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Insurance Reserves (Tables) | 12 Months Ended
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Dec. 31, 2017
Insurance Reserves |
Summary of Changes in Insurance Program Reserves | The following table summarizes changes in our insurance program reserves (in thousands):
Balance as of December 27, 2015 |  | $ | 30,550 |
Additions |  |  | 42,508 |
Payments |  |  | (37,615) |
Balance as of December 25, 2016 |  |  | 35,443 |
Additions |  |  | 47,032 |
Payments |  |  | (40,633) |
Balance as of December 31, 2017 |  | $ | 41,842 |

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