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Note 6 - Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

		Years ended December 31,
		2016				2015				2014
Restricted share units
Pretax compensation expense		$	29,938			$	27,898			$	27,256
Tax benefit			11,347				10,629				10,360
Restricted share units, net of tax		$	18,591			$	17,269			$	16,896
Performance share units
Pretax compensation expense		$	10,687			$	9,330			$	7,882
Tax benefit			4,050				3,555				2,996
Performance share awards, net of tax		$	6,637			$	5,775			$	4,886
Stock options
Pretax compensation expense		$	-			$	-			$	195
Tax benefit			-				-				74
Stock option expense, net of tax		$	-			$	-			$	121

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, 2013			2,421,430			$	41.49
Granted			447,780				75.61
Vested			(808,914	)			37.33
Forfeited			(119,298	)			47.81
Unvested at December 31, 2014			1,940,998			$	51.74
Granted			390,143				74.86
Vested			(783,483	)			39.45
Forfeited			(30,908	)			54.89
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

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, 2013			408,025			$	56.78
Granted			106,945				76.22
Vested			(81,075	)			53.26
Forfeited			-				-
Unvested at December 31, 2014			433,895			$	62.23
Granted			160,574				74.37
Vested			(103,796	)			58.28
Forfeited			-				-
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

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Stock Options		Number of Shares (in thousands)				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (in years)				Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2013			440			$	19.08				1.67			$	25.6
Exercised			(341	)			18.70				-				19.9
Forfeited			(1	)			19.08				-				-
Outstanding at December 31, 2014			98			$	20.40				0.86			$	6.3
Exercised			(95	)			20.35				-				5.8
Forfeited			(1	)			24.27				-				-
Outstanding at December 31, 2015			2			$	20.76				0.05			$	0.1
Exercised			(2	)			20.76				-				-
Forfeited			-				-				-				-
Outstanding at December 31, 2016			-			$	-				-			$	-
Exercisable			-			$	-				-			$	-