Accounting For Stock-Based Compensation (Schedule Of Stock Option Activity) (Details)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, Outstanding, December 31, 2016 (in shares) | shares	547,625
Options Outstanding, Granted (in shares) | shares	0
Options Outstanding, Exercised (in shares) | shares	(40,750)
Options Outstanding, Expired (in shares) | shares	0
Options Outstanding, Forfeited (in shares) | shares	0
Options Outstanding, Outstanding, June 30, 2017 (in shares) | shares	506,875
Options Outstanding, Exercisable, June 30, 2017 (in shares) | shares	246,313
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price Per Share, Outstanding, December 31, 2016 (in dollars per share) | $ / shares	$ 9.39
Weighted-Average Exercise Price Per Share, Granted (in dollars per share) | $ / shares	0
Weighted-Average Exercise Price Per Share, Exercised (in dollars per share) | $ / shares	9.31
Weighted-Average Exercise Price Per Share, Expired (in dollars per share) | $ / shares	0
Weighted-Average Exercise Price Per Share, Forfeited (in dollars per share) | $ / shares	0
Weighted-Average Exercise Price Per Share, Outstanding, June 30, 2017 (in dollars per share) | $ / shares	9.40
Weighted-Average Exercise Price Per Share, Exercisable, June 30, 2017 (in dollars per share) | $ / shares	$ 8.27