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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Investments |  |  |  |  |
Trading securities | $ 569,000 |  | $ 569,000 |  | $ 333,700
Weighted average interest rate (as a percent) |  |  | 0.52% |  | 0.78%
Available-for-sale | 4,300 |  | $ 4,300 |  | $ 4,900
Weighted average interest rate (as a percent) |  |  | 0.49% |  | 0.44%
Total short-term investments | 573,353 |  | $ 573,353 |  | $ 338,589
Trading: |  |  |  |  |
Interest earned | 200 | $ 1,100 | 500 | $ 2,500 |
Unrealized gain (loss) at the end of the period | (200) | 1,700 | (200) | 1,700 |
Available-for-sale |  |  |  |  |
Investment redeemed | 400 | 200 | 600 | 200 |
Maximum |  |  |  |  |
Available-for-sale |  |  |  |  |
Interest earned | $ 100 | $ 100 | $ 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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