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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 |  |  |

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