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Description of Business (Sale of Fiber Optics-related Assets) (Details) - USD ($)
$ in Thousands
May. 07, 2012
Dec. 31, 2015
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Deferred gain associated with sale of assets   $ 3,400 $ 3,400
Sumitomo Electric Industries, LTD [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of assets $ 2,800    
Indemnification associated with sale of assets $ 3,400    
Indemnification period 2 years    
Cash held in escrow   1,900  
Sumitomo Electric Industries, LTD [Member] | Indemnification Obligation [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Deferred gain associated with sale of assets   $ 3,400