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Share-based compensation plans (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
item
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Share-based compensation plans            
Number of plans     2   2  
SARs
           
Share-based compensation plans            
Number of equivalent shares outstanding 5,655,000   5,655,000      
Number of shares granted     1,504,998   4,700,000  
Number of shares forfeited     550,000      
Vesting period     3 years   3 years  
Number of annual payments     3      
Vesting percentage     33.00%      
SARs expense $ 311,453 $ 113,750 $ 397,965 $ 113,750 $ 339,661 $ 0
Unrecognized compensation cost related to unvested SARs $ 2,356,016   $ 2,356,016   $ 1,534,689