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SHORT-TERM INVESTMENTS: (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Investments |  |  |
Trading securities | $ 198,000,000 |  | $ 127,800,000
Weighted average interest rate (as a percent) | 1.43% |  | 1.87%
Available for sale | 6,500,000 |  | 6,500,000
Weighted average interest rate (as a percent) | 0.44% |  | 0.43%
Total short-term investments | 204,488,000 |  | 134,298,000
Trading securities: |  |  |
Interest earned | 600,000 | 800,000 |
Unrealized gain (loss) | 1,100,000 | 5,000,000 |
Available-for-sale: |  |  |
Investment redeemed |  | 300,000 |
Maximum |  |  |
Available-for-sale: |  |  |
Interest earned | $ 100,000 | $ 100,000 |

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