(Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net (loss)	$ (111,599)	$ (87,984)	$ (193,780)	$ (116,731)
Net (loss) per share:
Basic (in Dollars per share)	$ (0.89)	$ (0.70)	$ (1.54)	$ (0.93)
Diluted (in Dollars per share)	$ (0.89)	$ (0.70)	$ (1.54)	$ (0.93)
Shares used in computing net (loss) per share:
Weighted average basic shares outstanding (in Shares)	126,043	125,332	125,806	125,286
Dilutive securities:
Total dilutive securities (in Shares)		0		0
Weighted average diluted shares outstanding (in Shares)	126,043	125,332	125,806	125,286
Stock option
Dilutive securities:
Stock option and unvested RSUs and PSUs (in Shares)	0	0	0	0
Shares subject to stock options, unvested RSUs and PSUs omitted from the calculation of (loss) per share as their effect would have been anti-dilutive (in Shares)	4,880	3,842	4,401	3,844
Unvested RSUs and PSUs
Dilutive securities:
Stock option and unvested RSUs and PSUs (in Shares)	0	0	0	0
Shares subject to stock options, unvested RSUs and PSUs omitted from the calculation of (loss) per share as their effect would have been anti-dilutive (in Shares)	2,062	1,718	1,920	821