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Earnings (loss) per share (Tables) | 3 Months Ended
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Mar. 31, 2016
Earnings Per Share [Abstract] |
Basic and diluted earnings (loss) per share | 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 |
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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- 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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