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Summary of Quarterly Results (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Quarterly Results [Abstract] |
Quarterly Financial Information [Table Text Block] |
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﻿(dollars in thousands, except per share amounts) |  | Thirteen Weeks Ended |  | Fourteen Weeks Ended
﻿ |  | March 26, 2016 |  | June 25, 2016 |  | September 24, 2016 |  | December 31, 2016
﻿Net sales |  | $ | 738,204 |  | $ | 730,433 |  | $ | 742,986 |  | $ | 925,097
﻿Gross profit on sales |  |  | 207,112 |  |  | 201,938 |  |  | 204,864 |  |  | 258,241
﻿Gain on bargain purchase |  |  | - |  |  | - |  |  | - |  |  | 23,879
﻿Net income |  |  | 20,129 |  |  | 15,265 |  |  | 10,628 |  |  | 41,140
﻿Basic and diluted earnings per share |  | $ | .75 |  | $ | .57 |  | $ | .40 |  | $ | 1.52
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﻿(dollars in thousands, except per share amounts) |  | Thirteen Weeks Ended
﻿ |  | March 28, 2015 |  | June 27, 2015 |  | September 26, 2015 |  | December 26, 2015
﻿Net sales |  | $ | 712,426 |  | $ | 718,380 |  | $ | 711,879 |  | $ | 734,063
﻿Gross profit on sales |  |  | 195,115 |  |  | 198,919 |  |  | 194,147 |  |  | 198,551
﻿Net income |  |  | 13,323 |  |  | 16,644 |  |  | 12,788 |  |  | 16,575
﻿Basic and diluted earnings per share |  | $ | .50 |  | $ | .62 |  | $ | .48 |  | $ | .61

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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