Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Summary of Information Concerning Stock Options Outstanding Including the Related Transactions under the Stock Option Plans



				Weighted-
				average
		Weighted-		remaining	Aggregate
	Number	average		contractual	intrinsic
	of shares	exercise		term in	value
	(in thousands)	price		years	(in thousands)
Options Outstanding as of December 31, 2019	13,172	$	21.94
Granted	10,653		19.65
Exercised	(2,560)		18.88
Forfeited and Expired	(166)		20.04
Options Outstanding as of September 30, 2020	21,099		21.17	7.24	$	239,564
Options Expected to Vest as of September 30, 2020	20,703		21.19	7.19		234,719
Options Exercisable as of September 30, 2020	7,400		19.38	3.56		96,460

Valuation of Option Grants under Stock Option Plans



	Three months ended	Nine months ended
	September 30,	September 30,
	2019	2020			2019
Expected volatility	29.5%	32.9	-	32.9%	29.5	-	29.9%
Weighted-average volatility	29.5%	32.9	-	32.9%	29.5	-	29.9%
Expected dividends	2.95%	4.48	-	4.48%	2.36	-	2.95%
Risk-free rate	1.5%	0.5	-	0.5%	1.5	-	2.4%
Average risk-free rate	1.5%	0.5	-	0.5%	1.5	-	2.4%
Expected term (in years)	7.4	7.4	-	7.4	7.4	-	7.4
Pre-vesting executive departure rate	0.6%	0.6	-	0.6%	0.6	-	0.6%
Pre-vesting non-executive departure rate		2.5	-	2.5%

(1)Stock options were granted during the three months ended June 30, 2020, and three months ended June 30 and September 30, 2019. There were no stock options granted during the three months ended March 31 and September 30, 2020, and the three months ended March 31, 2019.

Summary of the Status of Non-vested Time-based Restricted Stock and Restricted Stock Units



		Weighted
	Number	average
	of shares	grant-date
	(in thousands)	fair value
Non-vested shares and share units at December 31, 2019	5,189	$	27.58
Granted	9,272		20.69
Vested	(1,176)		27.50
Forfeited	(192)		24.42
Non-vested shares and share units at September 30, 2020	13,093	$	22.76