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SHORT-TERM INVESTMENTS: (Tables) | 6 Months Ended
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Jun. 30, 2017
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At June 30, |  | At December 31, |
|  | 2017 |  | 2016 |
Trading securities |  | $ | 39.1 |  | $ | 49.2 |
Weighted average interest rate |  | 1.6 | % | 2.2 | %
Available-for-sale |  | $ | 1.1 |  | $ | 2.1 |
Weighted average interest rate |  | 0.70 | % | 0.78 | %
Total |  | $ | 40.2 |  | $ | 51.3 |
Summary of activities of short-term investments | The following table summarizes the activity of these investments by category (in millions):
|  | Three months ended |  | Six months ended |
|  | June 30, |  | June 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Trading securities: |  |  |  |  |  |  |  |  |
Interest earned |  | $ | 0.2 |  | $ | 0.3 |  | $ | 0.4 |  | $ | 0.7 |
Unrealized gain (loss) at the end of the period |  | $ | (* | ) | $ | 0.4 |  | $ | (0.1 | ) | $ | 0.4 |
Available-for-sale: |  |  |  |  |  |  |  |  |
Interest earned |  | (* | ) | (* | ) | (* | ) | (* | )
Investment redeemed |  | $ | 1.0 |  | $ | 0.2 |  | $ | 1.0 |  | $ | 0.5 |
(*) Less than $0.1 million.

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