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Marketable Securities: (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Government debt securities, at par value	$ 0	$ 23,769
Less discount	0	(102)
Government debt securities, net	0	23,667
Unrealized gain	0	685
Fair value (Level 1 measurement)	$ 0	$ 24,352

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- Definition

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

+ References

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- 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

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Held To Maturity Securities Unrecognized Holding Gains1

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

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