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Fair Value of Financial Instruments - Assets in Level 3 (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 30, 2017
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Fair value assets reconciliation of changes |  |
Balance at the beginning of the period | $ 5,681 |
Loss included in other comprehensive loss | (72) |
Balance at the end of the period | 5,609 |
Convertible Senior Notes |  |
Fair value assets reconciliation of changes |  |
Fair value of debt | $ 457,400 | $ 466,200

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