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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 01, 2017 USD ($) | Jul. 01, 2017 USD ($) Segment | Jul. 02, 2016 USD ($) | Dec. 31, 2016 USD ($)
Accounting Policies [Abstract] |  |  |  |
Number of reportable segments | Segment |  | 2 |  |
Business Acquisition [Line Items] |  |  |  |
Additional post-closing consideration |  | $ 165 | $ 56,617 |
Restricted Cash |  | $ 2,141 |  | $ 2,082
Banker's acceptance drafts, maturity period |  | 6 months |  |
Banker's acceptance drafts |  | $ 10,181 |  | $ 7,852
PAAL [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Additional post-closing consideration | $ 165 |  |  |

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