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Fair Value (Schedule Of Auction Rate Securities Where Fair Value Is Determined Using Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Fair Value [Abstract]
Balance, beginning of year	$ 13,031	$ 12,459
Unrealized gain (loss) included in other comprehensive income (loss)	(240)	572
Losses deemed other than temporary reclassified from other comprehensive loss	1,659	0
Impairment losses included in interest income (loss), net	(8,670)	0
Balance, end of year	$ 5,780	$ 13,031

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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