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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Sales, net		$ 348	$ 140	$ 542
Operating costs and expenses	$ (15)	(613)	(268)	(1,107)
Net loss from discontinued operations	$ (15)	$ (265)	$ (128)	$ (565)