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Earnings per share (Tables) | 3 Months Ended
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Mar. 31, 2012
Earnings Per Share [Abstract] |
Basic and diluted earnings (loss) per share | The following table shows the basic and diluted earnings per share for three months ended March 31, 2012 and 2011:
| For the three months ended March 31,
| 2012 |  | 2011
| Income | Shares (000) | Per-Share |  | Income | Shares (000) | Per-Share
Net income (loss) | $ | (4,401 | ) |  |  |  | $ | 25,046 |  |  |
Amount allocated to common shareholders | 100 | % |  |  |  | 91.85 | % |  |
Basic EPS: |  |  |  |  |  |  |
Income (loss) allocable to common shareholders | (4,401 | ) | 88,727 |  | $ | (0.05 | ) |  | 23,005 |  | 92,965 |  | $ | 0.25 |
Effect of Dilutive Securities: |  |  |  |  |  |  |
Stock compensation plans | — |  | — |  |  |  | — |  | 332 |  |
Diluted EPS: |  |  |  |  |  |  |
Income (loss) applicable to common shareholders with assumed conversion | $ | (4,401 | ) | 88,727 |  | $ | (0.05 | ) |  | $ | 23,005 |  | 93,297 |  | $ | 0.25 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings per Share | Calculation of EPS:
| Three months ended March 31,
| 2012 | 2011
Options to purchase common stock outstanding | 632,334 |  | 650,011 |
Weighted average service-based stock awards outstanding | 345,524 |  | 218,000 |
Excluded from the calculation of diluted EPS: |  |
Stock options (1) | 632,334 |  | 349,000 |
Service-based share award | 345,524 |  | — |
(1) | These stock option awards were excluded from the calculation of diluted EPS because the exercise price of these options was greater than the average market price of the underlying common stock, except in periods when we had a net loss where all option were excluded because of their antidilutive effect on earnings 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 Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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. + References No definition available. + Details
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