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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 26, 2012
Dec. 28, 2011
Dec. 29, 2010
Components of net periodic benefit cost [Abstract]      
Net periodic benefit cost $ 1,500 $ 700 $ 1,000
Pension Plan [Member]
      
Components of net periodic benefit cost [Abstract]      
Service cost 380 335 375
Interest cost 3,200 3,364 3,431
Expected return on plan assets (4,057) (4,182) (3,928)
Amortization of net loss 1,763 1,004 915
Net periodic benefit cost 1,286 521 793
Other comprehensive loss 202 8,997 1,050
Other Defined Benefit Plans [Member]
      
Components of net periodic benefit cost [Abstract]      
Service cost 0 0  
Interest cost 116 127 138
Amortization of net loss 52 32 22
Net periodic benefit cost 168 159 160
Other comprehensive loss $ 175 $ 232 $ 103