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Share-based compensation - Schedule of restricted share award activity (Details) (Restricted share awards, USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Restricted share awards
   
Number of non-vested restricted shares (in shares)    
Outstanding (in shares) 657,156.000 619,300
Granted (in shares) 9,614 37,856
Forfeited (in shares) 0 0
Vested (in shares) 0 0
Outstanding (in shares) 666,770.00 657,156.000
Weighted average grant data fair value (in dollars per share)    
Outstanding (in dollars per share) $ 10.25 $ 10.00
Granted (in dollars per share) $ 15.29 $ 15.22
Forfeited (in dollars per share) $ 0.00 $ 0.00
Vested (in dollars per share) $ 0.00 $ 0.00
Outstanding (in dollars per share) $ 10.37 $ 10.25