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Earnings per share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Net income (loss) $ (20,104) $ 8,253
Amount allocated to common shareholders (in hundredths) 100.00% [1] 91.69% [1]
Basic EPS:    
Income (loss) allocable to common shareholders (20,104) 7,567
Income (loss) allocable to common shareholders - (in Shares) 88,717,000 88,555,000
Earnings Per Share, Basic $ (0.23) $ 0.09
Effect of Dilutive Securities:    
Share-based compensation plans 0 0
Share-based compensation plans - (in Shares) 0 465,000
Diluted EPS:    
Income (loss) applicable to common shareholders with assumed conversion $ (20,104) $ 7,567
Income (loss) applicable to common shareholders with assumed conversion - (in Shares) 88,717,000 89,020,000
Earnings Per Share, Diluted $ (0.23) $ 0.09
Stock Options [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from calculation of diluted EPS (in shares) 603,032 [2] 347,934 [2]
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) 442,456 [2] 0 [2]
[1] We have not allocated net losses between common and preferred shareholders, as the holders of our preferred shares do not have a contractual obligation to share in the loss.
[2] 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.