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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of restricted stock, restricted stock unit and stock option activity

The following table summarizes RSU, restricted stock and stock option activity:

			RSU or Restricted Stock						Stock Options
			Number			Weighted Average Grant Date Fair Value Per Share			Number			Weighted Average Exercise Price Per Share
Outstanding as of December 31, 2017			933,464			$51.85			5,069,956			$60.08
Granted			603,111			57.88			33,615			58.15
Forfeited or expired			(38,365)			54.07			(352,624)			64.64
Vested/exercised			(513,078)			51.58			(161,562)			44.92
Outstanding as of December 31, 2018			985,132			$53.78			4,589,385			$60.25
Granted			1,356,303			32.68			1,192,108			22.47
Forfeited or expired			(173,604)			39.57			(351,885)			60.56
Vested/exercised			(507,520)			47.72			(48,131)			30.46
Outstanding as of December 31, 2019			1,660,311			$39.88			5,381,477			$52.13
Granted			1,355,975			10.30			975,290			11.06
Forfeited or expired			(114,352)			33.74			(603,835)			59.46
Vested/exercised			(643,340)			42.23			—			—
Outstanding as of December 31, 2020			2,258,594			$21.76			5,752,932			$44.40
Options exercisable as of December 31, 2020									3,784,647			$58.80
Remaining unvested options outstanding and expected to vest									1,948,602			$16.72

During 2020, the following units were granted:

			Performance-based Award Units Granted in 2020			Weighted Average Grant Date Fair Value Per Share
2020 Performance Award Plan			385,455			$9.05
2019 Performance Award Plan			116,844			$9.77
2018 Performance Award Plan			68,866			$10.75

Schedule of fair value on grant date and significant assumptions used in Black-Scholes option-pricing model

The grant date fair value of options and other significant assumptions follow:

			January 1 - November 30, 2020			December 31, 2020			January 1 - September 30, 2019			October 1 - December 31, 2019			2018
Weighted average grant date fair value			$4.59			$9.05			$7.99			$6.93			$14.87
Expected life of options (in years)			4.6			7.2			5.6			5.4			5.3
Risk-free interest rate			0.4		%	0.5		%	2.6		%	1.7		%	2.7		%
Expected volatility			64.9		%	60.8		%	33.3		%	46.6		%	28.2		%
Expected annual dividend per share			$0.00			$0.00			$0.84			$0.40			$0.84

Summary of information related to options outstanding

Information related to options outstanding as of December 31, 2020 follows:

			Options Outstanding												Options Exercisable
Range of Exercise Prices			Number Outstanding			Weighted Average Remaining Contractual Life (In Years)			Weighted Average Exercise Price Per Share						Number Exercisable			Weighted Average Remaining Contractual Life (In Years)			Weighted Average Exercise Price Per Share
$8.81 - $29.50			2,088,027			9.2			$	17.27					130,947			8.4			$	29.03
$46.07 - $62.50			3,054,457			4.4			56.48						3,043,252			4.4			56.47
$70.76 - $79.19			610,448			2.3			76.77						610,448			2.3			76.77
			5,752,932			5.9			$	44.40					3,784,647			4.2			$	58.80

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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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 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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