Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following table summarizes information about RSUs:

	2020			2019
	Shares	Weighted average fair value		Shares	Weighted average fair value
Outstanding - beginning of the year	4,480,847	$	9.51	3,228,339	$	13.33
Granted	4,123,544	3.92		3,113,886	6.56
Vested	(1,486,371)	9.65		(1,360,219)	11.90
Forfeited	(557,648)	5.06		(501,159)	8.71
Outstanding - end of the year	6,560,372	$	6.27	4,480,847	$	9.51

Schedule of Share-based Compensation, Performance Stock Units Award Activity

The following table summarizes share information about PSUs:

	2020			2019
	Shares	Weighted average grant date fair value		Shares	Weighted average grant date fair value
Outstanding - beginning of the year	2,778,362	$	10.09	1,653,004	$	13.08
Granted	—	—		1,368,182	6.60
Vested	(303,460)	4.00		—	—
Forfeited	(744,900)	11.57		(242,824)	9.65
Outstanding - end of the year	1,730,002	$	9.31	2,778,362	$	10.09

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes information about stock option activity:

	2020			2019
	Shares	Per share weighted average exercise prices		Shares	Per share weighted average exercise prices
Options outstanding - beginning of the year	12,822,684	$	14.08	13,593,156	$	15.30
Granted	2,801,982	3.98		869,297	6.57
Exercised	(33,501)	6.82		—	—
Canceled	(1,653,126)	10.09		(533,921)	11.06
Expired	(1,123,674)	22.09		(1,105,848)	24.75
Options outstanding - end of the year	12,814,365	$	11.81	12,822,684	$	14.08
Options exercisable - end of the year	7,027,974	$	16.76	7,288,614	$	18.49

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The following table provides additional information about stock options outstanding and exercisable at December 31, 2020:

	Options Outstanding				Options Exercisable
Range of per share exercise prices	Shares	Per share weighted-average exercise price		Weighted-average remaining contractual life	Shares	Per share weighted-average exercise price		Weighted-average remaining contractual life
$3.98 - $12.64	6,762,415	$	6.57	8.2 years	976,024	$	11.26	7.3 years
$13.11 - $17.20	4,242,651	$	14.75	5.2 years	4,242,651	$	14.75	5.1 years
$19.45 - $26.07	1,809,299	$	24.43	1.0 year	1,809,299	$	24.43	1.1 years
	12,814,365	$	11.81	6.2 years	7,027,974	$	16.76	4.4 years

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table lists the weighted average of assumptions used to calculate the fair value of stock options granted:

	Years Ended December 31,
	2020		2019		2018
Expected dividend yield	5.0	%	3.0	%	9.9	%
Expected stock price volatility	43.0	%	41.5	%	37.8	%
Risk-free interest rate	1.5	%	2.5	%	2.8	%
Expected life	7 years		5 years		7 years
Weighted-average fair value per option granted	$3.98		$1.98		$1.26
Fair value of options granted	$11,152		$1,722		$6,229