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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
Weighted-average number of common shares outstanding:        
Basic number of common shares outstanding (in shares) 103,295,920 89,620,394 103,275,204 82,630,430
Dilutive effect of options (in shares) 0 294,434 1,494,711 0
Dilutive effect of warrants (in shares) 0 1,000,977 1,684,860 823,405
Diluted number of common shares outstanding (in shares) 103,295,920 90,915,805 106,454,775 83,453,835
Basic net income (loss) per common share:        
Net income $ (5,997) $ 46,570 $ 65,074 $ 147,223
Net income allocated to participating shares 0 (322) (420) (1,099)
Net income (loss) available to common shareholders (5,997) 46,248 64,654 146,124
Basic net income (loss) per common share (in dollars per share) $ (0.06) $ 0.52 $ 0.63 $ 1.77
Diluted net income (loss) per common share:        
Net income (5,997) 46,570 65,074 147,223
Net income allocated to participating securities 0 (318) (408) (1,089)
Net income (loss) available to common shareholders $ (5,997) $ 46,252 $ 64,666 $ 146,134
Diluted net income (loss) per common share (in dollars per share) $ (0.06) $ 0.51 $ 0.61 $ 1.75
Employee stock option
        
Diluted net income (loss) per common share:        
Antidilutive securities excluded from computation of earnings per share 11,327,302 3,887,829 4,553,159 3,579,271
Warrant
        
Diluted net income (loss) per common share:        
Antidilutive securities excluded from computation of earnings per share 4,651,163