This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

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+ Details

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

Financial Instruments And Derivatives (Schedule Of Fair Value Of Financial Assets And Liabilities Measured On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Dec. 31, 2011
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	$ 570,677	$ 593,402
Derivatives, Assets	146
Assets	570,823	593,402
Derivatives, Liabilities		314
Contingent consideration	61,210	68,892
Liabilities	61,210	69,206
Money Market Funds [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	350,544	396,329
U.S. Government Agency Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	91,293	83,197
Corporate Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	46,069	44,829
Commercial Paper [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	33,539	29,924
U.S. Treasury Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	23,600	14,180
Certificates Of Deposit And Time Deposits [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	16,183	16,432
Equity And Debt Mutual Funds [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	9,167	8,237
Non-U.S. Government Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	282	274
Available-for-sale Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	570,677
Level 1 [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities		419,020
Derivatives, Assets
Assets	383,593	419,020
Derivatives, Liabilities
Contingent consideration
Liabilities
Level 1 [Member] \| Money Market Funds [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	350,544	396,329
Level 1 [Member] \| U.S. Government Agency Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 1 [Member] \| Corporate Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 1 [Member] \| Commercial Paper [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 1 [Member] \| U.S. Treasury Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	23,600	14,180
Level 1 [Member] \| Certificates Of Deposit And Time Deposits [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 1 [Member] \| Equity And Debt Mutual Funds [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	9,167	8,237
Level 1 [Member] \| Non-U.S. Government Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	282	274
Level 1 [Member] \| Available-for-sale Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	383,593
Level 2 [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities		174,382
Derivatives, Assets	146
Assets	187,230	174,382
Derivatives, Liabilities		314
Contingent consideration
Liabilities		314
Level 2 [Member] \| Money Market Funds [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 2 [Member] \| U.S. Government Agency Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	91,293	83,197
Level 2 [Member] \| Corporate Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	46,069	44,829
Level 2 [Member] \| Commercial Paper [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	33,539	29,924
Level 2 [Member] \| U.S. Treasury Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 2 [Member] \| Certificates Of Deposit And Time Deposits [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	16,183	16,432
Level 2 [Member] \| Equity And Debt Mutual Funds [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 2 [Member] \| Non-U.S. Government Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 2 [Member] \| Available-for-sale Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities	187,084
Level 3 [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Derivatives, Assets
Assets
Derivatives, Liabilities
Contingent consideration	61,210	68,892
Liabilities	61,210	68,892
Level 3 [Member] \| Money Market Funds [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 3 [Member] \| U.S. Government Agency Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 3 [Member] \| Corporate Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 3 [Member] \| Commercial Paper [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 3 [Member] \| U.S. Treasury Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 3 [Member] \| Certificates Of Deposit And Time Deposits [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 3 [Member] \| Equity And Debt Mutual Funds [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 3 [Member] \| Non-U.S. Government Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities
Level 3 [Member] \| Available-for-sale Securities [Member]
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items]
Available for sale securities