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SHORT-TERM INVESTMENTS: (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Investments |  |  |  |  |
Trading securities | $ 357,400,000 |  | $ 357,400,000 |  | $ 127,800,000
Weighted average interest rate (as a percent) |  |  | 2.18% |  | 1.87%
Available-for-sale | 6,100,000 |  | 6,100,000 |  | 6,500,000
Weighted average interest rate (as a percent) |  |  | 0.42% |  | 0.43%
Total short-term investments | 363,464,000 |  | 363,464,000 |  | 134,298,000
Trading securities: |  |  |  |  |
Interest earned | 1,900,000 | 900,000 | 3,900,000 | 2,500,000 |
Unrealized gain (loss) | (3,300,000) | 3,700,000 | (2,300,000) | 8,800,000 |
Available-for-sale: |  |  |  |  |
Investment redeemed |  | 200,000 | 400,000 | 1,400,000 |
Maximum |  |  |  |  |
Available-for-sale: |  |  |  |  |
Interest earned | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000 |

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