Financial Instruments And Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2012

Financial Instruments And Marketable Securities [Abstract]

Fair Value Hierarchy Of Assets Measured On A Recurring Basis

The following table presents the placement in the fair value hierarchy of assets that are measured at fair value on a recurring basis:

December 31, 2012:	Total		Level 1	Level 2	Level 3
Common stock	$	354	354	—	—
Total available-for-sale securities	$	354	354	—	—

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

Marketable Securities Treated As Available-For-Sale Securities

Marketable securities, all treated as available-for-sale securities, consist of the following:

December 31, 2012:	Amortized cost		Gross unrealized gains	Gross unrealized losses	Fair value
Common stock	$	197	157	—	354
Total available-for-sale securities	$	197	157	—	354

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

Future Maturities Of Available-For-Sale Securities

Future maturities of our available-for-sale securities consist of the following:

	Less than 12 months			Greater than 12 months
December 31, 2012:	Amortized cost		Fair value	Amortized cost	Fair value
Common stock	$	197	354	—	—
Total available-for-sale securities	$	197	354	—	—