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