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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 26, 2018 | Dec. 27, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate swaps, net |  | $ 4,300 |
Investments |  | 1,709 | $ 0
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total, assets |  | 18,797 | 10,476
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, assets |  | 12,808 | 12,663
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total, assets |  | 5,989 |
Total, liabilities |  |  | (2,187)
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total, assets |  | 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 | [1] | 12,808 | 12,663
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 | [1] | 12,808 | 12,663
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 | [1] | 0 | 0
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 | [1] | 0 | 0
Recurring [Member] | Interest Rate Swap [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate swaps, net | [2] | 4,280 | (2,187)
Recurring [Member] | Interest Rate Swap [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, net | [2] | 0 | 0
Recurring [Member] | Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate swaps, net | [2] | 4,280 | (2,187)
Recurring [Member] | Interest Rate Swap [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate swaps, net | [2] | 0 | $ 0
Recurring [Member] | Securities (Assets) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [3] | 1,709 |
Recurring [Member] | Securities (Assets) [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] |  |  |
Investments | [3] | 0 |
Recurring [Member] | Securities (Assets) [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [3] | 1,709 |
Recurring [Member] | Securities (Assets) [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [3] | $ 0 |
[1] | The fair values of our deferred compensation plan investments are based on the closing market prices of the elected investments.
[2] | The fair values of our interest rate swaps 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 9 for details on the interest rate swaps.(3)The fair value of investments is valued
[3] | The fair value of investments is valued using a readily determinable net asset value per share based on the fair value of the underlying securities. There are no significant redemption restrictions associated with these investments.

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