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Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Earnings Per Share [Abstract] |  |  |  |
Net income (loss) | $ (4,401) |  | $ 25,046 |
Amount allocated to common shareholders (in hundredths) | 100.00% |  | 91.85% |
Basic EPS: |  |  |  |
Income (loss) allocable to common shareholders - in Shares (000) | 88,727,000 |  | 92,965,000 |
Income (loss) allocable to common shareholders (in dollars per share) | $ (0.05) |  | $ 0.25 |
Effect of Dilutive Securities: |  |  |  |
Income (loss) allocable to common shareholders | (4,401) |  | 23,005 |
Stock compensation plans | 0 |  | 0 |
Share-based stock awards - in Shares (000) | 0 |  | 332,000 |
Diluted EPS: |  |  |  |
Income (loss) applicable to common shareholders with assumed conversion | $ (4,401) |  | $ 23,005 |
Income (loss) applicable to common shareholders with assumed conversion - in Shares (000) | 88,727,000 |  | 93,297,000 |
Income (loss) applicable to common shareholders with assumed conversion (in dollars per share) | $ (0.05) |  | $ 0.25 |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Options to purchase common stock outstanding (in shares) | 632,334,000 |  | 650,011,000 |
Options to purchase common stock outstanding (in shares) | 345,524,000 |  | 218,000,000 |
Shares repurchased (in shares) | 400,000 |  |  |
Options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from calculation of diluted EPS (in shares) | 632,334,000 | [1] | 349,000,000 | [1]
Service-Based Share Awards [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from calculation of diluted EPS (in shares) | 345,524,000 |  | 0 |
[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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