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Fair Value (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Long-term investments	$ 12,200,000
Maturity term	10 years
Unrealized losses still held	1,859,000	2,681,000
Fair value of auction rate securities	10,300,000
Unrealized gains (losses) on long-term Investments	$ 0	$ 600,000
Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Interest rates reset period	7 days
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Interest rates reset period	35 days

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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