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Stock Options and Employee Stock Purchase Plan (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Stock Option Activity

The following table represents stock option activity for the six months ended June 30, 2021:

			Number of Shares						Weighted- Average Exercise Price						Weighted-Average Remaining Contractual Term (in years)						Aggregate Intrinsic Value
Outstanding at January 1, 2021			475,601						$	69.61
Granted			—						—
Exercised			(45,351)						29.34
Canceled			—						—
Outstanding at June 30, 2021			430,250						$	73.85					6.3						$	27,405,745
Exercisable at June 30, 2021			180,250						$	72.22					5.9						$	11,775,745
Vested and expected to vest at June 30, 2021			363,615						$	73.64					6.2						$	23,239,725

Market-Based Restricted Stock Awards, Valuation Assumptions

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

			June 30, 2021						June 30, 2020
Underlying stock price at valuation date			$	113.27					$	91.17
Expected volatility			30.3		%				27.0		%
Risk-free interest rate			1.3		%				0.7		%

Restricted Stock and Restricted Stock Unit Award Activity

Restricted stock award activity for the six months ended June 30, 2021 is set forth below:

			Shares						Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2021			820,566						$	62.66
Granted			—						—
Vested			(334,294)						64.02
Canceled			(2,067)						82.38
Nonvested at June 30, 2021			484,205						$	61.62

Restricted stock unit award activity for the six months ended June 30, 2021 is set forth below:

			Number of Shares						Weighted-Average Remaining Contractual Term (in years)						Aggregate Intrinsic Value
Outstanding at January 1, 2021			209,784
Granted			163,380
Vested			(100,224)
Canceled			—
Outstanding at June 30, 2021			272,940						3.4						$	37,542,897
Vested and expected to vest at June 30, 2021			182,186						2.8						$	25,059,725

Employee Stock Purchase Plan, Valuation Assumptions

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

			June 30, 2021						June 30, 2020
Risk-free interest rate			0.02%						0.1%
Expected term (in years)			0.5						0.5
Dividend yield			0.00%						0.00%
Expected volatility			29.5%						24.0%
Weighted average volatility			29.5%						24.0%

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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-URI http://asc.fasb.org/extlink&oid=120381028&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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