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Debt Debt (Senior Notes Due 2026) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | May 02, 2018 EUR (€) | Jun. 03, 2015 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |
Debt extinguishment costs | $ | $ 23,509 | $ 0 | $ 23,509 | $ 0 |  |
Senior Notes [Member] | Senior Notes 3.625% Due 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  | € 515,000,000 |
Stated interest rate | 3.625% |  | 3.625% |  | 3.625% |
Debt Issuance costs | $ | $ 8,500 |  | $ 8,500 |  |  |
Senior Notes [Member] | Senior Notes 4.75% Due 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  |  | € 515,000,000.0
Stated interest rate | 4.75% |  | 4.75% |  |  | 4.75%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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