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Note 3 - Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Net income-basic                 $ 606,011 $ 121,088 $ 308,253
Net income —diluted                 $ 606,011 $ 120,873 $ 314,069
Average common shares outstanding—basic                 214,267 215,321 211,789
Dilutive effect of stock-based compensation arrangements [1]                 4,286 4,305 2,999
Adjusted average common shares outstanding—diluted 217,883 217,902 217,830 219,883 220,250 219,391 215,152 221,497 218,553 220,406 229,258
Net income per share—basic                 $ 2.83 $ 0.56 $ 1.46
Net income per share—diluted $ 0.64 [2] $ 0.66 [2] $ 0.96 [2] $ 0.52 [2] $ 0.03 [2],[3] $ 0.30 [2] $ (0.13) [2] $ 0.34 [2] $ 2.77 [2] $ 0.55 [2] $ 1.37
Stock Compensation Plan                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                 337 353 1,042
Convertible Debt | Convertible Senior Notes Due 2017                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Dilutive effect of Convertible Senior Notes                 0 323 207
Convertible Debt | 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 [4]                 $ 0 $ (215) $ 5,816
Dilutive effect of Convertible Senior Notes                 0 457 14,263
[1] The following number of shares of our common stock equivalents issued under our share-based compensation arrangements were not included in the calculation of diluted net income per share because they were anti-dilutive:
 
Year Ended December 31,
(In thousands)
2018
 
2017
 
2016
Shares of common stock equivalents
337

 
353

 
1,042
[2] Diluted net income per share is computed independently for each period presented. Consequently, the sum of the quarters may not equal the total net income per share for the year.
[3] The fourth quarter of 2017 reflects an incremental tax provision related to the remeasurement of our net deferred tax assets as a result of the enactment of the TCJA.
[4] As applicable, includes coupon interest, amortization of discount and fees, and other changes in income or loss that would result from the assumed conversion. Included in the year ended December 31, 2017 is a benefit related to our adjustment of estimated accrued expense to actual amounts, resulting from the January 2017 settlement of our obligations on the remaining Convertible Senior Notes due 2019.