Note 17 - Net Income Per Share Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income from continuing operations - basic		$ 66,249	$ 91,727
Net income From continuing operations - diluted		69,639	95,400
Income from discontinued operations, net of tax		0	530
Net income - basic		66,249	92,257
Net income - diluted		$ 69,639	$ 95,930
Average common shares outstanding - basic		203,706	191,224
Dilutive effect of stock-based compensation arrangements (2)	[1]	2,418	3,202
Adjusted average common shares outstanding - diluted		239,707	243,048
Net income from continuing operations, per basic share		$ 0.33	$ 0.48
Income from discontinued operations and disposal of discontinued operations, net of tax, per basic share		0.00	0.00
Net income per share - basic		0.33	0.48
Net income from continuing operations, per diluted share		0.29	0.39
Income from discontinued operations and disposal of discontinued operations, net of tax, per diluted share		0.00	0.00
Net income per share - diluted		$ 0.29	$ 0.39
Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		709	540
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		1,902	0
Convertible Debt [Member] | Convertible Senior Notes Due 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment for dilutive Convertible Senior Notes due 2019, net of tax (1)	[2]	$ 3,390	$ 3,673
Dilutive effect of Convertible Senior Notes		33,583	37,736
Convertible Debt [Member] | Convertible Senior Notes Due 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of Convertible Senior Notes	[1]	0	10,886

[1] The following number of shares of our common stock equivalents issued under our stock-based compensation arrangements and convertible debt were not included in the calculation of net income per share because they were anti-dilutive: Three Months EndedMarch 31,(in thousands)2016 2015Shares of common stock equivalents709 540Shares of Convertible Senior Notes due 20171,902 —

[2] As applicable, includes coupon interest, amortization of discount and fees, and other changes in income or loss that would result from the assumed conversion.