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Stockholders' Equity (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 07, 2017 | Feb. 06, 2017 | Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Class of Stock [Line Items] |  |  |  |  |  |
Income tax expense/(benefit) |  |  | $ 6,296,000 | $ (744,000) | $ 15,856,000 | $ 9,102,000
Shares (in shares) |  |  | 167,181,000 | 165,436,000 | 166,628,000 | 165,154,000
Payments for Repurchase of Common Stock |  |  |  |  | $ 0 | $ 5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 956,809 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 559,388 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Annual Vesting After Initial Cliff |  |  | 33.33% |  | 33.33% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Period Two |  |  |  |  | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Percentage |  |  | 100.00% |  | 100.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Holding Requirement |  |  |  |  | 2 years |
Period in force | 2 years |  |  |  |  |
Authorized amount | $ 100,000,000.0 |  |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Income tax expense/(benefit) |  |  |  |  | $ 100,000 |
Shares (in shares) |  |  |  |  | 155,000 |

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