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Stock Options and Employee Stock Purchase Plan (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Stock Option Activity

The following table represents stock option activity for the three months ended March 31, 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			(15,117)						29.34
Canceled			—						—
Outstanding at March 31, 2021			460,484						$	70.93					6.1						$	22,531,404
Exercisable at March 31, 2021			210,484						$	66.06					5.3						$	11,323,904
Vested and expected to vest at March 31, 2021			387,924						$	70.16					6.0						$	19,278,539

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:

			March 31, 2021						March 31, 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 three months ended March 31, 2021 is set forth below:

			Shares						Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2021			820,566						$	62.66
Granted			—						—
Vested			(183,604)						66.10
Canceled			(480)						83.26
Nonvested at March 31, 2021			636,482						$	61.76

Restricted stock unit award activity for the three months ended March 31, 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			147,928
Vested			(52,335)
Canceled			—
Outstanding at March 31, 2021			305,377						3.9						$	36,602,487
Vested and expected to vest at March 31, 2021			193,564						3.1						$	23,200,612

Employee Stock Purchase Plan, Valuation Assumptions

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

			March 31, 2021						March 31, 2020
Risk-free interest rate			0.09%						1.57%
Expected term (in years)			0.5						0.5
Dividend yield			0.00%						0.00%
Expected volatility			40.53%						23.95%
Weighted average volatility			40.53%						23.95%

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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
-Subparagraph (d)
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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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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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