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Stock award plan (Details 2) - Unvested restricted stock
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Number of Shares  
Balance at the beginning of the period (in shares) | shares 718,400
Vested (in shares) | shares (361,919)
Forfeited (in shares) | shares (3,346)
Balance at the end of the period (in shares) | shares 353,135
Weighted Average Grant Date Fair Value  
Balance at the beginning of the period (in dollars per share) $ 10.72
Vested (in dollars per share) 10.60
Forfeited (in dollars per share) 10.82
Balance at the end of the period (in dollars per share) $ 10.85