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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.