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Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity (in thousands, except per share data and years) for the periods indicated:

		Stock Options Outstanding
						Weighted Average				Aggregate				Weighted Average
						Exercise Price				Intrinsic				Remaining Contractual
		Shares				Per Share				Value				Term (Years)
Balance as of January 1, 2019			1,480			$	137.16
Granted			470				150.88
Exercised			(51	)			128.17			$	799
Forfeited/Expired			(265	)			135.88
Balance as of December 31, 2019			1,634				141.60
Granted			118				146.76
Exercised			(348	)			146.80			$	29,994
Forfeited/Expired			(247	)			146.63
Balance as of December 31, 2020			1,157				139.48
Granted			305				676.10
Exercised			(269	)			151.19			$	163,427
Forfeited/Expired			(26	)			499.11
Balance as of December 31, 2021			1,167			$	268.74
Exercisable as of December 31, 2021			576			$	131.39			$	237,948			3.5
Expected to vest as of December 31, 2021			591			$	402.66				122,964			8.4
Total			1,167			$	268.74			$	360,912			6.0

Schedule of Range of Exercise Prices per Share

Stock options outstanding as of December 31, 2021 are comprised of the following range of exercise prices per share (in thousands, except per share data and years):

		Stock Options Outstanding at December 31, 2021
						Weighted Average				Weighted Average
						Exercise Price				Remaining Contractual
Range of Exercise Prices per Share		Shares				Per Share				Term (Years)
$121.43 - $200.00			880			$	135.94				4.9
$400.01 - $500.00			20			$	470.00				9.4
$600.01 - $691.23			267			$	691.23				9.1
Total			1,167			$	268.74				6.0

Assumptions Used in Black-Scholes Pricing Model

The weighted average grant date fair value of stock option awards using the Black-Scholes valuation model was $372.05, $49.68, and $54.36 for each share subject to a stock option granted during the years ended December 31, 2021, 2020, and 2019, respectively, based on the following assumptions:

		Years Ended December 31,
		2021		2020		2019
Expected term of options in years		6.3		6.3		6.3
Expected volatility		56.8% - 59.0%		33.6% - 34.6%		33.2% - 33.4%
Risk-free interest rate		0.8% - 1.1%		0.3% - 0.5%		1.7% - 2.5%
Expected dividend yield		0.0%		0.0%		0.0%

Summary of Share-Settled Restricted Stock Unit Activity

The following table summarizes the Company’s share-settled restricted stock unit activity (in thousands) for the periods indicated:

		Share-Settled Restricted Stock Units Outstanding
						Aggregate
						Intrinsic
		Units				Value
Balance as of January 1, 2020			0
Granted			76
Vested			0			$	0
Forfeited			(2	)
Balance as of December 31, 2020			74
Granted			58
Vested			(17	)		$	13,803
Forfeited			(10	)
Balance as of December 31, 2021			105
Expected to vest as of December 31, 2021			105			$	57,234

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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