Shareholders' Equity and Stock Compensation (Summary Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2017 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	219
Options outstanding, granted (in shares) | shares	0
Options outstanding, exercised (in shares) | shares	(42)
Options outstanding, forfeited/expired (in shares) | shares	(50)
Options outstanding, balance, end of period (in shares) | shares	127
Options exercisable, end of period, options outstanding (in shares) | shares	123
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	$ 15.74
Weighted-avg exercise price, granted (in usd per share) | $ / shares	0.00
Weighted-avg exercise price, exercised (in usd per share) | $ / shares	13.20
Weighted-avg exercise price, forfeited/expired (in usd per share) | $ / shares	26.12
Weighted avg exercise price, balance, end of period (in usd per share) | $ / shares	12.48
Options exercisable, end of period, weighted avg. exercise price (in usd per share) | $ / shares	$ 12.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, weighted avg remaining contractual term	2 years 7 months 15 days
Options exercisable, end of period, weighted-avg remaining contractual term	2 years 6 months 16 days
Options outstanding, aggregate intrinsic value | $	$ 894
Options exercisable, end of period, aggregate intrinsic value | $	$ 864