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Marketable Securities: (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Marketable Securities:
Government debt securities, at par value	$ 25,048	$ 25,147
Less discount	(256)	(314)
Government debt securities, net	24,792	24,833
Unrealized gain	1,499	1,803
Fair value	26,291	26,636
Future contractual maturities of marketable securities
1 year or less	1,378
2 to 5 years	23,670
Future contractual maturities of marketable securities	$ 25,048	$ 25,147

X

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

This item represents debt securities, at par value, after one year and through five years from the balance sheet date and which are categorized as held-to-maturity.

+ References

No definition available.

+ Details

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X

- Definition

This item represents debt securities, at par value, which are expected to mature within one year of the balance sheet date and which are categorized as held-to-maturity.

+ References

No definition available.

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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

No definition available.

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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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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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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-Publisher FASB

-Name Accounting Standards Codification

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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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-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.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Number 115

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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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