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Employee Benefit Plans (Fair Values of Pension Plan Assets) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2015
Dec. 31, 2014
Dec. 25, 2013
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 58,378 $ 62,820 $ 61,094
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 58,378 61,267  
Significant Other Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1,553  
Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,777 1,812  
Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,777 1,812  
Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 0  
U.S. Large-Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]   7,154  
U.S. Large-Cap [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]   7,154  
U.S. Large-Cap [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]   0  
U.S. Large-Cap [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]   0  
U.S. Mid-Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2]   2,182  
U.S. Mid-Cap [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2]   2,182  
U.S. Mid-Cap [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2]   0  
U.S. Mid-Cap [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2]   0  
U.S. Small-Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3]   506  
U.S. Small-Cap [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3]   506  
U.S. Small-Cap [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3]   0  
U.S. Small-Cap [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3]   0  
International Large-Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   4,185  
International Large-Cap [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   4,185  
International Large-Cap [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
International Large-Cap [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Strategic target asset allocation 100.00%    
U.S. Treasuries [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 3,500 5,202  
U.S. Treasuries [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,500 5,202  
U.S. Treasuries [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. Treasuries [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Corporate Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 53,101 40,226  
Corporate Bonds [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 53,101 40,226  
Corporate Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 0 0  
Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] $ 0 0  
Commingled Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5]   1,553  
Commingled Funds [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5]   0  
Commingled Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5]   1,553  
Commingled Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5]   $ 0  
[1] The majority of this category represents a fund with the objective of approximating the return of the S&P 500 Index. The remaining securities include both a large-value fund and a large-growth fund investing in diverse industries.
[2] This category includes both a mid-growth fund with the objective of outperforming the Russell Mid Cap Growth Index and a mid-value fund investing in diverse industries.
[3] This category includes both a small-value fund and a small-growth fund investing in diverse industries.
[4] This category includes intermediate and long-term investment grade bonds from diverse industries.
[5] This category represents a fund of well diversified mutual funds with the objective of providing a low-volatility means to access equity-like returns.