Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net (Loss)	$ (68,662)	$ (111,599)	$ (325,389)	$ (193,780)
Net (Loss) per Common Share:
Net (Loss) per Common Share, basic and diluted (in Dollars per share)	$ (0.51)	$ (0.89)	$ (2.49)	$ (1.54)
Shares used in Computing Net (Loss) per Common Share:
WEIGHTED AVERAGE BASIC AND DILUTED (in Shares)	133,423	126,043	130,535	125,806
Stock option
Shares used in Computing Net (Loss) per Common Share:
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)	4,950	4,880	5,011	4,401
Unvested RSUs and PSUs
Shares used in Computing Net (Loss) per Common Share:
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)	5,095	2,062	5,297	1,920