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Fair Value (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Fair Value [Abstract]
Long-term investments	$ 28,000,000
Interest rates reset days (Minimum)	7
Interest rates reset days (Maximum)	35
Maturity term, years	10
Unrealized losses still held as of March 31	2,681,000	3,624,000
Fair value of auction rate securities	25,300,000
Unrealized gains on long-term Investments	$ 600,000	$ 200,000

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