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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
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 shares awarded     1,504,998   4,700,000  
Vesting period     3 years   3 years  
Contractual term         5 years  
Share-based compensation expense $ 311,453 $ 113,750 $ 397,965 $ 113,750 $ 339,661 $ 0
Unrecognized compensation cost related to unvested share-based compensation $ 2,356,016   $ 2,356,016   $ 1,534,689  
Period of recognizing unrecognized compensation cost related to unvested share-based compensation         3 years