Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of all common stock option activity

The following table summarizes our stock option activity for the year ended December 31, 2021:

	Number of Shares (In thousands)	Weighted-Average Exercise Price per Share		Weighted-Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2020	4,366	$	9.70
Granted	180	19.39
Exercised	(1,335)	9.72
Forfeited or expired	(185)	8.49
Outstanding at December 31, 2021	3,026	$	10.34	6.69 years	$	43,735
Fully vested at December 31, 2021 and expected to vest thereafter	2,972	$	10.30	6.66 years	$	43,049
Exercisable at December 31, 2021	1,880	$	9.10	5.87 years	$	29,502

Assumptions used in valuing the weighted average fair values of the options granted

The following assumptions were used to calculate the weighted-average fair values of the options granted:

	For the Year Ended December 31,
	2021			2020			2019
Expected life (in years)	6.7			5.6			6.0
Risk-free interest rate	1.3		%	0.3		%	2.5		%
Volatility	54		%	52		%	43		%
Dividend yield	0.8%			0.3%			—
Weighted-average grant date fair value per option granted	$	9.54		$	5.79		$	4.06

Restricted share activity

The following table summarizes our RSU and PSU activity for the year ended December 31, 2021:

	Number of Shares (In thousands)	Weighted- average Grant Date Fair Value (Per Share)
Non-vested at December 31, 2020	—	$	—
Awards granted	295	22.48
Awards vested	—	—
Awards forfeited	(9)	22.58
Non-vested at December 31, 2021	286	22.48