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STOCKHOLDERS' EQUITY: (Details 4) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Non-controlling interest |  |  |
Investment shareholders' interest in Peruvian Branch (as a percent) | 0.71% |  |
Employee Stock Purchase 2007 Plan |  |  |
Information related to compensation cost |  |  |
Stock based compensation expense |  | $ 2.1 | $ 2.1
Unrecognized compensation expense |  |  | $ 2.1
Stock award activity, Shares |  |  |
Outstanding shares at the beginning of the year | 4,298,612 | 4,449,599 |
Exercised (in shares) | (4,189,371) | (150,987) |
Outstanding shares at the end of the year | 109,241 | 4,298,612 | 4,449,599
Unit Weighted Average Grant Date Fair Value |  |  |
Outstanding shares at the beginning of the year (in dollars per share) | $ 1.16 | $ 1.16 |
Exercised (in dollars per share) | 1.16 | 1.16 |
Outstanding shares at the end of the year (in dollars per share) | $ 1.16 | $ 1.16 | $ 1.16
Employee Stock Purchase 2010 Plan |  |  |
Information related to compensation cost |  |  |
Stock based compensation expense | $ 0.6 | $ 0.6 | $ 0.6
Unrecognized compensation expense | $ 1.4 | $ 2.0 | $ 2.6
Period over which unrecognized compensation expense expected to be recognized | 3 years |  |
Stock award activity, Shares |  |  |
Outstanding shares at the beginning of the year | 2,287,891 | 3,012,464 |
Exercised (in shares) | (60,309) | (724,573) |
Outstanding shares at the end of the year | 2,227,582 | 2,287,891 | 3,012,464
Unit Weighted Average Grant Date Fair Value |  |  |
Outstanding shares at the beginning of the year (in dollars per share) | $ 2.05 | $ 2.05 |
Exercised (in dollars per share) | 2.05 | 2.05 |
Outstanding shares at the end of the year (in dollars per share) | $ 2.05 | $ 2.05 | $ 2.05
Employee Stock Purchase 2015 Plan |  |  |
Information related to compensation cost |  |  |
Stock based compensation expense | $ 0.4 |  |
Unrecognized compensation expense | $ 4.4 |  |
Stock award activity, Shares |  |  |
Granted (in shares) | 2,652,386 |  |
Outstanding shares at the end of the year | 2,652,386 |  |
Unit Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share) | $ 2.63 |  |
Outstanding shares at the end of the year (in dollars per share) | $ 2.63 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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