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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic Net Income (Loss) Per Share      
Basic net income (loss) per share $ 948,581 $ (295,697) $ 446,906
Weighted average common shares outstanding 220,428,000 218,073,000 214,913,000
Basic net income (loss) per share $ 4.30 $ (1.36) $ 2.08
Diluted Net Income (Loss) Per Share      
Diluted net income (loss) $ 948,581 $ (295,697) $ 446,906
Weighted average common shares outstanding 220,428,000 218,073,000 214,913,000
Dilutive stock options and awards 1,646,000   2,744,000
Weighted average shares used to compute diluted net income (loss) per share 222,074,000 218,073,000 217,657,000
Diluted net income (loss) per share $ 4.27 $ (1.36) $ 2.05
Anti-dilutive securities      
Potential common shares excluded from diluted net income (loss) per share computation 10,106,837 15,274,871 9,718,828
Convertible Senior Notes 1.25 Percent Due 2020      
Net income per share      
Interest rate of debt (as a percent)   1.25%  
Employee Stock Option      
Anti-dilutive securities      
Potential common shares excluded from diluted net income (loss) per share computation 10,106,837 15,274,871 9,349,889
Convertible Senior Notes 1.25 Percent Due 2020      
Anti-dilutive securities      
Potential common shares excluded from diluted net income (loss) per share computation     368,939