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Net Income per Share - Computation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ (47) | $ 42 | $ 33 | $ 24 | $ 30 | $ 46 | $ 39 | $ 28 | $ 52 | $ 143 | $ 62 |
Shares outstanding at the beginning of the period (in shares) |  |  |  |  | 55 |  |  |  |  | 55 | 49 | 46
Weighted-average number of shares issued: |  |  |  |  |  |  |  |  |  |  |  |
Common stock offering (in shares) |  |  |  |  |  |  |  |  | 0 | 3 | 0 |
Convertible senior notes (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 1 |
Denominator for basic net income per share (in shares) |  |  |  |  |  |  |  |  | 55 | 52 | 47 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation (in shares) |  |  |  |  |  |  |  |  | 0 | 1 | 0 |
Convertible senior notes (in shares) |  |  |  |  |  |  |  |  | 0 | 1 | 1 |
1.125% Warrants (in shares) |  |  |  |  |  |  |  |  | 1 | 2 | 0 |
Denominator for diluted net income per share (in shares) |  |  |  |  |  |  |  |  | 56 | 56 | 48 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.85) | $ 0.77 | $ 0.58 | $ 0.44 | $ 0.54 | $ 0.84 | $ 0.78 | $ 0.58 | $ 0.93 | $ 2.75 | $ 1.33 |
Diluted (in dollars per share) | $ (0.85) | $ 0.76 | $ 0.58 | $ 0.43 | $ 0.52 | $ 0.77 | $ 0.72 | $ 0.56 | $ 0.92 | $ 2.58 | $ 1.29 |
1.125% Warrants |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 1.125% |  |  |  |  |  |  |  | 1.125% |  |  |
1.125% Warrants |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Potentially dilutive common shares excluded from calculations |  |  |  |  |  |  |  |  | 0 | 0 | 13 |

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