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Equity-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Activity

Stock option activity during 2020 and 2021 was as follows:

		Number of Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (in years)				Aggregate Intrinsic Value (in thousands)
Options outstanding at January 1, 2020			1,360,068			$	39.40				7.57			$	1,650
Options granted			507,600				33.13				9.18				157
Options exercised			(68,700	)			29.15			N/A					854
Options cancelled			(288,662	)			39.67			N/A				N/A
Options outstanding at December 31, 2020			1,510,306				37.56				7.35				1,414
Options granted			282,320				57.15				9.76				378
Options exercised			(478,047	)			38.49			N/A					9,568
Options cancelled			(105,709	)			39.89			N/A				N/A
Options outstanding at June 30, 2021			1,208,870			$	41.57				7.83			$	20,774
Options exercisable at December 31, 2020			596,606			$	45.37				5.55			$	543
Options exercisable at June 30, 2021			388,759			$	44.28				5.88			$	5,853

Schedule of Stock Options Valuation Assumptions

The following table summarizes the grant-date fair value of options and the assumptions used to develop the fair value estimates for options granted during the six months ended June 30, 2021 and year ended December 31, 2020:

		June 30, 2021				December 31, 2020
Weighted average grant-date fair value of options		$	20.59			$	12.37
Risk-free interest rate			0.9	%			1.6	%
Expected volatility			40	%			41	%
Expected life (in years)			5.0				5.0

Restricted Stock Activity

Restricted stock activity during 2020 and 2021 was as follows:

		Number of Shares				Weighted Average Grant-Date Fair Value
Unvested at January 1, 2020			805,136			$	34.14
Granted			637,312				25.82
Cancelled			(129,683	)			34.56
Vested			(289,769	)			35.88
Unvested at December 31, 2020			1,022,996			$	28.41
Granted			284,930				57.88
Cancelled			(41,941	)			37.01
Vested			(325,282	)			30.67
Unvested at June 30, 2021			940,703			$	36.17

Restricted Stock Unit Activity

Restricted stock unit activity during 2020 and 2021 was as follows:

		Number of Units				Weighted Average Grant-Date Fair Value
Unvested at January 1, 2020			447,357			$	38.89
Granted			583,680				10.60
Performance adjustment			117,772				13.50
Cancelled			(63,056	)			43.35
Vested			(12,691	)			42.09
Unvested at December 31, 2020			1,073,062			$	20.15
Granted			149,416				61.52
Performance adjustment			345,731				24.10
Cancelled			—				—
Vested			(184,051	)			42.30
Unvested at June 30, 2021			1,384,158			$	22.66

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

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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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