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Stock-Based Compensation (Summary of Unvested Stock Options) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares      
Unvested, beginning of period (in shares) 48,581    
Granted (in shares) 0 32,750 0
Vested (in shares) (26,549)    
Canceled/Forfeited (in shares) (1,167)    
Unvested, end of period (in shares) 20,865 48,581  
Weighted Average Grant Date Fair Value      
Unvested, beginning of period (in dollars per share) $ 11.41    
Granted (in dollars per share) 0 $ 11.93  
Vested (in dollars per share) 10.97    
Canceled/Forfeited (in dollars per share) 11.93    
Unvested, end of period (in dollars per share) $ 11.93 $ 11.41