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Fair Value (Narrative) (Details) (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2011 | Sep. 30, 2010
Fair Value [Abstract] |  |
Long-term investments | $ 28,100,000 |
Interest rate reset day (Minimum) | 7 |
Interest rate reset day (Maximum) | 35 |
Maturity term (Minimum), years | 10 |
Unrealized losses still held as of September 30 | 3,255,000 | 3,598,000
Fair value of auction rate securities | 24,800,000 |
Unrealized gains on long-term Investments | $ 600,000 | $ 800,000

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