Investment in Marketable Securities (Details) (USD $)	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Investment in Marketable Securities (Textual) [Abstract]
Other comprehensive unrealized gain	$ 400,000	$ 0
Short term investments	1,316,000		20,254,000
Marketable securities [Member]
Available-for-sale Securities
Available-for-sale Securities, Amortized Cost	24,819,000	24,819,000
Available-for-sales Securities, Gross Unrealized Losses	(4,551,000)	(4,975,000)
Available-for-sale Securities, Gross Unrealized Gains	0	0
Available-for-sale Securities, Estimated Fair Value	$ 20,268,000	$ 19,844,000

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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+ Details

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details

- Definition

Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer.

+ References

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

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-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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+ Details