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Note 6 - Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

		Years ended December 31,
		2018				2017				2016
Restricted share units
Pretax compensation expense		$	32,797			$	28,679			$	29,938
Tax benefit			7,740				(4,385	)			11,347
Restricted share units, net of tax		$	25,057			$	33,064			$	18,591
Performance share units
Pretax compensation expense		$	14,572			$	9,612			$	10,687
Tax benefit			3,439				(1,470	)			4,050
Performance share awards, net of tax		$	11,133			$	11,082			$	6,637

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, 2015			1,516,750			$	63.96
Granted			540,746				75.03
Vested			(520,619	)			54.78
Forfeited			(34,221	)			69.14
Unvested at December 31, 2016			1,502,656			$	71.16
Granted			158,319				90.06
Vested			(380,702	)			67.29
Forfeited			(37,745	)			75.13
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

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, 2015			490,673			$	67.04
Granted			142,114				74.71
Vested			(148,733	)			62.84
Forfeited			-				-
Unvested at December 31, 2016			484,054			$	70.58
Granted			-				-
Vested			(155,867	)			68.27
Forfeited			-				-
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