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Stock Plans (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock options activity

		Number of Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (years)		Aggregate Intrinsic Value (thousands)
Balance at December 31, 2020 (1,497,567 shares exercisable)		4,091,293			$	94.88
Granted		532,979			$	116.55
Exercised		(296,363	)		$	26.41
Forfeited/Canceled		(17,831	)		$	119.80
Expired		(877	)		$	16.39
Balance at December 31, 2021		4,309,201			$	102.19			7.2		$	97,425
Exercisable at December 31, 2021		1,466,983			$	78.19			4.5		$	65,770
Vested and expected to vest at December 31, 2021		1,963,940			$	90.29			5.5		$	68,162

Schedule of the fair value using the Black-Scholes-Merton option-pricing model

		Year ended December 31,
		2021				2020				2019
Volatility		39.3		%		35.6		%		29.3		%
Risk-free interest rate - weighted average		1.2		%		0.6		%		2.1		%
Risk-free interest rate - range		0.5% to 1.21		%		0.31% to 1.17		%		(a)
Dividend yield		—		%		—		%		—		%
Assumed forfeitures		8.0		%		8.0		%		8.0		%
Expected lives		4.6 years				7.1 years				5.2 years
Weighted-average fair value (per share)		$	39.99			$	48.21			$	43.96

(a) At the date of grant, the risk fee rate for stock options awarded in 2019 was 1.7%.

Schedule of restricted stock activity

		Number of Shares			Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2020		485,510			$	126.62
Granted		191,184			$	117.35
Vested		(107,700	)		$	115.85
Forfeited		(33,890	)		$	98.18
Nonvested at December 31, 2021		535,104			$	127.96

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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