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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 980 | $ 637 | $ 623
Charged to costs and expenses | (286) | 422 | 160
Other additions | 220 | (61) | 2
Deductions | 78 | 18 | 148
Balance at end of year | 836 | 980 | 637
Balance of valuation allowance | 980 | 637 | 623
Environmental Reserves [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 28,004 | 21,864 | 21,667
Charged to costs and expenses | 1,981 | 7,491 | 894
Other additions | 0 | 0 | 0
Deductions | 6,366 | 1,351 | 697
Balance at end of year | 23,619 | 28,004 | 21,864
Balance of valuation allowance | 28,004 | 21,864 | 21,667
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 30,316 | 18,681 | 17,650
Charged to costs and expenses | 1,209 | 7 | 3
Other additions | 150 | 11,628 | 1,028
Deductions | 6,364 | 0 | 0
Balance at end of year | 25,311 | 30,316 | 18,681
Period increase in valuation allowance |  | 11,600 |
Balance of valuation allowance | $ 30,316 | $ 18,681 | $ 17,650

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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