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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic Net Income (Loss) Per Share        
Basic net income (loss) per share $ 181,739 $ (15,203) $ 384,730 $ (445,547)
Weighted average common shares outstanding 220,845,000 218,784,000 220,243,000 217,684,000
Basic net income (loss) per share $ 0.82 $ (0.07) $ 1.75 $ (2.05)
Diluted Net Income (Loss) Per Share        
Diluted net income (loss) $ 181,739 $ (15,203) $ 384,730 $ (445,547)
Weighted average common shares outstanding 220,845,000 218,784,000 220,243,000 217,684,000
Dilutive stock options and awards 1,403,000   1,870,000  
Weighted average shares used to compute diluted net income (loss) per share 222,248,000 218,784,000 222,113,000 217,684,000
Diluted net income (loss) per share $ 0.82 $ (0.07) $ 1.73 $ (2.05)
Anti-dilutive securities        
Potential common shares excluded from diluted net income (loss) per share computation 11,841,440 15,678,728 9,917,824 15,678,728
Stock Options        
Anti-dilutive securities        
Potential common shares excluded from diluted net income (loss) per share computation 11,841,440 15,447,389 9,917,824 15,447,389
Convertible Senior Notes 1.25 Percent Due 2020        
Anti-dilutive securities        
Potential common shares excluded from diluted net income (loss) per share computation   231,339   231,339