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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 24, 2014 | Dec. 25, 2013
Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total | $ 10,734 |  | $ 11,211 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total | 8,880 |  | 8,168 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total | 1,854 |  | 3,043 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total | 0 |  | 0 |
Recurring [Member] | Deferred compensation plan investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation plan investments | 8,880 | [1] | 8,168 | [1]
Valuation technique | market approach |  | market approach |
Recurring [Member] | Deferred compensation plan investments [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation plan investments | 8,880 | [1] | 8,168 | [1]
Recurring [Member] | Deferred compensation plan investments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation plan investments | 0 | [1] | 0 | [1]
Recurring [Member] | Deferred compensation plan investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation plan investments | 0 | [1] | 0 | [1]
Recurring [Member] | Interest rate swaps [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps and interest rate caps | 1,854 | [2] | 3,032 | [2]
Valuation technique | income approach |  | income approach |
Recurring [Member] | Interest rate swaps [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps and interest rate caps | 0 | [2] | 0 | [2]
Recurring [Member] | Interest rate swaps [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps and interest rate caps | 1,854 | [2] | 3,032 | [2]
Recurring [Member] | Interest rate swaps [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps and interest rate caps | 0 | [2] | 0 | [2]
Recurring [Member] | Interest rate caps [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps and interest rate caps | 0 | [2] | 11 | [2]
Valuation technique | income approach |  | income approach |
Recurring [Member] | Interest rate caps [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps and interest rate caps | 0 | [2] | 0 | [2]
Recurring [Member] | Interest rate caps [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps and interest rate caps | 0 | [2] | 11 | [2]
Recurring [Member] | Interest rate caps [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps and interest rate caps | 0 | [2] | 0 | [2]
Nonrecurring [Member] | Assets held and used [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment of long-lived assets held-for-use | 320 |  | 4,795 |
Valuation technique | income approach |  | income approach |
Nonrecurring [Member] | Assets held and used [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets held and used | $ 0 |  | $ 1,198 |
[1] | The fair values of our deferred compensation plan investments are based on the closing market prices of the participants’ elected investments.
[2] | The fair values of our interest rate swaps and interest rate caps are based upon Level 2 inputs, which include valuation models as reported by our counterparties. The key inputs for the valuation models are quoted market prices, interest rates and forward yield curves. See Note 7 for details on the interest rate swaps and interest rate caps.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + 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=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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