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Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

Share-Based Payment Arrangement [Abstract]

Market-Based Restricted Stock Awards, Valuation Assumptions

The weighted-average fair values of market-based restricted stock awards granted have been estimated utilizing the following assumptions:

			June 30, 2022						June 30, 2021
Underlying stock price at valuation date			$	99.32					$	113.27
Expected volatility			36.7		%				30.3		%
Risk-free interest rate			1.8		%				1.3		%

Restricted Stock and Restricted Stock Unit Award Activity

Restricted stock award activity for the six months ended June 30, 2022 is set forth below:

			Shares						Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2022			383,963						$	62.65
Granted			—						—
Vested			(61,073)						80.67
Canceled			(1,605)						93.75
Nonvested at June 30, 2022			321,285						$	60.36

Restricted stock unit activity for the six months ended June 30, 2022 is set forth below:

			Number of Shares						Weighted-Average Remaining Contractual Term (in years)						Aggregate Intrinsic Value
Outstanding at January 1, 2022			360,743
Granted			232,310
Vested			(73,433)
Canceled			(12,658)
Outstanding at a June 30, 2022			506,962						2.9						$	37,783,878
Vested and expected to vest at June 30, 2022			506,962						2.9						$	37,783,878

Employee Stock Purchase Plan, Valuation Assumptions

The compensation expense related to the Purchase Plan has been estimated utilizing the following assumptions:

			June 30, 2022						June 30, 2021
Risk-free interest rate			1.54		%				0.02		%
Expected term (in years)			0.5						0.5
Dividend yield			0.00		%				0.00		%
Expected volatility			41.6		%				29.5		%
Weighted average volatility			41.6		%				29.5		%

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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

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