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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Investments |  |  |  |  |
Trading securities | $ 878,000 |  | $ 878,000 |  | $ 333,700
Weighted average interest rate (as a percent) |  |  | 1.04% |  | 0.78%
Available-for-sale | 4,100 |  | $ 4,100 |  | $ 4,900
Weighted average interest rate (as a percent) |  |  | 0.53% |  | 0.44%
Total short-term investments | 882,147 |  | $ 882,147 |  | $ 338,589
Available-for-sale |  |  |  |  |
Investment redeemed | 200 | $ 300 | 800 | $ 500 |
Trading: |  |  |  |  |
Interest earned | 400 | 1,100 | 900 | 3,600 |
Unrealized gain (loss) at the end of the period |  | 1,000 |  | 1,000 |
Maximum |  |  |  |  |
Available-for-sale |  |  |  |  |
Interest earned | 100 | $ 100 | 100 | $ 100 |
Trading: |  |  |  |  |
Unrealized gain (loss) at the end of the period | $ 100 |  | $ 100 |  |

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- Definition Represents the weighted average interest rate on debt and equity securities which are categorized neither as trading securities nor as held-to-maturity securities and that are intended be sold or will mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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