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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2017 | Oct. 02, 2016 | Oct. 01, 2017 | Oct. 02, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Effective tax rate | 21.70% | 30.20% | 26.70% | 33.80%
Provision for income taxes | $ 5,767 | $ 9,144 | $ 18,678 | $ 27,464
Possible reduction in liabilities for uncertain tax positions | 900 |  | 900 |
Adjustments from Change in Estimates [Member] |  |  |  |
Income tax expense (benefit) [Line Items] |  |  |  |
Other income tax benefit (expense) |  | $ 1,800 |  | $ 1,800
Adjustments for New Accounting Pronouncement [Member] | ASU 2016-09 [Member] |  |  |  |
Income tax expense (benefit) [Line Items] |  |  |  |
Other income tax benefit (expense) | 300 |  | 2,100 |
Adjustments from Completion of Tax Audits [Member] |  |  |  |
Income tax expense (benefit) [Line Items] |  |  |  |
Other income tax benefit (expense) | $ 2,100 |  | $ 2,100 |

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