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Financial Instruments And Marketable Securities (Marketable Securities Treated As Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	$ 27,048	$ 31,198
Total available-for-sale securities, Gross unrealized gains	123	40
Total available-for-sale securities, Gross unrealized losses	(6)	(19)
Total available-for-sale securities, Fair value	27,165	31,219
Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	197	183
Total available-for-sale securities, Gross unrealized gains	123	40
Total available-for-sale securities, Gross unrealized losses	0	0
Total available-for-sale securities, Fair value	320	223
Government And Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	26,851	25,851
Total available-for-sale securities, Gross unrealized gains	0	0
Total available-for-sale securities, Gross unrealized losses	(6)	(7)
Total available-for-sale securities, Fair value	26,845	25,844
State And Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost		5,164
Total available-for-sale securities, Gross unrealized gains		0
Total available-for-sale securities, Gross unrealized losses		(12)
Total available-for-sale securities, Fair value		$ 5,152

X

- Definition

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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