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Income Taxes (Unrecognized Tax Benefits - Text) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 27, 2015 | Dec. 28, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | $ 19,430 | $ 17,563 | $ 17,068 | $ 13,591
Portion of unrecognized tax benefits, including accrued interest and penalties, that if recognized, would impact the effective tax rate | 19,300 | 18,300 |  |
Income tax penalties and interest benefit (expense) | 600 | (1,500) | 200 |
Unrecognized tax benefits, income tax penalties and interest accrued | 1,600 | 2,200 |  |
Unrecognized tax benefits, increase resulting from prior period tax positions | 3,022 | 2,177 | $ 73 |
Minimum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits, increase resulting from prior period tax positions | $ 2,000 |  |  |
Maximum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits, increase resulting from prior period tax positions |  | $ 3,000 |  |

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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