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Stock-Based Compensation - Summary Of Restricted Stock Awards (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Shares    
Granted (shares) 254,534  
Restricted Stock Awards    
Shares    
Unvested, beginning balance (shares) 286,068 394,697
Granted (shares)   20,770
Vested (shares) (111,024) (121,899)
Forfeited (shares) (6,667) (7,500)
Unvested, ending balance (shares) 422,911 286,068
Weighted Average Share Price    
Unvested, beginning balance (usd per share) $ 12.63 $ 12.56
Granted (usd per share) 15.46 13.13
Vested (usd per share) 12.82 12.60
Forfeited (usd per share) 15.21 10.87
Unvested, ending balance (usd per share) $ 14.19 $ 12.63