Note 2 - RSU Summary (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Time-Based RSUs [Member]
Shares (in shares) | shares	499,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 40.75
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares	116,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 61.45
Shares (in shares) | shares	(142,000)
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 33.69
Shares (in shares) | shares	(18,000)
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 42.92
Shares (in shares) | shares	455,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 48.18
PSUs and MPSUs [Member]
Shares (in shares) | shares	1,933,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 38.99
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares	1,253,000	[1]
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 40.77
Shares (in shares) | shares	(234,000)	[2]
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 41.14
Shares (in shares) | shares	(563,000)
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 30.07
Shares (in shares) | shares	(129,000)
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 36.82
Shares (in shares) | shares	2,260,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 42.10
MSUs [Member]
Shares (in shares) | shares	1,800,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 23.57
Shares (in shares) | shares	(180,000)
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 23.57
Shares (in shares) | shares	1,620,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 23.57
Shares (in shares) | shares	4,232,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 32.64
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares	1,369,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 42.52
Shares (in shares) | shares	(234,000)
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 41.14
Shares (in shares) | shares	(705,000)
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 30.80
Shares (in shares) | shares	(327,000)
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 29.87
Shares (in shares) | shares	4,335,000
Weighted-Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares	$ 35.81

[1] Amount reflects the maximum number of PSUs and MPSUs that can be earned assuming the achievement of the highest level of performance conditions

[2] Amount reflects the number of PSUs and MPSUs that have not been earned or may not be earned based on management's probability assessment at each reporting period.