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Earnings (loss) per share | 9 Months Ended
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Sep. 30, 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. In periods when we report a net loss, all share-based compensation awards are excluded from the calculation of diluted weighted average shares outstanding because of their antidilutive effect on loss per share. In periods when we report net income, certain share-based compensation awards may be excluded from the calculation of diluted EPS if the exercise price was greater than the average market price of the underlying common stock. The following table shows the basic and diluted earnings (loss) per share for the three and nine months ended September 30, 2016 and 2015:
| For the three months ended September 30,
| 2016 |  | 2015
| Loss | Shares (000) | Per-Share |  | Loss | Shares (000) | Per-Share
Net loss | $ | (58,273 | ) |  |  |  | $ | (56,112 | ) |  |
Amount allocated to common stockholders | 100.00 | % |  |  |  | 100.00 | % |  |
Basic and diluted EPS: |  |  |  |  |  |  |
Net loss allocated to common stockholders | $ | (58,273 | ) | 87,076 |  | $ | (0.67 | ) |  | $ | (56,112 | ) | 86,907 |  | $ | (0.65 | )
| For the nine months ended September 30,
| 2016 |  | 2015
| Loss | Shares (000) | Per-Share |  | Income | Shares (000) | Per-Share
Net loss | $ | (83,951 | ) |  |  |  | $ | (16,230 | ) |  |
Amount allocated to common stockholders | 100.00 | % |  |  |  | 100.00 | % |  |
Basic and diluted EPS: |  |  |  |  |  |  |
Net loss allocated to common stockholders | $ | (83,951 | ) | 87,059 |  | $ | (0.96 | ) |  | $ | (16,230 | ) | 87,524 |  | $ | (0.19 | )
Securities excluded from the calculation of diluted EPS: | Three months ended September 30, | Nine months ended September 30,
| 2016 | 2015 | 2016 | 2015
Stock options | 372,569 |  | 317,266 |  | 391,375 |  | 327,599 |
Service-based share awards | 1,449,520 |  | 646,128 |  | 1,157,077 |  | 599,001 |

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