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Fair Value Measurements (Summary Of Valuation Of Company's Financial Instruments By Various Levels) (Details) - USD ($) $ in Thousands | Oct. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value |  | $ 143,858 | $ 151,304
Liabilities, Fair value |  | 11,749 | 1,705
Quoted Market Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value |  | 141,318 | 142,541
Liabilities, Fair value |  | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value |  | 2,540 | 8,763
Liabilities, Fair value |  | 11,749 | 1,705
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value |  | 0 | 0
Liabilities, Fair value |  | 0 | 0
Foreign Currency Forward Contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [1] | 2,540 | 8,763
Liabilities, Fair value | [2] | 11,749 | 1,705
Foreign Currency Forward Contracts [Member] | Quoted Market Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [1] | 0 | 0
Liabilities, Fair value | [2] | 0 | 0
Foreign Currency Forward Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [1] | 2,540 | 8,763
Liabilities, Fair value | [2] | 11,749 | 1,705
Foreign Currency Forward Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [1] | 0 | 0
Liabilities, Fair value | [2] | 0 | 0
Money Market Funds [Member] | Cash Equivalents [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value |  | 15,105 | 17,027
Money Market Funds [Member] | Cash Equivalents [Member] | Quoted Market Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value |  | 15,105 | 17,027
Money Market Funds [Member] | Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value |  | 0 | 0
Money Market Funds [Member] | Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value |  | 0 | 0
U.S. Treasuries [Member] | Available-For-Sale Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 124,087 | 123,838
U.S. Treasuries [Member] | Available-For-Sale Securities [Member] | Quoted Market Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 124,087 | 123,838
U.S. Treasuries [Member] | Available-For-Sale Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 0 | 0
U.S. Treasuries [Member] | Available-For-Sale Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 0 | 0
Certificates Of Deposits [Member] | Available-For-Sale Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 162 | 148
Certificates Of Deposits [Member] | Available-For-Sale Securities [Member] | Quoted Market Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 162 | 148
Certificates Of Deposits [Member] | Available-For-Sale Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 0 | 0
Certificates Of Deposits [Member] | Available-For-Sale Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 0 | 0
Mutual Funds [Member] | Trading Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 1,964 | 1,528
Mutual Funds [Member] | Trading Securities [Member] | Quoted Market Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 1,964 | 1,528
Mutual Funds [Member] | Trading Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | 0 | 0
Mutual Funds [Member] | Trading Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value | [3] | $ 0 | $ 0
[1] | Included in prepaid expenses and other current assets on the Company’s unaudited condensed consolidated balance sheets.
[2] | Included in other accrued liabilities on the Company’s unaudited condensed consolidated balance sheets.
[3] | Included in short-term investments on the Company’s unaudited condensed consolidated balance sheets.

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