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Stock-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Stock-Based Compensation [Abstract]    
Options, Outstanding, beginning of period 212,725  
Options, Granted 0  
Options, Exercised (12,650)  
Options, Forfeited (750)  
Options, Outstanding, end of period 199,325 212,725
Options, Exercisable, end of period 165,325  
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 18.41  
Weighted Average Exercise Price Per Share, Forfeited 32.81  
Weighted Average Exercise Price Per Share, Outstanding, end of period 20.86 $ 20.76
Weighted Average Exercise Price Per Share, Exercisable, end of period $ 18.41  
Weighted Average Remaining Contractual Term, Outstanding 5 years 7 months 6 days 6 years 1 month 6 days
Weighted Average Remaining Contractual Term, Exercised During Period 4 years 9 months 18 days  
Weighted Average Remaining Contractual Term, Forfeited During Period 9 years 6 months  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 4 years 9 months 18 days  
Aggregate Intrinsic Value, Outstanding, beginning of period $ 2,604  
Aggregate Intrinsic Value, Granted in Period 0  
Aggregate Intrinsic Value, Exercised in Period 160  
Aggregate Intrinsic Value, Forfeited in Period 25  
Aggregate Intrinsic Value, Outstanding, end of period 1,932 $ 2,604
Aggregate Intrinsic Value, Exercisable at end of period $ 1,932