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THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Short-term investments      
Minimum stated maturity period 1 year    
Restricted cash and deposits      
Tenant's security deposits 0.7 1.9  
Security deposits in banks 2.6 2.6  
Number of banks under foreign exchange management agreement 2    
Interest rate on restricted deposits (as a percent) 1.50%    
Revenues | Consolidated revenue | Hewlett-Packard
     
Concentration of credit risk      
Percentage of consolidated revenue by major customer 20.00% 19.00% 15.00%
Revenues | Consolidated revenue | IBM
     
Concentration of credit risk      
Percentage of consolidated revenue by major customer 19.00% 17.00% 10.00%
Revenues | Consolidated revenue | IBM | Maximum
     
Concentration of credit risk      
Percentage of consolidated revenue by major customer     10.00%
Revenues | Consolidated revenue | Dell
     
Concentration of credit risk      
Percentage of consolidated revenue by major customer 10.00% 10.00% 12.00%
Revenues | Consolidated revenue | Dell | Maximum
     
Concentration of credit risk      
Percentage of consolidated revenue by major customer 10.00% 10.00%  
Accounts receivable | Consolidated revenue | Hewlett-Packard
     
Concentration of credit risk      
Percentage required for qualification as major customer   17.00%  
Accounts receivable | Consolidated revenue | Hewlett-Packard | Maximum
     
Concentration of credit risk      
Percentage required for qualification as major customer 10.00%    
Accounts receivable | Consolidated revenue | IBM
     
Concentration of credit risk      
Percentage required for qualification as major customer 21.00% 18.00%