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Earnings per share | 12 Months Ended
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Dec. 31, 2014
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 2014, 2013, and 2012:
| For the year ended December 31, 2014
| Net income | Shares (000) | Per-Share
Net income | $ | 112,494 |  |  |
Amount allocated to common stockholders | 91.81 | % |  |
Basic EPS: |  |  |  |
Net income allocated to common stockholders | 103,283 |  | 88,823 |  | $ | 1.16 |
Effect of Dilutive Securities: |  |  |  |  |  |
Share-based compensation plans |  | 605 |  |  |
Diluted EPS: |  |  |  |  |  |
Net income allocated to common stockholders with assumed conversion | $ | 103,283 |  | 89,428 |  | $ | 1.15 |
| For the year ended December 31, 2013
| Net loss | Shares (000) | Per-Share
Net loss | $ | (40,313 | ) |  |  |
Amount allocated to common stockholders (1) | 100.00 | % |  |  |
Basic and Diluted EPS: |  |  |  |  |
Net loss allocated to common stockholders | $ | (40,313 | ) | 88,612 |  | $ | (0.45 | )
| For the year ended December 31, 2012
| Net loss | Shares (000) | Per-Share
Net loss | $ | (35,610 | ) |  |  |
Amount allocated to common stockholders (1) | 100.00 | % |  |  |
Basic and Diluted EPS: |  |  |  |  |
Net loss allocated to common stockholders | $ | (35,610 | ) | 88,534 |  | $ | (0.40 | )
(1) | We have not allocated net losses between common and preferred stockholders, as the holders of our preferred shares do not have a contractual obligation to share in the loss.
Securities excluded from the calculation of diluted EPS: |  |  |
| 2014 | 2013 | 2012
Stock options (1) | 320,553 |  | 619,833 |  | 626,334 |
Service-based share awards (1) | — |  | 442,737 |  | 396,133 |
(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.

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