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Fair Value Measurements (Summary Of Valuation Of Company's Financial Instruments By Various Levels) (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 29, 2013
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Dec. 31, 2012
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | $ 142,445 | $ 232,050 | ||||||||
| Liabilities, Fair value | (1,613) | (1,619) | ||||||||
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Quoted Market Prices In Active Markets (Level 1) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 142,217 | 230,906 | ||||||||
| Liabilities, Fair value | 0 | 0 | ||||||||
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Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 228 | 1,144 | ||||||||
| Liabilities, Fair value | (1,613) | (1,619) | ||||||||
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Significant Unobservable Inputs (Level 3) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 0 | 0 | ||||||||
| Liabilities, Fair value | 0 | 0 | ||||||||
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Foreign Currency Forward Contracts [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 228 | [1] | 1,144 | [1] | ||||||
| Liabilities, Fair value | (1,613) | [2] | (1,619) | [2] | ||||||
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Foreign Currency Forward Contracts [Member] | Quoted Market Prices In Active Markets (Level 1) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 0 | [1] | 0 | [1] | ||||||
| Liabilities, Fair value | 0 | [2] | 0 | [2] | ||||||
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Foreign Currency Forward Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 228 | [1] | 1,144 | [1] | ||||||
| Liabilities, Fair value | (1,613) | [2] | (1,619) | [2] | ||||||
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Foreign Currency Forward Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 0 | [1] | 0 | [1] | ||||||
| Liabilities, Fair value | 0 | [2] | 0 | [2] | ||||||
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Money Market Funds [Member] | Cash Equivalents [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 1,284 | 3,061 | ||||||||
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Money Market Funds [Member] | Cash Equivalents [Member] | Quoted Market Prices In Active Markets (Level 1) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 1,284 | 3,061 | ||||||||
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Money Market Funds [Member] | Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 0 | 0 | ||||||||
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Money Market Funds [Member] | Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 0 | 0 | ||||||||
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U.S. Treasuries [Member] | Available-For-Sale Securities [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 140,768 | [3] | 225,062 | [3] | ||||||
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U.S. Treasuries [Member] | Available-For-Sale Securities [Member] | Quoted Market Prices In Active Markets (Level 1) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 140,768 | [3] | 225,062 | [3] | ||||||
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U.S. Treasuries [Member] | Available-For-Sale Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 0 | [3] | 0 | [3] | ||||||
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U.S. Treasuries [Member] | Available-For-Sale Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 0 | [3] | 0 | [3] | ||||||
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Certificates Of Deposits [Member] | Available-For-Sale Securities [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 165 | [3] | 2,783 | [3] | ||||||
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Certificates Of Deposits [Member] | Available-For-Sale Securities [Member] | Quoted Market Prices In Active Markets (Level 1) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 165 | [3] | 2,783 | [3] | ||||||
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Certificates Of Deposits [Member] | Available-For-Sale Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | 0 | [3] | 0 | [3] | ||||||
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Certificates Of Deposits [Member] | Available-For-Sale Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Assets, Fair value | $ 0 | [3] | $ 0 | [3] | ||||||
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