Discontinued Operations (Summary Of Results Of Discontinued Operations) (Details) - Cardiac Diagnostic Monitoring Business [Member] - Discontinued Operations, Disposed of by Sale [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Sales, net	$ 445	$ 140	$ 987
Operating costs and expenses	(639)	(268)	(1,746)
Net loss from discontinued operations	$ (194)	$ (128)	$ (759)