Annual report pursuant to Section 13 and 15(d)

Property And Equipment (Details)

v2.4.0.6
Property And Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 111,019 $ 105,662  
Less accumulated depreciation and amortization 59,049 54,437  
Property and equipment, net 51,970 51,225  
Property and equipment, net 61,751 60,754  
Depreciation 7,717 7,431 7,510
Buildings [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 40 years    
Property and equipment, gross 40,766 40,173  
Laboratory and Production Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 22,366 21,083  
Sound and Video Library [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Property and equipment, gross 600 600  
Computer Equipment and Software [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 32,639 30,621  
Furniture and Fixtures [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 5,350 5,117  
Automobiles [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 285 294  
Leasehold Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 6,817 5,723  
Land Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 15 years    
Property and equipment, gross 2,196 2,051  
Land [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, net 8,211 8,109  
Deposits And Projects In Process [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, net $ 1,570 $ 1,420  
Minimum [Member] | Laboratory and Production Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Minimum [Member] | Computer Equipment and Software [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Minimum [Member] | Furniture and Fixtures [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Minimum [Member] | Automobiles [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Minimum [Member] | Leasehold Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Maximum [Member] | Laboratory and Production Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 7 years    
Maximum [Member] | Computer Equipment and Software [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Maximum [Member] | Furniture and Fixtures [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Maximum [Member] | Automobiles [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Maximum [Member] | Leasehold Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Useful life 5 years