Note 15 - Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

						Weighted-
						average
				Weighted-		remaining		Aggregate
	Number			average		contractual		intrinsic
	of shares			exercise		term		value
	(in thousands)			price		(in years)		(in thousands)
Options outstanding as of December 31, 2020		17,095		$	21.60
Granted		—			—
Exercised		(4,464	)		20.17
Forfeited and expired		(324	)		21.98
Options outstanding as of September 30, 2021		12,307			22.10		6.74	$	176,960
Options expected to vest as of September 30, 2021		12,206			22.13		6.72		175,319
Options exercisable as of September 30, 2021		6,919			20.90		5.53		107,865

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three months ended
	June 30,
	2020
Expected volatility		32.9	%
Weighted-average volatility		32.9	%
Expected dividends		4.48	%
Risk-free rate		0.5	%
Average risk-free rate		0.5	%
Expected term (in years)		7.4
Pre-vesting executive departure rate		0.6	%
Pre-vesting non-executive departure rate		2.5	%

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

				Weighted
	Number			average
	of shares			grant-date
	(in thousands)			fair value
Non-vested shares and share units at December 31, 2020		12,943		$	22.87
Granted		1,399			42.07
Vested		(3,518	)		22.82
Forfeited		(424	)		23.74
Non-vested shares and share units at September 30, 2021		10,400		$	25.44

Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block]

				Weighted
	Number			average
	of shares			grant-date
	(in thousands)			fair value
Non-vested share units at December 31, 2020		1,765		$	28.06
Granted		1,222			38.82
Vested		(119	)		28.06
Forfeited		(79	)		31.83
Non-vested share units at September 30, 2021		2,789		$	32.67