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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
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 | $ 836 | $ 980 | $ 637
Charged to costs and expenses | (81) | (286) | 422
Other additions | 263 | 220 | (61)
Deductions | 248 | 78 | 18
Balance at end of year | 770 | 836 | 980
Balance of valuation allowance | 770 | 980 | 980
Environmental Reserves [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 23,619 | 28,004 | 21,864
Charged to costs and expenses | 1,659 | 1,981 | 7,491
Other additions | 0 | 0 | 0
Deductions | 4,412 | 6,366 | 1,351
Balance at end of year | 20,866 | 23,619 | 28,004
Balance of valuation allowance | 20,866 | 28,004 | 21,864
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 | 25,311 | 30,316 | 18,681
Charged to costs and expenses | 2,919 | 1,209 | 7
Other additions | 290 | 150 | 11,628
Deductions | 5,390 | 6,364 | 0
Balance at end of year | 23,130 | 25,311 | 30,316
Period increase in valuation allowance |  |  | 11,600
Balance of valuation allowance | $ 23,130 | $ 30,316 | $ 18,681

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