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Defined Benefit Plans (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 25, 2013
Dec. 26, 2012
Sep. 25, 2013
Pension Plan [Member]
Sep. 26, 2012
Pension Plan [Member]
Sep. 25, 2013
Pension Plan [Member]
Sep. 26, 2012
Pension Plan [Member]
Sep. 25, 2013
Other Defined Benefit Plans [Member]
Sep. 26, 2012
Other Defined Benefit Plans [Member]
Sep. 25, 2013
Other Defined Benefit Plans [Member]
Sep. 26, 2012
Other Defined Benefit Plans [Member]
Components of net periodic benefit cost [Abstract]                    
Service cost     $ 100,000 $ 95,000 $ 300,000 $ 285,000        
Interest cost     745,000 800,000 2,233,000 2,400,000 28,000 29,000 84,000 87,000
Expected return on plan assets     (1,122,000) (1,024,000) (3,366,000) (3,042,000)        
Amortization of net loss     413,000 441,000 1,240,000 1,322,000 17,000 13,000 53,000 39,000
Net periodic benefit cost     136,000 312,000 407,000 965,000 45,000 42,000 137,000 126,000
Contributions made to qualified pension plan and other defined benefit plans         2,800,000 2,800,000     100,000 100,000
Maximum expected additional contributions to be made to qualified pension plan and other defined benefit plans                 100,000  
Reclassification from accumulated other comprehensive income current period, net of tax         800,000          
Additional minimum pension liability $ 24,200,000 $ 25,000,000