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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | Dec. 28, 2016 | Dec. 30, 2015
--- | --- | ---
Valuation Allowance [Line Items] |  |
Tax credit carryforward | $ 13,541 | $ 20,691
Alternative minimum tax credit carryforwards | 3,534 | 5,344
Valuation allowance | 12,567 | $ 12,395
Valuation allowance, amount to be credited to paid-in capital | 2,000 |
General Business Tax Credit Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Tax credit carryforward | 17,000 |
Tax credit carryforwards unrecognized | 6,900 |
Alternative Minimum Tax Credit Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Alternative minimum tax credit carryforwards | 3,500 |
South Carolina NOL Carryforwards [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation allowance | $ 9,700 |

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