Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Details)

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Derivative Financial Instruments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 12, 2015
USD ($)
Jul. 13, 2014
USD ($)
Jul. 12, 2015
USD ($)
Jul. 13, 2014
USD ($)
Jun. 30, 2015
USD ($)
Dec. 28, 2014
USD ($)
interest_rate_swap
Aug. 05, 2011
USD ($)
Interest Rate Swap | Rabobank              
Derivative and other comprehensive income              
Number of derivative instruments held | interest_rate_swap           1  
Estimated notional hedge amount on expiration date which is June 30, 2015         $ 50,600    
Fixed rate of interest on derivative (as a percent) 1.135%   1.135%        
Cash Flow Hedging              
Derivative and other comprehensive income              
Losses recognized in OCI on derivative (effective portion) $ 0 $ (7) $ (3) $ (78)      
Losses reclassified from AOCI into income (effective portion) $ (13) $ (22) $ (36) $ (51)      
Cash Flow Hedging | Interest Rate Swap | Rabobank              
Derivative and other comprehensive income              
Notional amount of derivatives           $ 54,400 $ 74,100