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Fair Value Measurements (Financial Assets Measured At Fair Value On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Restricted Cash and Cash Equivalents Items [Line Items]
Foreign currency derivative contracts	$ (351)	$ 1,219
Total financials assets	2,466,833	2,098,412
Level 1 [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total financials assets	303,780	226,092
Level 2 [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Foreign currency derivative contracts	(351)	1,219
Total financials assets	2,156,975	1,864,330
Level 3 [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total financials assets	6,078	7,990
Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash equivalents	303,780	226,092
Money Market Funds [Member] | Level 1 [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash equivalents	303,780	226,092
Government And Corporate Debentures - Fixed Interest Rate [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash equivalents	1,624,096	7,932
Marketable securities		1,323,370
Government And Corporate Debentures - Fixed Interest Rate [Member] | Level 2 [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash equivalents	1,624,096	7,932
Marketable securities		1,323,370
Government-Sponsored Enterprises [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable securities	337,471	332,799
Government-Sponsored Enterprises [Member] | Level 2 [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable securities	337,471	332,799
Government And Corporate Debentures - Floating Interest Rate [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable securities	195,759	199,010
Government And Corporate Debentures - Floating Interest Rate [Member] | Level 2 [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable securities	195,759	199,010
Auction Rate Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable securities	6,078	7,990
Auction Rate Securities [Member] | Level 3 [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable securities	$ 6,078	$ 7,990

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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