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Marketable Securities: (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Marketable Securities: |  |
Government debt securities, at par value | $ 24,458 | $ 25,147
Less discount | (201) | (314)
Government debt securities, net | 24,257 | 24,833
Unrealized gain | 1,228 | 1,803
Fair value | 25,485 | 26,636
Future contractual maturities of marketable securities |  |
1 year or less | 1,378 |
2 to 5 years | 23,080 |
Future contractual maturities of marketable securities | $ 24,458 | $ 25,147

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