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Net income (loss) per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Basic Net Income (Loss) Per Share        
Basic net income (loss) per share $ (15,203) $ 128,271 $ (445,547) $ 335,901
Weighted average common shares outstanding 218,784,000 215,199,000 217,684,000 214,628,000
Basic net income (loss) per share $ (0.07) $ 0.60 $ (2.05) $ 1.57
Diluted Net Income (Loss) Per Share        
Diluted net income (loss) $ (15,203) $ 128,271 $ (445,547) $ 335,901
Weighted average common shares outstanding 218,784,000 215,199,000 217,684,000 214,628,000
Dilutive stock options and awards   2,592,000   2,765,000
Weighted average shares used to compute diluted net income (loss) per share 218,784,000 217,791,000 217,684,000 217,393,000
Diluted net income (loss) per share $ (0.07) $ 0.59 $ (2.05) $ 1.55
Anti-dilutive securities        
Potential common shares excluded from diluted net income (loss) per share computation 15,678,728 9,262,535 15,678,728 9,826,380
Stock Options        
Anti-dilutive securities        
Potential common shares excluded from diluted net income (loss) per share computation 15,447,389 8,893,596 15,447,389 9,457,441
Convertible Senior Notes 1.25 Percent Due 2020        
Anti-dilutive securities        
Potential common shares excluded from diluted net income (loss) per share computation 231,339 368,939 231,339 368,939