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Earnings per share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Net income (loss) $ 50,405 $ (9,507) $ 50,645 $ (30,638)
Amount allocated to common stockholders (in hundredths) 91.81% [1] 100.00% [1] 91.79% [1] 100.00% [1]
Basic EPS:        
Income (loss) allocable to common stockholders 46,277 (9,507) 46,487 (30,638)
Income (loss) allocable to common stockholders - (in Shares) 88,827,000 88,611,000 88,777,000 88,588,000
Earnings Per Share, Basic $ 0.52 $ (0.11) $ 0.52 $ (0.35)
Effect of Dilutive Securities:        
Share-based compensation plans 0 0 0 0
Share-based compensation plans - (in Shares) 705,000 0 595,000 0
Diluted EPS:        
Income (loss) applicable to common stockholders with assumed conversion $ 46,277 $ (9,507) $ 46,487 $ (30,638)
Income (loss) applicable to common stockholders with assumed conversion - (in Shares) 89,532,000 88,611,000 89,372,000 88,588,000
Earnings Per Share, Diluted $ 0.52 $ (0.11) $ 0.52 $ (0.35)
Stock Options [Member]
        
Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted EPS (in shares) 338,433 [2] 620,334 [2] 344,433 [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] 573,628 [2] 0 [2] 522,032 [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.