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Closed Restaurant Reserve (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Jan. 01, 2013
Restructuring Reserve [Roll Forward]    
Closed restaurant reserves, beginning of period $ 788 $ 515
Additions—store closing costs recognized, accretion 80 483
Decreases—payments (285) (210)
Closed restaurant reserves, end of period $ 583 $ 788