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STOCKHOLDERS' EQUITY: (Details 4)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Employee stock purchase plan
USD ($)
Jun. 30, 2010
Employee stock purchase plan
USD ($)
Jun. 30, 2011
New Employee Stock Purchase Plan
USD ($)
Dec. 31, 2010
New Employee Stock Purchase Plan
USD ($)
Dec. 31, 2010
New Employee Stock Purchase Plan
MXN
Information related to compensation cost          
Stock based compensation expenses $ 1.1 $ 1.1 $ 0.3    
Unrecognized compensation expenses $ 7.4 $ 9.5 $ 4.0    
Period over which unrecognized compensation expense expected to be recognized (in years) 3.5   7.5    
Stock award activity, Shares          
Outstanding shares at the beginning of the period (in shares) 10,920,693 11,556,625 3,901,901    
Exercised (in shares) (3,338,992)        
Forfeited (in shares) (128,986) (558,297)      
Outstanding shares at the end of the period (in shares) 7,452,715 10,998,328 3,901,901 3,901,901 3,901,901
Unit Weighted Average Grant Date Fair Value          
Outstanding shares at the beginning of the period (in dollars per share) $ 1.16 $ 1.16 $ 2.05    
Exercised (in dollars per share) $ 1.16 $ 1.16      
Forfeited (in dollars per share) $ 1.16 $ 1.16      
Outstanding shares at the end of the period (in dollars per share) $ 1.16 $ 1.16 $ 2.05 $ 2.05  
Purchase price for initial subscription       $ 2.05 26.51