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Net Income (Loss) Per Share | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
NET INCOME (LOSS) PER SHARE | NET INCOME (LOSS) PER SHARE Basic net income (loss) per share is computed by dividing net income (loss) available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per share reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock. For the years ended December 31, 2014, 2013, and 2012, 1,871,681, 1,111,021, and 479,767 shares, respectively, of common stock equivalents related to equity-based awards were not included in the diluted per share calculation as the shares would be antidilutive. The 3.25% Convertible Senior Notes were not included in the computation of diluted net income (loss) per share for the years ended December 31, 2014, 2013, and 2012 because there is no excess value upon conversion over the principal amount of the Notes.
| Year ended December 31,
In thousands except per share amounts | 2014 |  | 2013 |  | 2012
Net income (loss) available to common stockholders | $ | (1,155,884 | ) |  | $ | (650,563 | ) |  | $ | 48,677 |
Weighted average shares: |  |  |  |  |
Basic | 102,441 |  |  | 97,864 |  |  | 89,437 |
Effect of stock-based compensation plans | — |  |  | — |  |  | 166 |
Diluted | 102,441 |  |  | 97,864 |  |  | 89,603 |
Income (loss) per share: |  |  |  |  |
Basic | $ | (11.28 | ) |  | $ | (6.65 | ) |  | $ | 0.54 |
Diluted | $ | (11.28 | ) |  | $ | (6.65 | ) |  | $ | 0.54 |

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