Discontinued Operations (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Loss on sale of discontinued operations, net of income taxes	$ 164
Cardiac Diagnostic Monitoring Business [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Loss on impairment		$ 796

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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