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COMMITMENTS AND CONTINGENCIES - Guarantees (Details)
Sep. 28, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 28, 2014
Financial Standby Letter of Credit
USD ($)
Sep. 28, 2014
Vortek Industries
Sep. 28, 2014
Vortek Industries
Royalty Agreements
USD ($)
Sep. 28, 2014
Vortek Industries
Royalty Agreements
CAD
Guarantor Obligations [Line Items]            
Total amount of outstanding standby letters of credit     $ 1,900,000      
Restricted cash 2,001,000 2,087,000        
Royalty guarantees payments, percentage of net sales from certain Flash RTP products       1.40%    
Potential cash payment to Canadian Minister of Industries from certain Flash RTP products in connection with acquisition of Vortek Industries, Ltd.         $ 12,800,000 14,300,000