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Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Activity

Stock option activity during 2018, 2019 and 2020 was as follows (aggregate intrinsic value in thousands):

		Number of Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (in years)				Aggregate Intrinsic Value
Options outstanding at January 1, 2018			974,566			$	47.89				7.46			$	3,802
Options granted			374,700				37.54				9.21				246
Options exercised			(20,989	)			17.83			N/A					383
Options cancelled			(128,737	)			50.83			N/A				N/A
Options outstanding at December 31, 2018			1,199,540				44.64				7.26				2,717
Options granted			605,200				28.50				9.21				1,343
Options exercised			(55,671	)			19.05			N/A					658
Options cancelled			(389,001	)			40.84			N/A				N/A
Options outstanding at December 31, 2019			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 exercisable at December 31, 2019			513,290			$	48.08				5.88			$	512
Options exercisable at December 31, 2020			596,606			$	45.37				5.55			$	543

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 years ended December 31, 2020, 2019 and 2018:

		Year Ended December 31,
		2020				2019				2018
Weighted average grant-date fair value of options		$	12.37			$	17.59			$	13.67
Risk-free interest rate			1.6	%			2.4	%			2.2	%
Expected volatility			41	%			38	%			37	%
Expected life (in years)			5.0				5.0				5.1

Restricted Stock Activity

Restricted stock activity during 2018, 2019 and 2020 was as follows:

		Number of Shares				Weighted Average Grant-Date Fair Value
Unvested at January 1, 2018			809,868			$	50.19
Granted			480,137				36.84
Cancelled			(88,989	)			47.57
Vested			(395,959	)			50.41
Unvested at December 31, 2018			805,057			$	42.40
Granted			700,937				28.77
Cancelled			(389,684	)			33.50
Vested			(311,174	)			44.23
Unvested at December 31, 2019			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

Restricted Stock Unit Activity

Restricted stock unit activity during 2018, 2019 and 2020 was as follows:

		Number of Units				Weighted Average Grant-Date Fair Value
Unvested at January 1, 2017			360,909			$	50.04
Granted			285,358				42.26
Cancelled			(89,173	)			55.44
Vested			(72,983	)			49.64
Unvested at December 31, 2018			484,111			$	44.52
Granted			234,408				34.54
Cancelled			(271,162	)			45.17
Vested			—				—
Unvested at December 31, 2019			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

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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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