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WARRANTY OBLIGATIONS AND OTHER GUARANTEES (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
WARRANTY OBLIGATIONS AND OTHER GUARANTEES      
Standard product warranty term, minimum 1 year    
Standard product warranty term, maximum 2 years    
Limited warranty services term, minimum 2 years    
Warranty expirations recorded as a reduction of cost of net sales $ 300,000 $ 1,400,000  
Activity related to warranty obligations      
Balance at the beginning of the period 4,660,000 7,734,000 16,150,000
Accruals for warranties issued during the period (benifit from expirations), net 2,039,000 (191,000) (3,103,000)
Warranty reserve derecognized upon IPTV divestiture (2,507,000)    
Settlements made during the period (2,863,000) (2,883,000) (5,313,000)
Balance at the end of the period $ 1,329,000 $ 4,660,000 $ 7,734,000