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STOCKHOLDERS' EQUITY: - Compensation Plan (Details)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Jan. 31, 2015
$ / shares
Jan. 31, 2015
MXN / shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2010
$ / shares
Dec. 31, 2010
MXN / shares
Employee Stock Purchase 2007 Plan            
Stock award activity, Shares            
Outstanding shares at the beginning of the year | shares     109,241 4,298,612    
Exercised (in shares) | shares       (4,128,970)    
Outstanding shares at the end of the year | shares     109,241 169,642    
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the year (in dollars per share) | $ / shares     $ 1.16 $ 1.16    
Exercised (in dollars per share) | $ / shares       1.16    
Outstanding shares at the end of the year (in dollars per share) | $ / shares     $ 1.16 $ 1.16    
Employee Stock Purchase 2010 Plan            
Information related to compensation cost            
Stock based compensation expense | $     $ 0.3 $ 0.2    
Unrecognized compensation expense | $     $ 1.0 $ 1.9    
Period over which unrecognized compensation expense expected to be recognized     2 years 6 months      
Purchase price for initial subscription (in dollars per share) | (per share)         $ 2.05 MXN 26.51
Stock award activity, Shares            
Outstanding shares at the beginning of the year | shares     2,227,582 2,287,891    
Exercised (in shares) | shares     (605,371) (20,273)    
Outstanding shares at the end of the year | shares     1,622,211 2,267,618    
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the year (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 year (in dollars per share) | $ / shares     $ 2.05 $ 2.05    
Employee Stock Purchase 2015 Plan            
Information related to compensation cost            
Stock based compensation expense | $     $ 0.3      
Unrecognized compensation expense | $     $ 4.2 $ 4.8    
Purchase price for initial subscription (in dollars per share) | (per share) $ 2.63 MXN 38.44        
Stock award activity, Shares            
Outstanding shares at the beginning of the year | shares     2,656,386      
Granted (in shares) | shares       2,656,386    
Exercised (in shares) | shares     (13,997)      
Outstanding shares at the end of the year | shares     2,642,389 2,656,386    
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the year (in dollars per share) | $ / shares     $ 2.63      
Granted (in dollars per share) | $ / shares       $ 2.63    
Exercised (in dollars per share) | $ / shares     2.63      
Outstanding shares at the end of the year (in dollars per share) | $ / shares     $ 2.63 $ 2.63