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Shareholders' Equity (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2018 | Sep. 27, 2017 | Sep. 26, 2018 | Sep. 27, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance as of December 27, 2017, defined benefit plans |  |  |  | $ (982) |
Balance as of December 27, 2017, derivatives |  |  |  | (1,334) |
Balance as of December 27, 2017 |  |  |  | (2,316) |
Amortization of net loss | [1] |  |  | 84 |
Net change in fair value of derivatives |  |  |  | 6,225 |
Reclassification of derivatives to interest expense, net | [2] |  |  | (241) |
Income tax (expense) benefit related to defined benefit plans |  | $ (7) | $ (9) | (20) | $ (27)
Income tax (expense) benefit related to derivatives |  | 1,583 | $ 133 | 1,673 | $ (1,249)
Income tax (expense) benefit related to items of other comprehensive loss |  |  |  | 1,693 |
Balance as of September 26, 2018, defined benefit plans |  | (918) |  | (918) |
Balance as of September 26, 2018, derivatives |  | 3,459 |  | 3,459 |
Balance as of September 26, 2018 |  | $ 2,541 |  | 2,541 |
Estimated reclassification from accumulated other comprehensive income to interest expense related to the interest rate swaps over the next 12 months |  |  |  | $ 600 |
[1] | Before-tax amount related to our defined benefit plans that was reclassified from accumulated other comprehensive loss and included as a component of pension expense within general and administrative expenses in our Condensed Consolidated Statements of Income during the three quarters ended September 26, 2018.
[2] | Amounts reclassified from accumulated other comprehensive loss into income represent payments either received from or made to the counterparty for the effective portions of the interest rate swaps. These amounts are included as a component of interest expense, net in our Condensed Consolidated Statements of Income. We expect to make payments to the counterparty and reclassify approximately $0.6 million from accumulated other comprehensive loss related to our interest rate swaps during the next twelve months. See Note 9 for additional details.

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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