(Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net (loss) income	$ (87,984)	$ 2,537	$ (116,731)	$ 43,564
Net (loss) income per share:
Basic (in Dollars per share)	$ (0.70)	$ 0.02	$ (0.93)	$ 0.35
Diluted (in Dollars per share)	$ (0.70)	$ 0.02	$ (0.93)	$ 0.35
Shares used in computing net (loss) income per share:
Weighted average basic shares outstanding (in Shares)	125,332	124,660	125,286	124,541
Dilutive securities:
Stock option and unvested RSUs (in Shares)	0	534	0	314
Total dilutive securities (in Shares)		534		314
Weighted average diluted shares outstanding (in Shares)	125,332	125,194	125,286	124,855
Shares subject to stock options omitted from the calculation of (loss) income per share as their effect would have been anti-dilutive (in Shares)	3,842	2,268	3,815	3,991

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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