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Goodwill (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Dec. 29, 2012
Jun. 30, 2012
Jun. 29, 2013
item
Jun. 30, 2012
Dec. 31, 2011
Goodwill            
Number of reporting units       1    
Goodwill impairment $ 0 $ 71,400,000 $ 0      
Changes in the carrying amount of goodwill            
Balance at the beginning of the period, gross       142,658,000 141,153,000  
Goodwill adjustments related to acquisition       5,358,000    
Goodwill adjustments related to NeuCo       (63,000)    
Effect of foreign currency translation       (787,000) 377,000  
Balance at the end of the period, gross 147,166,000 142,658,000 141,530,000 147,166,000 141,530,000  
Accumulated impairment losses (71,893,000) (71,893,000) (499,000) (71,893,000) (499,000) (499,000)
Balance at the beginning of the period, net       70,765,000 140,654,000  
Balance at the end of the period, net $ 75,273,000 $ 70,765,000 $ 141,031,000 $ 75,273,000 $ 141,031,000