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INCOME TAXES (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
United States and foreign income (loss) before income taxes and minority interest      
Income (loss) before income taxes $ (33,187,000) $ 14,695,000 $ (62,175,000)
Gross U.S. deferred income tax liability on undistributed foreign earnings   36,000  
Current      
Federal   17,000 335,000
State (40,000) 217,000 (9,000)
Foreign 4,643,000 2,339,000 3,554,000
Total Current 4,603,000 2,573,000 3,880,000
Deferred      
Foreign (2,211,000) 345,000 (765,000)
Total Deferred (2,211,000) 345,000 (765,000)
Total 2,392,000 2,918,000 3,115,000
Unrecognized tax benefits      
Unrecognized tax benefits related to deferred tax assets and federal tax benefit of state income tax items 41,700,000    
Interest and penalties recognized in the statement of income 400,000    
Accrued interest and penalties 3,800,000 3,900,000  
Unrecognized tax benefits      
Beginning balance-gross unrecognized tax benefits (UTB's) 55,650,000 56,513,000 90,597,000
Additions based on tax positions related to the current year 80,000 121,000 2,063,000
Reductions based on tax positions related to the current year     (31,222,000)
Additions for tax positions related to prior years   176,000 352,000
Reductions for tax positions related to prior years (1,288,000) (1,160,000) (3,877,000)
Lapse of statute of limitations (430,000)   (1,400,000)
Ending balance-gross unrecognized tax benefits (UTB's) 54,012,000 55,650,000 56,513,000
UTB's as a credit in deferred taxes (39,402,000) (39,758,000) (39,758,000)
Federal benefit of state taxes (2,312,000) (2,338,000) (2,388,000)
UTB's that would impact the effective tax rate 12,298,000 13,554,000 14,417,000
Deferred Tax Assets      
Allowances and reserves 16,743,000 39,915,000  
Deferred revenue and customer advances, net 3,349,000 8,222,000  
Net operating loss carryforward 218,158,000 238,934,000  
Tax credit carryforwards 103,910,000 106,243,000  
Capital loss carryforwards 18,785,000 19,282,000  
Writedown/amortization of intangible assets and goodwill 19,642,000 26,061,000  
Fixed assets 7,500,000 6,804,000  
Demo equipment income 7,308,000 7,463,000  
Accrued warranties 66,000 780,000  
Other 26,404,000 23,675,000  
Total Deferred Tax Assets 421,865,000 477,379,000  
Deferred Tax Liabilities      
Prepaid expense (155,000) (86,000)  
Deferred taxes on unremitted earnings of subsidiaries   (36,000)  
Intangibles   (877,000)  
Other   (6,369,000)  
Total Deferred Tax Liabilities (155,000) (7,368,000)  
Total Deferred Tax Assets (Liabilities) 421,710,000 470,011,000  
Less: Valuation Allowance (418,285,000) (469,224,000)  
Total Deferred Tax Assets (Liabilities) 3,425,000 787,000  
Undistributed earnings of foreign subsidiaries permanently reinvested outside the United States 24,400,000    
United States
      
United States and foreign income (loss) before income taxes and minority interest      
Income (loss) before income taxes 13,061,000 18,671,000 (44,144,000)
Gross U.S. deferred income tax liability on undistributed foreign earnings 0    
Deferred Tax Liabilities      
Deferred taxes on unremitted earnings of subsidiaries 0    
Foreign
      
United States and foreign income (loss) before income taxes and minority interest      
Income (loss) before income taxes $ (45,013,000) $ (3,976,000) $ (18,031,000)