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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2012

Marketable Securities [Abstract]

Fair Value Hierarchy Of Assets Measured On A Recurring Basis

March 31, 2012:		Total				Level 1				Level 2				Level 3
Common stock		$	347				347				0				0
Government and agency securities			26,847				26,847				0				0
Total available-for-sale securities		$	27,194				27,194				0				0

December 31, 2011:		Total				Level 1				Level 2				Level 3
Common stock		$	320				320				0				0
Government and agency securities			26,845				26,845				0				0
Total available-for-sale securities		$	27,165				27,165				0				0

March 31, 2011:		Total				Level 1				Level 2				Level 3
Common stock		$	337				337				0				0
State and municipal bonds			4,548				0				4,548				0
Government and agency securities			25,871				25,871				0				0
Total available-for-sale securities		$	30,756				26,208				4,548				0

Summary Of Future Maturities Of Available-For-Sale Securities

		Less than 12 months								Greater than 12 months
March 31, 2012:		Amortized cost				Fair value				Amortized cost				Fair value
Common stock		$	197				347				0				0
Government and agency securities			26,857				26,847				0				0
Total available-for-sale securities		$	27,054				27,194				0				0

Summary Of Marketable Securities Treated As Available-For-Sale Securities

March 31, 2012:		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Common stock		$	197				150				0				347
Government and agency securities			26,857				0				(10	)			26,847
Total available-for-sale securities		$	27,054				150				(10	)			27,194

December 31, 2011:		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Common stock		$	197				123				0				320
Government and agency securities			26,851				0				(6	)			26,845
Total available-for-sale securities		$	27,048				123				(6	)			27,165

March 31, 2011:		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Common stock		$	183				154				0				337
State and municipal bonds			4,560				0				(12	)			4,548
Government and agency securities			25,851				20				0				25,871
Total available-for-sale securities		$	30,594				174				(12	)			30,756

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Maturities of our available for sale securities

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Tabular disclosure of available-for-sale securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt.

+ References

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Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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