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Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016
Recent Accounting Pronouncements |  |  |  |
Excess tax benefit | $ 1,261 | $ 1,710 | $ (709) | $ 1,975
Accounting Standards Update 2016-09 - Compensation-Stock Compensation | Scenario, Adjustment |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Excess tax benefit |  |  | $ (3,900) |

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