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Stock-Based Compensation (Schedule Of Stock Option Activity) (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options Outstanding, Outstanding, Beginning of period, shares | shares 547,625
Options Outstanding, Granted, shares | shares 77,900
Options Outstanding, Exercised, shares | shares (57,000)
Options Outstanding, Expired, shares | shares 0
Options Outstanding, Forfeited, shares | shares 0
Options Outstanding, Outstanding, End of period, shares | shares 568,525
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted-Average Exercise Price Per Share, Outstanding, Beginning of period (in usd per share) | $ / shares $ 9.39
Weighted-Average Exercise Price Per Share, Granted (in usd per share) | $ / shares 15.40
Weighted-Average Exercise Price Per Share, Exercised (in usd per share) | $ / shares 9.18
Weighted-Average Exercise Price Per Share, Expired (in usd per share) | $ / shares 0
Weighted-Average Exercise Price Per Share, Forfeited (in usd per share) | $ / shares 0
Weighted-Average Exercise Price Per Share, Outstanding, End of period (in usd per share) | $ / shares $ 10.24
Options Outstanding, Exercisable, End of period, shares | shares 308,063
Weighted-Average Exercise Price Per Share, Exercisable, End of period (in usd per share) | $ / shares $ 8.66