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Stock Compensation (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 USD ($) trading_day $ / shares | Sep. 29, 2018 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock based compensation expense | $ | $ 1.2 | $ 1.7 | $ 2.5 | $ 14.7
Stock Appreciation Rights (SARs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Trading day average (in days) | trading_day | 20 |  |  |
Weighted average exercise price (in dollars per share) | $ / shares | $ 7.00 |  |  |
Stock Appreciation Rights (SARs) | Tranche One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 30 days |
Stock Appreciation Rights (SARs) | Tranche Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 1 year |

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