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Stock Options and Employee Stock Purchase Plan (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Stock Options Activity

Stock option activity for the years ended December 31, 2020, 2019 and 2018 is summarized as follows:

			Number of Shares						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Life (In Years)						Aggregate Intrinsic Value
Options outstanding at January 1, 2018			375,675						$	31.30
Granted			400,000						75.03
Exercised			(67,898)						22.68
Canceled			—						—
Options outstanding at December 31, 2018			707,777						$	56.84
Granted			—						—
Exercised			(189,436)						32.39
Canceled			—						—
Options outstanding at December 31, 2019			518,341						$	65.77
Granted			—						—
Exercised			(42,740)						23.11
Canceled			—						—
Options outstanding at December 31, 2020			475,601						$	69.61					6.2						$13,355,721
Exercisable at December 31, 2020			175,601						$	60.35					4.7						$6,557,721
Vested and expected to vest at December 31, 2020			393,281						$	68.47					6.0						$11,490,350

Summarized Information Concerning Outstanding and Exercisable Options

The following table summarizes information concerning outstanding and exercisable options as of December 31, 2020:

						Options Outstanding																		Exercisable Options
Range of Exercise Prices						Number Outstanding December 31, 2020						Weighted Average Remaining Contractual Life						Weighted Average Exercise Price						Number Exercisable December 31, 2020						Weighted Average Exercise Price
$29.34						45,351						0.36 years						$	29.34					45,351						$	29.34
29.53						7,250						1.17 years						29.53						7,250						29.53
67.35						23,000						4.35 years						67.35						23,000						67.35
75.03						400,000						7.00 years						75.03						100,000						75.03
$29.34 - $75.03						475,601						6.15 years						$	69.61					175,601						$	60.35

Valuation Assumptions of Stock Options Granted

The weighted-average fair values of stock options granted have been estimated utilizing the following assumptions:

			Years ended December 31,
			2020						2019						2018
Risk-free interest rate			—%						—%						2.4%
Expected term (in years)			0.0						0.0						6.7
Dividend yield			—%						—%						2.2%
Expected volatility			—%						—%						29.2%
Weighted average volatility			—%						—%						29.2%

Valuation Assumptions of Market-based Restricted Stock Awards Granted

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

			December 31, 2020						December 31, 2019						December 31, 2018
Underlying stock price at valuation date			$	91.17					$	84.58					$	82.11
Expected volatility			27.0		%				28.3		%				28.4		%
Risk-free interest rate			0.7		%				2.5		%				2.9		%

Restricted Stock and Restricted Stock Unit Award Activity

Restricted stock award activity for the years ended December 31, 2020, 2019 and 2018 is set forth below:

			Shares						Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2018			605,566						$	51.57
Granted			830,256						63.55
Vested			(157,972)						61.29
Canceled			(70,839)						74.84
Nonvested at December 31, 2018			1,207,011						$	64.82
Granted			187,773						79.00
Vested			(172,884)						73.65
Canceled			(116,841)						72.58
Nonvested at December 31, 2019			1,105,059						$	64.76
Granted			1,268						98.63
Vested			(264,172)						70.25
Canceled			(21,589)						79.34
Nonvested at December 31, 2020			820,566						$	62.66

Restricted stock unit activity for the years ended December 31, 2020, 2019 and 2018 is set forth below:

			Number of Shares						Weighted-Average Remaining Contractual Life (in Years)						Aggregate Intrinsic Value
Outstanding at January 1, 2018			38,400
Granted			20,044
Vested			(11,540)
Canceled			(5,673)
Outstanding at December 31, 2018			41,231
Granted			3,844
Vested			(12,343)
Canceled			(11,858)
Outstanding at December 31, 2019			20,874
Granted			210,630
Vested			(9,029)
Canceled			(12,691)
Outstanding at December 31, 2020			209,784						3.5						$	20,493,799
Vested and expected to vest at December 31, 2020			135,944						2.7						$	13,280,344

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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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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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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