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Cash, Cash Equivalents and Investments (Details Textual) (USD $)			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Maximum [Member] Commercial Paper [Member]	Sep. 30, 2012 Minimum [Member]
Cash, Cash equivalents and Investments (Textual) [Abstract]
Maturities period of cash, cash equivalents and short-term investments			3 years
Maturities Period of Short-term investments and securities			1 year		90 days
Gross unrealized loss available for sale equity securities	$ 3,263	$ 3,307
Period of held to maturity securities continuous unrealized loss position				12 months

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized as held-to-maturity.

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