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Fair Value of Financial Instruments - Liabilities in Level 3 (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 01, 2017 | Dec. 31, 2016
Fair value liabilities reconciliation of changes |  |
Fair value of debt | $ 0 | $ 72,500
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Contingent consideration |  |
Fair value liabilities reconciliation of changes |  |
Issues | 3,829 |
Balance at the end of the period | 3,829 |
Convertible Senior Notes |  |
Fair value liabilities reconciliation of changes |  |
Fair value of debt | $ 426,300 |

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