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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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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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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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Amount of gain (loss) on sale or disposal of an equity method investment.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

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Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Investment In Partnerships (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2012
Schedule of Equity Method Investments [Line Items]
Final principal installment paid			$ 240iin_PaymentForEquityMethodInvestments
Operating expenses	15,076us-gaap_OperatingExpenses	13,507us-gaap_OperatingExpenses	13,231us-gaap_OperatingExpenses
Proceeds from sale of Global Coils			426
Gain on sale of investment in partnership			822
Hearing Instrument Manufacturers Patent Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Purchase price	1,800
Ownership interest	9.00%
Number of patents	45
Acquired finite-lived intangible assets	1,475
Increase (decrease) in carrying amount of investment	(182)	(204)	(166)
Operating expenses	46	58	50
Carrying amount of partnership	387	569
Remaining amount to amortize, 2014	195
Remaining amount to amortize, 2015	195
Remaining amount to amortize, 2016	195
Global Coils [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest				50.00%
Increase (decrease) in carrying amount of investment	50
Proceeds from sale of Global Coils	426
Gain on sale of investment in partnership	822
Patents [Member] \| Hearing Instrument Manufacturers Patent Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Acquired finite-lived intangible assets	345
Acquired finite-lived intangible assets amortization period	10 years
Non-Exclusive Patents [Member] \| Hearing Instrument Manufacturers Patent Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Acquired finite-lived intangible assets	$ 1,130