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Marketable Securities: (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
Marketable Securities: |
Reconciliation of marketable securities |
|  | 2011 |  | 2010 |
--- | --- | --- | --- | --- | ---
Government debt securities, at par value |  | $ | 25,147 |  | $ | 26,509 |
Less discount |  |  | (314 | ) |  | (574 | )
|  |  | 24,833 |  |  | 25,935 |
Unrealized gain |  |  | 1,803 |  |  | 2,612 |
Fair value |  | $ | 26,636 |  | $ | 28,547 |
Future contractual maturities of marketable securities |
1 year or less |  | $ | 1,378 |
2 to 5 years |  |  | 23,769 |
|  | $ | 25,147 |

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