based Compensation [Line Items]
Percentage of award distributed	50.00%