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Note 6 - Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Years ended December 31,
		2020				2019				2018
Restricted share units
Pretax compensation expense		$	47,044			$	38,632			$	32,797
Tax benefit			11,300				9,337				7,740
Restricted share units, net of tax		$	35,744			$	29,295			$	25,057
Performance share units
Pretax compensation expense		$	13,654			$	14,692			$	14,572
Tax benefit			3,280				3,551				3,439
Performance share awards, net of tax		$	10,374			$	11,141			$	11,133

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Restricted Share Units		Number of Shares				Weighted Average Grant Date Fair Value
Unvested at December 31, 2017			1,242,528			$	74.71
Granted			370,669				119.82
Vested			(337,512	)			79.02
Forfeited			(29,850	)			83.69
Unvested at December 31, 2018			1,245,835			$	86.80
Granted			440,255				99.60
Vested			(341,218	)			85.61
Forfeited			(31,454	)			93.91
Unvested at December 31, 2019			1,313,418			$	91.22
Granted			511,859				110.49
Vested			(457,437	)			93.78
Forfeited			(22,694	)			102.03
Unvested at December 31, 2020			1,345,146			$	97.22

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

Performance Share Units		Number of Shares				Weighted Average Grant Date Fair Value
Unvested at December 31, 2017			328,187			$	71.68
Granted			150,763				122.57
Vested			(118,438	)			69.29
Forfeited			-				-
Unvested at December 31, 2018			360,512			$	93.74
Granted			142,156				98.58
Vested			(127,140	)			93.46
Forfeited			-				-
Unvested at December 31, 2019			375,528			$	95.67
Granted			202,023				112.87
Vested			(145,038	)			89.75
Forfeited			(98,588	)			110.19
Unvested at December 31, 2020			333,925			$	109.57

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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-SubTopic 10
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