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Fair Value Measurements (Details) (USD $)
Sep. 29, 2012
Dec. 31, 2011
Marketable debt securities - current    
Marketable debt securities - current $ 47,232,000 $ 20,020,000
Marketable debt securities - non-current    
Marketable debt securities - non-current 35,518,000 10,042,000
Marketable debt securities 82,750,000 30,062,000
Deferred Compensation Liability, Classified, Noncurrent 1,700,000 1,300,000
Level 1 [Member]
   
Marketable debt securities - non-current    
Marketable securities assets funding the deferred compensation plan 1,700,000 1,300,000
Recurring [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 20,023,000 20,020,000
Corporate bonds 16,518,000  
U.S. Agency bonds 7,619,000  
Municipal Bonds Current 3,072,000  
Marketable debt securities - current 47,232,000 20,020,000
Marketable debt securities - non-current    
U.S. Treasury securities 15,027,000 10,042,000
Corporate bonds 10,360,000  
U.S. Agency bonds 7,512,000  
Municipal bonds 2,619,000  
Marketable debt securities - non-current 35,518,000 10,042,000
Marketable debt securities 82,750,000 30,062,000
Recurring [Member] | Level 1 [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 20,023,000 20,020,000
Corporate bonds 0  
U.S. Agency bonds 0  
Municipal Bonds Current 0  
Marketable debt securities - current 20,023,000 20,020,000
Marketable debt securities - non-current    
U.S. Treasury securities 15,027,000 10,042,000
Corporate bonds 0  
U.S. Agency bonds 0  
Municipal bonds 0  
Marketable debt securities - non-current 15,027,000 10,042,000
Marketable debt securities 35,050,000 30,062,000
Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 0 0
Corporate bonds 16,518,000  
U.S. Agency bonds 7,619,000  
Municipal Bonds Current 3,072,000  
Marketable debt securities - current 27,209,000 0
Marketable debt securities - non-current    
U.S. Treasury securities 0 0
Corporate bonds 10,360,000  
U.S. Agency bonds 7,512,000  
Municipal bonds 2,619,000  
Marketable debt securities - non-current 20,491,000 0
Marketable debt securities 47,700,000 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 0 0
Corporate bonds 0  
U.S. Agency bonds 0  
Municipal Bonds Current 0  
Marketable debt securities - current 0 0
Marketable debt securities - non-current    
U.S. Treasury securities 0 0
Corporate bonds 0  
U.S. Agency bonds 0  
Municipal bonds 0  
Marketable debt securities - non-current 0 0
Marketable debt securities $ 0 $ 0