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Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018 | Dec. 30, 2018
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |
Other income, net | $ (106,203) | $ (2,969) | $ (98,103) | $ 5,623 |
Fair Value investments notice period |  |  | 45 days |  |
Minimum |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |
Fair Value investments notice period |  |  | 30 days |  |
Maximum |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |
Fair Value investments notice period |  |  | 90 days |  |
Fair Value, Recurring |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |
Available for sale investments, fair value option | 24,358 | 24,219 | $ 24,358 | 24,219 | $ 23,913
Other income, net | $ 177 | $ (342) | $ 727 | $ 106 |

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- Definition Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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