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Marketable Securities: (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Marketable Securities: |  |
Government debt securities, at par value | $ 23,769 | $ 25,147
Less discount | (102) | (314)
Government debt securities, net | 23,667 | 24,833
Unrealized gain | 685 | 1,803
Fair value | $ 24,352 | $ 26,636
Maximum future contractual maturity of marketable securities | 1 year |

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