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SHORT-TERM INVESTMENTS: (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Investments |  |
Trading securities | $ 202,600,000 | $ 127,800,000
Weighted average interest rate (as a percent) | 3.78% | 1.87%
Available-for-sale | 5,700,000 | 6,500,000
Weighted average interest rate (as a percent) | 0.42% | 0.43%
Total short-term investments | 208,268,000 | 134,298,000
Trading securities: |  |
Interest earned | 5,200,000 | 3,100,000
Unrealized gain (loss) | (1,900,000) | 2,400,000
Available-for-sale |  |
Interest earned |  | 100,000
Investment redeemed | 800,000 | 1,900,000
Contractual maturities of the Company's available for sale debt securities |  |
One year or less | 400,000 | 400,000
Maturing after five years through ten years | 200,000 |
Due after 10 years | 5,100,000 | 6,100,000
Total debt securities | 5,700,000 | 6,500,000
Maximum |  |
Available-for-sale |  |
Interest earned | $ 100,000 |

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