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Net Income (Loss) Per Share | 12 Months Ended
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Dec. 31, 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:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In millions, except net income (loss) per share)
Numerator: |  |  |  |  |
Net income (loss) | $ | 707 |  |  | $ | (512 | ) |  | $ | 52 |
Denominator: |  |  |  |  |
Shares outstanding at the beginning of the period | 59.3 |  |  | 55.8 |  |  | 55.1 |
Weighted-average number of shares issued: |  |  |  |  |
Exchange of 1.625% Convertible Notes (1) | 1.4 |  |  | 0.1 |  |  | — |
Conversion of 1.625% Convertible Notes (1) | 0.2 |  |  | — |  |  | — |
Stock-based compensation | 0.2 |  |  | 0.5 |  |  | 0.3 |
Denominator for basic net income (loss) per share | 61.1 |  |  | 56.4 |  |  | 55.4 |
Effect of dilutive securities: |  |  |  |  |
1.125% Warrants (1) | 4.8 |  |  | — |  |  | 0.5 |
1.625% Convertible Notes (1) | 0.4 |  |  | — |  |  | — |
Stock-based compensation | 0.3 |  |  | — |  |  | 0.3 |
Denominator for diluted net income (loss) per share | 66.6 |  |  | 56.4 |  |  | 56.2 |
Net income (loss) per share: (2) |  |  |  |  |
Basic | $ | 11.57 |  |  | $ | (9.07 | ) |  | $ | 0.93 |
Diluted | $ | 10.61 |  |  | $ | (9.07 | ) |  | $ | 0.92 |
Potentially dilutive common shares excluded from calculations: (1) |  |  |  |  |
1.125% Warrants (1) | — |  |  | 1.9 |  |  | — |
1.625% Convertible Notes (1) | — |  |  | 0.4 |  |  | — |
Stock-based compensation | — |  |  | 0.3 |  |  | — |
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(1) | For more information regarding the 1.625% Convertible Notes, refer to Note 11, “Debt.” For more information and definitions regarding the 1.125% Warrants, refer to Note 14, “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 have been 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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