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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Allowance for Doubtful Accounts [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 637 | $ 623 | $ 666
Charged to costs and expenses | 422 | 160 | (130)
Other additions | (61) | 2 | 201
Deductions | 18 | 148 | 114
Balance at end of year | 980 | 637 | 623
Balance of valuation allowance | 637 | 623 | 666
Environmental Reserves [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 21,864 | 21,667 | 22,661
Charged to costs and expenses | 7,491 | 894 | 76
Other additions | 0 | 0 | 0
Deductions | 1,351 | 697 | 1,070
Balance at end of year | 28,004 | 21,864 | 21,667
Balance of valuation allowance | 21,864 | 21,667 | 22,661
Valuation Allowance of Deferred Tax Assets [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 18,681 | 17,650 | 17,119
Charged to costs and expenses | 7 | 3 | (5)
Other additions | 11,628 | 1,028 | 536
Deductions | 0 | 0 | 0
Balance at end of year | 30,316 | 18,681 | 17,650
Period increase in valuation allowance | 11,600 |  |
Balance of valuation allowance | $ 18,681 | $ 17,650 | $ 17,119

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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