Stock-Based Compensation Plan (Schedule Of Shares Authorized Under Stock Option Plans, By Exercise Price Range) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options \| shares	2,097
Exercisable options \| shares	1,826
Exercisable options, remaining life in years	5 years 8 months 12 days
Exercisable options, weighted average exercise price	$ 8.44
$4.00 - $4.72 Exercise Price Range [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower limit	4.00
Exercise price, upper limit	$ 4.72
Outstanding options \| shares	275
Exercisable options \| shares	86
Exercisable options, remaining life in years	8 years 2 months 12 days
Exercisable options, weighted average exercise price	$ 4.31
$4.72 - $13.38 Exercise Price Range [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower limit	4.72
Exercise price, upper limit	$ 13.38
Outstanding options \| shares	1,822
Exercisable options \| shares	1,740
Exercisable options, remaining life in years	5 years 6 months
Exercisable options, weighted average exercise price	$ 8.65