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Short-Term Investments And Fair Value Measurement (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Short-Term Investments And Fair Value Measurement [Abstract]
Material other-than-temporary impairments or credit losses related to available-for-sale securities	$ 0	$ 0
Material gross realized gains or losses	$ 0	$ 0

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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