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Summary of Significant Accounting Policies - Income Taxes (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013
Valuation Allowance, Deferred Tax Asset, Change in Amount |  |  | $ 2,100,000 |
Tax provision | 7,713,000 | 3,385,000 | 11,463,000 | 3,403,000
Effective income tax rate | 34.60% | 30.30% | 28.70% | 12.20%
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities |  |  |  | 2,700,000
Income Tax Reconciliation, Tax Credits, Research |  |  |  | 1,700,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | $ 700,000 |  | $ 700,000 |

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