Common Stock And Stock Options (Summary Of Stock Option Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Common Stock And Stock Options [Abstract]
Number of Shares, Outstanding	1,313	1,407	1,244
Number of Shares, Options forfeited or cancelled		(63)	(15)
Number of Shares, Options granted	170	174	192
Number of Shares, Options exercised	(159)	(205)	(14)
Number of Shares, Outstanding	1,324	1,313	1,407
Weighted-average Exercise Price, Outstanding	$ 5.86	$ 5.75	$ 5.97
Weighted-average Exercise Price, Options forfeited or cancelled		7.87	5.21
Weighted-average Exercise Price, Options granted	7.14	4.99	4.06
Weighted-average Exercise Price, Options exercised	3.12	3.74	2.86
Weighted-average Exercise Price, Outstanding	$ 6.36	$ 5.86	$ 5.75
Aggregate Intrinsic Value, Outstanding	$ 2,640
Number of Shares, Exercisable	989	984
Weighted-average Exercise Price, Exercisable	$ 6.50	$ 6.17
Aggregate Intrinsic Value, Exercisable	$ 2,076	$ 1,830
Number of Shares, Available for future grant	490