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Schedule II Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Dec. 26, 2009
Allowance for doubtful receivables
      
Movement in Valuation and Qualifying Accounts      
Balance at beginning of period $ 8,406 $ 5,905 $ 5,269
Delta Acquisition   3,124  
Charged to profit and loss 1,627 939 932
Deductions from reserves (2,478) (1,562) (296)
Balance at close of period 7,555 8,406 5,905
Allowance for deferred income tax asset valuation
      
Movement in Valuation and Qualifying Accounts      
Balance at beginning of period 208,130 4,529 8,753
Delta Acquisition   204,470  
Charged to profit and loss (84,608) (869) (4,224)
Balance at close of period $ 123,522 $ 208,130 $ 4,529