Fair Value Measurement, Financial Instruments And Risk Management (Carrying And Fair Values Of Non-Current Financial Assets And Liabilities Not Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior secured notes, Carrying Amount	$ 107,407		$ 109,559
Senior Secured Credit Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior secured credit facility, Carrying Amount	40,064	[1]	42,021	[1]
Senior Secured Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior secured notes, Carrying Amount	66,114	[1]	66,114	[1]
Estimated Fair Value [Member] | Senior Secured Credit Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior secured credit facility, Estimated Fair Value	40,064	[1]	42,021	[1]
Estimated Fair Value [Member] | Senior Secured Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior secured notes, Estimated Fair Value	$ 66,524	[1]	$ 66,549	[1]

[1] The carrying amounts are reported on the balance sheet under the indicated captions.