Cash, Cash Equivalents And Marketable Securities (Schedule Of Gross Unrealized Losses And Fair Values Of Investments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 item
Cash, Cash Equivalents And Marketable Securities [Line Items]
Number of securities in an unrealized loss position	7
Corporate Debt Securities [Member]
Cash, Cash Equivalents And Marketable Securities [Line Items]
Fair Value, Less than 12 months	4,475
Gross Unrealized Losses, Less than 12 months	(2)
Fair Value, Total	4,475
Gross Unrealized Losses, Total	(2)

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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- Definition

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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