Income Taxes - Deferred Tax Asset Valuation Allowance Activity (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 30, 2017 |
Dec. 31, 2016 |
|
| Movement in Valuation Allowances and Reserves [Roll Forward] | ||
| Balance as of beginning of the year | $ 97,552 | $ 103,311 |
| Valuation allowance provided for taxes related to: | ||
| (Income) loss before income taxes | (4,300) | (5,759) |
| Tax Cuts and Jobs Act of 2017 | (29,387) | 0 |
| Release of valuation allowance | (53,450) | 0 |
| Balance as of end of the year | $ 10,415 | $ 97,552 |