Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

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 three months ended March 31, 2023:

	Stock Options Outstanding
				Weighted Average		Aggregate		Weighted Average
				Exercise Price		Intrinsic		Remaining Contractual
	Shares			Per Share		Value		Term (Years)
Balance as of January 1, 2023		1,577		$	288.30
Granted		0		$	0
Exercised		(44	)	$	151.51	$	5,259
Forfeited/Expired		(13	)	$	477.02
Balance as of March 31, 2023		1,520		$	290.79
Exercisable as of March 31, 2023		900		$	236.00	$	110,740		4.1
Expected to vest as of March 31, 2023		620		$	370.35	$	28,301		8.4
Total		1,520		$	290.79	$	139,041		5.9

Schedule of Range of Exercise Prices per Share

Stock options outstanding as of March 31, 2023 are comprised of the following range of exercise prices per share (in thousands, except per share data and years):

	Stock Options Outstanding at March 31, 2023
			Weighted Average		Weighted Average
			Exercise Price		Remaining Contractual
Range of Exercise Prices per Share	Shares		Per Share		Term (Years)
$121.43 - $200.00		873	$	137.87		3.9
$200.01 - $300.00		80	$	239.61		9.4
$400.01 - $500.00		317	$	408.73		8.8
$600.01 - $691.23		250	$	691.23		7.8
Total		1,520	$	290.79		5.9

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 $227.51 for each share subject to a stock option granted during the three months ended March 31, 2022 based on the following assumptions:

	Three months ended
	March 31,
	2022
Expected term of options in years	6.3
Expected volatility	58.4%
Risk-free interest rate	1.9%
Expected dividend yield	0.0%

Summary of Share-Settled Restricted Stock Unit Activity

As of March 31, 2023, there were 115,609 share-settled restricted stock units outstanding under the 2013 Equity Plan. 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
	Units			Intrinsic Value
Balance as of January 1, 2023		120
Granted		6
Vested		(6	)	$	1,598
Forfeited		(4	)
Balance as of March 31, 2023		116
Expected to vest as of March 31, 2023		116		$	33,795

Summary of Components of Tax (benefit) Expense Related To Equity Plan

The following table summarizes the tax (benefit) expense related to the Company’s equity plans (in thousands) for the three months ended March 31, 2023 and 2022:

	Three Months Ended
	March 31,
	2023			2022
Tax (benefit) expense related to:
Share-based compensation expense	$	(3,225	)	$	(2,897	)
Exercises of stock options and vesting of share-settled restricted stock units		(85	)		53
Total tax benefit related to the Company's equity plans	$	(3,310	)	$	(2,844	)