Stock Plans and Stock-Based Compensation - Stock Options - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 46,755,000	$ 33,489,000	$ 25,825,000
Intrinsic value of options exercised	30,600,000	48,200,000	25,700,000
Intrinsic value of all outstanding options	34,500,000	37,300,000	59,900,000
Total unrecognized compensation cost	1,400,000
Proceeds from stock option exercises	$ 8,160,000	17,411,000	$ 10,150,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting period	4 years
Stock options expiration period	10 years
Weighted-average grant-date fair value per share of options granted			$ 35.00
Stock-based compensation expense	$ 3,500,000	$ 5,700,000	$ 7,700,000
Stock options granted	0	0
Excess tax benefits realized from stock options exercised	$ 0	$ 0	$ 0
Weighted-average amortization period	10 months 24 days

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

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Amount of cost to be recognized for option under share-based payment arrangement.

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The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions.

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Amount of cash inflow from exercise of option 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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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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