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SHORT TERM INVESTMENTS: (Tables) | 6 Months Ended
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Jun. 30, 2011
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments |
|  | At June 30, 2011 |  | At December 31, 2010 |
Trading securities |  | $ | 216.4 |  | $ | 66.9 |
Weighted average interest rate |  | 2.02 | % | 1.14 | %
Available for sale |  | $ | 9.0 |  | $ | 9.3 |
Weighted average interest rate |  | 0.37 | % | 1.01 | %
Total |  | $ | 225.4 |  | $ | 76.2 |
Summary of activities in short-term investments |
|  | Three months ended |  | Six months ended |
|  | June 30, |  | June 30, |
|  | 2011 |  | 2010 |  | 2011 |  | 2010 |
Trading securities: |  |  |  |  |  |  |  |  |
Interest earned |  | $ | 1.0 |  | $ | 0.1 |  | $ | 1.4 |  | $ | 0.1 |
Available for sale: |  |  |  |  |  |  |  |  |
Interest earned |  | (* | ) | (* | ) | (* | ) | 0.1 |
Investment redeemed |  | $ | 0.4 |  | $ | 7.7 |  | $ | 0.8 |  | $ | 11.2 |
(*) Less than $0.1 million

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