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Debt - Derivatives (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 25, 2017 | Jun. 26, 2016 | Jun. 25, 2017 | Jun. 26, 2016
Debt |  |  |  |
Weighted average interest rate for Credit Facility borrowings, including the impact of interest rate swaps | 2.30% | 2.10% | 2.30% | 2.10%
Interest paid | $ 2,100,000 | $ 1,800,000 | $ 3,900,000 | $ 3,400,000
Interest rate swap |  |  |  |
Debt |  |  |  |
Interest rate swap liabilities | $ 3,100,000 |  | 3,100,000 |
Interest rate swap | Interest expense |  |  |  |
Debt |  |  |  |
Portion of derivative liability that would be reclassified into earnings |  |  | $ 200,000 |
Estimate of period of time over which portion of derivative liability would be reclassified into earnings |  |  | 12 months |

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- Definition Estimated period for the anticipated transfer of gain (loss), net, from accumulated other comprehensive income into earnings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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