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Investments (Schedule Of Proceeds And Realized Gains/(Losses) On Equity Securities And Certificates Of Deposit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments [Abstract]
Proceeds	$ 12,950	$ 9,327	$ 10,828
Gross Realized Gains	124	6
Gross Realized Losses			$ (299)

X

- Definition

Gross realized gains on non-marketable certificates of deposit and other securities.

+ References

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X

- Definition

Gross realized losses on non-marketable certificates of deposit and other securities.

+ References

No definition available.

+ Details

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X

- Definition

Proceeds from sale of non marketable certificates of deposit and other securities.

+ References

No definition available.

+ Details

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