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Net Loss per Share - Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Net loss $ (200,389) $ (107,775)
Weighted average common shares used for basic and diluted net loss per share computation (in shares) 91,104 88,467
Net loss per common share:    
Basic and Diluted (in usd per share) $ (2.20) $ (1.22)