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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic Net Income (Loss) Per Share        
Basic net income (loss) per share $ 149,456 $ 290,298 $ 202,991 $ (430,344)
Weighted average common shares outstanding 220,083,000 217,549,000 219,942,000 217,135,000
Basic net income (loss) per share $ 0.68 $ 1.33 $ 0.92 $ (1.98)
Diluted Net Income (Loss) Per Share        
Diluted net income (loss) $ 149,456 $ 290,298 $ 202,991 $ (430,344)
Weighted average common shares outstanding 220,083,000 217,549,000 219,942,000 217,135,000
Dilutive stock options and awards 2,167,000 2,885,000 2,119,000  
Weighted average shares used to compute diluted net income (loss) per share 222,250,000 220,434,000 222,061,000 217,135,000
Diluted net income (loss) per share $ 0.67 $ 1.32 $ 0.91 $ (1.98)
Anti-dilutive securities        
Potential common shares excluded from diluted net income (loss) per share computation 9,238,385 5,336,636 8,982,288 14,964,275
Stock Options        
Anti-dilutive securities        
Potential common shares excluded from diluted net income (loss) per share computation 9,238,385 4,970,884 8,982,288 14,598,523
Convertible Senior Notes 1.25 Percent Due 2020        
Anti-dilutive securities        
Potential common shares excluded from diluted net income (loss) per share computation   365,752   365,752