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Marketable Securities: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Marketable Securities:
Government debt securities, at par value	$ 23,670	$ 23,769
Less discount	(58)	(102)
Government debt securities, net	23,612	23,667
Unrealized gain	416	685
Fair value (Level 1 measurement)	$ 24,028	$ 24,352
Maximum future contractual maturity of marketable securities	1 year

X

- Definition

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

+ References

No definition available.

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X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

Represents the maximum remaining period to contractual maturity for marketable securities held by the entity.

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- Definition

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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- Definition

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

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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