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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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This item represents the amount of discount on the face value of the held-to-maturity securities.

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This item represents the aggregate par value of investments in debt securities as of the balance sheet date which are categorized as held-to-maturity.

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This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

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The carrying amount of securities categorized as held-to-maturity which serve as security for borrowings or other arrangements.

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As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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