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Note 3 - Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income (loss) - basic $ 155,206 $ (29,951) $ 280,814 $ 110,510
Average common shares outstanding - basic 193,436 193,299 193,692 197,545
Net income (loss) per share - basic $ 0.80 $ (0.15) $ 1.45 $ 0.56
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income (loss)—diluted $ 155,206 $ (29,951) $ 280,814 $ 110,510
Dilutive effect of share-based compensation arrangements 1,202 0 1,294 1,201
Adjusted average common shares outstanding—diluted 194,638 193,299 194,986 198,746
Net income (loss) per share—diluted $ 0.80 $ (0.15) $ 1.44 $ 0.56
Stock Compensation Plan        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Shares of common stock equivalents 0 2,295 0 1,213