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Marketable Securities: (Tables) | 9 Months Ended
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Sep. 30, 2012
Marketable Securities: |
Reconciliation of marketable securities |
|  | September 30, 2012 |  | December 31, 2011 |
--- | --- | --- | --- | --- | ---
Government debt securities, at par value |  | $ | 24,359 |  | $ | 25,147 |
Less discount |  |  | (150 | ) |  | (314 | )
|  |  | 24,209 |  |  | 24,833 |
Unrealized gain |  |  | 967 |  |  | 1,803 |
Fair value (Level 1 measurement) |  | $ | 25,176 |  | $ | 26,636 |

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