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Earnings per share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Net income (loss) $ 20,344 $ (29,384) $ 240 $ (21,131)
Amount allocated to common stockholders (in hundredths) 91.80% [1] 100.00% [1] 91.78% 100.00%
Basic EPS:        
Income (loss) allocable to common stockholders 18,675 (29,384) 220 (21,131)
Income (loss) allocable to common stockholders - (in Shares) 88,787,000 88,597,000 88,752,000 88,576,000
Earnings Per Share, Basic $ 0.21 $ (0.33) $ 0.00 $ (0.24)
Effect of Dilutive Securities:        
Share-based compensation plans 0 0 0 0
Share-based compensation plans - (in Shares) 565,000 0 540,000 0
Diluted EPS:        
Income (loss) applicable to common stockholders with assumed conversion $ 18,675 $ (29,384) $ 220 $ (21,131)
Income (loss) applicable to common stockholders with assumed conversion - (in Shares) 89,352,000 88,597,000 89,292,000 88,576,000
Earnings Per Share, Diluted $ 0.21 $ (0.33) $ 0.00 $ (0.24)
Stock Options [Member]
        
Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted EPS (in shares) 347,433 [2] 620,334 [2] 347,433 [2] 620,334 [2]
Service-based share awards [Member]
        
Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted EPS (in shares) 0 [2] 576,510 [2] 0 [2] 496,234 [2]
[1] We have not allocated net losses between common and preferred stockholders, 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.