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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2015 | Dec. 31, 2014
Valuation Allowance [Line Items] |  |
Tax credit carryforward | $ 20,691 | $ 22,089
Alternative minimum tax credit carryforwards | 5,344 | 7,811
Valuation allowance | 12,395 | 12,481
Valuation allowance, amount to be credited to paid-in capital | 2,000 |
Unrecognized tax benefits | 0 | 0
Interest and penalties recognized on unrecognized tax benefits | 0 | $ 0
General Business Tax Credit Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Tax credit carryforward | 23,100 |
Tax credit carryforwards unrecognized | 5,300 |
Alternative Minimum Tax Credit Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Alternative minimum tax credit carryforwards | 5,300 |
AMT NOL Carryforwards [Member] |  |
Valuation Allowance [Line Items] |  |
NOL carryforwards | 5,800 |
South Carolina NOL Carryforwards [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation allowance | $ 10,000 |

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