Stock-Based Compensation

3 Months Ended

Mar. 31, 2022

Stock-Based Compensation [Abstract]

Stock-Based Compensation

12.STOCK-BASED COMPENSATION

Stock Options

The Company records compensation expense for employee stock options based on the estimated fair value of the options on the date of grant using the Black-Scholes option-pricing model with the assumptions included in the table below. The Company uses a combination of historical data and historical volatility to establish the expected volatility, as well as to estimate the expected option life. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for the estimated life of the option. The following assumptions were used to estimate the fair value of options granted using the Black-Scholes option-pricing model:

	For the three
	months ended
	March 31, 2022
Risk free interest rate	2.53%
Dividend yield	0.9%
Expected volatility	27%
Expected lives	4.3 years

There were no options granted during the three months ended March 31, 2021.

The following table summarizes the Company’s activities with respect to its stock option plans for the three months ended March 31, 2022 as follows (dollars and shares in thousands, except for per share data):

		Weighted-		Weighted-Average
		Average		Remaining
	Number	Exercise Price		Contractual	Aggregate
	of Shares	Per Share		Life (in years)	Intrinsic Value
Outstanding at December 31, 2021	1,899	$	157.76
Granted	10	$	328.99
Exercised	(59)	$	143.16
Forfeited/canceled	(1)	$	174.28
Outstanding at March 31, 2022	1,849	$	159.13	3.1	$	341,859
Exercisable at March 31, 2022	1,572	$	153.68	3.0	$	299,265
Unvested at March 31, 2022	277	$	190.14	4.2	$	42,594

The weighted-average per share fair value of options granted during the three months ended March 31, 2022 was $82.28. The total intrinsic value for options exercised during the three months ended March 31, 2022 was $11.0 million.

Restricted Stock Units and Performance-Based Restricted Stock Units

The following table summarizes the Company’s RSU and PSU activity for the three months ended March 31, 2022:

	RSUs			PSUs (1)
		Weighted-Average			Weighted-Average
	Number of	Grant Date Fair		Number of	Grant Date Fair
	Shares	Value per Share		Shares	Value per Share
	(in thousands)			(in thousands)
Outstanding at December 31, 2021	243	$	230.20	298	$	304.46
Granted	93	$	330.78	139	$	391.19
Vested	(110)	$	217.29	—	$	—
Forfeited/canceled	(2)	$	254.31	(1)	$	290.89
Outstanding at March 31, 2022	224	$	278.16	436	$	332.18

(1)PSUs represent the target number of shares granted that are issuable at the end of the three year performance period. Fair value for a portion of the PSUs was calculated using a Monte Carlo simulation model.