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STOCKHOLDERS' EQUITY: (Details 4)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
MXN / shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
shares
Dec. 31, 2010
$ / shares
Dec. 31, 2010
MXN / shares
Stock award activity, Shares          
Granted (in shares)   13,200 12,000    
Employee Stock Purchase 2007 Plan          
Information related to compensation cost          
Stock based compensation expense | $     $ 1.6    
Unrecognized compensation expense | $     $ 0.5    
Stock award activity, Shares          
Outstanding shares at the beginning of the period   4,298,612 4,449,599    
Exercised (in shares)   (4,189,371) (140,545)    
Outstanding shares at the end of the period   109,241 4,309,054    
Unit Weighted Average Grant Date Fair Value          
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares   $ 1.16 $ 1.16    
Exercised (in dollars per share) | $ / shares   1.16 1.16    
Outstanding shares at the end of the period (in dollars per share) | $ / shares   $ 1.16 $ 1.16    
Employee Stock Purchase 2010 Plan          
Information related to compensation cost          
Stock based compensation expense | $   $ 0.4 $ 0.4    
Unrecognized compensation expense | $ $ 1.7 $ 1.7 $ 2.2    
Period over which unrecognized compensation expense expected to be recognized   3 years 3 months 18 days      
Stock award activity, Shares          
Outstanding shares at the beginning of the period   2,287,891 3,012,464    
Exercised (in shares)   (60,309) (724,573)    
Outstanding shares at the end of the period   2,227,582 2,287,891    
Unit Weighted Average Grant Date Fair Value          
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares   $ 2.05 $ 2.05    
Exercised (in dollars per share) | $ / shares   2.05 2.05    
Outstanding shares at the end of the period (in dollars per share) | $ / shares   $ 2.05 $ 2.05    
Purchase price for initial subscription (in dollars per share) | (per share)       $ 2.05 MXN 26.51
Employee Stock Purchase 2015 Plan          
Information related to compensation cost          
Stock based compensation expense | $   $ 0.2      
Unrecognized compensation expense | $ $ 4.6 $ 4.6      
Stock award activity, Shares          
Granted (in shares)   2,652,886      
Outstanding shares at the end of the period   2,652,886      
Unit Weighted Average Grant Date Fair Value          
Granted (in dollars per share) | $ / shares   $ 2.63      
Outstanding shares at the end of the period (in dollars per share) | $ / shares   2.63      
Purchase price for initial subscription (in dollars per share) | (per share) $ 38.44 $ 2.63