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Investment In Partnerships (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		1 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013 Hearing Instrument Manufacturers Patent Partnership [Member]	Sep. 30, 2012 Hearing Instrument Manufacturers Patent Partnership [Member]	Sep. 30, 2013 Hearing Instrument Manufacturers Patent Partnership [Member] item	Sep. 30, 2012 Hearing Instrument Manufacturers Patent Partnership [Member]	Aug. 31, 2012 Global Coils [Member]	Sep. 30, 2012 Global Coils [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest			9.00%		9.00%		50.00%
Number of patents					45
Increases (decrease) in carrying amount of investment			$ (49)	$ (39)	$ (184)	$ (127)		$ 50
Cash payment received on sale of ownership interest							426
Gain on sale of investment in partnership	$ 822	$ 822					$ 822

The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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