Quarterly report pursuant to Section 13 or 15(d)

Deferred Gain (Details)

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Deferred Gain (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Sep. 25, 2009
Deferred Revenue Disclosure [Abstract]        
Deferred gain of sale-leaseback transaction       $ 2,436
Initial lease period for amortization of deferred gain (in years)   5 years    
Amortization of deferred gain $ 122 $ 243 $ 244