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Note 17 - Net Income Per Share Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Earnings Per Share, Diluted $ 0.29 $ 0.67 $ 0.90 $ 2.37
Income from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share 0.00 0.09 0.02 0.64
Income from Continuing Operations, Per Diluted Share 0.29 0.58 0.88 1.73
Earnings Per Share, Basic 0.34 0.80 1.08 2.91
Income from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share 0.00 0.11 0.03 0.82
Income from Continuing Operations, Per Basic Share $ 0.34 $ 0.69 $ 1.05 $ 2.09
Weighted-average number of common and common equivalent shares outstanding—diluted 250,795 238,067 246,993 230,662
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements [1] 3,323 2,939 3,075 2,904
Weighted-average number of common shares outstanding—basic 207,938 191,050 197,562 182,357
Net Income Available to Common Stockholders, Diluted $ 73,805 $ 159,142 $ 223,490 $ 547,692
Net Income Available to Common Stockholders, Basic 70,091 153,590 212,396 531,182
Income from discontinued operations, net of tax 0 21,559 5,385 149,634
Income From Continuing Operations, Diluted, Amount 73,805 137,583 218,105 398,058
Income from Continuing Operations Attributable to Parent $ 70,091 $ 132,031 $ 207,011 $ 381,548
Convertible Debt [Member] | Convertible Senior Notes Due 2019        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 37,736 37,736 37,736 37,736
Interest on Convertible Debt, Net of Tax [2] $ 3,714 $ 5,552 $ 11,094 $ 16,510
Convertible Debt [Member] | Convertible Senior Notes Due 2017        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 1,798 6,342 8,620 7,665
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 469 557 730 557
[1] The following number of shares of our common stock equivalents issued under our stock-based compensation arrangements were not included in the calculation of net income per share because they were anti-dilutive: Three Months EndedSeptember 30, Nine Months EndedSeptember 30,(in thousands)2015 2014 2015 2014Shares of common stock equivalents469 557 730 557
[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.