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Stock-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Stock-Based Compensation [Abstract]    
Options, Outstanding, beginning of period 212,725  
Options, Granted 0  
Options, Exercised (20,775)  
Options, Forfeited (1,500)  
Options, Outstanding, end of period 190,450 212,725
Options, Exercisable, end of period 157,200  
Weighted Average Exercise Price Per Share, Outstanding, beginning of period $ 20.76  
Weighted Average Exercise Price Per Share, Granted  
Weighted Average Exercise Price Per Share, Exercised 19.01  
Weighted Average Exercise Price Per Share, Forfeited 32.81  
Weighted Average Exercise Price Per Share, Outstanding, end of period 20.85 $ 20.76
Weighted Average Exercise Price Per Share, Exercisable, end of period $ 18.33  
Weighted Average Remaining Contractual Term, Outstanding 5 years 3 months 18 days 6 years 1 month 6 days
Weighted Average Remaining Contractual Term, Exercised During Period 5 years 4 months 24 days  
Weighted Average Remaining Contractual Term, Forfeited During Period 9 years 2 months 12 days  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 4 years 6 months  
Aggregate Intrinsic Value, Outstanding, beginning of period $ 2,604  
Aggregate Intrinsic Value, Granted in Period 0  
Aggregate Intrinsic Value, Exercised in Period 395  
Aggregate Intrinsic Value, Forfeited in Period 49  
Aggregate Intrinsic Value, Outstanding, end of period 3,972 $ 2,604
Aggregate Intrinsic Value, Exercisable at end of period $ 2,881