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Stock-Based Compensation and Other Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock Options Activity

The following table summarizes the collective activity under the plans:

			Number of Options						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Term						Aggregate Intrinsic Value
Outstanding at December 31, 2017			3,834						$	7.367
Granted			518						10.878
Exercised			(909)						7.367
Forfeited			(87)						4.726
Expired			(51)						9.146
Outstanding at December 31, 2018			3,305						8.050
Granted			1,330						14.026
Exercised			(916)						7.362
Forfeited			(210)						8.070
Expired			(4)						9.904
Outstanding at December 31, 2019			3,505						10.524
Granted			406						25.668
Exercised			(946)						9.491
Forfeited			(49)						13.251
Expired			—						—
Outstanding at December 31, 2020			2,916						$	12.919					7.1 years						$	114,659
Options exercisable at December 31, 2020			1,004						$	7.877					4.6 years						$	44,555
Expected to vest at December 31, 2020			1,912						$	15.568					8.4 years						$	70,103

The following table sets forth additional disclosures about our plans:

			Year Ended December 31,
			2020						2019						2018
Aggregate intrinsic value of options exercised			$	19,762					$	7,154					$	5,588
Cash received from stock option exercises			$	8,995					$	6,742					$	6,696
Weighted-average fair value of stock options granted			$	11.52					$	6.33					$	5.20
Stock-based compensation expense (1)			$	1,933					$	1,620					$	1,258
(1) Included in selling, general and administrative expenses in the accompanying consolidated statements of income and includes expense in connection with our ESPP.

Schedule of Stock Options Valuation Assumptions

The following table sets forth the significant assumptions used in the model:

			Year Ended December 31,
			2020						2019						2018
Expected dividend yield			—%						—%						—%
Risk-free interest rate			0.35% -0.76%						1.60%-2.39%						2.71%-3.00%
Expected volatility			43%-48%						43%-44%						43%-45%
Expected life			6.5 years						6.5 years						6.5 years

Schedule of Defined Contribution Plan Disclosures

The following table sets forth our matching contributions under the plans:

			Year Ended December 31,
			2020						2019						2018
401(k) plan			$	5,650					$	5,452					$	4,957
Group Personal Pension Plan			202						190						161
Registered Retirement Savings Plan			348						356						351
Total matching contributions			$	6,200					$	5,998					$	5,469

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Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans.

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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 stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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