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Earnings (loss) per share | 3 Months Ended
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Mar. 31, 2016
Earnings Per Share [Abstract] |
Earnings (loss) per share | Earnings (loss) per share Basic earnings (loss) per share ("EPS") amounts are calculated by dividing net income (loss) allocated to common stockholders by the weighted average number of common shares outstanding. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive common shares outstanding. The following table shows the basic and diluted earnings (loss) per share for the three months ended March 31, 2016 and 2015:
| For the three months ended March 31,
| 2016 |  | 2015
| Loss | Shares (000) | Per-Share |  | Income | Shares (000) | Per-Share
Net income (loss) | $ | (16,163 | ) |  |  |  | $ | 73,779 |  |  |
Amount allocated to common stockholders | 100.00 | % |  |  |  | 91.91 | % |  |
Basic EPS: |  |  |  |  |  |  |
Net income (loss) allocated to common stockholders | (16,163 | ) | 87,040 |  | $ | (0.19 | ) |  | 67,813 |  | 88,814 |  | $ | 0.76 |
Effect of Dilutive Securities: |  |  |  |  |  |  |
Share-based compensation plans | — |  | — |  |  |  | — |  | 555 |  |
Diluted EPS: |  |  |  |  |  |  |
Net income (loss) allocated to common stockholders | $ | (16,163 | ) | 87,040 |  | $ | (0.19 | ) |  | $ | 67,813 |  | 89,369 |  | $ | 0.76 |
Securities excluded from the calculation of diluted EPS: | Three months ended March 31,
| 2016 | 2015
Stock options (1) | 393,237 |  | 333,266 |
Service-based share awards (1) | 498,809 |  | — |
(1) | In periods when we report a net loss, all share awards are excluded from the calculation of diluted weighted average shares outstanding because of their antidilutive effect on earnings (loss) per share. In periods when we report net income, certain option awards may be excluded from the calculation of diluted EPS if the exercise price of the option award was greater than the average market price of the underlying common stock.

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