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Operating (Gains), Losses and Other Charges, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 27, 2018 | Jun. 28, 2017 | Jun. 27, 2018 | Jun. 28, 2017 | Dec. 27, 2017
Other Income and Expenses [Abstract] |  |  |  |  |  |
Software implementation costs | $ 0 | $ 1,544 | $ 0 |  | $ 3,668 |
(Gains) losses on sales of assets and other, net | (27) | 205 | (64) |  | (1,235) |
Restructuring charges and exit costs | 408 | 297 | 768 |  | 396 |
Impairment charges | 81 | 0 | 118 |  | 0 |
Operating (gains), losses and other charges, net | 462 | 2,046 | 822 |  | 2,829 |
Restructuring Charges [Abstract] |  |  |  |  |  |
Exit costs | 275 | 295 | 299 | [1] | 326 |
Severance and other restructuring charges | 133 | 2 | 469 |  | 70 |
Total restructuring charges and exit costs | 408 | 297 | 768 |  | 396 |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, December 27, 2017 |  |  | 1,180 |  |  |
Exit costs | 275 | $ 295 | 299 | [1] | $ 326 |
Payments, net of sublease receipts |  |  | (316) |  |  |
Interest accretion |  |  | 40 |  |  |
Balance, June 27, 2018 | 1,203 |  | 1,203 |  |  |
Less current portion included in other current liabilities | 519 |  | 519 |  |  |
Long-term portion included in other noncurrent liabilities | 684 |  | 684 |  |  |
Accrued severance and other restructuring charges | $ 200 |  | $ 200 |  |  | $ 100
[1] | Included as a component of operating (gains), losses and other charges, net.

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