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Operating (Gains), Losses and Other Charges, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2018 | Sep. 27, 2017 | Sep. 26, 2018 | Sep. 27, 2017 | Dec. 27, 2017
Other Income and Expenses [Abstract] |  |  |  |  |  |
Software implementation costs | $ 0 | $ 1,001 | $ 0 |  | $ 4,669 |
Gains on sales of assets and other, net | (695) | (411) | (759) |  | (1,646) |
Restructuring charges and exit costs | 48 | 40 | 816 |  | 436 |
Impairment charges | 1,440 | 0 | 1,558 |  | 0 |
Operating (gains), losses and other charges, net | 793 | 630 | 1,615 |  | 3,459 |
Restructuring Charges [Abstract] |  |  |  |  |  |
Exit costs | 48 | 40 | 347 | [1] | 366 |
Severance and other restructuring charges | 0 | 0 | 469 |  | 70 |
Total restructuring charges and exit costs | 48 | 40 | 816 |  | 436 |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, December 27, 2017 |  |  | 1,180 |  |  |
Exit costs | 48 | $ 40 | 347 | [1] | $ 366 |
Payments, net of sublease receipts |  |  | (440) |  |  |
Interest accretion |  |  | 57 |  |  |
Balance, September 26, 2018 | 1,144 |  | 1,144 |  |  |
Less current portion included in other current liabilities | 489 |  | 489 |  |  |
Long-term portion included in other noncurrent liabilities | 655 |  | 655 |  |  |
Accrued severance and other restructuring charges | $ 100 |  | $ 100 |  |  | $ 100
[1] | Included as a component of operating (gains), losses and other charges, net.

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