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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
Weighted-average number of common shares outstanding:        
Basic number of common shares outstanding (in shares) 103,264,616 78,432,132 103,264,616 78,432,132
Dilutive effect of options (in shares) 1,490,091 22,216 1,520,726 0
Dilutive effect of warrants (in shares) 1,679,174 799,920 1,720,373 715,840
Diluted number of common shares outstanding (in shares) 106,433,881 79,254,268 106,505,715 79,147,972
Basic net income per common share:        
Net income $ 31,292 $ 26,223 $ 71,071 $ 100,653
Net income allocated to participating shares (200) (206) (452) (790)
Net income available to common shareholders 31,092 26,017 70,619 99,863
Basic net income (loss) per common share (in dollars per share) $ 0.30 $ 0.33 $ 0.68 $ 1.27
Diluted net income per common share:        
Net income 31,292 26,223 71,071 100,653
Income allocated to participating securities (194) (204) (439) (783)
Net income available to common shareholders $ 31,098 $ 26,019 $ 70,632 $ 99,870
Diluted net income (loss) per common share (in dollars per share) $ 0.29 $ 0.33 $ 0.66 $ 1.26
Options and Warrants [Member]
        
Diluted net income per common share:        
Antidilutive securities excluded from computation of earnings per share 4,531,962 3,462,938 4,489,327 3,423,925