Investments (Available-For-Sale And Held-To-Maturity Securities Included In Consolidated Balance Sheets) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Investments [Abstract]
Available-for-Sale Securities, Cash and cash equivalents
Available-for-Sale Securities, Short-term investments		1
Available-for-Sale Securities, Other long-term assets (including investments and restricted cash)
Available-for-Sale Securities, total		1
Held-to-Maturity Securities, Cash and cash equivalents		6,200
Held-to-Maturity Securities, Short-term investments	47,935	13,870
Held-to-Maturity Securities, Other long-term assets (including investments and restricted cash)	1,280	1,280
Held-to-Maturity Securities, total	$ 49,215	$ 21,350

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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- Definition

For an unclassified balance sheet, this item represents equity securities categorized neither as held-to-maturity nor trading.

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- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities within one year of the balance sheet date or the normal operating cycle, whichever is longer; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

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