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Investment In Partnerships (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 item	Sep. 30, 2011
Schedule of Equity Method Investments [Line Items]
Gain on sale of investment in partnership	$ 822		$ 822
Hearing Instrument Manufacturers Patent Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	9.00%		9.00%
Number of patents			45
Increases (decrease) in carrying amount of investment	(39)	(37)	(127)	(31)
Global Coils [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%		50.00%
Increases (decrease) in carrying amount of investment		25	50	348
Cash payment received on sale of ownsership interest	426
Gain on sale of investment in partnership	$ 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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