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Shareholders' Equity Shareholders' Equity (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 27, 2017 | Dec. 28, 2016 | Dec. 30, 2015
AOCI Attributable To Parent, Net Of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive loss, net of tax, beginning balance |  | $ (1,407) | $ (23,777) | $ (24,602)
Benefit obligation actuarial gain (loss) |  | (172) | (1,018) | 5,737
Net gain (loss) |  |  | 603 | (3,894)
Amortization of net loss | [1] | 92 | 85 | 1,812
Settlement loss recognized |  | 21 | 24,297 |
Net change in fair value of derivatives |  | (1,359) | 1,693 | (1,444)
Reclassification of derivatives to interest expense | [2] | (72) | (789) | (859)
Income tax benefit (expense) |  | 581 | (2,501) | (527)
Accumulated other comprehensive loss, net of tax, ending balance |  | (2,316) | (1,407) | (23,777)
Estimated reclassification from other comprehensive income to interest expense related to the interest rate swaps over the next 12 months |  | 1,300 |  |
Pensions [Member] |  |  |  |
AOCI Attributable To Parent, Net Of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive loss, net of tax, beginning balance |  | (945) | (22,764) | (24,994)
Benefit obligation actuarial gain (loss) |  | (172) | (1,018) | 5,737
Net gain (loss) |  |  | 603 | (3,894)
Amortization of net loss | [1] | 92 | 85 | 1,812
Settlement loss recognized |  | 21 | 24,297 |
Income tax benefit (expense) |  | 22 | (2,148) | (1,425)
Accumulated other comprehensive loss, net of tax, ending balance |  | (982) | (945) | (22,764)
Derivatives [Member] |  |  |  |
AOCI Attributable To Parent, Net Of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive loss, net of tax, beginning balance |  | (462) | (1,013) | 392
Net change in fair value of derivatives |  | (1,359) | 1,693 | (1,444)
Reclassification of derivatives to interest expense | [2] | (72) | (789) | (859)
Income tax benefit (expense) |  | 559 | (353) | 898
Accumulated other comprehensive loss, net of tax, ending balance |  | $ (1,334) | $ (462) | $ (1,013)
[1] | Before-tax amount that was reclassified from accumulated other comprehensive loss and included as a component of pension expense within general and administrative expenses in our Consolidated Statements of Income. See Note 11 for additional details.
[2] | Amounts reclassified from accumulated other comprehensive loss into income, represent payments made to the counterparty for the effective portions of the interest rate swaps. These amounts are included as a component of interest expense in our Consolidated Statements of Income. We expect to reclassify approximately $1.3 million from accumulated other comprehensive loss related to our interest rate swaps during the next twelve months. See Note 10 for additional 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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