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Earnings Per Share - Calculation of Income (Loss) Per Shares (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income | $ 26,210 | $ 8,172 | $ 62,768 | $ 43,858
Weighted Average Shares Outstanding (in shares) | 57,915 | 58,917 | 58,599 | 58,974
Participating Securities (in shares) | 518 | 579 | 518 | 579
Shares for Basic Earnings Per Share (in shares) | 58,433 | 59,496 | 59,117 | 59,553
Dilutive Effect of Stock Options (in shares) | 1 | 40 | 5 | 41
Shares for Diluted Earnings Per Share (in shares) | 58,434 | 59,536 | 59,122 | 59,594
Participating Securities |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income | $ 200 | $ 100 | $ 600 | $ 400

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