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Equity-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Activity

Stock option activity during 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, 2019			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			443,200				33.72				9.91				—
Options exercised			—				—			N/A					—
Options cancelled			(105,462	)			41.00			N/A				N/A
Options outstanding at March 31, 2020			1,697,806			$	37.81				7.97			$	659
Options exercisable at December 31, 2019			513,290			$	48.08				5.88			$	512
Options exercisable at March 31, 2020			702,956			$	44.08				6.36			$	479

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 three months ended March 31, 2020 and year ended December 31, 2019:

		March 31, 2020				December 31, 2019
Weighted average grant-date fair value of options		$	12.29			$	17.59
Risk-free interest rate			1.6	%			2.4	%
Expected volatility			39	%			38	%
Expected life (in years)			5.0				5.0

Restricted Stock Activity

Restricted stock activity during 2019 and 2020 was as follows:

		Number of Shares				Weighted Average Grant-Date Fair Value
Unvested at January 1, 2019			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			511,006				25.37
Cancelled			(57,782	)			35.55
Vested			(160,398	)			36.73
Unvested at March 31, 2020			1,097,962			$	29.61

Restricted Stock Unit Activity

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

		Number of Units				Weighted Average Grant-Date Fair Value
Unvested at January 1, 2019			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
Cancelled			(10,123	)			42.09
Vested			(12,691	)			42.09
Unvested at March 31, 2020			1,008,223			$	22.44

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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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