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Note 3 - Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Income (Loss) from Continuing Operations Attributable to Parent                 $ 121,088 $ 308,253 $ 281,539
Income (Loss) From Continuing Operations, Diluted, Amount                 120,873 314,069 296,297
Less: Income (loss) from discontinued operations, net of tax                 0 0 5,385
Net Income (Loss) Available to Common Stockholders, Basic                 121,088 308,253 286,924
Net Income (Loss) Available to Common Stockholders, Diluted                 $ 120,873 $ 314,069 $ 301,682
Average common shares outstanding                 215,321 211,789 199,910
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements                 4,305 2,999 2,393
Adjusted shares outstanding-diluted 220,250 219,391 215,152 221,497 224,776 225,968 226,203 239,707 220,406 229,258 246,332
Net income (loss) from continuing operations, per basic share                 $ 0.56 $ 1.46 $ 1.41
Net income (loss) from discontinued operations, per basic share                 0.00 0.00 0.03
Net (loss) income per share—basic                 0.56 1.46 1.44
Net income (loss) from continuing operations, per diluted share                 0.55 1.37 1.20
Net income (loss) from discontinued operations and disposal of discontinued operations, net of tax, per diluted share                 0.00 0.00 0.02
Net (loss) income per share—diluted $ 0.03 [1],[2] $ 0.30 [1] $ (0.13) [1] $ 0.34 [1] $ 0.27 [1] $ 0.37 [1] $ 0.44 [1] $ 0.29 [1] $ 0.55 [1] $ 1.37 [1] $ 1.22
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                 353 1,042 728
Convertible Debt [Member] | Convertible Senior Notes Due 2017 [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities                 323 207 6,293
Convertible Debt [Member] | Convertible Senior Notes Due 2019 [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Interest on Convertible Debt, Net of Tax                 $ (215) $ 5,816 $ 14,758
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities                 457 14,263 37,736
[1] 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. For all calculations, the determination of whether potential common shares are dilutive or anti-dilutive is based on net income.
[2] 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.