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Net Income (Loss) per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Net Income (Loss) per Share | Net Income (Loss) per Share The following table sets forth the calculation of basic and diluted net income (loss) per share:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In millions, except net income per share)
Numerator: |  |  |  |  |  |  |
Net income (loss) | $ | 197 |  |  | $ | (97 | ) |  | $ | 506 |  |  | $ | (250 | )
Denominator: |  |  |  |  |  |  |
Shares outstanding at the beginning of the period | 61.3 |  |  | 56.5 |  |  | 59.3 |  |  | 55.8 |
Weighted-average number of shares issued: |  |  |  |  |  |  |
Exchange of 1.625% Notes (1) | — |  |  | — |  |  | 1.3 |  |  | — |
Stock-based compensation | — |  |  | — |  |  | 0.2 |  |  | 0.4 |
Denominator for basic net income per share | 61.3 |  |  | 56.5 |  |  | 60.8 |  |  | 56.2 |
Effect of dilutive securities: |  |  |  |  |  |  |
1.125% Warrants (1) | 5.6 |  |  | — |  |  | 5.0 |  |  | — |
1.625% Notes (1) | 0.6 |  |  | — |  |  | 0.5 |  |  | — |
Stock-based compensation | 0.4 |  |  | — |  |  | 0.3 |  |  | — |
Denominator for diluted net income per share | 67.9 |  |  | 56.5 |  |  | 66.6 |  |  | 56.2 |
Net income (loss) per share: (2) |  |  |  |  |  |  |
Basic | $ | 3.22 |  |  | $ | (1.70 | ) |  | $ | 8.32 |  |  | $ | (4.44 | )
Diluted | $ | 2.90 |  |  | $ | (1.70 | ) |  | $ | 7.60 |  |  | $ | (4.44 | )
Potentially dilutive common shares excluded from calculations: |  |  |  |  |  |  |
1.125% Warrants (1) | — |  |  | 2.3 |  |  | — |  |  | 1.3 |
1.625% Notes (1) | — |  |  | 0.6 |  |  | — |  |  | 0.3 |
Stock-based compensation | — |  |  | 0.2 |  |  | — |  |  | 0.3 |
______________________________
(1) | For more information and definitions regarding the 1.625% Notes, refer to Note 7, “Debt.” For more information and definitions regarding the 1.125% Warrants, refer to Note 9, “Stockholders' Equity.” The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method. Certain potentially dilutive common shares issuable are not included in the computation of diluted net income (loss) per share because to do so would be anti-dilutive.
(2) | Source data for calculations in thousands.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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