Shareholders' Equity and Stock Compensation (Summary Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, balance, beginning of period (in shares) | shares	98
Options outstanding, exercised (in shares) | shares	(65)
Options outstanding, balance, end of period (in shares) | shares	33
Options exercisable, end of period, options outstanding (in shares) | shares	33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted avg exercise price, balance beginning of period (in usd per share) | $ / shares	$ 11.99
Weighted-avg exercise price, exercised (in usd per share) | $ / shares	11.73
Weighted avg exercise price, balance, end of period (in usd per share) | $ / shares	12.49
Options exercisable, end of period, weighted avg. exercise price (in usd per share) | $ / shares	$ 12.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, weighted avg remaining contractual term	3 years 2 months 9 days
Options exercisable, end of period, weighted-avg remaining contractual term	3 years 2 months 9 days
Options outstanding, aggregate intrinsic value | $	$ 297
Options exercisable, end of period, aggregate intrinsic value | $	$ 297