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Net income (loss) per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Basic Net Income (Loss) Per Share    
Basic net income (loss) $ 102,312 $ (41,140)
Weighted average common shares outstanding 214,065,000 211,681,000
Basic net income (loss) per share $ 0.48 $ (0.19)
Diluted Net Income (Loss) Per Share    
Diluted net income (loss) $ 102,312 $ (41,140)
Weighted average common shares outstanding 214,065,000 211,681,000
Dilutive stock options and RSU’s 2,996,000  
Weighted average shares used to compute diluted net income (loss) per share 217,061,000 211,681,000
Diluted net income (loss) per share $ 0.47 $ (0.19)
Anti-dilutive securities    
Potential common shares excluded from diluted net loss per share computation 9,686,952 13,622,486
Stock Options    
Anti-dilutive securities    
Potential common shares excluded from diluted net loss per share computation 9,318,013 13,104,711
Convertible Senior Notes 0.375 Percent Due 2018    
Anti-dilutive securities    
Potential common shares excluded from diluted net loss per share computation   148,836
Convertible Senior Notes 1.25 Percent Due 2020    
Anti-dilutive securities    
Potential common shares excluded from diluted net loss per share computation 368,939 368,939