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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ in Thousands
 4 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
item
Dec. 31, 2012
USD ($)
Aug. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Cash and cash equivalents $ 179,584 $ 77,050 $ 77,824 $ 107,773 $ 179,584    
Short-term restricted cash   12,264 13,731        
Long-term restricted cash   3,800 3,400        
Deferred revenue   0 11,700 10,200      
Revenues relating to unassigned contracts   117,103 129,420 164,439      
Current deferred revenue   16,965 26,819        
Long-term deferred revenue   $ 8,554 18,304        
Warranty accrual reversals   100 100      
Depreciation expense   $ 2,300 2,900 5,400      
Investment impairment   9,846 3,947 9,400      
Advertising costs   100 100 100      
Less: Gain (loss) reclassified from AOCI to income     (121) $ 7,088      
Number of chinese entities | item       2      
Gain (loss) on foreign currency translation   $ 190 (586) $ 3,856      
Minimum [Member]              
Warranty period   1 year          
Period after sales to provide limited warranty services   2 years          
Maximum [Member]              
Warranty period   2 years          
IPTV divestiture [Member]              
Deferred revenue 5,100       5,100 $ 10,000  
Liabilities and deferred costs related to un-assigned contracts   $ 11,600       $ 47,300  
Revenues relating to unassigned contracts $ 2,200 $ 3,600 4,300 $ 1,400      
PAS Infrastructure Contracts [Member]              
Deferred revenue             $ 13,200
Deferred revenue released         $ 8,100    
Subsidiaries [Member] | United States [Member]              
Cash and cash equivalents (as a percent)   17.00%          
Cash and cash equivalents   $ 12,900          
Subsidiaries [Member] | CHINA [Member]              
Cash and cash equivalents (as a percent)   26.00%          
Cash and cash equivalents   $ 19,800 $ 14,500