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Marketable Securities: | 12 Months Ended
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Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities: | Marketable Securities: Marketable securities at December 31, 2013 and 2012 consists of the following:
| 2013 |  | 2012
Government debt securities, at par value | $ | — |  |  | $ | 23,769 |
Less discount | — |  |  | (102 | )
| — |  |  | 23,667 |
Unrealized gain | — |  |  | 685 |
Fair value | $ | — |  |  | $ | 24,352 |
The proceeds from maturities and interest receipts from the marketable securities were restricted to the service of the Greeley Note (See Note 11—Bank and Other Notes Payable). On September 1, 2013, the Greeley note was paid off in full.

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