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Restructuring (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Restructuring Reserve [Roll Forward]        
Beginning balance $ 0 $ 0    
Charges 1,715 1,740 1,715 1,740
Cash Payments (432) 0    
Non-cash items   (896)    
Ending balance 1,283 1,740 1,283 1,740
Employee severance and benefits [Member]
       
Restructuring Reserve [Roll Forward]        
Beginning balance 0 0    
Charges 560 1,740    
Cash Payments (152) 0    
Non-cash items   (896)    
Ending balance 408 844 408 844
Facility termination costs [Member]
       
Restructuring Reserve [Roll Forward]        
Beginning balance 0 0    
Charges 846 0    
Cash Payments 0 0    
Non-cash items   0    
Ending balance 846 0 846 0
Other [Member]
       
Restructuring Reserve [Roll Forward]        
Beginning balance 0 0    
Charges 309 0    
Cash Payments (280) 0    
Non-cash items   0    
Ending balance $ 29 $ 0 $ 29 $ 0