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STOCKHOLDERS' EQUITY: (Details 4)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
MXN / shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2010
$ / shares
Dec. 31, 2010
MXN / shares
Non-controlling interest activity          
Balance at the beginning of the period   $ 36.3      
Net earnings   0.6 $ 1.3    
Dividend paid     $ (0.2)    
Balance at the end of the period   $ 36.9      
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     (3,660,945)    
Outstanding shares at the end of the year | shares   109,241 637,667    
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   $ 0.1 $ 0.1    
Unrecognized compensation expense $ 1.3 $ 1.3 $ 2.0    
Period over which unrecognized compensation expense expected to be recognized   2 years 9 months      
Stock award activity, Shares          
Outstanding shares at the beginning of the year | shares   2,227,582 2,287,891    
Exercised (in shares) | shares   (338,989)      
Outstanding shares at the end of the year | shares   1,888,593 2,287,891    
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      
Outstanding shares at the end of the year (in dollars per share) | $ / shares   $ 2.05 $ 2.05    
Non-controlling interest activity          
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 $ 4.2 $ 4.2      
Stock award activity, Shares          
Outstanding shares at the beginning of the year | shares   2,652,386      
Granted (in shares) | shares     2,652,386    
Outstanding shares at the end of the year | shares   2,652,386 2,652,386    
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    
Outstanding shares at the end of the year (in dollars per share) | $ / shares   $ 2.63 $ 2.63    
Non-controlling interest activity          
Balance at the beginning of the period   $ 36.3 $ 32.1    
Net earnings   0.6 1.3    
Dividend paid     (0.2)    
Balance at the end of the period   $ 36.9 $ 33.2    
Purchase price for initial subscription (in dollars per share) | (per share) $ 38.44 $ 2.63