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Discontinued Operations (Details) (USD $)
 1 Months Ended 12 Months Ended
Jan. 31, 2013
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Jan. 16, 2013
Assets          
Total current assets held for sale   $ 21,573,729 $ 0    
Total noncurrent assets held for sale   29,145,732 0    
Liabilities          
Total current liabilities held for sale   7,102,895 0    
Total noncurrent liabilities held for sale   623,979 0    
III-V product line including all outstanding equity interest in KTC Wireless, LLC
          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Aggregate purchase price         75,000,000
Proceeds received from divestiture 55,000,000        
Consideration held in Escrow         5,000,000
Consideration to be paid on the third anniversary of the Closing Date         15,000,000
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]          
Net sales and other operating revenues   58,800,000 66,500,000 62,200,000  
Income from operations before income taxes   4,500,000 5,900,000 7,600,000  
Provision for income taxes on operations   (1,700,000) 3,800,000 (300,000)  
Income from operations, net of tax   2,800,000 9,700,000 7,300,000  
Assets          
Cash and equivalents   2,400,000      
Accounts receivable, net of allowance of $0.1 million   7,600,000      
Allowance for doubtful accounts receivable   100,000      
Accounts receivable from unconsolidated affiliates   600,000      
Inventory   10,600,000      
Prepaid taxes   200,000      
Prepaid expenses and other current assets   200,000      
Total current assets held for sale   21,600,000      
Property, plant and equipment, net   25,700,000      
Deferred tax assets   3,300,000      
Other assets   100,000      
Total noncurrent assets held for sale   29,100,000      
Total assets held for sale   50,700,000      
Liabilities          
Accounts payable   3,700,000      
Accrued payroll and expenses   1,800,000      
Accrued warranty   200,000      
Other accrued liabilities   1,400,000      
Total current liabilities held for sale   7,100,000      
Total noncurrent liabilities held for sale   $ 600,000