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Discontinued Operations (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 27, 2014
Jun. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Discontinued Operations [Line Items]        
Proceeds from sale of business $ 500   $ 500  
Loss on sale of discontinued operations (120)   (120)  
Impairment charge   983   717
Microphone And Receiver Businesses [Member]
       
Discontinued Operations [Line Items]        
Proceeds from sale of business $ 500