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Shareholders' equity (Tables)
6 Months Ended
Jun. 30, 2012
Shareholders' equity (Abstract)  
Shareholders' equity
  Number of non vested shares Weighted average grant date fair value per non vested shares
Balance as at January 1, 2012  -  -
Granted  145,650  16.37
Forfeited  (3,000)  16.50
Balance as at June 30, 2012  142,650 $ 16.37