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Stock award plan (Details 2) - 6 months ended Jun. 30, 2015 - Unvested restricted stock - $ / shares
Total
Number of Shares  
Balance at the beginning of the period (in shares) 718,400
Vested (in shares) (361,919)
Forfeited (in shares) (3,346)
Balance at the end of the period (in 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