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Share-based compensation plans (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
item
Jun. 30, 2013
Share-based compensation plans        
Number of plans     2  
SARs
       
Share-based compensation plans        
Number of equivalent shares outstanding 282,750   282,750  
Number of shares granted     752,499  
Number of shares forfeited     27,500  
Vesting period     3 years  
Number of annual payments     3  
Vesting percentage     33.00%  
SARs expense $ 311,453 $ 113,750 $ 397,965 $ 113,750
Unrecognized compensation cost related to unvested SARs $ 2,356,016   $ 2,356,016