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Marketable Securities: (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Investments, Debt and Equity Securities [Abstract] |  |
Government debt securities, at par value | $ 0 | $ 23,769
Less discount | 0 | (102)
Government debt securities, net | 0 | 23,667
Unrealized gain | 0 | 685
Fair value (Level 1 measurement) | $ 0 | $ 24,352

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