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Marketable Securities: (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Marketable Securities: |  |
Government debt securities, at par value | $ 24,359 | $ 25,147
Less discount | (150) | (314)
Government debt securities, net | 24,209 | 24,833
Unrealized gain | 967 | 1,803
Fair value | $ 25,176 | $ 26,636

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