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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Basic and diluted earnings (loss) per share | 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.
Antidilutive securities excluded from calculation of diluted EPS |
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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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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