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Stock-based Compensation (Details 2) (Stock Options, USD $)
 3 Months Ended
Mar. 31, 2014
Stock Options
  
Shares  
Outstanding at beginning of period (in shares) 11,417
Exercised (in shares) (2,083)
Forfeited (in shares) (1,666)
Outstanding at end of period (in shares) 7,668
Exercisable at end of period (in shares) 2,083
Weighted Average Exercise Price  
Outstanding at beginning of period (in dollars per share) $ 8.87
Exercised (in dollars per share) $ 6.26
Forfeited (in dollars per share) $ 7.77
Outstanding at end of period (in dollars per share) $ 9.82
Exercisable at end of period (in dollars per share) $ 6.87
Aggregate intrinsic value of all options outstanding $ 75,800
Aggregate intrinsic value of all options exercisable $ 26,700